Winding device and winding system

Abstract

The utility model discloses a winding device (10) and a winding system. The winding device (10) comprises a winding needle (101) and a first push rod (102). The first needle body (1011) and the second needle body (1012) form a first hole (1015) at the first end (1013), at least part of the first hole (1015) is a first adjusting hole section (10151), and the radial size of the first adjusting hole section (10151) is gradually reduced in the direction close to the second end (1014). The first push rod (102) is inserted into the first hole (1015) and can reciprocate in the axial direction of the winding needle (101), and the first push rod (102) is provided with a first adjusting section (1021) matched with the first adjusting hole section (10151). The winding device (10) can adjust the circumference of the winding needle (101) so as to reduce the tab dislocation amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to a winding device, a winding system and a winding method. BACKGROUND

[0002] In the battery production process, the winding device is a device for winding the positive electrode sheet, the separator and the negative electrode sheet together to form an electrode assembly. However, during the winding operation of the winding device, as the number of winding turns increases, factors such as the thickness change of the positive electrode sheet, the thickness change of the negative electrode sheet, and the thickness change of the separator are likely to cause the formed electrode assembly to have a tab misalignment phenomenon, thereby resulting in a high rate of defective and scrapped electrode assemblies. SUMMARY

[0003] The embodiments of the present application provide a winding device, a winding system and a winding method, which are aimed at solving the problem that the existing winding device is prone to cause the formed electrode assembly to have a tab misalignment phenomenon, thereby resulting in a high rate of defective and scrapped electrode assemblies.

[0004] The technical solutions adopted by the embodiments of the present application are as follows:

[0005] In a first aspect, a winding device is provided, wherein the winding device comprises:

[0006] The winding needle comprises a first needle body and a second needle body that are parallel to each other and have an adjustable distance. The winding needle has opposite first and second ends. The first needle body and the second needle body jointly form a first hole at the first end. At least a part of the first hole is a first adjustment hole section. The radial dimension of the first adjustment hole section is gradually reduced in the direction close to the second end.

[0007] The first push rod is inserted into the first hole and can reciprocate along the axial direction of the winding needle. The first push rod has a first adjustment section that matches the first adjustment hole section.

[0008] The winding device provided by the embodiments of the present application can, when the ear dislocation phenomenon of the last electrode assembly wound by the winding device is found, adjust the spacing between the first needle body and the second needle body, adjust the circumference of the winding needle, and then continue to wind the next electrode assembly by the winding device with the adjusted circumference of the winding needle, so as to adjust the position of the ear of the next electrode assembly, reduce the ear dislocation amount, and even eliminate the ear dislocation phenomenon, thereby effectively improving the qualified rate of the electrode assembly wound by the winding device, effectively reducing the defective rate and the scrap rate of the electrode assembly wound by the winding device, effectively improving the production efficiency and product quality of the batch production of the electrode assembly, and effectively reducing the cost of the batch production of the electrode assembly.

[0009] The winding device provided by the embodiments of the present application can, after winding the electrode assembly, first pull out the first push rod from the first hole to preliminarily reduce the spacing between the first needle body and the second needle body, thereby reducing the radial dimension of the winding needle and reducing the contact stress between the winding needle and the electrode assembly, so as to conveniently reduce the risk of subsequent needle pulling failure. On this basis, the first needle body and the second needle body are pulled out from the electrode assembly in turn, so as to reduce the damage and scrap of the electrode assembly, and realize the needle pulling operation, so as to facilitate the separation of the electrode assembly from the winding needle and the subsequent process of the electrode assembly.

[0010] In some embodiments, the width of the first adjusting section gradually decreases in the direction close to the second end.

[0011] By adopting the above scheme, the different width regions of the first adjusting section can be contacted and matched with the different radial dimension regions of the first adjusting hole section by controlling the movement of the first adjusting section relative to the first adjusting hole section, so as to adjust the pushing effect of the first adjusting section on the first needle body and the second needle body, adjust the spacing between the first needle body and the second needle body, and adjust the circumference of the winding needle. Moreover, based on the data variation trend of the radial dimension of the first adjusting hole section along the axial direction of the winding needle and the data variation trend of the width of the first adjusting section along the axial direction of the winding needle, the relationship between the movement stroke of the first adjusting section along the axial direction of the winding needle and the spacing between the first needle body and the second needle body, and the relationship between the movement stroke of the first adjusting section along the axial direction of the winding needle and the circumference of the winding needle can be estimated, so as to conveniently and accurately adjust the spacing between the first needle body and the second needle body and the circumference of the winding needle by controlling the movement stroke of the first adjusting section along the axial direction of the winding needle, thereby facilitating the adjustment accuracy.

[0012] In some embodiments, the winding device further comprises:

[0013] a first support arranged at the first end and fastened to a side of the first needle body away from the second needle body;

[0014] a second support arranged at the first end and fastened to a side of the second needle body away from the first needle body.

[0015] By adopting the above scheme, the first needle body can be supported at the first end by the first support fastened to the side of the first needle body away from the second needle body, so as to enhance the structural strength of the first needle body and reduce the risk of bending and breaking of the first needle body during needle pulling, needle inserting and winding. Similarly, the second needle body can be supported at the first end by the second support fastened to the side of the second needle body away from the first needle body, so as to enhance the structural strength of the second needle body and reduce the risk of bending and breaking of the second needle body during needle pulling, needle inserting and winding. Thus, the service life of the needle winding device and the winding needle can be effectively guaranteed and prolonged.

[0016] In some embodiments, the winding device further comprises a first support seat arranged at the first end and sleeved around the first support and the second support.

[0017] The winding device further comprises a first elastic member arranged between the first support seat and the first support, and / or a second elastic member arranged between the first support seat and the second support.

[0018] By adopting the above scheme, the first support, the second support, the first end of the first needle body and the first end of the second needle body can be reliably supported by the first support seat, so as to stabilize the position of the first end of the winding needle. Based on this, the rotation axis of the winding needle can be stabilized, so that the winding needle can be smoothly rotated and the winding operation of the winding needle can be smoothly performed.

[0019] On this basis, the first elastic member elastically abuts between the first support base and the first support bracket, and when the first push rod is inserted into the first hole and changes the distance between the first needle body and the second needle body, the first elastic member can elastically abut against the first needle body to stabilize the state of the first needle body. And / or, the second elastic member elastically abuts between the second support base and the second support bracket, and when the first push rod is inserted into the first hole and changes the distance between the first needle body and the second needle body, the second elastic member can elastically abut against the second needle body to stabilize the state of the second needle body. Thus, the first elastic member and / or the second elastic member can jointly press the winder to reduce the risk of the winder jumping during the change of the circumference of the winder, thereby promoting the stability of the winder, enabling the winder to rotate smoothly and perform winding work smoothly with the adjusted circumference, thereby effectively reducing the risk of the electrode assembly formed by winding having quality problems due to the jumping of the winder, and effectively improving the yield of the electrode assembly formed by the winding device.

[0020] In some embodiments, the winding device further comprises:

[0021] The first driver is connected to the end of the first push rod away from the winder, and is used to drive the first push rod to reciprocate along the axial direction of the winder.

[0022] By adopting the above scheme, the first push rod can be driven by the first driver to reciprocate along the axial direction of the winder, so as to control the insertion or extraction of the first push rod into or out of the first hole in a time-saving, labor-saving, convenient and fast manner, and the movement stroke of the first push rod in the first hole can be accurately controlled, thereby facilitating the adjustment convenience and accuracy of the circumference of the winder.

[0023] In some embodiments, the first hole comprises a first through hole section, a first adjustment hole section and a first containing hole section which are sequentially communicated in the direction close to the second end.

[0024] The first push rod has a first main body section and a first adjustment section provided at the end of the first main body section, and part of the first main body section is arranged in the first through hole section.

[0025] By adopting the above scheme, the first push rod can concentrate the function of adjusting the distance between the first needle body and the second needle body at the end thereof by arranging the first adjusting segment at the end of the first main segment. Therefore, the first adjusting segment can be inserted into the first hole before other parts of the first push rod, and the first adjusting segment can be pulled out of the first hole after other parts of the first push rod. Thus, the influence of other parts of the first push rod on the distance between the first needle body and the second needle body can be effectively reduced, and the distance between the first needle body and the second needle body can be mainly controlled by the cooperation between the first adjusting segment and the first adjusting hole segment. Correspondingly, the first hole can accommodate the part of the first main segment inserted into the first hole through the first through hole segment, and can accommodate the part of the first adjusting segment passing through the first adjusting hole segment through the first accommodating hole segment. Thus, the influence of the part of the first main segment inserted into the first hole on the distance between the first needle body and the second needle body can be effectively reduced, and the influence of the part of the first adjusting segment passing through the first adjusting hole segment on the distance between the first needle body and the second needle body can be effectively reduced. The distance between the first needle body and the second needle body can be mainly controlled by the cooperation between the first adjusting segment and the first adjusting hole segment. Thus, the influencing factors of the distance between the first needle body and the second needle body can be reduced, and the adjustment accuracy can be improved.

[0026] In some embodiments, the first adjusting segment is a wedge-shaped structure, and the first adjusting hole segment is a wedge-shaped hole.

[0027] By adopting the above scheme, the first adjusting segment and the first adjusting hole segment can be wedge-shaped cooperated. Thus, the distance between the first needle body and the second needle body can be accurately adjusted by adjusting the cooperation position of the first adjusting segment and the first adjusting hole segment, and the circumference of the winding needle can be accurately adjusted. Since the first adjusting segment and the first adjusting hole segment can form a surface contact, the contact between the first adjusting segment and the first adjusting hole segment can be smooth, the distance between the first needle body and the second needle body can change smoothly and stably, and the winding needle can rotate smoothly and stably at the adjusted circumference to perform winding work. Thus, the risk of poor quality of the electrode assembly caused by the change of the circumference of the winding needle during the winding work can be effectively reduced, and the qualified rate of the electrode assembly wound by the winding device can be effectively improved.

[0028] In some embodiments, the first needle body and the second needle body jointly form a second hole at the second end, at least a part of the second hole is a second adjusting hole segment, and the radial dimension of the second adjusting hole segment is gradually reduced in the direction close to the first end. The winding device further comprises:

[0029] A second push rod is inserted into the second hole and can reciprocate along the axial direction of the winding needle. The second push rod has a second adjusting segment cooperated with the second adjusting hole segment.

[0030] By adopting the above scheme, the second push rod can be inserted and pulled out at the second end of the winding needle to adjust the distance between the first needle body and the second needle body based on the first push rod being inserted and pulled out at the first end of the winding needle to adjust the distance between the first needle body and the second needle body. Thus, the first push rod and the second push rod can jointly adjust the distance between the first needle body and the second needle body, and the circumference of the winding needle. The adjustment amount of the second push rod at the second end of the winding needle can be consistent with the adjustment amount of the first push rod at the first end of the winding needle. Thus, the winding needle can be wound to form an electrode assembly with a consistent circumference, which can effectively reduce the risk of poor quality of the electrode assembly due to inconsistent adjustment amounts of the circumference, and can effectively improve the yield of the electrode assembly wound by the winding device.

[0031] In some embodiments, the width of the second adjusting section is tapered in the direction close to the first end.

[0032] By adopting the above scheme, the second adjusting section can be moved relative to the second adjusting hole section to adjust the contact between the different width regions of the second adjusting section and the different radial size regions of the second adjusting hole section, so as to adjust the pushing effect of the second adjusting section on the first needle body and the second needle body, adjust the distance between the first needle body and the second needle body, and adjust the circumference of the winding needle. Based on the data variation trend of the radial size of the second adjusting hole section along the axial direction of the winding needle and the data variation trend of the width of the second adjusting section along the axial direction of the winding needle, the relationship between the movement stroke of the second adjusting section along the axial direction of the winding needle and the distance between the first needle body and the second needle body, and the relationship between the movement stroke of the second adjusting section along the axial direction of the winding needle and the circumference of the winding needle can be estimated. Thus, the distance between the first needle body and the second needle body and the circumference of the winding needle can be accurately adjusted by controlling the movement stroke of the second adjusting section along the axial direction of the winding needle, which can improve the adjustment accuracy.

[0033] In some embodiments, the winding device further comprises:

[0034] The second support seat is provided with a third hole on the side close to the winding needle, and the bottom of the third hole is provided with a fourth hole penetrating through the third hole. The second end of the winding needle is inserted into the third hole, and the second push rod is inserted into the fourth hole.

[0035] By adopting the above scheme, the second support seat can reliably support the second end of the first needle body and the second end of the second needle body to stabilize the position of the second end of the winding needle. Thus, the rotation axis of the winding needle can be stabilized, which can facilitate smooth rotation of the winding needle and smooth winding operation of the winding needle. The second support seat can also support and position the second push rod to facilitate accurate insertion and pulling of the second push rod into the second hole.

[0036] In some embodiments, the winding device further comprises:

[0037] A third elastic member is installed in the third hole and sleeved on the outer periphery of the second end of the winding needle.

[0038] By adopting the above scheme, when the second end of the winding needle is inserted into the third hole, the third elastic member elastically abuts between the hole wall of the third hole and the second end of the winding needle. Based on this, when the second push rod is inserted into the second hole and the spacing between the first needle body and the second needle body changes, the third elastic member can elastically press against the second end of the winding needle to stabilize the state of the second end of the winding needle. Thus, the risk of the winding needle jumping during the change of its circumference can be effectively reduced, so as to stabilize the winding needle and enable the winding needle to smoothly rotate and perform winding work with the adjusted circumference, thereby effectively reducing the risk of the electrode assembly formed by winding having quality problems due to the jumping of the winding needle, and effectively improving the yield of the electrode assembly formed by the winding device. Moreover, by installing the third elastic member in the third hole, the insertion resistance of the second end of the winding needle can be effectively reduced during the insertion of the second end of the winding needle into the third hole by the elastic deformation of the third elastic member.

[0039] In some embodiments, the winding device further comprises:

[0040] A second driver is connected to the end of the second push rod away from the winding needle, and is used to drive the second push rod to reciprocate along the axial direction of the winding needle.

[0041] By adopting the above scheme, the second push rod can be driven by the second driver to reciprocate along the axial direction of the winding needle, so as to time-savingly, labor-savingly, conveniently and quickly control the insertion or extraction of the second push rod into or out of the second hole, and the movement stroke of the second push rod in the second hole can be accurately controlled, thereby facilitating the adjustment convenience and accuracy of the circumference of the winding needle.

[0042] In some embodiments, the second hole comprises a second through hole section, a second adjusting hole section and a second accommodating hole section which are sequentially communicated in the direction close to the first end.

[0043] The second push rod has a second main body section and a second adjusting section provided at the end of the second main body section, and part of the second main body section is inserted into the second through hole section.

[0044] By adopting the above scheme, the second push rod can be inserted into the second hole by arranging the second adjusting segment at the end of the second main body segment, so that the function part of the second push rod for adjusting the distance between the first needle body and the second needle body is concentrated at the end thereof, based on which, the second adjusting segment can be inserted into the second hole prior to other parts of the second push rod, the second adjusting segment can be pulled out of the second hole after the other parts of the second push rod, so that the influence of the other parts of the second push rod on the distance between the first needle body and the second needle body can be effectively reduced, and the change of the distance between the first needle body and the second needle body at the second end can be mainly controlled by the cooperation between the second adjusting segment and the second adjusting hole segment. Correspondingly, the second hole can accommodate the part of the second main body segment inserted into the second hole through the second through hole segment, and accommodate the part of the second adjusting segment passing through the second adjusting hole segment through the second accommodating hole segment, so that the influence of the part of the second main body segment inserted into the second hole on the distance between the first needle body and the second needle body can be effectively reduced, the influence of the part of the second adjusting segment passing through the second adjusting hole segment on the distance between the first needle body and the second needle body can be effectively reduced, and the change of the distance between the first needle body and the second needle body at the second end can be mainly controlled by the cooperation between the second adjusting segment and the second adjusting hole segment. Thus, the influencing factors of the change of the distance between the first needle body and the second needle body can be reduced, and the adjustment accuracy can be improved.

[0045] In some embodiments, the second adjusting segment is a wedge-shaped structure, and the second adjusting hole segment is a wedge-shaped hole, and the second adjusting segment is wedge-shaped cooperated with the second adjusting hole segment.

[0046] By adopting the above scheme, the second adjusting segment and the second adjusting hole segment can be wedge-shaped cooperated, so that the distance between the first needle body and the second needle body can be accurately adjusted and the circumference of the needle reel can be accurately adjusted by adjusting the cooperation position of the second adjusting segment and the second adjusting hole segment. Moreover, since the second adjusting segment and the second adjusting hole segment can form a surface contact, the contact between the second adjusting segment and the second adjusting hole segment can be smooth, the distance between the first needle body and the second needle body can change smoothly and can be kept stable after adjustment, so that the needle reel can rotate smoothly and perform winding operation smoothly at the adjusted circumference, the risk of the electrode assembly formed by winding having quality problems due to the change of the circumference of the needle reel during winding operation can be effectively reduced, and the qualified rate of the electrode assembly formed by the winding device can be effectively improved.

[0047] In a second aspect, a winding system is provided, which comprises the winding device provided in the embodiments of the present application.

[0048] By adopting the above scheme, the winding system can wind the electrode assembly by the winding device provided in the embodiments of the present application, and when it is found that the last electrode assembly wound by the winding device has the tab misplacement phenomenon, the length of the winding needle of the winding device can be adjusted according to the tab misplacement amount of the last electrode assembly, and the next electrode assembly can be continuously wound by the adjusted winding device, so as to reduce the tab misplacement amount or even eliminate the tab misplacement phenomenon, thereby effectively improving the production efficiency and product quality of the winding operation and effectively reducing the cost loss of the winding operation.

[0049] In some embodiments, the winding system is configured to wind a first electrode tab, a separator, and a second electrode tab to form an electrode assembly, and the winding system further comprises a first detection device configured to detect a tab of the first electrode tab and / or a tab of the second electrode tab.

[0050] By adopting the above scheme, the first detection device can be used to identify and detect the tab of the first electrode tab to determine whether the first electrode tab has the tab misplacement phenomenon, and / or identify and detect the tab of the second electrode tab to determine whether the second electrode tab has the tab misplacement phenomenon. Based on this, the tab misplacement amount of the current electrode assembly can be detected in real time during the winding of the electrode assembly by the winding device, so that the length of the winding needle can be adjusted according to the tab misplacement amount of the last electrode assembly by the subsequent winding device to wind the next electrode assembly, thereby timely adjusting the tab misplacement amount of the next electrode assembly, effectively improving the production efficiency and product quality of the winding operation, and effectively reducing the cost loss of the winding operation.

[0051] In a third aspect, a winding method is provided, wherein the winding method is implemented by the winding device provided in the embodiments of the present application, and the winding method comprises the following steps:

[0052] winding a first positive electrode tab, a first separator, and a first negative electrode tab to form a first electrode assembly by the winding device, and obtaining a misplacement amount of a test tab, the test tab being at least part of a tab on the first positive electrode tab and / or the first negative electrode tab;

[0053] obtaining an adjustment amount of the length of the winding needle according to the misplacement amount;

[0054] adjusting the distance between the first needle body and the second needle body according to the adjustment amount;

[0055] winding a second positive electrode tab, a second separator, and a second negative electrode tab to form a second electrode assembly by the winding device after the distance is adjusted.

[0056] By adopting the above scheme, the displacement amount of the test tab can be measured in real time when the first electrode assembly is wound by the winding device, and the adjustment amount of the circumference of the winding needle can be obtained according to the displacement amount of the test tab. Based on this, when it is found that the first electrode assembly wound by the winding device has the tab displacement phenomenon, the winding device can adjust the distance between the first needle body and the second needle body according to the adjustment amount of the circumference of the winding needle after completing the winding work of the first electrode assembly and before starting the winding work of the second electrode assembly, so as to adjust the circumference of the winding needle, and then the winding device continues to wind the second electrode assembly by the winding needle with the adjusted circumference, so as to adjust the position of the tab of the second electrode assembly and reduce or even eliminate the tab displacement amount. Therefore, the tab displacement of the electrode assembly can be adjusted by a direct, effective, convenient and fast method, the qualified rate of the electrode assembly wound by the winding device can be effectively improved, the failure rate and the scrap rate of the electrode assembly wound by the winding device can be effectively reduced, the production efficiency and the product quality of the batch production of the electrode assembly can be effectively improved, and the cost of the batch production of the electrode assembly can be effectively reduced.

[0057] In some embodiments, the step of obtaining the displacement amount of the test tab comprises:

[0058] obtaining a test angle value of the test tab corresponding to the test tab, the test angle value being an angle value of the winding needle from the timing zero point to the detection of the test tab passing through the tab detection device;

[0059] comparing the test angle value of the test tab with a corresponding reference angle value to obtain an angle difference value of the test tab, the reference angle value being an angle value of the winding needle from the timing zero point to the detection of the position standard tab passing through the tab detection device;

[0060] obtaining the displacement amount of the test tab according to the angle difference value.

[0061] By adopting the above scheme, during the winding of the first electrode assembly by the winding device, the angle value of the winding needle from the timing zero point to the current time can be recorded as the test angle value each time the tab detection device identifies and detects the test tab, so as to obtain the displacement amount of the test tab according to the angle difference value between the test angle value and the reference angle value. Therefore, the displacement amount of the test tab can be obtained by a direct, effective, convenient and fast method, and the winding needle can be adjusted according to the displacement amount.

[0062] In some embodiments, in the step of obtaining the displacement amount of the test tab according to the angle difference value, the ratio of the angle difference value to 360° is obtained according to the angle difference value corresponding to the test tab, and then the ratio is multiplied by the circumference of the layer where the test tab is located to obtain the displacement amount corresponding to the test tab.

[0063] By adopting the above scheme, the dislocation amount corresponding to the test tab can be measured relatively accurately in a direct and quantitative manner based on the angle difference, so that the subsequent winding needle can adjust the circumference according to the accurate and quantitative dislocation amount.

[0064] In some embodiments, in the step of obtaining the adjustment amount of the circumference of the winding needle according to the dislocation amount, the dislocation amount of the test tab is divided by the number of the circle layer where the test tab is located to obtain an average dislocation amount, and then the average dislocation amount is multiplied by an adjustment coefficient to obtain the adjustment amount of the circumference of the winding needle.

[0065] By adopting the above scheme, the adjustment amount of the circumference of the winding needle can be obtained based on the dislocation amount of the test tab in a direct, effective, quantifiable, and continuously optimized manner according to the on-site situation, so that the subsequent winding needle can adjust the circumference according to the calculated adjustment amount, and the adjustment of the circumference of the winding needle can be continuously optimized according to the tab dislocation of the electrode assembly wound by the adjusted winding needle, so as to gradually reduce the tab dislocation. BRIEF DESCRIPTION OF DRAWINGS

[0066] In order to clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical description of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0067] Figure 1 The structural schematic diagram of the battery provided by the embodiments of the present application is shown in the following figure:

[0068] Figure 2 The structural schematic diagram of the winding device provided by the embodiments of the present application is shown in the following figure:

[0069] Figure 3 The partial structural exploded view of the winding device provided by the embodiments of the present application is shown in the following figure: Figure 2

[0070] The partial structural top view of the winding device provided by the embodiments of the present application is shown in the following figure: Figure 4 Figure 2 The sectional view along A-A of the winding device provided by the embodiments of the present application is shown in the following figure:

[0071] Figure 5 Figure 4 The enlarged view of the D area of the winding device provided by the embodiments of the present application is shown in the following figure:

[0072] Figure 6 The enlarged view of the E area of the winding device provided by the embodiments of the present application is shown in the following figure: Figure 5

[0073] Figure 7 Figure 5

[0074] ​​​​​Figure 8 provided in the cross-sectional view along B-B; Figure 4 provided in the cross-sectional view along B-B;

[0075] Figure 9 provided in the cross-sectional view along B-B; Figure 4 provided in the cross-sectional view along C-C;

[0076] Figure 10 provided in the cross-sectional view along C-C;

[0077] Figure 11 provided in the cross-sectional view along C-C;

[0078] Figure 12 provided in the cross-sectional view along C-C;

[0079] In the drawings:

[0080] 1-battery, 11-housing, 12-electrode assembly, 121-main body, 122-positive tab, 123-negative tab, 13-current collector;

[0081] 10-winding device, 101-winding needle, 1011-first needle body, 1012-second needle body, 1013-first end, 1014-second end, 1015-first hole, 10151-first adjusting hole section, 10152-first through hole section, 10153-first accommodating hole section, 1016-second hole, 10161-second adjusting hole section, 10162-second through hole section, 10163-second accommodating hole section; 102-first push rod, 1021-first adjusting section, 1022-first main body section; 103-first support; 104-second support; 105-first support seat; 106-first elastic member; 107-second elastic member; 108-first driver; 109-second push rod, 1091-second adjusting section, 1092-second main body section; 110-second support seat, 1101-third hole, 1102-fourth hole; 111-third elastic member; 112-second driver;

[0082] 20-first electrode tab, 30-second electrode tab, 40-separator; 50-unwinding device; 60-first detection device; 70-second detection device. DETAILED DESCRIPTION

[0083] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clear, the present application will be described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0084] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0085] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0086] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0087] In the present application, the battery can be the smallest unit that stores and outputs electric energy, i.e. battery monomer; it can also be a modular structure including one or more battery monomers to provide higher voltage and capacity, such as battery module or battery pack; the present application does not limit this. Among them, the battery monomer can be a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc.; the battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.; the battery monomer can adopt different packaging methods to form cylindrical battery monomers, square battery monomers or soft package battery monomers, etc.; the present application does not limit this.

[0088] As shown in Figure 1 The battery 1 generally includes a housing 11, an electrode assembly 12, a current collector 13 and the like. Among them, the housing 11 is a component for forming the internal environment of the battery 1, and the inside of the housing 11 forms a receiving space for receiving the electrode assembly 12 and the like.

[0089] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery 1. The electrode assembly 12 is processed in a winding manner by a positive electrode tab, a negative electrode tab, and a separator disposed between the positive electrode tab and the negative electrode tab. Specifically, in the processing of the electrode assembly 12, the positive electrode tab, the separator, and the negative electrode tab can be wound together by the winding device 10 to form a pre-shaped (e.g., circular) electrode assembly 12, the pre-shaped electrode assembly 12 can be gripped from the winding device 10 by the gripper needle device and transferred to the pre-pressing device, and finally, the pre-shaped electrode assembly 12 can be pre-pressed into a shaped, flat (e.g., square) electrode assembly 12 by the pre-pressing device on the basis of the gripper needle device stretching the electrode assembly 12.

[0090] In the electrode assembly 12, the portions having active materials of both the positive electrode tab and the negative electrode tab constitute a main body portion 121 of the electrode assembly 12, and the portions not having active materials of both the positive electrode tab and the negative electrode tab each constitute a tab, which is a current transmission end of the electrode assembly 12, for transmitting a current. The tabs of the positive electrode tab are positive electrode tabs 122, and the tabs of the negative electrode tab are negative electrode tabs 123, which can be located together at one end of the main body portion 121 or respectively at both ends of the main body portion 121.

[0091] The current collector 13 is disposed at the side of the electrode assembly 12 provided with the tabs and is a component for fixing the tabs of the electrode assembly 12 together to serve as a power lead-out end of the electrode assembly 12.

[0092] Ideally, the positive electrode tabs 122 of the electrode assembly 12 are aligned with each other and connected to the corresponding current collector 13, and the negative electrode tabs 123 of the electrode assembly 12 are aligned with each other and connected to the corresponding current collector 13.

[0093] However, during the winding operation of the winding device, as the number of winding turns increases, factors such as changes in the thickness of the positive electrode tab, changes in the thickness of the negative electrode tab, changes in the thickness of the separator, and the like can easily cause the tabs on the tabs to enter the winding device to be ahead of time or lag behind, resulting in tab misalignment in the electrode assembly 12 finally wound, i.e., poor tab alignment, thereby making it difficult for the tabs to be aligned with each other and connected to the corresponding current collector 13, and resulting in a high rate of defective and scrapped electrode assemblies 12 formed by winding.

[0094] Thus, some embodiments of the present application provide a winding device, which can, when the ear misalignment phenomenon occurs in the last electrode assembly wound by the winding device is found, adjust the position of the ears of the next electrode assembly to be wound by the winding device by adjusting the spacing between the first needle body and the second needle body, adjusting the circumference of the winding needle, and then continuing to wind the next electrode assembly by the winding device with the adjusted winding needle, so as to reduce the ear misalignment amount, or even eliminate the ear misalignment phenomenon, thereby effectively improving the yield of the electrode assembly wound by the winding device, effectively reducing the defective rate and the scrap rate of the electrode assembly wound by the winding device, effectively improving the production efficiency and product quality of the batch production of the electrode assembly, and effectively reducing the cost of the batch production of the electrode assembly.

[0095] In order to illustrate the technical solutions provided by the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0096] Please refer to Figure 2 , Figure 3 Some embodiments of the present application provide a winding device 10. Please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , the winding device 10 comprises a winding needle 101 and a first push rod 102. The winding needle 101 comprises a first needle body 1011 and a second needle body 1012 which are parallel to each other and have an adjustable spacing, and the winding needle 101 has opposite first and second ends 1013 and 1014. The first needle body 1011 and the second needle body 1012 together form a first hole 1015 at the first end 1013, and at least a part of the first hole 1015 is a first adjustment hole segment 10151, and the radial dimension of the first adjustment hole segment 10151 gradually decreases in the direction close to the second end 1014. The first push rod 102 is inserted into the first hole 1015 and can reciprocate along the axial direction of the winding needle 101, and the first push rod 102 has a first adjustment segment 1021 which cooperates with the first adjustment hole segment 10151.

[0097] It should be noted that please refer to Figure 1The winding needle 101 is a component for assisting the winding forming of the electrode assembly 12. The winding needle 101 is connected with a driving mechanism (not shown in the figure), and the winding needle 101 can rotate around the axis thereof under the driving of the driving device, so as to realize the winding of the positive electrode sheet, the diaphragm and the negative electrode sheet to form the electrode assembly 12. The shape of the winding needle 101 is not limited in the embodiment, for example, it can be a rhombic winding needle, an elliptical winding needle, a circular winding needle and the like.

[0098] The winding needle 101 is divided into a first needle body 1011 and a second needle body 1012 along the longitudinal section (i.e. the section parallel to the axial direction of the winding needle 101) thereof. The first needle body 1011 and the second needle body 1012 are independently formed needle-shaped or columnar or strip-shaped solid structures. The shape, size and material of the first needle body 1011 and the second needle body 1012 are not limited in the embodiment. The first needle body 1011 and the second needle body 1012 are oppositely arranged along the radial direction of the winding needle 101, and are parallel to each other. The first needle body 1011 and the second needle body 1012 have a spacing therebetween, and the spacing is adjustable. The axial direction of the winding needle 101 refers to the direction of the central axis of the winding needle 101, and the radial direction of the winding needle 101 refers to the direction passing through the central axis of the winding needle 101 and perpendicular to the central axis of the winding needle 101.

[0099] The winding needle 101 has opposite first and second ends 1013 and 1014 along the axial direction thereof. A first hole 1015 is formed on the end face of the first end 1013. The first hole 1015 is partially formed in the first needle body 1011 and partially formed in the second needle body 1012, and the first hole 1015 is formed by the first needle body 1011 and the second needle body 1012. The first hole 1015 is partially or entirely a first adjusting hole section 10151. The first adjusting hole section 10151 can be a circular hole, a rectangular hole or a hole with other shapes. When the first adjusting hole section 10151 is a circular hole, the radial direction of the first adjusting hole section 10151 refers to the diameter direction of the first adjusting hole section 10151; when the first adjusting hole section 10151 is a non-circular hole, the radial direction of the first adjusting hole section 10151 refers to the direction passing through the central axis of the first adjusting hole section 10151 and perpendicular to the central axis of the first adjusting hole section 10151. The radial dimension of the first adjusting hole section 10151 is gradually reduced in the direction close to the second end 1014, in other words, the radial dimension of the first adjusting hole section 10151 is gradually increased in the direction away from the second end 1014.

[0100] It is also necessary to mention that the first push rod 102 is a rod-shaped structure for adjusting the spacing between the first needle body 1011 and the second needle body 1012, that is, for adjusting the circumference of the winding needle 101. The shape, size and material of the first push rod 102 are not limited in the embodiment.

[0101] One end of the first push rod 102 is capable of being plugged into the first hole 1015. The first push rod 102 can be manually driven or electrically driven to realize axial reciprocating movement along the winding needle 101. The first push rod 102 has a first adjusting section 1021 which corresponds to the first adjusting hole section 10151. When the first push rod 102 reciprocates along the axial direction of the winding needle 101, the first adjusting section 1021 will also reciprocate relative to the first adjusting hole section 10151. Since the radial dimension of the first adjusting hole section 10151 is tapered in the direction close to the second end 1014, when the first adjusting section 1021 moves relative to the first adjusting hole section 10151 in the direction close to the second end 1014, the first adjusting section 1021 will move to the area where the radial dimension of the first adjusting hole section 10151 gradually decreases, at this time, with the movement of the first adjusting section 1021, the first adjusting section 1021 will gradually push the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually increases, so that the circumference of the winding needle 101 gradually increases; conversely, when the first adjusting section 1021 moves relative to the first adjusting hole section 10151 in the direction away from the second end 1014, the first adjusting section 1021 will move to the area where the radial dimension of the first adjusting hole section 10151 gradually increases, at this time, with the movement of the first adjusting section 1021, the first adjusting section 1021 will gradually reduce the push to the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually decreases, so that the circumference of the winding needle 101 gradually decreases.

[0102] Based on the above structure, before starting the winding operation, at least one of the separator, the positive electrode tab and the negative electrode tab can be clamped via the spacing between the first needle body 1011 and the second needle body 1012 as a clamping space. Specifically, in one possible implementation, one of the first needle body 1011 and the second needle body 1012 can be moved axially along the winding needle 101 and complete the needle insertion operation first, then at least one of the separator, the positive electrode tab and the negative electrode tab is delivered to the needle body that has completed the needle insertion operation, then the other one of the first needle body 1011 and the second needle body 1012 is moved axially along the winding needle 101 and completes the needle insertion operation, so that the first needle body 1011 and the second needle body 1012 are restored to the relative arrangement, so that the first needle body 1011 and the second needle body 1012 can jointly clamp at least one of the separator, the positive electrode tab and the negative electrode tab therebetween. In another possible implementation, the first needle body 1011 and the second needle body 1012 can be arranged relatively first, then at least one of the separator, the positive electrode tab and the negative electrode tab is delivered to the clamping space between the first needle body 1011 and the second needle body 1012, so that the first needle body 1011 and the second needle body 1012 jointly clamp at least one of the separator, the positive electrode tab and the negative electrode tab therebetween. In this way, the positive electrode tab, the separator and the negative electrode tab can be conveniently wound on the outer periphery of the winding needle 101 by the winding needle 101 subsequently.

[0103] Before starting the winding operation, and before the first needle body 1011 and the second needle body 1012 are arranged relatively, the position of the first push rod 102 is not adjusted according to the case that the last electrode assembly 12 wound by the winding device 10 does not have tab misalignment. Specifically, if the first push rod 102 is in the state of being pulled out of the first hole 1015 when the winding device 10 winds the last electrode assembly 12, the state of the first push rod 102 being pulled out of the first hole 1015 is maintained; if the first push rod 102 is in the state of being inserted into the first hole 1015 when the winding device 10 winds the last electrode assembly 12, the state of the first push rod 102 being inserted into the first hole 1015 is maintained, and the position of the first push rod 102 relative to the first hole 1015 is not changed. In this way, the spacing between the first needle body 1011 and the second needle body 1012, the circumference of the winding needle 101 can be maintained unchanged, which can facilitate the winding device 10 to continue winding the next electrode assembly 12 by the winding needle 101 with unchanged circumference.

[0104] Conversely, according to the existence of the tab misalignment phenomenon of the last electrode assembly 12 wound by the winding device 10, and according to the measured tab misalignment amount, the cooperation position of the first adjusting section 1021 of the first push rod 102 and the first adjusting hole section 10151 of the first hole 1015 is adjusted by controlling the insertion or extraction of the first push rod 102 into or out of the first hole 1015, and the reciprocating movement of the first push rod 102 along the axial direction of the winding needle 101, so as to adjust the pushing effect of the first adjusting section 1021 on the first needle body 1011 and the second needle body 1012, thereby adjusting the distance between the first needle body 1011 and the second needle body 1012 and adjusting the circumference of the winding needle 101. Specifically, by controlling the movement of the first adjusting section 1021 relative to the first adjusting hole section 10151 in the direction close to the second end 1014, the first adjusting section 1021 is moved to the region where the radial dimension of the first adjusting hole section 10151 gradually decreases, at this time, with the movement of the first adjusting section 1021, the first adjusting section 1021 will gradually push the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually increases, so that the circumference of the winding needle 101 gradually increases; conversely, by controlling the movement of the first adjusting section 1021 relative to the first adjusting hole section 10151 in the direction away from the second end 1014, or even controlling the extraction of the first push rod 102 out of the first hole 1015, the first adjusting section 1021 is moved to the region where the radial dimension of the first adjusting hole section 10151 gradually increases, at this time, with the movement of the first adjusting section 1021, the first adjusting section 1021 will gradually reduce the pushing on the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually decreases, so that the circumference of the winding needle 101 gradually decreases. In this way, the winding device 10 can continue to wind the next electrode assembly 12 by the winding needle 101 with adjusted circumference, so as to adjust the tab position of the next electrode assembly 12, reduce the tab misalignment amount, or even eliminate the tab misalignment phenomenon.

[0105] During the winding operation, the first needle body 1011 and the second needle body 1012 jointly rotate around the central axis of the winding needle 101, so as to wind the positive electrode sheet, the separator and the negative electrode sheet to form the electrode assembly 12.

[0106] After the winding operation is completed, the first push rod 102 can be first pulled out of the first hole 1015 to preliminarily reduce the distance between the first needle body 1011 and the second needle body 1012, so as to reduce the radial size of the winding needle 101 and reduce the contact stress between the winding needle 101 and the electrode assembly 12, thereby facilitating the reduction of the risk of subsequent needle pulling failure. Then, the first needle body 1011 and the second needle body 1012 are moved along the axial direction of the winding needle 101 in sequence to pull out the first needle body 1011 and the second needle body 1012 from the electrode assembly 12 in sequence, that is, the needle pulling operation is completed. In this way, the electrode assembly 12 can be facilitated to separate from the winding needle 101 and facilitate the subsequent process of the electrode assembly 12 on the basis of reducing the risk of damaging the electrode assembly 12.

[0107] Therefore, the winding device 10 provided by the embodiments of the present application can, when the ear tab misplacement phenomenon of the last electrode assembly 12 wound by the winding device 10 is found, adjust the distance between the first needle body 1011 and the second needle body 1012 and the circumference of the winding needle 101 according to the ear tab misplacement amount of the last electrode assembly 12 before starting to wind the next electrode assembly 12, by controlling the first push rod 102 to be inserted into or pulled out of the first hole 1015 and by controlling the first push rod 102 to reciprocate along the axial direction of the winding needle 101, so as to adjust the matching position of the first adjusting section 1021 of the first push rod 102 and the first adjusting hole section 10151 of the first hole 1015, adjust the pushing effect of the first adjusting section 1021 on the first needle body 1011 and the second needle body 1012, and adjust the distance between the first needle body 1011 and the second needle body 1012 and the circumference of the winding needle 101. On this basis, the winding device 10 can continue to wind the next electrode assembly 12 by the winding needle 101 with the adjusted circumference, so as to adjust the position of the ear tab of the next electrode assembly 12, reduce the ear tab misplacement amount, and even eliminate the ear tab misplacement phenomenon, thereby effectively improving the yield of the electrode assembly 12 wound by the winding device 10, effectively reducing the failure rate and the scrap rate of the electrode assembly 12 wound by the winding device 10, effectively improving the production efficiency and product quality of the batch production of the electrode assembly 12, and effectively reducing the cost of the batch production of the electrode assembly 12.

[0108] The winding device 10 provided by the embodiments of the present application can also, after winding the electrode assembly 12, preliminarily reduce the distance between the first needle body 1011 and the second needle body 1012 by first pulling out the first push rod 102 from the first hole 1015, so as to reduce the radial size of the winding needle 101 and reduce the contact stress between the winding needle 101 and the electrode assembly 12, thereby facilitating the reduction of the risk of subsequent needle pulling failure. On this basis, the first needle body 1011 and the second needle body 1012 are pulled out from the electrode assembly 12 in sequence, so as to reduce the damage and scrap of the electrode assembly 12, implement the needle pulling operation, facilitate the electrode assembly 12 to separate from the winding needle 101, and facilitate the subsequent process of the electrode assembly 12.

[0109] Please refer to Figure 4 、 Figure 5 、 Figure 6 In some embodiments of the present application, the width of the first adjusting section 1021 is tapered in the direction close to the second end 1014.

[0110] It should be noted that the width of the first adjusting section 1021 refers to the dimension of the first adjusting section 1021 in the direction of the distance between the first needle body 1011 and the second needle body 1012. Corresponding to the design that the radial dimension of the first adjusting hole section 10151 is tapered in the direction close to the second end 1014, the width of the first adjusting section 1021 is also tapered in the direction close to the second end 1014, in other words, the width of the first adjusting section 1021 is tapered in the direction away from the second end 1014.

[0111] Based on this, please refer to Figure 1 Before starting the winding operation, and under the premise that the first needle body 1011 and the second needle body 1012 are relatively arranged, according to the situation that the last electrode assembly 12 wound by the winding device 10 has tab misalignment phenomenon, and according to the measured tab misalignment amount, by controlling the first adjusting section 1021 to move relative to the first adjusting hole section 10151 in the direction close to the second end 1014, the region with larger width of the first adjusting section 1021 is moved to the region with gradually reduced radial dimension of the first adjusting hole section 10151, at this time, with the movement of the first adjusting section 1021, the first adjusting section 1021 will gradually push the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually increases, so that the circumference of the winding needle 101 gradually increases. Or, by controlling the first adjusting section 1021 to move relative to the first adjusting hole section 10151 in the direction away from the second end 1014, or even to move out of the first hole 1015, the region with larger width of the first adjusting section 1021 is moved to the region with gradually increased radial dimension of the first adjusting hole section 10151, at this time, with the movement of the first adjusting section 1021, the first adjusting section 1021 will gradually reduce the pushing force on the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually decreases, so that the circumference of the winding needle 101 gradually decreases.

[0112] Therefore, by adopting the above scheme, the pushing effect of the first adjusting segment 1021 on the first needle body 1011 and the second needle body 1012 can be adjusted by controlling the movement of the first adjusting segment 1021 relative to the first adjusting hole segment 10151 to adjust the contact between the different width regions of the first adjusting segment 1021 and the different radial size regions of the first adjusting hole segment 10151, the distance between the first needle body 1011 and the second needle body 1012 can be adjusted, and the circumference of the winding needle 101 can be adjusted. Moreover, based on the data variation trend of the radial size of the first adjusting hole segment 10151 along the axial direction of the winding needle 101 and the data variation trend of the width of the first adjusting segment 1021 along the axial direction of the winding needle 101, the relationship between the movement stroke of the first adjusting segment 1021 along the axial direction of the winding needle 101 and the distance between the first needle body 1011 and the second needle body 1012 and the relationship between the movement stroke of the first adjusting segment 1021 along the axial direction of the winding needle 101 and the circumference of the winding needle 101 can be estimated, so that the distance between the first needle body 1011 and the second needle body 1012 and the circumference of the winding needle 101 can be accurately adjusted by controlling the movement stroke of the first adjusting segment 1021 along the axial direction of the winding needle 101, thereby improving the adjustment accuracy.

[0113] Please refer to Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 In some embodiments of the present application, the winding device 10 further comprises a first support 103 and a second support 104. The first support 103 is arranged at the first end 1013 and is tightly installed on the side of the first needle body 1011 away from the second needle body 1012. The second support 104 is arranged at the first end 1013 and is tightly installed on the side of the second needle body 1012 away from the first needle body 1011.

[0114] It should be noted that the first support 103 is a structure for supporting the first needle body 1011 at the first end 1013, which can enhance the structural strength of the first needle body 1011 and reduce the risk of bending and breaking of the first needle body 1011. The first support 103 can be tightly installed on the side of the first needle body 1011 away from the second needle body 1012 by means of, but not limited to, bolts. When the first needle body 1011 moves along the axial direction of the winding needle 101 for needle pulling or insertion operation, the first support 103 can move along the axial direction of the winding needle 101 synchronously with the first needle body 1011. Optionally, the first support 103 can be connected with a stretching mechanism (not shown in the figure) so that the stretching mechanism can drive the first needle body 1011 to move along the axial direction of the winding needle 101 through the first support 103 to complete the needle pulling or insertion operation of the first needle body 1011.

[0115] The second support 104 is arranged opposite to the first support 103 and is independently formed. The second support 104 is a structure for supporting the second needle body 1012 at the first end 1013, which can enhance the structural strength of the second needle body 1012 and reduce the risk of bending and breaking of the second needle body 1012. The second support 104 can be mounted on the side of the second needle body 1012 away from the first needle body 1011 by means of, but not limited to, bolts. When the second needle body 1012 moves along the axial direction of the winding needle 101 for needle pulling or insertion operation, the second support 104 can move along the axial direction of the winding needle 101 synchronously with the second needle body 1012. Optionally, the second support 104 can be connected with the stretching mechanism, so that the stretching mechanism drives the second needle body 1012 to move along the axial direction of the winding needle 101 through the second support 104, thereby completing the needle pulling or insertion operation of the second needle body 1012.

[0116] By adopting the above scheme, the first support 103 mounted on the side of the first needle body 1011 away from the second needle body 1012 can support the first needle body 1011 at the first end 1013, thereby enhancing the structural strength of the first needle body 1011 and reducing the risk of bending and breaking of the first needle body 1011 during needle pulling, insertion and winding. Similarly, the second support 104 mounted on the side of the second needle body 1012 away from the first needle body 1011 can support the second needle body 1012 at the first end 1013, thereby enhancing the structural strength of the second needle body 1012 and reducing the risk of bending and breaking of the second needle body 1012 during needle pulling, insertion and winding. Thus, the service life of the winding needle 101 and the winding device 10 can be effectively guaranteed and prolonged.

[0117] In other possible embodiments, the first support 103 and the second support 104 can be elastically connected and hold the first needle body 1011 and the second needle body 1012 between them at the first end 1013. In this way, the elastically connected first support 103 and the second support 104 can jointly hold and stabilize the relative state of the first needle body 1011 and the second needle body 1012 at the first end 1013, thereby effectively reducing the risk of the needle jump phenomenon of the needle winding 101 during the change of the spacing between the first needle body 1011 and the second needle body 1012 and the change of the circumference of the needle winding 101, or even during the winding operation of the needle winding 101, thereby promoting the stable performance of the needle winding 101 and effectively reducing the risk of poor quality of the electrode assembly 12 caused by the needle jump of the needle winding 101. In this scenario, the first support 103 and the second support 104 remain elastically connected, i.e., the first support 103 is not stably connected with the first needle body 1011, and the second support 104 is not stably connected with the second needle body 1012. Based on this, when the first needle body 1011 moves along the axial direction of the needle winding 101 for needle pulling or insertion operation, the first support 103 does not move along the axial direction of the needle winding 101 synchronously with the first needle body 1011; when the second needle body 1012 moves along the axial direction of the needle winding 101 for needle pulling or insertion operation, the second support 104 does not move along the axial direction of the needle winding 101 synchronously with the second needle body 1012.

[0118] Please refer to Figure 5 、 Figure 6 、 Figure 8 Please refer to Figure 1 In some embodiments of the present application, the winding device 10 further comprises a first support seat 105, a first elastic member 106, and a second elastic member 107. The first support seat 105 is arranged at the first end 1013 and is sleeved on the outer periphery of the first support 103 and the second support 104. The first elastic member 106 is installed between the first support seat 105 and the first support 103. The second elastic member 107 is installed between the first support seat 105 and the second support 104.

[0119] It should be noted that the first support seat 105 is a stable structure for supporting the first end 1013 of the winding needle 101. The position of the first support seat 105 is basically stable and does not move with the movement of the first needle body 1011 or the second needle body 1012. Specifically, when the first needle body 1011 moves along the axial direction of the winding needle 101 to complete the needle insertion operation, the first needle body 1011 will pass through the middle of the first support seat 105, and when the first needle body 1011 is moved into position, the first support 103 stably mounted on the first needle body 1011 will be located in the first support seat 105. Similarly, when the second needle body 1012 moves along the axial direction of the winding needle 101 to complete the needle insertion operation, the second needle body 1012 will pass through the middle of the second support seat 110, and when the second needle body 1012 is moved into position, the second support 104 stably mounted on the second needle body 1012 will be located in the second support seat 110. Thus, the first support seat 105 can be sleeved on the outer periphery of the first support 103 and the second support 104, and can reliably support the first support 103, the second support 104, the first end 1013 of the first needle body 1011 and the first end 1013 of the second needle body 1012.

[0120] The first elastic member 106 is a structure made of elastic material and has elasticity. The material of the first elastic member 106 is not uniquely limited in the embodiment, for example, rubber or latex material can be used. The first elastic member 106 is mounted between the first support seat 105 and the first support 103. In one possible implementation, the first elastic member 106 can be stably mounted on the first support seat 105 by, but not limited to, adhesive means. At this time, when the first needle body 1011 moves along the axial direction of the winding needle 101 to perform the needle insertion or extraction operation, the first elastic member 106 does not move with the movement of the first needle body 1011; when the first needle body 1011 completes the needle insertion operation, the first elastic member 106 elastically abuts and closely fits the first support 103, achieving elastic abutment between the first support seat 105 and the first support 103. In another possible implementation, the first elastic member 106 can be stably mounted on the first support 103 by, but not limited to, adhesive means. At this time, when the first needle body 1011 moves along the axial direction of the winding needle 101 to perform the needle insertion or extraction operation, the first elastic member 106 moves with the movement of the first needle body 1011; when the first needle body 1011 completes the needle insertion operation, the first elastic member 106 will be located in the first support seat 105 with the first support 103, and the first elastic member 106 will elastically abut and closely fit the first support seat 105, achieving elastic abutment between the first support seat 105 and the first support 103.

[0121] The second elastic member 107 is a structure with elasticity made of elastic material. The material of the second elastic member 107 is not limited in the embodiment, for example, rubber or latex material can be used. The second elastic member 107 is installed between the second support seat 110 and the second support 104. In one possible implementation, the second elastic member 107 can be firmly installed on the second support seat 110 by, but not limited to, adhesive method. At this time, when the second needle body 1012 moves along the axial direction of the winding needle 101 to perform the needle insertion or needle extraction operation, the second elastic member 107 does not move with the movement of the second needle body 1012. When the second needle body 1012 completes the needle insertion operation, the second elastic member 107 elastically abuts and tightly fits the second support 104, realizing the elastic abutment between the second support seat 110 and the second support 104. In another possible implementation, the second elastic member 107 can be firmly installed on the second support 104 by, but not limited to, adhesive method. At this time, when the second needle body 1012 moves along the axial direction of the winding needle 101 to perform the needle insertion or needle extraction operation, the second elastic member 107 moves with the movement of the second needle body 1012. When the second needle body 1012 completes the needle insertion operation, the second elastic member 107 is located in the second support seat 110 with the second support 104, and the second elastic member 107 elastically abuts and tightly fits the second support seat 110, realizing the elastic abutment between the second support seat 110 and the second support 104.

[0122] By using the above scheme, the first support seat 105 can reliably support the first support 103, the second support 104, the first end 1013 of the first needle body 1011 and the first end 1013 of the second needle body 1012, so as to stabilize the position of the first end 1013 of the winding needle 101. Based on this, it is beneficial to stabilize the rotation axis of the winding needle 101, so as to facilitate the smooth rotation of the winding needle 101, and facilitate the smooth winding operation of the winding needle 101.

[0123] On this basis, the first elastic member 106 is elastically abutted between the first support seat 105 and the first support 103, and when the first push rod 102 is inserted into the first hole 1015 and the distance between the first needle body 1011 and the second needle body 1012 changes, the first elastic member 106 can elastically abut against the first needle body 1011 to stabilize the state of the first needle body 1011. Similarly, the second elastic member 107 is elastically abutted between the second support seat 110 and the second support 104, and when the first push rod 102 is inserted into the first hole 1015 and the distance between the first needle body 1011 and the second needle body 1012 changes, the second elastic member 107 can elastically abut against the second needle body 1012 to stabilize the state of the second needle body 1012. Thus, the first elastic member 106 and the second elastic member 107 can jointly press the winder 101 to reduce the risk of the winder 101 jumping during the change of the circumference of the winder 101, thereby stabilizing the winder 101 and enabling the winder 101 to rotate smoothly and perform winding smoothly at the adjusted circumference, thereby effectively reducing the risk of the electrode assembly 12 formed by winding having quality problems due to the jumping of the winder 101, and effectively improving the yield of the electrode assembly 12 formed by the winding device 10.

[0124] Of course, in other possible embodiments, only the first elastic member 106 or the second elastic member 107 can be provided, which can also achieve similar effects to a certain extent.

[0125] Please refer to Figure 2 、 Figure 5 、 Figure 6 In some embodiments of the present application, the winding device 10 further comprises a first driver 108. The first driver 108 is connected to one end of the first push rod 102 away from the winder 101, and is used to drive the first push rod 102 to reciprocate along the axial direction of the winder 101.

[0126] It should be noted that the first driver 108 can be, but is not limited to, an air cylinder. The first driver 108 is arranged at the end side of the first push rod 102 away from the winder 101, and is connected to the end of the first push rod 102 away from the winder 101. The present embodiment does not limit the connection mode between the first driver 108 and the first push rod 102. The first driver 108 can be used to drive the first push rod 102 to reciprocate along the axial direction of the winder 101, so as to insert or pull out the first hole 1015.

[0127] By adopting the above scheme, the first push rod 102 can be driven by the first driver 108 to reciprocate along the axial direction of the winding needle 101, so as to control the insertion or extraction of the first push rod 102 into or out of the first hole 1015 in a time-saving, labor-saving, convenient and fast manner, and the movement stroke of the first push rod 102 in the first hole 1015 can be accurately controlled, thereby facilitating the improvement of the adjustment convenience and accuracy of the circumference of the winding needle 101.

[0128] Please refer to Figure 4 、 Figure 5 、 Figure 6 In some embodiments of the present application, the first hole 1015 includes a first through hole section 10152, a first adjustment hole section 10151 and a first accommodating hole section 10153 which are sequentially communicated in the direction close to the second end 1014. The first push rod 102 has a first main body section 1022 and a first adjustment section 1021 arranged at the end of the first main body section 1022, and part of the first main body section 1022 is arranged in the first through hole section 10152.

[0129] It should be noted that the first push rod 102 is divided into the first main body section 1022 and the first adjustment section 1021 along the extension direction thereof. The first adjustment section 1021 is arranged at the end of the first main body section 1022 close to the winding needle 101, and based on this, when the first push rod 102 is inserted into the first hole 1015, the first adjustment section 1021 will be the first part inserted into the first hole 1015, thereby facilitating the cooperation of the first adjustment section 1021 with the first adjustment hole section 10151 to adjust the distance between the first needle body 1011 and the second needle body 1012.

[0130] It should also be noted that the first hole 1015 can be divided into the first through hole section 10152, the first adjustment hole section 10151 and the first accommodating hole section 10153 along the direction close to the second end 1014, and the first through hole section 10152, the first adjustment hole section 10151 and the first accommodating hole section 10153 are sequentially communicated.

[0131] In one possible implementation, the radial dimension of the first through-hole segment 10152 remains unchanged in the direction close to the second end 1014, and the radial dimension of the first through-hole segment 10152 is greater than or equal to the maximum radial dimension of the first adjustment hole segment 10151. In another possible implementation, the radial dimension of the first through-hole segment 10152 is tapered in the direction close to the second end 1014, and the minimum radial dimension of the first through-hole segment 10152 is greater than or equal to the maximum radial dimension of the first adjustment hole segment 10151. In this way, the first adjustment segment 1021 can be passed through the first through-hole segment 10152 to be disposed in the first adjustment hole segment 10151, and part of the first main body segment 1022 can be accommodated in the first through-hole segment 10152, thereby effectively reducing the influence of the first main body segment 1022 on the distance between the first needle body 1011 and the second needle body 1012, so that the change in the distance between the first needle body 1011 and the second needle body 1012 is mainly controlled by the cooperation between the first adjustment segment 1021 and the first adjustment hole segment 10151.

[0132] In one possible implementation, the radial dimension of the first through-hole segment 10152 remains unchanged in the direction close to the second end 1014, and the radial dimension of the first through-hole segment 10152 is greater than or equal to the maximum radial dimension of the first adjustment hole segment 10151. In another possible implementation, the radial dimension of the first through-hole segment 10152 is tapered in the direction close to the second end 1014, and the minimum radial dimension of the first through-hole segment 10152 is greater than or equal to the maximum radial dimension of the first adjustment hole segment 10151. In this way, the first adjustment segment 1021 can be passed through the first through-hole segment 10152 to be disposed in the first adjustment hole segment 10151, and part of the first main body segment 1022 can be accommodated in the first through-hole segment 10152, thereby effectively reducing the influence of the first main body segment 1022 on the distance between the first needle body 1011 and the second needle body 1012, so that the change in the distance between the first needle body 1011 and the second needle body 1012 is mainly controlled by the cooperation between the first adjustment segment 1021 and the first adjustment hole segment 10151.

[0133] By adopting the above scheme, the first push rod 102 can be inserted into the first hole 1015 by the first adjusting segment 1021 first, and the first adjusting segment 1021 can be pulled out of the first hole 1015 by the first adjusting segment 1021 later, so that the influence of the other parts of the first push rod 102 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, and the change of the distance between the first needle body 1011 and the second needle body 1012 can be mainly controlled by the cooperation between the first adjusting segment 1021 and the first adjusting hole segment 10151. Correspondingly, the first hole 1015 can accommodate the part of the first main body segment 1022 inserted into the first hole 1015 by the first passing hole segment 10152, and accommodate the part of the first adjusting segment 1021 passing out of the first adjusting hole segment 10151 by the first accommodating hole segment 10153, so that the influence of the part of the first main body segment 1022 inserted into the first hole 1015 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, the influence of the part of the first adjusting segment 1021 passing out of the first adjusting hole segment 10151 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, and the change of the distance between the first needle body 1011 and the second needle body 1012 can be mainly controlled by the cooperation between the first adjusting segment 1021 and the first adjusting hole segment 10151. Thus, the influencing factors of the change of the distance between the first needle body 1011 and the second needle body 1012 can be reduced, and the adjustment accuracy can be improved.

[0134] Please refer to Figure 1 、 Figure 5 、 Figure 6 In some embodiments of the present application, the first adjusting segment 1021 is a wedge-shaped structure, and the first adjusting hole segment 10151 is a wedge-shaped hole, and the first adjusting segment 1021 is wedge-shaped with the first adjusting hole segment 10151.

[0135] It should be noted that the first adjusting segment 1021 is a wedge-shaped structure, that is, the shape of the first adjusting segment 1021 is wedge-shaped. Among them, the wedge-shaped refers to the shape of one end thick and the other end narrow, and the middle transition changes, such as a conical shape. Correspondingly, the first adjusting hole segment 10151 is a wedge-shaped hole, so that the first adjusting segment 1021 is wedge-shaped with the first adjusting hole segment 10151.

[0136] By adopting the above scheme, the first needle body 1011 and the second needle body 1012 can be precisely adjusted in spacing by adjusting the fitting position of the first adjusting segment 1021 and the first adjusting hole segment 10151, and the circumference of the winding needle 101 can be precisely adjusted. Moreover, since the first adjusting segment 1021 and the first adjusting hole segment 10151 can form a surface contact, the contact between the first adjusting segment 1021 and the first adjusting hole segment 10151 can be smooth, the spacing between the first needle body 1011 and the second needle body 1012 can be smoothly changed, and can be kept stable after adjustment, so that the winding needle 101 can be smoothly rotated at the adjusted circumference and smoothly perform the winding operation, the risk of the electrode assembly 12 formed by winding having quality problems due to the change of the circumference of the winding needle 101 during the winding operation can be effectively reduced, and the qualified rate of the electrode assembly 12 formed by the winding device 10 can be effectively improved.

[0137] Please refer to Figure 4 , Figure 5 , Figure 7 Please refer to Figure 1 In some embodiments of the present application, the first needle body 1011 and the second needle body 1012 jointly form a second hole 1016 at the second end 1014, at least a part of the second hole 1016 is a second adjusting hole segment 10161, and the radial dimension of the second adjusting hole segment 10161 is gradually reduced in the direction close to the first end 1013. The winding device 10 further comprises a second push rod 109. The second push rod 109 is inserted into the second hole 1016 and can reciprocally move along the axial direction of the winding needle 101. The second push rod 109 has a second adjusting segment 1091 fitted in the second adjusting hole segment 10161.

[0138] It should be noted that the second hole 1016 is formed in the end face of the second end 1014 of the winding needle 101, and a part of the second hole 1016 is formed in the first needle body 1011 and the other part of the second hole 1016 is formed in the second needle body 1012, and the second hole 1016 is formed by the first needle body 1011 and the second needle body 1012. The second hole 1016 is partially or entirely a second adjusting hole section 10161. The second adjusting hole section 10161 can be a circular hole, a rectangular hole or a hole with other shapes. When the second adjusting hole section 10161 is a circular hole, the radial direction of the second adjusting hole section 10161 refers to the diameter direction of the second adjusting hole section 10161; when the second adjusting hole section 10161 is a non-circular hole, the radial direction of the second adjusting hole section 10161 refers to the direction perpendicular to the central axis of the second adjusting hole section 10161. The radial dimension of the second adjusting hole section 10161 is gradually reduced in the direction close to the first end 1013, in other words, the radial dimension of the second adjusting hole section 10161 is gradually increased in the direction away from the first end 1013.

[0139] It should also be noted that the second push rod 109 is a rod-shaped structure for adjusting the distance between the first needle body 1011 and the second needle body 1012 together with the first push rod 102, that is, a rod-shaped structure for adjusting the circumference of the winding needle 101 together with the first push rod 102. The shape, size, material and the like of the second push rod 109 are not limited in this embodiment.

[0140] One end of the second push rod 109 is capable of being inserted and pulled out of the second hole 1016. The second push rod 109 can be manually driven or electrically driven to realize axial reciprocating movement along the winding needle 101. The second push rod 109 has a second adjusting section 1091 which corresponds to the second adjusting hole section 10161. When the second push rod 109 reciprocates along the axial direction of the winding needle 101, the second adjusting section 1091 will also reciprocate relative to the second adjusting hole section 10161. Since the radial dimension of the second adjusting hole section 10161 is taperedly arranged in the direction close to the first end 1013, when the second adjusting section 1091 moves relative to the second adjusting hole section 10161 in the direction close to the first end 1013, the second adjusting section 1091 will move to the region where the radial dimension of the second adjusting hole section 10161 gradually decreases, at this time, with the movement of the second adjusting section 1091, the second adjusting section 1091 will gradually push the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually increases, so that the circumference of the winding needle 101 gradually increases; on the contrary, when the second adjusting section 1091 moves relative to the second adjusting hole section 10161 in the direction away from the first end 1013, the second adjusting section 1091 will move to the region where the radial dimension of the second adjusting hole section 10161 gradually increases, at this time, with the movement of the second adjusting section 1091, the second adjusting section 1091 will gradually reduce the pushing of the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually decreases, so that the circumference of the winding needle 101 gradually decreases.

[0141] The action of the second push rod 109 is consistent with that of the first push rod 102. Specifically, when the first push rod 102 is pulled out of the first hole 1015, the second push rod 109 is also pulled out of the second hole 1016. When the first push rod 102 is inserted into the first hole 1015, the second push rod 109 is also inserted into the second hole 1016, and the adjustment amount of the second push rod 109 to the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014 is substantially equal to the adjustment amount of the first push rod 102 to the distance between the first needle body 1011 and the second needle body 1012 at the first end 1013. In this way, the change amount of the circumference of the winding needle 101 at the first end 1013 and the second end 1014 can be made consistent, the change amount of the circumference of the winding needle 101 as a whole can be made consistent, so that the winding needle 101 can be wound to form the electrode assembly 12 with a consistent circumference adjustment amount everywhere, the risk of the electrode assembly 12 wound to form by the winding device 10 appearing to be of poor quality due to inconsistent circumference adjustment amount everywhere can be effectively reduced, and the yield of the electrode assembly 12 wound to form by the winding device 10 can be effectively improved.

[0142] By adopting the above scheme, on the basis of adjusting the distance between the first needle body 1011 and the second needle body 1012 by plugging the first end 1013 of the first push rod 102 into the first hole 1015, the second push rod 109 keeps the same action as the first push rod 102 to plug the second end 1014 into the second hole 1016, and also participates in adjusting the distance between the first needle body 1011 and the second needle body 1012. Based on this, the distance between the first needle body 1011 and the second needle body 1012 can be adjusted by the first push rod 102 and the second push rod 109 together, the circumference of the needle winding 101 can be adjusted together, and the adjustment amount of the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014 of the second push rod 109 can be consistent with the adjustment amount of the distance between the first needle body 1011 and the second needle body 1012 at the first end 1013 of the first push rod 102, so that the needle winding 101 can be wound to form the electrode assembly 12 with a circumference with consistent adjustment amount everywhere, the risk of poor quality of the electrode assembly 12 caused by inconsistent adjustment amount of the circumference everywhere can be effectively reduced, and the yield of the electrode assembly 12 wound by the winding device 10 can be effectively improved.

[0143] Of course, in other possible embodiments, other structure designs can be adopted to adjust the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014, which is not limited in the present embodiment. Even when the second end 1014 of the needle winding 101 is not limited, and the adjustment of the distance between the first needle body 1011 and the second needle body 1012 at the first end 1013 of the first push rod 102 can simultaneously drive the second end 1014 to form the same adjustment, the second end 1014 of the needle winding 101 can also omit the structure for adjusting the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014.

[0144] Please refer to Figure 4 , Figure 5 , Figure 7 In some embodiments of the present application, the width of the second adjusting section 1091 is gradually reduced in the direction close to the first end 1013.

[0145] It should be noted that the width of the second adjusting section 1091 refers to the size of the second adjusting section 1091 in the direction of the distance between the first needle body 1011 and the second needle body 1012. Corresponding to the design that the radial dimension of the second adjusting hole section 10161 is gradually reduced in the direction close to the first end 1013, the width of the second adjusting section 1091 is also gradually reduced in the direction close to the first end 1013, in other words, the width of the second adjusting section 1091 is gradually expanded in the direction away from the first end 1013.

[0146] Based on this, when it is necessary to adjust the distance between the first needle body 1011 and the second needle body 1012 and the circumference of the winding needle 101, the second adjusting segment 1091 can be controlled to move relative to the second adjusting hole segment 10161 in a direction close to the first end 1013, so that the region with a larger width of the second adjusting segment 1091 moves to the region with gradually reduced radial dimension of the second adjusting hole segment 10161. At this time, with the movement of the second adjusting segment 1091, the second adjusting segment 1091 will gradually push the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually increases, and the circumference of the winding needle 101 gradually increases. Conversely, the second adjusting segment 1091 can be controlled to move relative to the second adjusting hole segment 10161 in a direction away from the first end 1013, or even to move out of the second hole 1016, so that the region with a larger width of the second adjusting segment 1091 moves to the region with gradually increased radial dimension of the second adjusting hole segment 10161. At this time, with the movement of the second adjusting segment 1091, the second adjusting segment 1091 will gradually reduce the pushing force on the first needle body 1011 and the second needle body 1012, so that the distance between the first needle body 1011 and the second needle body 1012 gradually decreases, and the circumference of the winding needle 101 gradually decreases.

[0147] Therefore, by adopting the above scheme, the pushing effect of the second adjusting segment 1091 on the first needle body 1011 and the second needle body 1012 can be adjusted by controlling the movement of the second adjusting segment 1091 relative to the second adjusting hole segment 10161 to adjust the contact and cooperation between the different width regions of the second adjusting segment 1091 and the different radial dimension regions of the second adjusting hole segment 10161, the distance between the first needle body 1011 and the second needle body 1012 can be adjusted, and the circumference of the winding needle 101 can be adjusted. Moreover, based on the data variation trend of the radial dimension of the second adjusting hole segment 10161 along the axial direction of the winding needle 101 and the data variation trend of the width of the second adjusting segment 1091 along the axial direction of the winding needle 101, the relationship between the movement stroke of the second adjusting segment 1091 along the axial direction of the winding needle 101 and the distance between the first needle body 1011 and the second needle body 1012, and the relationship between the movement stroke of the second adjusting segment 1091 along the axial direction of the winding needle 101 and the circumference of the winding needle 101 can be estimated, so that the distance between the first needle body 1011 and the second needle body 1012 and the circumference of the winding needle 101 can be accurately adjusted by controlling the movement stroke of the second adjusting segment 1091 along the axial direction of the winding needle 101, thereby facilitating the improvement of the adjustment accuracy.

[0148] Please refer to Figure 4 , Figure 5 , Figure 7 , Figure 9In some embodiments of the present application, the winding device 10 further comprises a second support seat 110. The second support seat 110 is provided with a third hole 1101 on the side close to the winding needle 101, and the bottom of the third hole 1101 is provided with a fourth hole 1102 penetrating through the third hole 1101. The second end 1014 of the winding needle 101 is inserted into the third hole 1101, and the second push rod 109 is inserted into the fourth hole 1102.

[0149] It should be noted that the second support seat 110 is a stable structure for supporting the second end 1014 of the winding needle 101. The position of the second support seat 110 is basically stable and does not move with the movement of the first needle body 1011 or the second needle body 1012. The third hole 1101 is formed on the side of the second support seat 110 close to the winding needle 101. Based on this, when the first needle body 1011 moves along the axial direction of the winding needle 101 to complete the needle insertion operation, the end of the first needle body 1011 will be inserted into the third hole 1101 of the second support seat 110. Similarly, when the second needle body 1012 moves along the axial direction of the winding needle 101 to complete the needle insertion operation, the end of the second needle body 1012 will also be inserted into the third hole 1101 of the second support seat 110. Thus, the second support seat 110 can reliably support the second end 1014 of the first needle body 1011 and the second end 1014 of the second needle body 1012.

[0150] The second support seat 110 is also provided with a fourth hole 1102 at the bottom of the third hole 1101, and the fourth hole 1102 is arranged penetratingly in the direction away from the winding needle 101. The second push rod 109 can be inserted into the fourth hole 1102 to facilitate the insertion and extraction of the second hole 1016. Even when the second push rod 109 is extracted from the second hole 1016, the second push rod 109 can still be accommodated in the fourth hole 1102 without being extracted from the fourth hole 1102. Thus, the second support seat 110 can support and position the second push rod 109 to facilitate the accurate insertion and extraction of the second push rod 109 into the second hole 1016.

[0151] By adopting the above scheme, the second end 1014 of the winding needle 101 can be reliably supported by the second support seat 110 to stabilize the position of the second end 1014 of the winding needle 101, based on which the rotation axis of the winding needle 101 can be stabilized, so that the winding needle 101 can rotate smoothly, and the winding needle 101 can perform the winding operation smoothly. The second push rod 109 can also be supported and positioned by the second support seat 110 to facilitate the accurate insertion and extraction of the second push rod 109 into the second hole 1016.

[0152] Please refer to Figure 5 、 Figure 7 、 Figure 9 Please refer to Figure 1In some embodiments of the present application, the winding device 10 further comprises a third elastic member 111. The third elastic member 111 is installed in the third hole 1101 and is sleeved on the outer periphery of the second end 1014 of the winding needle 101.

[0153] It should be noted that the third elastic member 111 is a structure made of elastic material and has elasticity. The material of the third elastic member 111 is not uniquely limited in the present embodiment. For example, the third elastic member 111 can be made of rubber or latex. The third elastic member 111 is installed in the third hole 1101 and can be stably installed in the second support seat 110 by, but not limited to, an adhesive method. The third elastic member 111 is in a closed loop shape or an open loop shape. When the second end 1014 of the winding needle 101 is inserted into the third hole 1101, the third elastic member 111 is sleeved on the outer periphery of the second end 1014 of the winding needle 101 and elastically abuts and tightly fits the second end 1014 of the winding needle 101, thereby achieving elastic abutment between the second support seat 110 and the second end 1014 of the winding needle 101.

[0154] By using the above scheme, when the second end 1014 of the winding needle 101 is inserted into the third hole 1101, the third elastic member 111 can be elastically abutted between the hole wall of the third hole 1101 and the second end 1014 of the winding needle 101. Based on this, when the second push rod 109 is inserted into the second hole 1016 and the distance between the first needle body 1011 and the second needle body 1012 changes, the third elastic member 111 can elastically abut against the second end 1014 of the winding needle 101 to stabilize the state of the second end 1014 of the winding needle 101. Thus, the risk of the winding needle 101 jumping during the change of its circumference can be effectively reduced, so that the winding needle 101 can be stabilized, the winding needle 101 can smoothly rotate and perform winding work with the adjusted circumference, the risk of the electrode assembly 12 formed by winding due to the jumping of the winding needle 101 can be effectively reduced, and the yield of the electrode assembly 12 formed by winding by the winding device 10 can be effectively improved. Moreover, by installing the third elastic member 111 in the third hole 1101, the insertion resistance of the second end 1014 of the winding needle 101 can be effectively reduced during the insertion of the second end 1014 of the winding needle 101 into the third hole 1101 by the elastic deformation of the third elastic member 111.

[0155] Please refer to Figure 2 、 Figure 5 、 Figure 7 In some embodiments of the present application, the winding device 10 further comprises a second driver 112. The second driver 112 is connected to the end of the second push rod 109 away from the winding needle 101 and is used to drive the second push rod 109 to reciprocate along the axial direction of the winding needle 101.

[0156] It should be noted that the second driver 112 can be, but is not limited to, a cylinder. The second driver 112 is arranged at the end side of the second push rod 109 away from the winding needle 101, and is connected with the end of the second push rod 109 away from the winding needle 101. The connection mode between the second driver 112 and the second push rod 109 is not limited in the embodiment. The second driver 112 can be used to drive the second push rod 109 to reciprocate along the axial direction of the winding needle 101, so as to insert or pull out the second hole 1016.

[0157] By adopting the above scheme, the second push rod 109 can be driven by the second driver 112 to reciprocate along the axial direction of the winding needle 101, so as to control the second push rod 109 to insert or pull out the second hole 1016 in a time-saving, labor-saving, convenient and fast manner, and the movement stroke of the second push rod 109 in the second hole 1016 can be accurately controlled, thereby facilitating to improve the adjustment convenience and accuracy of the circumference of the winding needle 101.

[0158] Please refer to Figure 4 , Figure 5 , Figure 7 In some embodiments of the present application, the second hole 1016 includes a second through hole section 10162, a second adjustment hole section 10161 and a second accommodating hole section 10163 which are sequentially communicated in the direction close to the first end 1013. The second push rod 109 has a second main body section 1092 and a second adjustment section 1091 arranged at the end of the second main body section 1092, and part of the second main body section 1092 is arranged in the second through hole section 10162.

[0159] It should be noted that the second push rod 109 is divided into the second main body section 1092 and the second adjustment section 1091 along the extension direction thereof. The second adjustment section 1091 is arranged at the end of the second main body section 1092 close to the winding needle 101. Based on this, when the second push rod 109 is inserted into the second hole 1016, the second adjustment section 1091 will be the first part inserted into the second hole 1016, so as to facilitate the cooperation between the second adjustment section 1091 and the second adjustment hole section 10161, and adjust the distance between the first needle body 1011 and the second needle body 1012.

[0160] It should also be noted that the second hole 1016 can be divided into the second through hole section 10162, the second adjustment hole section 10161 and the second accommodating hole section 10163 along the direction close to the first end 1013, and the second through hole section 10162, the second adjustment hole section 10161 and the second accommodating hole section 10163 are sequentially communicated.

[0161] In one possible implementation, the radial dimension of the second through-hole segment 10162 remains unchanged in the direction close to the first end 1013, and the radial dimension of the second through-hole segment 10162 is greater than or equal to the maximum radial dimension of the second adjustment hole segment 10161. In another possible implementation, the radial dimension of the second through-hole segment 10162 is tapered in the direction close to the first end 1013, and the minimum radial dimension of the second through-hole segment 10162 is greater than or equal to the maximum radial dimension of the second adjustment hole segment 10161. In this way, the second adjustment segment 1091 can be arranged to pass through the second through-hole segment 10162 and be arranged in the second adjustment hole segment 10161, and part of the second main body segment 1092 can be arranged in the second through-hole segment 10162, so that the influence of the second main body segment 1092 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, and the change in the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014 can be mainly controlled by the cooperation between the second adjustment segment 1091 and the second adjustment hole segment 10161.

[0162] In one possible implementation, the radial dimension of the second through-hole segment 10162 remains unchanged in the direction close to the first end 1013, and the radial dimension of the second through-hole segment 10162 is greater than or equal to the maximum radial dimension of the second adjustment hole segment 10161. In another possible implementation, the radial dimension of the second through-hole segment 10162 is tapered in the direction close to the first end 1013, and the minimum radial dimension of the second through-hole segment 10162 is greater than or equal to the maximum radial dimension of the second adjustment hole segment 10161. In this way, the second adjustment segment 1091 can be arranged to pass through the second through-hole segment 10162 and be arranged in the second adjustment hole segment 10161, and part of the second main body segment 1092 can be arranged in the second through-hole segment 10162, so that the influence of the second main body segment 1092 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, and the change in the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014 can be mainly controlled by the cooperation between the second adjustment segment 1091 and the second adjustment hole segment 10161.

[0163] By adopting the above scheme, the second push rod 109 can be inserted into the second hole 1016 in advance of other parts of the second push rod 109 by arranging the second adjusting segment 1091 at the end of the second body segment 1092, and the second adjusting segment 1091 can be pulled out of the second hole 1016 after other parts of the second push rod 109, so that the influence of other parts of the second push rod 109 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, and the change in the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014 can be mainly controlled by the cooperation between the second adjusting segment 1091 and the second adjusting hole segment 10161. Correspondingly, the second hole 1016 can accommodate the part of the second body segment 1092 inserted into the second hole 1016 through the second insertion hole segment 10162, and the part of the second adjusting segment 1091 passing through the second adjusting hole segment 10161 through the second accommodating hole segment 10163, so that the influence of the part of the second body segment 1092 inserted into the second hole 1016 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, and the influence of the part of the second adjusting segment 1091 passing through the second adjusting hole segment 10161 on the distance between the first needle body 1011 and the second needle body 1012 can be effectively reduced, so that the change in the distance between the first needle body 1011 and the second needle body 1012 at the second end 1014 can be mainly controlled by the cooperation between the second adjusting segment 1091 and the second adjusting hole segment 10161. Thus, the influencing factors of the change in the distance between the first needle body 1011 and the second needle body 1012 can be reduced, and the adjustment accuracy can be improved.

[0164] Please refer to Figure 1 、 Figure 5 、 Figure 7 In some embodiments of the present application, the second adjusting segment 1091 is a wedge-shaped structure, and the second adjusting hole segment 10161 is a wedge-shaped hole, and the second adjusting segment 1091 is wedge-shaped with the second adjusting hole segment 10161.

[0165] It should be noted that the second adjusting segment 1091 is a wedge-shaped structure, that is, the shape of the second adjusting segment 1091 is wedge-shaped. Correspondingly, the second adjusting hole segment 10161 is a wedge-shaped hole, so that the second adjusting segment 1091 is wedge-shaped with the second adjusting hole segment 10161.

[0166] By adopting the above scheme, the second adjusting segment 1091 can be wedge-shaped matched with the second adjusting hole segment 10161, so as to accurately adjust the distance between the first needle body 1011 and the second needle body 1012 by adjusting the matching position of the second adjusting segment 1091 and the second adjusting hole segment 10161, and accurately adjust the circumference of the needle 101. Moreover, since the second adjusting segment 1091 and the second adjusting hole segment 10161 can form a surface contact, the contact between the second adjusting segment 1091 and the second adjusting hole segment 10161 can be smooth, the distance between the first needle body 1011 and the second needle body 1012 can be smoothly changed, and can be kept stable after adjustment, so that the needle 101 can be smoothly rotated and the winding operation can be smoothly performed at the adjusted circumference, the risk of the electrode assembly 12 formed by the winding operation due to the change of the circumference of the needle 101 during the winding operation can be effectively reduced, and the qualified rate of the electrode assembly 12 formed by the winding device 10 can be effectively improved.

[0167] Please refer to Figure 1 、 Figure 2 、 Figure 10 Some embodiments of the present application provide a winding system, which comprises the winding device 10 provided by the embodiments of the present application.

[0168] By adopting the above scheme, the winding system can form the electrode assembly 12 by the winding device 10 provided by the embodiments of the present application, and when the ear dislocation phenomenon of the last electrode assembly 12 formed by the winding device 10 is found, the circumference of the needle 101 of the winding device 10 can be adjusted according to the ear dislocation amount of the last electrode assembly 12, and the next electrode assembly 12 can be continuously formed by the adjusted winding device 10, so as to reduce the ear dislocation amount, and even eliminate the ear dislocation phenomenon, thereby effectively improving the production efficiency and product quality of the winding operation, and effectively reducing the cost loss of the winding operation.

[0169] Please refer to Figure 1 、 Figure 2 、 Figure 10 In some embodiments of the present application, the winding system is used to wind the first tab 20, the diaphragm 40 and the second tab 30 to form the electrode assembly 12, and the winding system further comprises a first detection device 60 for detecting the ear of the first tab 20 and / or the second tab 30.

[0170] It should be noted that the first electrode 20 and the second electrode 30 have opposite polarities; one of the first electrode 20 and the second electrode 30 is a positive electrode, and the other is a negative electrode. Both the first electrode 20 and the second electrode 30 are continuous electrodes, and the diaphragm 40 is a continuous diaphragm. Two diaphragms 40 are provided. Before winding, one diaphragm 40 is placed between the first electrode 20 and the second electrode 30, and the other diaphragm 40 is placed on the side of the first electrode 20 away from the second electrode 30, or on the side of the second electrode 30 away from the first electrode 20. Based on this, during winding, the winding device 10 can wind the first electrode 20, the diaphragm 40, and the second electrode 30 to form the electrode assembly 12. Furthermore, the two diaphragms 40 can separate the first electrode 20 and the second electrode 30 to prevent direct contact between the first electrode 20 and the second electrode 30, which could cause a short circuit. The diaphragm 40 has several pores that allow active ions (such as lithium ions) generated by the first electrode 20 and the second electrode 30 to pass through freely.

[0171] It should also be noted that, in one possible implementation, the winding system is equipped with a first detection device 60, which is located on the transport path of the first electrode 20 and is used to identify and detect the tabs of the first electrode 20 as they pass by. This facilitates the detection of whether the first electrode 20 has misaligned tabs.

[0172] In another possible implementation, the winding system includes a first detection device 60, which is positioned on the transport path of the second electrode 30 to identify and detect the tabs of the second electrode 30 as they pass by. This facilitates the detection of whether the second electrode 30 has misaligned tabs.

[0173] like Figure 10 As shown, in another possible implementation, the winding system includes two first detection devices 60. One first detection device 60 is positioned on the transport path of the first electrode 20 and is used to identify and detect the tabs of the first electrode 20 as they pass by. The other first detection device 60 is positioned on the transport path of the second electrode 30 and is used to identify and detect the tabs of the second electrode 30 as they pass by. This facilitates the detection of whether there is tab misalignment between the first electrode 20 and the second electrode 30.

[0174] By adopting the above scheme, the first detection device 60 can be used to identify and detect the tabs of the first tab sheet 20 to measure whether the first tab sheet 20 has tab misplacement, and / or identify and detect the tabs of the second tab sheet 30 to measure whether the second tab sheet 30 has tab misplacement. Based on this, the tab misplacement amount of the current electrode assembly 12 can be detected in real time during the winding of the winding device 10 to form the electrode assembly 12, so that the winding device 10 can adjust the circumference of the winding needle 101 according to the tab misplacement amount of the previous electrode assembly 12 to wind the next electrode assembly 12, thereby adjusting the tab misplacement amount of the next electrode assembly 12 in time, effectively improving the production efficiency and product quality of the winding operation, and effectively reducing the cost loss of the winding operation.

[0175] Please refer to Figure 1 , Figure 10 In some embodiments of the present application, the winding system further comprises four unwinding devices 50 arranged in sequence along the circumference of the winding device 10, and the four unwinding devices 50 are respectively used to deliver the first tab sheet 20, the second tab sheet 30 and the two diaphragms 40 to the winding device 10.

[0176] It should be noted that the four unwinding devices 50 are arranged in sequence along the circumference of the winding device 10. The four unwinding devices 50 can be of the same structure or different structures, and the present embodiment does not limit this. The present embodiment does not limit the specific structure of the unwinding device 50.

[0177] Among the four unwinding devices 50, one unwinding device 50 is used to deliver a continuous first tab sheet 20 to the winding device 10, one unwinding device 50 is used to deliver a continuous second tab sheet 30 to the winding device 10, and the remaining two unwinding devices 50 are respectively used to deliver two continuous diaphragms 40 to the winding device 10. Based on this, the automatic delivery of the tab sheet can be achieved, and the winding device 10 can wind the first tab sheet 20, the diaphragm 40 and the second tab sheet 30 to form the electrode assembly 12, thereby effectively improving the production efficiency of the winding operation.

[0178] Please refer to Figure 1 , Figure 11 In some embodiments of the present application, the winding system further comprises a second detection device 70 for detecting the thickness of the first tab sheet 20 and / or the second tab sheet 30 and / or the diaphragm 40.

[0179] ​It should be noted that the second detection device 70 can be provided one, for detecting the thickness of one of the first tab 20, the second tab 30 and the two separators 40. The second detection device 70 can also be provided two, for detecting the thickness of two of the first tab 20, the second tab 30 and the two separators 40, respectively. The second detection device 70 can also be provided three, for detecting the thickness of three of the first tab 20, the second tab 30 and the two separators 40, respectively. As shown in Figure 11 the second detection device 70 can also be provided four, for detecting the thickness of the first tab 20, the second tab 30 and the two separators 40, respectively.

[0180] Since the thickness change is one of the factors causing the tab to be misaligned, by adopting the above scheme, the second detection device 70 can detect the thickness change of at least one of the first tab 20, the second tab 30 and the two separators 40, so as to estimate the tab misalignment of the current wound electrode assembly 12. Thus, the subsequent winding device 10 can adjust the circumference according to the tab misalignment of the last electrode assembly 12 to wind the next electrode assembly 12, so as to timely adjust the tab misalignment of the next electrode assembly 12, effectively improve the production efficiency and product quality of the winding operation, and effectively reduce the cost loss of the winding operation.

[0181] Please refer to Figure 12 , some embodiments of the present application provide a winding method, which is realized by the winding device 10 provided by the embodiments of the present application. Please refer to Figure 1 , Figure 5 , Figure 6 , Figure 7 , Figure 10 , the winding method comprises the following steps:

[0182] S1, winding the first positive tab, the first separator, and the first negative tab to form a first electrode assembly by the winding device 10, and obtaining the misalignment amount of the test tab, the test tab being at least part of the tab on the first positive tab and / or the first negative tab. It should be noted that the first positive tab has positive tabs 122, and the first negative tab has negative tabs 123. At least part of the tabs are selected from the positive tabs 122 and the negative tabs 123 as test tabs. The test tabs can all be positive tabs 122, or all be negative tabs 123, or part be positive tabs 122 and part be negative tabs 123. The present embodiment does not limit this. When the winding device 10 winds the first positive tab, the first separator and the first negative tab to form the first electrode assembly, the related detection device (for example, the first detection device 60 provided by the embodiments of the present application) can measure the misalignment amount of the test tab.

[0183] S2, obtain the adjustment amount of the circumference of the winding needle 101 according to the displacement amount. It should be noted that according to the displacement amount of the test tab measured in the S1 step, the relevant device (for example, the terminal system) can calculate the adjustment amount of the circumference of the winding needle 101.

[0184] S3, adjust the distance between the first needle body 1011 and the second needle body 1012 according to the adjustment amount. It should be noted that the S3 step is performed when the first electrode assembly is wound and has been transferred from the winding device 10, at this time, the winding needle 101 of the winding device 10 is in an idle state. According to the adjustment amount of the circumference of the winding needle 101 calculated in the S2 step, the winding device 10 can adjust the distance between the first needle body 1011 and the second needle body 1012 through the first push rod 102 and the second push rod 109, until the circumference of the winding needle 101 is adjusted to the required value.

[0185] S4, the winding device 10 after adjusting the distance winds the second positive electrode sheet, the second separator, and the second negative electrode sheet to form a second electrode assembly. It should be noted that the winding device 10 can continue the winding operation through the winding needle 101 after adjusting the circumference to wind the second positive electrode sheet, the second separator, and the second negative electrode sheet to form a second electrode assembly, so as to adjust the tab position of the second electrode assembly, reduce the tab displacement amount, and even eliminate the tab displacement phenomenon. Among them, the first electrode assembly and the second electrode assembly can refer to any two adjacent electrode assemblies 12 formed by winding, the first electrode assembly refers to the previous electrode assembly 12 formed by winding, and the second electrode assembly refers to the next electrode assembly 12 formed by winding. Moreover, the first electrode assembly and the second electrode assembly do not limit the number of electrode assemblies 12 to only two, as long as the second electrode assembly being wound is taken as the new first electrode assembly, and the S1-S4 steps are cycled, so as to realize batch production of the electrode assemblies 12.

[0186] By adopting the above scheme, the misalignment amount of the test tab can be measured in real time when the first electrode assembly is wound by the winding device 10, and the adjustment amount of the circumference of the winding needle 101 can be obtained according to the misalignment amount of the test tab. Based on this, when it is found that the first electrode assembly wound by the winding device 10 has the tab misalignment phenomenon, the winding device 10 can adjust the distance between the first needle body 1011 and the second needle body 1012 according to the adjustment amount of the circumference of the winding needle 101 after completing the winding work of the first electrode assembly and before starting the winding work of the second electrode assembly, so as to adjust the circumference of the winding needle 101, and then the winding device 10 continues to wind the second electrode assembly by the winding needle 101 with the adjusted circumference, so as to adjust the position of the tab of the second electrode assembly and reduce the misalignment amount of the tab or even eliminate the tab misalignment phenomenon. Therefore, the tab misalignment of the electrode assembly 12 can be directly, effectively, conveniently and quickly adjusted, the qualified rate of the electrode assembly 12 wound by the winding device 10 can be effectively improved, the failure rate and the scrap rate of the electrode assembly 12 wound by the winding device 10 can be effectively reduced, the production efficiency and the product quality of the batch production of the electrode assembly 12 can be effectively improved, and the cost of the batch production of the electrode assembly 12 can be effectively reduced.

[0187] Please refer to Figure 12 , please refer to Figure 1 , Figure 2 , Figure 10 In some embodiments of the present application, the step of obtaining the misalignment amount of the test tab comprises:

[0188] S1.1, obtain a test angle value corresponding to the test tab rotated by the winding needle 101. The test angle value is the angle value of the winding needle 101 rotated from the timing zero point to the detection of the test tab passing through the tab detection device. It should be noted that the tab detection device (for example, the first detection device 60 provided in the embodiments of the present application) is arranged on the movement path of the test tab, and the tab detection device can identify and detect the test tab when the test tab passes through the tab detection device. Based on this, during the winding of the first electrode assembly by the winding device 10, when the tab detection device identifies and detects the test tab, the angle value of the winding needle 101 rotated from the timing zero point to the current time can be recorded. Each test tab corresponds to a test angle value. The timing zero point can be the time when the winding needle 101 is initially rotated to wind the first electrode assembly, or can be other preset time, which is not limited in the embodiments.

[0189] S1.2, compare the test angle value of the test tab with the corresponding reference angle value, obtain the angle difference value of the test tab, and the reference angle value is the angle value of the winding needle 101 when the tab from the timing zero point to the detection position standard passes through the tab detection device. It should be noted that when the winding device 10 winds to form the electrode assembly 12 without tab misplacement phenomenon, the test angle value of the test tab measured during winding is the reference angle value. This reference angle value is recorded as a reference for whether the tab is mislocated. Based on this, by comparing the test angle value of the test tab with the corresponding reference angle value of the test tab, it can be judged whether the test tab has misplacement phenomenon. The angle difference value between the test angle value and the reference angle value can be used to calculate the misplacement amount of the test tab.

[0190] S1.3, obtain the misplacement amount of the test tab according to the angle difference value.

[0191] By adopting the above scheme, during the winding of the winding device 10 to form the first electrode assembly, the angle value of the winding needle 101 from the timing zero point to the current time can be recorded as the test angle value when the tab detection device identifies the detection of the test tab, so as to obtain the misplacement amount of the test tab according to the angle difference value between the test angle value and the reference angle value. Thus, the misplacement amount of the test tab can be obtained directly, effectively, conveniently and quickly, and the circumference can be adjusted according to the misplacement amount by the winding needle 101.

[0192] Please refer to Figure 12 , please refer to Figure 1 , Figure 2 In some embodiments of the present application, in the step of obtaining the misplacement amount of the test tab according to the angle difference value, first, the ratio of the angle difference value to 360° is obtained according to the corresponding angle difference value of the test tab, and then the ratio is multiplied by the circumference of the layer where the test tab is located to obtain the corresponding misplacement amount of the test tab.

[0193] It should be noted that the test tab is the tab of the n th layer of the electrode assembly 12 from inside to outside, the test angle value of the test tab is θ n1 , the corresponding reference angle value is θ n2 , the interlayer thickness of the electrode assembly 12 is T, the circumference of the winding needle 101 is C, and the radius of the winding needle 101 is r.

[0194] Based on this, the corresponding angle difference value of the test tab is the test angle value of the test tab minus the corresponding reference angle value, that is, θ n1 -θ n2 The ratio of the angle difference value to 360° is (θ n1 -θ n2 ) / 360°.

[0195] The radius of the circle layer where the test tab is located (i.e. the radius of the nth circle of the electrode assembly 12) is equal to the thickness of the electrode assembly 12 from the 1st circle to the nth circle plus the radius of the winding needle 101, wherein the thickness of the electrode assembly 12 from the 1st circle to the nth circle is equal to the number of circles multiplied by the interlayer thickness of the electrode assembly 12, so the radius of the circle layer where the test tab is located is nT+r. Correspondingly, the circumference of the circle layer where the test tab is located is 2π(nT+r), i.e. 2πnT+C.

[0196] Based on this, the ratio is multiplied by the circumference of the circle layer where the test tab is located, i.e. the displacement amount X corresponding to the test tab is obtained n = (θ n1 - θ n2 ) / 360° × (2πnT+C).

[0197] By using the above scheme, the displacement amount X corresponding to the test tab can be accurately measured in a direct and quantitative manner based on the angle difference, so that the winding needle 101 can adjust the circumference according to the accurate and quantitative displacement amount.

[0198] Please refer to Figure 12 , please refer to Figure 1 , Figure 2 In some embodiments of the present application, in the step of obtaining the adjustment amount of the circumference of the winding needle 101 according to the displacement amount, the displacement amount of the test tab is divided by the number of circles of the circle layer where the test tab is located to obtain an average displacement amount, and then the average displacement amount is multiplied by an adjustment coefficient to obtain the adjustment amount of the circumference of the winding needle 101.

[0199] It should be noted that when the winding needle 101 performs the winding operation with the adjusted circumference, the length of each circle of the electrode assembly 12 formed by winding will change accordingly. Therefore, the displacement amount X n of the test tab in the nth circle of the electrode assembly 12 from the inside to the outside needs to be divided by the number n of the circle layer where the test tab is located to obtain the average displacement amount (i.e. X n / n), which is the theoretical adjustment amount of the circumference of the winding needle 101.

[0200] In order to continuously optimize the adjustment result according to the on-site situation, the average displacement amount can be multiplied by an adjustment coefficient K to calculate the actual adjustment amount of the circumference of the winding needle 101 (i.e. KX n / n). After the winding operation of the first electrode assembly is completed, and before the winding operation of the second electrode assembly is started, the winding needle 101 can adjust the circumference according to the actual adjustment amount, and then continue to wind the second electrode assembly, and then continue to adjust the circumference of the winding needle 101 according to the tab misalignment amount of the second electrode assembly and increase or decrease the value of the adjustment coefficient. This cycle is repeated, which can continuously optimize the adjustment result and gradually reduce the tab misalignment. Alternatively, the value of the adjustment coefficient K can be 0.2-1.

[0201] By using the above scheme, the adjustment amount of the circumference of the winding needle 101 can be obtained based on the misalignment amount of the test tab in a direct, effective, quantifiable, and continuously optimized manner. The subsequent winding needle 101 can be adjusted according to the calculated adjustment amount, and the tab misalignment of the electrode assembly 12 wound by the adjusted winding needle 101 can be continuously optimized to gradually reduce the tab misalignment.

[0202] The above is only an optional embodiment of the present application and is not intended to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. A winding device, wherein, The winding device comprises: a winding needle comprising a first needle body and a second needle body which are parallel to each other and have an adjustable interval, the winding needle having opposite first and second ends, the first needle body and the second needle body jointly forming a first hole at the first end, at least a part of the first hole being a first adjustable hole section, the first adjustable hole section gradually reducing in radial dimension in a direction close to the second end; a first push rod inserted into the first hole and capable of reciprocating along the axial direction of the winding needle, the first push rod having a first adjustable section matched with the first adjustable hole section; wherein the winding device further comprises: a first support arranged at the first end and fastened to one side of the first needle body away from the second needle body; a second support arranged at the first end and fastened to one side of the second needle body away from the first needle body.

2. The winding device according to claim 1, wherein The width of the first adjustable section gradually reduces in a direction close to the second end.

3. The winding device according to claim 1, wherein The winding device further comprises a first support seat arranged at the first end and sleeved on the outer periphery of the first support and the second support; The winding device further comprises a first elastic member installed between the first support seat and the first support, and / or a second elastic member installed between the first support seat and the second support.

4. The winding device according to any one of claims 1 to 3, wherein The winding device further comprises: a first driver connected to one end of the first push rod away from the winding needle, for driving the first push rod to reciprocate along the axial direction of the winding needle.

5. The winding device according to any one of claims 1-4, wherein, The first hole comprises a first through hole section, the first adjustable hole section and a first containing hole section which are sequentially communicated in a direction close to the second end; The first push rod has a first main section and the first adjustable section arranged at the end of the first main section, and a part of the first main section is inserted into the first through hole section.

6. The winding device according to any one of claims 1-5, wherein, The first adjustable section is in a wedge-shaped structure, the first adjustable hole section is a wedge-shaped hole, and the first adjustable section is wedge-shaped matched with the first adjustable hole section.

7. The winding device according to any one of claims 1-5, wherein, The first needle body and the second needle body jointly form a second hole at the second end, at least a part of the second hole being a second adjustable hole section, the second adjustable hole section gradually reducing in radial dimension in a direction close to the first end; the winding device further comprises: a second push rod inserted into the second hole and capable of reciprocating along the axial direction of the winding needle, the second push rod having a second adjustable section matched with the second adjustable hole section.

8. The winding device according to claim 7, wherein The width of the second adjustable section gradually reduces in a direction close to the first end.

9. The winding device according to claim 7, wherein The winding device further comprises: a second support seat, the second support seat being provided with a third hole on one side close to the winding needle, the bottom of the third hole being provided with a through fourth hole, the third hole being used for inserting the second end of the winding needle therein, and the fourth hole being used for inserting the second push rod therein.

10. The winding device according to claim 9, wherein The winding device further comprises: a third elastic member installed in the third hole and sleeved on the outer periphery of the second end of the winding needle.

11. The winding device according to any one of claims 7-10, wherein, The winding device further comprises: a second driver connected to one end of the second push rod away from the winding needle, for driving the second push rod to reciprocate along the axial direction of the winding needle.

12. The winding device according to any one of claims 7-11, wherein, The second hole comprises a second through hole section, the second adjusting hole section and a second containing hole section which are sequentially communicated in the direction close to the first end; The second push rod has a second main body section and the second adjusting section arranged at the end of the second main body section, and the second main body section is partially arranged in the second through hole section.

13. The winding device according to any one of claims 7-12, wherein, The second adjusting section is a wedge-shaped structure, the second adjusting hole section is a wedge-shaped hole, and the second adjusting section is wedge-shaped matched with the second adjusting hole section.

14. A winding system, wherein, The winding device comprises any one of claims 1-13.

15. The winding system of claim 14, wherein, The winding system is used for winding a first pole piece, a separator and a second pole piece to form an electrode assembly, and further comprises a first detection device for detecting a tab of the first pole piece and / or the second pole piece.

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