Coil pin fixing device, winding apparatus, and method of manufacturing electrode assembly

Abstract

The application discloses a winding needle fixing device, a winding device and a preparation method of an electrode assembly. The winding needle fixing device comprises a clamping mechanism and a stretching mechanism. The clamping mechanism is used for clamping or releasing the end of the winding needle. The stretching mechanism is connected with the clamping mechanism, and is configured to exert a pulling force on the clamping mechanism when the clamping mechanism clamps the end of the winding needle, so as to exert a pulling force on the winding needle. The technical scheme provided by the application can allow the winding needle to have a faster winding speed, and improve the production efficiency of the electrode assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular, to a winding needle fixing device, a winding device and a preparation method of an electrode assembly. BACKGROUND

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

[0003] In battery production, the winding electrode assembly is formed by winding the pole piece and the diaphragm by the winding needle. The winding speed directly affects the production efficiency of the electrode assembly and the battery. However, in the prior art, simply increasing the winding speed can easily cause the quality of the produced electrode assembly to be unqualified. SUMMARY

[0004] In view of the above problems, the present application provides a winding needle fixing device, a winding device and a preparation method of an electrode assembly, which can allow the winding needle to have a faster winding speed and improve the production efficiency of the electrode assembly.

[0005] In a first aspect, the present application provides a winding needle fixing device, comprising: a clamping mechanism for clamping or releasing the end of the winding needle; a stretching mechanism connected with the clamping mechanism, the stretching mechanism being configured to apply a pulling force to the clamping mechanism when the clamping mechanism clamps the end of the winding needle, so as to apply a pulling force to the winding needle.

[0006] In the technical solution of the present application, one end of the winding needle is installed in the mounting seat, and the other end is clamped by the clamping mechanism. The stretching mechanism applies a pulling force to the clamping mechanism when the clamping mechanism clamps the end of the winding needle, so as to apply a pulling force to the end of the winding needle through the clamping mechanism, tension the winding needle, reduce the deflection deformation of the winding needle, ensure the winding quality of the electrode assembly, and allow the winding speed to be improved, thereby improving the production efficiency of the electrode assembly.

[0007] In some embodiments, the clamping mechanism comprises: a housing having an opening for the winding needle to extend into; a clamping component disposed in the housing and rotatably connected to the housing around the axis of the winding needle, the clamping component being used to clamp or release the end of the winding needle; and the stretching mechanism is connected with the housing.

[0008] The end of the winding needle extends into the interior of the housing through the opening and is clamped by the clamping component. The stretching mechanism is pulled to tension the winding needle. By rotatably connecting the clamping component to the housing around the axis of the winding needle, the clamping component can actively rotate to match the rotation of the winding needle or be driven to rotate by the winding needle, while the housing and the stretching mechanism do not need to rotate with the winding needle, which can effectively reduce the manufacturing cost of the winding needle fixing device and the running cost of winding.

[0009] In some embodiments, the clamping assembly comprises a transmission member and a plurality of clamping members distributed around the axis of the winding needle, each clamping member being wedge-shaped matched with the transmission member; the clamping mechanism further comprises a first driving unit arranged in the housing, the first driving unit being configured to drive the transmission member to move along the axis of the winding needle so as to make the plurality of clamping members converge radially along the radial direction of the winding needle, thereby clamping the end of the winding needle.

[0010] The first driving unit drives the transmission member to move along the axis of the winding needle, and since the transmission member is wedge-shaped matched with the clamping members, the transmission member can efficiently make all the clamping members converge radially and ensure the clamping force of the clamping members on the end of the winding needle; at the same time, the transmission mode between the transmission member and the clamping members is simple, which can ensure the efficiency of power transmission and reduce the design difficulty of the transmission member and the clamping members.

[0011] In some embodiments, the clamping assembly further comprises a base rotatably mounted in the housing around the axis of the winding needle, and the transmission member is movably mounted in the base along the axis of the winding needle.

[0012] The base rotatable around the axis of the winding needle can make the transmission member rotate around the axis of the winding needle while moving along the axis of the winding needle, thereby synchronously rotating with the winding needle.

[0013] In some embodiments, the transmission member is arranged in the base along the axis of the winding needle, one end of the transmission member is wedge-shaped matched with the plurality of clamping members, and the other end of the transmission member is connected with the first driving unit.

[0014] The transmission member is located between the clamping members and the first driving unit along the axis of the winding needle, and under the drive of the first driving unit, the transmission member can drive the clamping members to converge radially along the winding needle in the shortest path, thereby quickly clamping the winding needle; at the same time, the clamping members, the transmission member and the first driving unit are arranged along the axis of the winding needle, which can facilitate the spatial layout of each structure in the clamping mechanism.

[0015] In some embodiments, the base is provided with a plurality of guide grooves, the plurality of guide grooves are spaced apart along the circumferential direction of the base, each guide groove extends along the axial direction of the base, the transmission member comprises a connecting portion and a plurality of transmission portions, the transmission portions are correspondingly arranged with the guide grooves, each transmission portion is slidably arranged in the corresponding guide groove, one end of each transmission portion is wedge-shaped matched with the corresponding clamping member, the other end of each transmission portion is connected with the connecting portion, and the connecting portion is connected with the first driving unit.

[0016] The plurality of transmission portions are slidably arranged in the corresponding guide grooves, and the first driving unit can simultaneously drive all the transmission portions to slide through the connecting portion, so that all the clamping members synchronously converge radially along the winding needle under the action of the corresponding transmission portions, thereby ensuring the clamping effect and the clamping coaxiality of the winding needle.

[0017] In some embodiments, the clamping assembly further comprises a base rotatably mounted in the housing around the axis of the winding needle, the base being configured to abut against the clamping pieces to limit axial movement of the clamping pieces along the winding needle.

[0018] The base rotatable around the axis of the winding needle ensures that the clamping pieces are rotatable around the axis of the winding needle while limiting axial movement of the clamping pieces along the winding needle, so as to avoid the situation that the clamping pieces are not clamped to the winding needle due to the deviation of the clamping pieces caused by the wedge-shaped fitting of the transmission piece during transmission.

[0019] In some embodiments, one end surface of the base is provided with a receiving groove, and a portion of each clamping piece is located in the receiving groove and another portion is located outside the receiving groove and wedge-shaped fitted with the transmission piece.

[0020] The structure of the base is simple and easy to manufacture. A portion of the clamping piece abuts in the receiving groove, and when the transmission piece moves axially along the winding needle, the clamping piece can be easily driven to slide along the receiving groove in the radial direction, thereby achieving clamping of the clamping piece to the winding needle.

[0021] In some embodiments, the clamping mechanism further comprises a bearing, and the base is mounted in the housing through the bearing.

[0022] The bearing can smoothly rotate the base in the housing, ensuring the stability of the winding needle during winding.

[0023] In some embodiments, one of the base and the bearing is provided with a limiting protrusion, and the other is provided with a limiting groove, and the limiting protrusion and the limiting groove are matched to limit the axial movement of the base along the winding needle.

[0024] The limiting protrusion and the limiting groove are matched between the base and the bearing, and the limiting of the base in the axial direction of the winding needle can prevent the base from being displaced due to the movement of the transmission piece, thereby ensuring that the clamping piece can smoothly clamp the winding needle.

[0025] In some embodiments, the clamping assembly further comprises an elastic piece configured to apply an elastic force to the plurality of clamping pieces to radially expand the plurality of clamping pieces, thereby loosening the end of the winding needle.

[0026] When the first driving unit drives the transmission piece to retreat, i.e., the transmission piece no longer acts on the clamping piece, the plurality of clamping pieces can radially expand under the action of the elastic piece, thereby loosening the winding needle, facilitating the extraction of the winding needle.

[0027] In some embodiments, the clamping mechanism further comprises a connecting seat arranged in the housing, the first driving unit is connected to the connecting seat for driving the connecting seat to move axially along the winding needle; and a second driving unit fixed to the connecting seat and connected to the transmission piece, the second driving unit being configured to drive the transmission piece to rotate around the axis of the winding needle.

[0028] The first driving unit drives the transmission member to drive the clamping member to clamp the winding needle, the second driving unit drives the transmission member and the clamping member to rotate actively, so that the rotation speed of the two ends of the winding needle is consistent, the winding quality of the electrode assembly is ensured, and the problem of needle breakage caused by excessive torsion on one end of the winding needle is solved.

[0029] In some embodiments, the clamping mechanism further comprises a guide rod fixed in the housing and extending in parallel with the axial direction of the winding needle, and the connecting seat is slidably sleeved on the guide rod.

[0030] The guide rod is arranged, so that the base moves stably along the axial direction of the winding needle under the driving of the first driving unit, and the transmission member drives the clamping member to fold along the radial direction smoothly.

[0031] In some embodiments, the clamping mechanism further comprises a second driving unit arranged in the housing, and the second driving unit is used to drive the clamping assembly to rotate around the axis of the winding needle.

[0032] The second driving unit provides a torque, so that the rotation speed of the two ends of the winding needle is consistent, the winding quality of the electrode assembly is ensured, and the problem of needle breakage caused by excessive torsion on one end of the winding needle is solved.

[0033] In some embodiments, the clamping assembly comprises a plurality of clamping members, and each clamping member has a first inclined surface used to abut against the end of the winding needle.

[0034] The end of the winding needle is sharp, and the first inclined surface of the clamping member can effectively abut against the inclined surface of the end of the winding needle, so that all the clamping members abut against the acting surface of the end of the winding needle when folded, the winding needle is effectively clamped, and the clamping mechanism is prevented from slipping off the winding needle when the winding needle is pulled.

[0035] In some embodiments, the clamping assembly comprises a plurality of clamping members, and each clamping member is provided with a protrusion embedded in a recess arranged at the end of the winding needle.

[0036] The protrusion and the recess arranged between the clamping member and the end of the winding needle enable the clamping member to firmly bite the winding needle when clamping the end of the winding needle, so that the clamping force of the clamping member on the end of the winding needle is ensured, and the clamping mechanism is prevented from slipping off the winding needle when the winding needle is pulled.

[0037] In a second aspect, the present application provides a winding device, comprising: a mounting seat; a winding needle, one end of the winding needle being mounted on the mounting seat; and the winding needle fixing device of any one of the foregoing embodiments, the clamping mechanism being used to clamp the other end of the winding needle.

[0038] In the implementation process, the mounting base is connected with one end of the winding needle and drives the winding needle to perform winding operation. The clamping mechanism clamps the other end of the winding needle, and the stretching mechanism applies tension to the winding needle, which can effectively improve the rigidity of the winding needle, reduce the deflection deformation of the winding needle, and ensure the winding quality of the electrode assembly.

[0039] In a third aspect, the present application provides a winding device, comprising a mounting base, a winding needle, one end of the winding needle being mounted on the mounting base, and a stretching mechanism configured to apply tension to the winding needle at the other end of the winding needle.

[0040] In the implementation process, the stretching mechanism applies tension to the winding needle, which can effectively improve the rigidity of the winding needle, reduce the deflection deformation of the winding needle, and ensure the winding quality of the electrode assembly.

[0041] In a fourth aspect, the present application provides a method for manufacturing an electrode assembly, comprising:

[0042] Applying tension to the end of the winding needle;

[0043] Rotating the winding needle to wind the electrode plate and the separator stacked to form an electrode assembly.

[0044] In the implementation process, tension is applied to the end of the winding needle to improve the rigidity of the winding needle. When the winding needle is rotated to wind the electrode plate and the separator stacked, the deflection deformation of the winding needle can be effectively reduced, and the winding effect of the electrode assembly can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0046] Figure 1 Design idea schematic diagram of the winding needle fixing device provided by the present application;

[0047] Figure 2 Schematic diagram of the winding needle fixing device of some embodiments of the present application;

[0048] Figure 3 Internal structure diagram of the clamping mechanism of some embodiments of the present application;

[0049] Figure 4 Structure schematic diagram of the clamping mechanism of some embodiments of the present application;

[0050] Figure 5 Partial sectional view of the clamping mechanism of some embodiments of the present application;

[0051] Figure 6 Fig. 1 1 1 is a schematic view of a base of the present application; Figure 5 Fig. 1 1 1 is a schematic view of a base of the present application;

[0052] Figure 7 Fig. 1 1 1 is a schematic view of a base of the present application;

[0053] Figure 8 Fig. 1 1 1 is a schematic view of a base of the present application;

[0054] Figure 9 Fig. 1 1 1 is a schematic view of a base of the present application;

[0055] Figure 10 Fig. 1 1 1 is a schematic view of a base of the present application; Figure 8 Fig. 1 1 1 is a schematic view of a base of the present application;

[0056] Figure 11 Fig. 1 1 1 is a schematic view of a base of the present application;

[0057] Figure 12 Fig. 1 1 1 is a schematic view of a base of the present application;

[0058] Figure 13 Fig. 1 1 1 is a schematic view of a base of the present application;

[0059] Figure 14 Fig. 1 1 1 is a schematic view of a base of the present application;

[0060] Figure 15 Fig. 1 1 1 is a schematic view of a base of the present application;

[0061] Figure 16 Fig. 1 1 1 is a schematic view of a base of the present application;

[0062] Icon: 10 - winding pin; 11 - mounting seat; 12 - front support; 13 - winding pin fixing device; 20 - clamping mechanism; 21 - shell; 22 - clamping assembly; 23 - first driving unit; 24 - bearing; 25 - connecting seat; 26 - second driving unit; 27 - guide rod; 28 - first support plate; 29 - second support plate; 30 - stretching mechanism; 40 - baffle; 210 - opening; 220 - transmission piece; 221 - clamping piece; 222 - base; 223 - elastic piece; 2200 - connecting part; 2201 - transmission part; 2202 - second inclined surface; 2203 - disc-shaped block; 2204 - wedge-shaped groove; 2210 - third inclined surface; 2211 - wedge-shaped block; 2212 - small section; 2213 - large section; 2214 - helical tooth structure; 2215 - block structure; 2220 - guide groove; 2221 - sleeve; 2222 - containing groove; 2223 - support block; 2224 - sliding groove; 2225 - limiting protrusion. DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0064] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0065] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0066] In the description of the embodiments of the present application, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and are not intended to 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.

[0067] In the description of the embodiments of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside 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.

[0068] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0069] The technical solutions in the present application will be described below with reference to the drawings.

[0070] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system such as hydroelectric power station, thermal power station, wind power station and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0071] In the production of battery, the winding electrode assembly is formed by winding the pole piece and the diaphragm with the winding needle, and the winding speed directly affects the production efficiency of the electrode assembly and the battery. However, in the prior art, simply improving the winding speed is easy to cause the unqualified quality of the produced electrode assembly.

[0072] The inventor found that the reason for the above problems is that the rigidity of the winding needle is insufficient. The winding needle may be deflected and deformed under the influence of its own weight, and the winding needle will also be affected by the tension of the pole piece and the diaphragm during winding, so that the deformation of the winding needle is greatly increased. In this case, the electrode assembly produced by winding will have various quality problems. In order to produce qualified electrode assembly under this condition, the winding speed must be reduced, which greatly reduces the production efficiency of the battery.

[0073] Based on the above consideration, in order to meet the demand of improving the winding speed and solve the problem of low winding quality caused by insufficient rigidity of the winding needle, the inventor has found that:

[0074] According to the deflection deformation of the beam, when there is no pre-tightening tension, that is, one end of the winding needle is connected with the mounting seat (the mounting seat can drive the winding needle to rotate to produce the electrode assembly), and the other end is in free state, the deformation of the winding needle is a cantilever beam with one end fixed, and its deflection deformation formula is: When the pre-tightening tension is applied to the other end of the winding needle, that is, one end of the winding needle is connected with the mounting seat, and the other end is fixed and provides tension, its deflection deformation formula is: (Where F is the resultant force of the membrane tension and the weight of the needle, L is the length of the needle, E is the elastic modulus of the needle, and D is the diameter of the needle); according to the above two formulas, increasing the pre-tightening tension is equivalent to 20% of the deformation of a cantilever beam with one end fixed, so that the rigidity of the needle can be significantly increased after the pre-tightening tension is increased, thereby improving the winding speed and quality of the electrode assembly.

[0075] To this end, the inventors propose a design idea, as shown in Figure 1 , Figure 1 A schematic diagram of the needle fixing device 13 provided in the present application is shown. One end of the needle 10 is fixed to the mounting seat 11, and the other end of the needle 10 is inserted into the front support 12. The mounting seat 11 can drive the needle 10 to rotate around the axis of the needle 10 to wind the electrode assembly formed by the polar plates and the diaphragm stacked on the needle 10. Considering that the end of the needle 10 is inserted into the front support 12, the needle 10 has a high degree of freedom and can move forward and backward along the direction in which the needle 10 is inserted. The needle 10 will be deformed and bent under the action of external force and gravity, and the end of the needle 10 will displace in the front support 12. Therefore, clamping the end of the needle 10 away from the mounting seat 11 can prevent the needle 10 from being deformed too much, and an axial tension N is applied to the needle 10 to stretch the needle 10. When the needle 10 is deformed under the action of the resultant force F of the membrane tension and the weight, the tension N will generate two components. The component N1 is opposite to the direction of the resultant force F, and the component N2 is in the direction in which the needle 10 moves forward and backward. At this time, the component N1 will offset a part of the resultant force F, thereby reducing the influence of the membrane tension and the weight on the deformation of the needle 10. Thus, the winding speed and quality of the electrode assembly are ensured.

[0076] Based on the above design idea, some embodiments of the present application provide a needle fixing device 13. As shown in Figure 2 , Figure 2 A schematic diagram of the needle fixing device 13 of some embodiments of the present application is shown.

[0077] The needle fixing device 13 includes a clamping mechanism 20 and a stretching mechanism 30. The clamping mechanism 20 is used to clamp or loosen the end of the needle 10. The stretching mechanism 30 is connected to the clamping mechanism 20, and the stretching mechanism 30 is configured to apply a tension to the clamping mechanism 20 when the clamping mechanism 20 clamps the end of the needle 10, so as to apply a tension to the needle 10. The direction of N in the figure is the direction in which the stretching mechanism 30 applies the tension to the needle 10.

[0078] The end of the winding needle 10 includes an end of the winding needle 10 away from the mounting base 11, and the mounting base 11 is connected with one end of the winding needle 10 and can drive the winding needle 10 to rotate to wind the pole piece and the diaphragm arranged in layers to form an electrode assembly. In the actual working state, the winding needle 10 is between the mounting base 11 and the clamping mechanism 20, and the two ends of the winding needle 10 are fixed through the mounting base 11 and the clamping mechanism 20 respectively, and the stretching mechanism 30 applies a pulling force to the winding needle 10 through the clamping mechanism 20 to improve the rigidity of the winding needle 10 and reduce the influence of the diaphragm (the pole piece and the diaphragm arranged in layers) tension and the self-weight of the winding needle 10 on the deformation of the winding needle 10. It can be understood that the clamping mechanism 20 includes a power device that can make a clamping action, and the power source is not limited to a commonly used motor, cylinder or electro-pneumatic power element. The stretching mechanism 30 includes a power device that provides a pulling force traction, and the power source is not limited to a commonly used motor, cylinder or electro-pneumatic power element.

[0079] In the above-mentioned implementation process, the stretching mechanism 30 applies a pulling force to the winding needle 10 when the clamping mechanism 20 clamps the end of the winding needle 10, tensioning the winding needle 10, reducing the deflection deformation of the winding needle 10, ensuring the winding quality of the electrode assembly, and allowing the winding speed to be improved, improving the production efficiency of the electrode assembly.

[0080] According to some embodiments of the present application, optionally, please combine Figure 3 , Figure 3 The internal structure diagram of the clamping mechanism 20 of some embodiments of the present application is shown. The clamping mechanism 20 includes a housing 21 and a clamping assembly 22, and the housing 21 has an opening 210 for the winding needle 10 to extend into. The clamping assembly 22 is arranged in the housing 21 and is rotatably connected to the housing 21 around the axis of the winding needle 10. The clamping assembly 22 is used to clamp or release the end of the winding needle 10. The stretching mechanism 30 is connected with the housing 21.

[0081] The clamping assembly 22 is connected with the housing 21, that is, when the stretching mechanism 30 applies a pulling force to the housing 21, the pulling force can act on the clamping assembly 22, so that the stretching mechanism 30 can apply a pulling force to the winding needle 10 clamped by the clamping assembly 22. The clamping assembly 22 is arranged in the interior of the housing 21 and can rotate relative to the housing 21 around the axis of the winding needle 10, that is, when the clamping assembly 22 clamps the winding needle 10, it can follow the winding needle 10 to rotate, ensuring that the winding needle 10 makes a winding action. The end of the winding needle 10 extends into the interior of the housing 21 through the opening 210 of the housing 21, and the part of the winding needle 10 extending into the interior of the housing 21 can be clamped and fixed by the clamping assembly 22.

[0082] The end of the coil needle 10 extends into the interior of the housing 21 through the opening 210 and is clamped by the clamping assembly 22. The tensioning mechanism 30 pulls the housing 21 to tension the coil needle 10. By designing the clamping assembly 22 to be rotatably connected to the housing 21 around the axis of the coil needle 10, the clamping assembly 22 can actively rotate to match the rotation of the coil needle 10 or be driven to rotate by the coil needle 10. The housing 21 and the tensioning mechanism 30 do not need to rotate with the coil needle 10, which can effectively reduce the manufacturing cost of the coil needle fixing device 13 and the operating cost of winding.

[0083] According to some embodiments of this application, optionally, please refer to... Figures 4-6 , Figure 4 This is a schematic diagram of the clamping mechanism 20 in some embodiments of this application. Figure 5 This is a partial cross-sectional view of the clamping mechanism 20 according to some embodiments of this application. Figure 6 for Figure 5 Enlarged view at point VI. The clamping assembly 22 includes a transmission member 220 and a plurality of clamping members 221, which are distributed around the axis of the coil needle 10. Each clamping member 221 is wedge-shapedly engaged with the transmission member 220. The clamping mechanism 20 further includes a first driving unit 23 disposed within the housing 21. The first driving unit 23 is used to drive the transmission member 220 to move axially along the coil needle 10, so that the plurality of clamping members 221 close radially along the coil needle 10, thereby clamping the end of the coil needle 10.

[0084] The number of clamping members 221 can be two or more, thereby providing a clamping force on the coil needle 10 in the radial direction to firmly clamp the coil needle 10. Optionally, there are two clamping members 221, one clamping member 221 providing a clamping force on the upper surface of the coil needle 10 and the other clamping member 221 providing a clamping force on the lower surface of the coil needle 10. The two clamping forces are collinear and pass through the center of the coil needle 10, thereby enabling stable clamping of the coil needle 10. Optionally, a baffle 40 can be provided between the clamping members 221. The baffle 40 is inserted between two parts of the coil needle 10 to prevent the gap between the coil needles 10 from becoming smaller and deforming into an ellipse when the clamping members 221 clamp the coil needle, thus affecting the winding quality. See also Figure 6 "Wedge fit" refers to the fact that the working surface between the clamping member 221 and the transmission member 220 is an inclined plane. When the first drive unit 23 drives the clamping member 221 to move along the axis of the coiling needle 10, the clamping member 221 will push the transmission member 220 to move radially toward the coiling needle 10 along the working surface, thereby making a radial closing action and clamping the coiling needle 10. It is understood that the first drive unit 23 may include a device capable of outputting linear motion, such as a cylinder or a linear motor. Of course, in other embodiments, the clamping assembly 22 can be other devices capable of performing clamping actions, such as a robotic arm or a gripper.

[0085] The first driving unit 23 works to drive the transmission member 220 to move along the axis of the winding needle 10. Since the transmission member 220 is in wedge-shaped cooperation with the clamping members 221, the transmission member 220 can efficiently make all the clamping members 221 radially close, and ensure the clamping force of the clamping members 221 on the end of the winding needle 10. Meanwhile, the transmission mode between the transmission member 220 and the clamping members 221 is simple, which can ensure the efficiency of power transmission and reduce the design difficulty of the transmission member 220 and the clamping members 221.

[0086] According to some embodiments of the present application, optionally, referring to Figure 5 The clamping assembly 22 further comprises a base 222 rotatably mounted in the housing 21 around the axis of the winding needle 10, and the transmission member 220 is movably mounted in the base 222 along the axis of the winding needle 10.

[0087] The transmission member 220 is mounted in the base 222 and supported by the base 222 to move along the axis of the winding needle 10 to act on the clamping members 221, thereby driving the clamping members 221 to radially close. The base 222 is mounted in the housing 21 and can rotate around the axis of the winding needle 10, so that the transmission member 220 can rotate around the axis of the winding needle 10 under the support of the base 222 to match the rotation of the winding needle 10 or be driven to rotate by the winding needle 10.

[0088] By providing the base 222 rotatable around the axis of the winding needle 10, the transmission member 220 can rotate around the axis of the winding needle 10 while moving along the axis of the winding needle 10, thereby synchronously rotating with the winding needle 10 to ensure the normal operation of the winding needle 10.

[0089] According to some embodiments of the present application, optionally, referring to Figure 5 The transmission member 220 is movably arranged in the base 222 along the axis of the winding needle 10, one end of the transmission member 220 is in wedge-shaped cooperation with the plurality of clamping members 221, and the other end of the transmission member 220 is connected with the first driving unit 23.

[0090] In the axis of the winding needle 10, the transmission member 220 is located between the clamping members 221 and the first driving unit 23, i.e., the three are arranged along the axis of the winding needle 10.

[0091] By arranging the transmission member 220 between the clamping members 221 and the first driving unit 23 along the axis of the winding needle 10, the transmission member 220 can drive the clamping members 221 to radially close along the winding needle 10 in the shortest path under the driving of the first driving unit 23, thereby quickly clamping the winding needle 10. Meanwhile, the arrangement of the clamping members 221, the transmission member 220 and the first driving unit 23 along the axis of the winding needle 10 can facilitate the spatial arrangement of the structures in the clamping mechanism 20.

[0092] According to some embodiments of the present application, please refer to Figure 5 , Figure 6 and Figure 7 , Figure 7 is a schematic view of the base 222 of some embodiments of the present application. The base 222 is provided with a plurality of guide slots 2220, which are spaced along the circumference of the base 222 and each extends along the axial direction of the base 222. The transmission member 220 includes a connecting portion 2200 and a plurality of transmission portions 2201, which are provided corresponding to the guide slots 2220, each of the transmission portions 2201 is slidably arranged in the corresponding guide slot 2220, one end of each of the transmission portions 2201 is wedge-shaped matched with the corresponding clamping member 221, and the other end of each of the transmission portions 2201 is connected to the connecting portion 2200, which is connected to the first driving unit 23.

[0093] The number of the guide slots 2220 corresponds to the number of the transmission portions 2201, and each of the transmission portions 2201 can slide in the corresponding guide slot 2220 along the axial direction of the winding needle 10. The number of the transmission portions 2201 is consistent with the number of the clamping members 221, and they are one-to-one correspondence. The end of the transmission portion 2201 away from the first driving unit 23 and towards the wall surface of the clamping member 221 is formed with a second inclined surface 2202, and the wall surface of the clamping member 221 towards the transmission portion 2201 is formed with a third inclined surface 2210. The second inclined surface 2202 abuts against the third inclined surface 2210, so that the matching relationship between the clamping member 221 and the transmission portion 2201 is wedge-shaped matching, and each of the transmission portions 2201 can drive the corresponding clamping member 221 to move in the radial direction of the winding needle 10. All of the transmission portions 2201 are connected to the first driving unit 23 through the connecting portion 2200, that is, when the first driving unit 23 works, it can drive all of the transmission portions 2201 to slide in the corresponding guide slots 2220, so as to drive the corresponding clamping members 221 to move in the radial direction and make all of the clamping members 221 converge in the radial direction, thereby achieving clamping of the winding needle 10.

[0094] Through the connecting portion 2200, the first driving unit 23 can simultaneously drive all of the transmission portions 2201 to slide, so that all of the clamping members 221 are synchronously converged in the radial direction of the winding needle 10 under the action of the corresponding transmission portions 2201, thereby ensuring the clamping effect and clamping coaxiality of the winding needle 10. The clamping coaxiality refers to that when all of the clamping members 221 are converged in the radial direction, the center line of all of the clamping members 221 in the axial direction of the winding needle 10 coincides with the axis of the winding needle 10.

[0095] Optionally, please refer to Figure 8 and Figure 9 , Figure 8 is a sectional view of the clamping mechanism 20 of some embodiments of the present application, Figure 9FIG. 6 is a schematic view of the clamping member 221 and the transmission member 220 according to some embodiments of the present application. The transmission member 220 includes a disc-shaped block 2203, and the disc-shaped block 2203 is formed with wedge-shaped grooves 2204, the number of the wedge-shaped grooves 2204 being consistent with the number of the clamping members 221. The end of the clamping member 221 is formed with a wedge-shaped block 2211, and the wedge-shaped block 2211 is embedded in the corresponding wedge-shaped groove 2204 to achieve the wedge-shaped cooperation between the clamping member 221 and the transmission member 220. The base 222 includes a sleeve 2221, and the transmission member 220 passes through the sleeve 2221 and is wedge-shaped cooperated with the clamping member 221. When the first driving unit 23 works to drive the transmission member 220 to move along the axial direction of the reel, the wedge-shaped groove 2204 will push the wedge-shaped block 2211, so that all the clamping members 221 are radially closed to clamp the end of the needle 10.

[0096] According to some embodiments of the present application, optionally, the clamping assembly 22 further includes a base 222, which is rotatably installed in the housing 21 around the axis of the needle 10, and the base 222 is configured to abut against the clamping member 221 to limit the movement of the clamping member 221 along the axial direction of the needle 10.

[0097] The clamping member 221 abuts against the base 222 in the axial direction of the needle 10, so as to limit the position in the axial direction of the needle 10. When the transmission member 220 moves along the axial direction of the needle 10, it can be ensured that the clamping member 221 does not move in the axial direction of the needle 10, but only moves in the radial direction of the needle 10, so as to clamp or release the end of the needle 10. Since the base 222 is installed in the housing 21 and can rotate around the axis of the needle 10, the clamping member 221 can rotate around the axis of the needle 10 under the support of the base 222 to match the rotation of the needle 10 or be driven to rotate by the needle 10.

[0098] By providing the base 222 which can rotate around the axis of the needle 10, it can be ensured that the clamping member 221 can rotate around the axis of the needle 10 while limiting the movement of the clamping member 221 along the axial direction of the needle 10, so as to avoid the situation that the clamping member 221 is not clamped to the needle 10 due to the deviation of the clamping member 221 caused by the wedge-shaped cooperation during the transmission of the transmission member 220.

[0099] According to some embodiments of the present application, optionally, referring to FIG. 6, the base 222 is provided with a receiving groove 2222 on one end face, and a part of each clamping member 221 is located in the receiving groove 2222 and another part is located outside the receiving groove 2222 and is wedge-shaped cooperated with the transmission member 220. Figure 6

[0100] ​Part of the clamping member 221 is located in the accommodating groove 2222 and the end of the clamping member 221 abuts against the bottom surface of the accommodating groove 2222. In the radial direction of the winding needle 10, the accommodating groove 2222 also has a space in excess so as to facilitate the movement of the clamping member 221 in the radial direction of the winding needle 10, thereby achieving clamping and loosening of the winding needle 10.

[0101] Through the design of the accommodating groove 2222, the structure of the base 222 is simple and convenient for manufacturing. Part of the clamping member 221 abuts in the accommodating groove 2222. When the transmission member 220 moves in the axial direction of the winding needle 10, the clamping member 221 can be easily driven to slide along the bottom surface of the accommodating groove 2222 in the direction of the winding needle 10, thereby achieving clamping of the clamping member 221 to the winding needle 10.

[0102] Optionally, please refer to Figure 8 , Figure 9 and Figure 10 , Figure 10 for the schematic view of the base 222 and the clamping member 221 in the clamping mechanism 20 provided based on Figure 8 . The base 222 includes two support blocks 2223 which are connected to each other to form a disc-like support structure, and the two support blocks 2223 are fixed to the sleeve 2221. The cavity between the two support blocks 2223 accommodates the disc-shaped block 2203 which is wedge-shaped matched with the clamping member 221. The two support blocks 2223 jointly form a sliding groove 2224 in the radial direction of the winding needle 10, and the clamping member 221 is formed with a small section 2212 which is slidingly matched with the sliding groove 2224. The clamping member 221 can be regarded as a large section 2213, a small section 2212 and a wedge-shaped block 2211 which are connected in sequence in the axial direction of the winding needle 10. The large section 2213 is used to provide clamping force to the winding needle 10, and the size of the large section 2213 is greater than that of the sliding groove 2224 so as to abut against the surface of the support block 2223, thereby limiting the movement of the clamping member 221 in the axial direction of the winding needle 10. The small section 2212 is used to enable the clamping member 221 to slide in the radial direction of the winding needle 10, thereby achieving clamping and loosening of the winding needle 10. The wedge-shaped block 2211 is matched with the wedge-shaped groove 2204 of the disc-shaped block 2203, so as to be driven by the transmission member 220, thereby enabling the clamping member 221 to make clamping action.

[0103] Through the above design, the clamping member 221 can be stably moved in the radial direction of the winding needle 10 and effectively limited to move in the axial direction of the winding needle 10, thereby ensuring that the clamping member 221 clamps the winding needle 10 along the correct movement track.

[0104] According to some embodiments of the present application, the clamping mechanism 20 further includes a bearing 24, and the base 222 is installed in the housing 21 through the bearing 24.

[0105] Optionally, please refer to Figure 5The outer ring of the bearing 24 is fixed to the inner wall of the shell 21, and the base 222 is fixed to the inner ring of the bearing 24. The base 222 can rotate around the axis of the winding needle 10 due to the action of the bearing 24, so as to rotate with the winding needle 10.

[0106] Optionally, referring to Figure 8 The outer ring of the bearing 24 is fixed to the inner wall of the shell 21, and the sleeve 2221 of the base 222 is fixed to the inner ring of the bearing 24, so that the base 222 can rotate around the axis of the winding needle 10, so as to rotate with the winding needle 10.

[0107] The base 222 can be smoothly rotated in the shell 21 by the bearing 24, so as to ensure the stability of the winding needle 10 during the winding process.

[0108] According to some embodiments of the present application, optionally, one of the base 222 and the bearing 24 is provided with a limiting protrusion 2225, and the other is provided with a limiting groove, and the limiting protrusion 2225 cooperates with the limiting groove to limit the axial movement of the base 222 along the winding needle 10.

[0109] The limiting protrusion 2225 and the limiting groove have at least two layouts. One layout is that the limiting protrusion 2225 is arranged on the surface of the base 222, and the limiting groove is arranged on the inner ring of the bearing 24. Another layout is that the limiting protrusion 2225 is arranged on the inner ring of the bearing 24, and the limiting groove is arranged on the surface of the base 222. It can be understood that other conceivable layouts are that the surface of the base 222 is provided with the limiting protrusion 2225 and the limiting groove, and the inner ring of the bearing 24 is provided with the limiting groove and the limiting protrusion 2225, the limiting protrusion 2225 of the base 222 cooperates with the limiting groove of the bearing 24, and the limiting groove of the base 222 cooperates with the limiting protrusion 2225 of the bearing 24. Referring to Figure 7 The surface of the base 222 is provided with two limiting protrusions 2225, and correspondingly, the inner ring of the bearing 24 is provided with two limiting grooves (not shown in the figure), so as to effectively limit the axial movement of the base 222 along the winding needle 10.

[0110] The limiting protrusion 2225 and the limiting groove are adopted between the base 222 and the bearing 24, so as to limit the base 222 in the axial direction of the winding needle 10, which can prevent the base 222 from moving in the axial direction of the winding needle 10 due to the movement of the transmission member 220, and ensure that the clamping member 221 can clamp the winding needle 10 smoothly.

[0111] According to some embodiments of the present application, optionally, referring to Figure 11 , Figure 11This is a schematic diagram of clamping member 221 and elastic member 223 in some embodiments of this application. The clamping assembly 22 also includes elastic member 223, which is configured to apply an elastic force to the plurality of clamping members 221 to cause the plurality of clamping members 221 to open radially along the coil needle 10, thereby releasing the end of the coil needle 10.

[0112] The elastic element 223 provides radial elastic force to the clamping elements 221, causing the multiple clamping elements 221 to tend to open radially towards each other. When the first drive unit 23 operates, driving the transmission element 220 to move axially along the needle coil 10, the elastic force of the elastic element 223 must be overcome to allow the clamping elements 221 to close radially and clamp the needle coil 10. When the transmission element 220 does not act on the clamping elements 221, the clamping elements 221 open radially along the needle coil 10, thereby releasing the end of the needle coil 10. Figure 11 As shown, the elastic element 223 includes a plurality of springs disposed at the edges of the two clamping elements 221 to provide radial elastic force to the clamping elements 221.

[0113] When the first drive unit 23 drives the transmission member 220 to retract, and the transmission member 220 no longer acts on the clamping member 221, the multiple clamping members 221 can open radially under the action of the elastic member 223, thereby loosening the coiled needle 10, making it easier to pull out the coiled needle 10, and also preparing for the next insertion of the coiled needle 10.

[0114] According to some embodiments of this application, optionally, see [link to relevant documentation]. Figure 12 and Figure 13 , Figure 12 This is a schematic diagram of the clamping mechanism 20 in some embodiments of this application. Figure 13 This is a cross-sectional view of a clamping mechanism 20 according to some embodiments of this application. The clamping mechanism 20 also includes a connecting seat 25 and a second drive unit 26. The connecting seat 25 is disposed within the housing 21, and the first drive unit 23 is connected to the connecting seat 25 to drive the connecting seat 25 to move axially along the needle coil 10. The second drive unit 26 is fixed to the connecting seat 25 and connected to the transmission member 220, and the second drive unit 26 is used to drive the transmission member 220 to rotate about the axis of the needle coil 10.

[0115] See Figure 13The one end of the connecting seat 25 is rotatably connected with the connecting part 2200 of the transmission part 220, and the rotatable connection form can adopt the form of sleeve plus ball. The connecting part 2200 is supported by the connecting seat 25 to ensure that the transmission part 220 rotates stably around the axis of the winding needle 10. The first driving unit 23 and the second driving unit 26 are connected with the other end of the connecting seat 25. The execution end of the second driving unit 26 passes through the connecting seat 25 and is connected with the connecting part 2200. When the second driving unit 26 works, the connecting part 2200 can be driven to rotate, thereby driving the transmission part 2201, the clamping part 221 and the winding needle 10 to rotate. When the first driving unit 23 works, the connecting seat 25, the transmission part 2201 and the second driving unit 26 can be driven to move along the axis of the winding needle 10, thereby realizing the clamping of the winding needle 10 by the clamping part 221.

[0116] The first driving unit 23 drives the clamping part 221 to clamp the winding needle 10 through the transmission part 220. The second driving unit 26 drives the transmission part 220 and the clamping part 221 to actively rotate, so that the rotation speeds of the two ends of the winding needle 10 are consistent, thereby ensuring the winding quality of the electrode assembly. Meanwhile, the active rotation mode can solve the problem of broken needle caused by excessive torsion on one end of the winding needle 10. By arranging the connecting seat 25, the first driving unit 23 does not need to rotate with the winding needle 10 when the second driving unit 26 realizes the effect of active rotation, thereby effectively controlling the working load of the winding needle fixing device 13 and saving operation cost.

[0117] It can be understood that the second driving unit 26 can include a motor or other device capable of outputting torque.

[0118] It can be understood that, referring to Figure 5 The one end of the connecting seat 25 is rotatably connected with the connecting part 2200 of the transmission part 220, and the rotatable connection form can adopt the form of sleeve plus ball. The connecting part 2200 is supported by the connecting seat 25 to ensure that the transmission part 220 rotates stably around the axis of the winding needle 10. The first driving unit 23 and the second driving unit 26 are connected with the other end of the connecting seat 25. The execution end of the second driving unit 26 passes through the connecting seat 25 and is connected with the connecting part 2200. When the second driving unit 26 works, the connecting part 2200 can be driven to rotate, thereby driving the transmission part 2201, the clamping part 221 and the winding needle 10 to rotate. When the first driving unit 23 works, the connecting seat 25, the transmission part 2201 and the second driving unit 26 can be driven to move along the axis of the winding needle 10, thereby realizing the clamping of the winding needle 10 by the clamping part 221.

[0119] It can be understood that, Figure 8 The clamping mechanism 20 shown can also include a connecting seat 25. The one end of the connecting seat 25 is rotatably connected with the transmission part 220. The first driving unit 23 is connected with the other end of the connecting seat 25 to drive the transmission part 220 to move along the axis of the winding needle 10, and to ensure that the transmission part 220 and the clamping part 221 rotate around the axis of the winding needle 10.

[0120] According to some embodiments of the present application, optionally, referring to Figure 12The clamping mechanism 20 further comprises a guide rod 27 fixed in the housing 21 and extending in parallel with the axial direction of the winding needle 10. The connecting seat 25 is slidably sleeved on the guide rod 27.

[0121] The clamping mechanism 20 further comprises a first support plate 28 and a second support plate 29 fixed in the housing 21 in the axial direction of the winding needle 10. The guide rod 27 is fixed between the first support plate 28 and the second support plate 29 in the axial direction parallel to the winding needle 10, for guiding the connecting seat 25 to move smoothly in the axial direction of the winding needle 10 under the driving of the first driving unit 23. It can be understood that the number of guide plates is not limited, which can be one, two or three, etc., as long as it can guide the connecting seat 25.

[0122] By arranging the guide rod 27, the base 222 can move smoothly in the axial direction of the winding needle 10 under the driving of the first driving unit 23, ensuring that the transmission member 220 smoothly drives the clamping member 221 to fold in the radial direction to clamp the winding needle 10.

[0123] It can be understood that, referring to Figure 12 The first driving unit 23 can comprise a plurality of electric telescopic rods, the plurality of telescopic rods being fixed to the second support plate 29, and the telescopic ends of the telescopic rods being connected with the connecting seat 25, so as to drive the connecting seat 25 to move in the axial direction of the winding needle 10. It can be understood that in other embodiments, the first driving unit 23 can also comprise other devices capable of outputting linear motion, such as a combination of a telescopic rod and a pneumatic cylinder.

[0124] According to some embodiments of the present application, optionally, the clamping mechanism 20 further comprises a second driving unit 26 arranged in the housing 21, the second driving unit 26 being used to drive the clamping assembly 22 to rotate around the axis of the winding needle 10.

[0125] It can be understood that the second driving unit 26 can drive the first driving unit 23, the transmission member 220 and the clamping member 221 to rotate together.

[0126] The second driving unit 26 provides torque, so that the rotation speed of the two ends of the winding needle 10 is consistent, ensuring the winding quality of the electrode assembly; at the same time, the active rotation mode can solve the problem of broken needle caused by excessive torsion on one end of the winding needle 10.

[0127] According to some embodiments of the present application, optionally, the clamping assembly 22 comprises a plurality of clamping members 221, each clamping member 221 having a first inclined surface for abutting with the end of the winding needle 10.

[0128] The end of the winding needle 10 is sharp, and the first inclined surface of the clamping piece 221 can effectively fit the end of the winding needle 10, so that all the clamping pieces 221 can be in contact with the end of the winding needle 10 when the clamping mechanism 20 is closed, thereby effectively clamping the winding needle 10, and avoiding the situation that the clamping mechanism 20 slips off the winding needle 10 when the winding needle 10 is pulled.

[0129] According to some embodiments of the present application, optionally, please refer to Figure 6 , Figure 14 and Figure 15 , Figure 14 Fig. 1 is a schematic view of the clamping piece 221 and the winding needle 10 according to some embodiments of the present application, Figure 15 Fig. 2 is a schematic view of the clamping piece 221 and the winding needle 10 according to some embodiments of the present application. The clamping assembly 22 includes a plurality of clamping pieces 221, and each clamping piece 221 is provided with a protruding portion for embedding into a recess provided at the end of the winding needle 10.

[0130] The protruding portion and the recess are in an embedded relationship, that is, when the clamping piece 221 clamps the end of the winding needle 10, the protruding portion can be embedded in the recess, so that the clamping piece 221 “bites” the winding needle 10, thereby ensuring the clamping effect of the clamping piece 221 on the winding needle 10. See Figure 6 In Figure 6 , the protruding portion of the clamping piece 221 includes a plurality of tooth structures, and the recess of the winding needle 10 includes a plurality of groove structures corresponding to the tooth structures. When the clamping piece 221 clamps the winding needle 10, the plurality of tooth structures are embedded in the plurality of groove structures, thereby improving the clamping effect of the clamping piece 221 on the winding needle 10. See Figure 14 , the protruding portion of the clamping piece 221 includes an inclined tooth structure 2214, and the recess of the winding needle 10 includes an inclined groove structure corresponding to the inclined tooth structure 2214. When the clamping piece 221 clamps the winding needle 10, the inclined tooth structure 2214 is embedded in the inclined groove structure. If the clamping piece 221 is not loosened in the radial direction, the winding needle 10 cannot escape from the clamping piece 221 due to the cooperation of the inclined tooth structure 2214 and the inclined groove structure, thereby improving the clamping effect of the clamping piece 221 on the winding needle 10. See Figure 15 , the protruding portion of the clamping piece 221 includes a block structure 2215, and the recess of the winding needle 10 includes a square groove structure corresponding to the block structure 2215. When the clamping piece 221 clamps the winding needle 10, the block structure 2215 is embedded in the square groove structure. If the clamping piece 221 is not loosened in the radial direction, the winding needle 10 cannot escape from the clamping piece 221 due to the cooperation of the block structure 2215 and the square groove structure, thereby improving the clamping effect of the clamping piece 221 on the winding needle 10.

[0131] By setting the convex part and the concave part between the clamping part 221 and the end of the winding needle 10, the clamping part 221 firmly bites the winding needle 10 when clamping the end of the winding needle 10, ensures the clamping force of the clamping part 221 on the end of the winding needle 10, and avoids the situation that the clamping mechanism 20 slips off the winding needle 10 when the winding needle 10 is pulled.

[0132] According to some embodiments of the present application, the present application also provides a winding device, please refer to Figure 2 , the winding device comprises a mounting seat 11, a winding needle 10 and a winding needle fixing device 13 of any of the above solutions. One end of the winding needle 10 is mounted on the mounting seat 11. The clamping mechanism 20 is used to clamp the other end of the winding needle 10.

[0133] The mounting seat 11 is connected with one end of the winding needle 10 and drives the winding needle 10 to make winding action. The clamping mechanism 20 clamps the other end of the winding needle 10, and the stretching mechanism 30 applies tension to the winding needle 10, which can effectively improve the rigidity of the winding needle 10, reduce the deflection deformation of the winding needle 10, and ensure the winding quality of the electrode assembly.

[0134] According to some embodiments of the present application, the present application also provides a winding device, the winding device comprises a mounting seat 11, a winding needle 10 and a stretching mechanism 30. One end of the winding needle 10 is mounted on the mounting seat 11. And the stretching mechanism 30 is configured to apply tension to the winding needle 10 at the other end of the winding needle 10.

[0135] By applying tension to the winding needle 10 through the stretching mechanism 30, the rigidity of the winding needle 10 can be effectively improved, the deflection deformation of the winding needle 10 can be reduced, the winding quality of the electrode assembly can be ensured, and the winding speed can be allowed to be improved, and the production efficiency of the electrode assembly can be improved. The stretching mechanism 30 needs to be connected with the winding needle 10 to apply tension to the winding needle 10. The connection relationship between the stretching mechanism 30 and the winding needle 10 is not limited to the way of clamping the winding needle 10 through the clamping mechanism 20, but other ways of fixing the end of the winding needle 10 can also be used, such as the way of connecting with the winding needle 10 through a latch, that is, the end of the winding needle 10 and the end of the stretching mechanism 30 are both formed with a pin hole, and the two are connected through a latch. When the stretching mechanism 30 works, the winding needle 10 can be pulled closer, thereby improving the rigidity of the winding needle 10. It can be understood that the stretching mechanism 30 can also connect the end of the winding needle 10 through a clamping form, and when the stretching mechanism 30 works, the winding needle 10 can be pulled closer, thereby improving the rigidity of the winding needle 10.

[0136] According to some embodiments of the present application, the present application also provides a method for preparing an electrode assembly, please refer to Figure 16 , Figure 16The following is a flowchart of a method for preparing an electrode assembly according to some embodiments of this application. The method includes the following steps: S1: applying a pulling force to the end of the winding needle 10; S2: rotating the winding needle 10 to wind the stacked electrode sheet and diaphragm to form an electrode assembly.

[0137] In step S1, a tension is applied to the end of the winding needle 10 to improve the rigidity of the winding needle 10. When step S2 is performed, that is, when the winding needle 10 rotates to wind the stacked electrode sheets and diaphragms, the deflection deformation of the winding needle 10 can be effectively reduced, ensuring the winding effect of the electrode assembly, and allowing the winding speed to be increased, thereby improving the production efficiency of the electrode assembly.

[0138] Understandably, in conjunction with the second driving unit 26 described above, in some embodiments, the method for fabricating the electrode assembly may further include providing power to both ends of the winding needle 10, so that the rotational speeds of both ends of the winding needle 10 are consistent. By providing power to both ends of the winding needle 10 and synchronizing the rotational speeds at both ends, the inconsistent speeds at the front and rear ends of the winding needle 10 can be prevented, which could lead to the winding needle 10 breaking.

[0139] According to some embodiments of this application, see Figures 4-7 This application provides a needle fixing device 13.

[0140] The needle coil fixing device 13 includes a clamping mechanism 20 and a tensioning mechanism 30. The clamping mechanism 20 includes a housing 21, a clamping assembly 22, a first drive unit 23, a connecting seat 25, and a bearing 24. The housing 21 has an opening 210 for the needle coil 10 to extend into. The clamping assembly 22 includes a transmission member 220, a clamping member 221, a base 222, and an elastic member 223 (see [link to original text]). Figure 11 The transmission component 220 includes a connecting portion 2200 and multiple transmission portions 2201. The base 222 is mounted within the housing 21 via bearings 24, and the bearings 24 and the base 222 are engaged by a limiting protrusion 2225 and a limiting groove to restrict the axial movement of the base 222 on the needle coil 10. The base 222 has multiple guide grooves 2220 extending along the axis of the needle coil 10. The transmission portions 2201 are slidably disposed in the guide grooves 2220. All transmission portions 2201 are connected to the connecting portion 2200. The connecting portion 2200 is rotatably connected to the connecting seat 25. The first drive unit 23 is connected to the connecting seat 25, and the connecting seat 25, guided by a guide rod 27, can move smoothly along the axial direction of the needle coil 10. Each connecting portion 2200 is wedge-shapedly engaged with its corresponding clamping member 221. One end face of the base 222 is formed with a receiving groove 2222, and a portion of the clamping member 221 is located in the receiving groove 2222. The clamping member 221 of the base 222 is limited to the axial direction of the needle coil 10, and the clamping member 221 of the receiving groove 2222 can move radially in the needle coil 10.

[0141] When the first driving unit 23 works, the connecting seat 25 is driven to move along the axis of the winding needle 10, all the transmission parts 2201 are driven to move along the axis of the winding needle 10 through the connecting part, all the clamping parts 221 are radially closed under the action of the transmission part 2201, the winding needle 10 is clamped, the stretching mechanism 30 works to apply a pulling force to the winding needle 10, the winding needle 10 is stretched, thereby improving the rigidity of the winding needle 10, effectively improving the rigidity of the winding needle 10, reducing the deflection deformation of the winding needle 10, ensuring the winding quality of the electrode assembly, and allowing the winding speed to be improved, thereby improving the production efficiency of the electrode assembly.

[0142] When the first driving unit 23 is reset, the transmission part 2201 withdraws the action on the clamping part 221, the clamping part 221 is opened along the radial direction under the action of the elastic part 223, thereby releasing the end of the winding needle 10, and the winding needle 10 can be pulled out of the winding needle fixing device 13.

[0143] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A needle coil fixing device, characterized in that, include: Clamping mechanism, used to clamp or release the end of the coil needle; A tensioning mechanism, connected to the clamping mechanism, is configured to apply a tension force to the clamping mechanism when the clamping mechanism clamps the end of the coil needle, so as to apply a tension force to the coil needle; The clamping mechanism includes: The housing has an opening for the coiling needle to extend into; A clamping assembly is disposed within the housing and rotatably connected to the housing about the axis of the coil needle, the clamping assembly being used to clamp or release the end of the coil needle; The tensioning mechanism is connected to the housing.

2. The needle fixing device according to claim 1, characterized in that, The clamping assembly includes a transmission component and a plurality of clamping components, which are distributed around the axis of the coil needle, and each clamping component is wedge-shapedly engaged with the transmission component. The clamping mechanism further includes: A first driving unit is disposed within the housing. The first driving unit is used to drive the transmission member to move axially along the winding needle, so that the plurality of clamping members close radially along the winding needle, thereby clamping the end of the winding needle.

3. The needle fixing device according to claim 2, characterized in that, The clamping assembly further includes a base rotatably mounted within the housing about the axis of the coil needle, and the transmission member is movably mounted on the base along the axial direction of the coil needle.

4. The needle coil fixing device according to claim 3, characterized in that, The transmission component is inserted into the base along the axial direction of the coiling needle. One end of the transmission component is wedge-shapedly engaged with the plurality of clamping components, and the other end of the transmission component is connected to the first drive unit.

5. The needle coil fixing device according to claim 4, characterized in that, The base is provided with multiple guide grooves, which are distributed circumferentially along the base and each guide groove extends axially along the base. The transmission component includes a connecting part and multiple transmission parts, which are correspondingly arranged with the guide grooves. Each transmission part is slidably disposed in the corresponding guide groove. One end of each transmission part is wedge-shapedly engaged with a corresponding clamping member, and the other end of each transmission part is connected to the connecting part. The connecting part is connected to the first drive unit.

6. The needle coil fixing device according to claim 5, characterized in that, The clamping assembly further includes a base rotatably mounted within the housing about the axis of the coil needle, the base being configured to abut against the clamping member to restrict axial movement of the clamping member along the coil needle.

7. The needle coil fixing device according to claim 6, characterized in that, A receiving groove is provided on one end face of the base, and a portion of each clamping member is located inside the receiving groove, while another portion is located outside the receiving groove and wedge-shapedly engages with the transmission member.

8. The needle fixing device according to any one of claims 3-7, characterized in that, The clamping mechanism further includes: The bearing is used to mount the base within the housing.

9. The needle coil fixing device according to claim 8, characterized in that, One of the base and the bearing is provided with a limiting protrusion, and the other is provided with a limiting groove. The limiting protrusion and the limiting groove cooperate to restrict the base from moving axially along the winding needle.

10. The needle fixing device according to any one of claims 2-7, characterized in that, The clamping assembly further includes: An elastic element configured to apply an elastic force to the plurality of clamping members to cause the plurality of clamping members to open radially along the coil needle, thereby releasing the end of the coil needle.

11. The needle fixing device according to any one of claims 2-7, characterized in that, The clamping mechanism further includes: A connecting seat is disposed within the housing, and the first driving unit is connected to the connecting seat to drive the connecting seat to move along the axial direction of the coiling needle; The second drive unit is fixed to the connecting seat and connected to the transmission component. The second drive unit is used to drive the transmission component to rotate around the axis of the coiling needle.

12. The needle fixing device according to claim 11, characterized in that, The clamping mechanism further includes: A guide rod is fixed inside the housing and extends parallel to the axial direction of the coiling needle; The connecting seat is slidably sleeved on the guide rod.

13. The needle fixing device according to any one of claims 1-7, characterized in that, The clamping mechanism further includes: A second drive unit is disposed within the housing, and the second drive unit is used to drive the clamping assembly to rotate around the axis of the coiling needle.

14. The needle fixing device according to any one of claims 1-7, characterized in that, The clamping assembly includes a plurality of clamping members, each of the clamping members having a first inclined surface for engaging with the end of the coiling needle.

15. The needle fixing device according to any one of claims 1-7, characterized in that, The clamping assembly includes multiple clamping members, each of which has a protrusion for embedding into a recess located at the end of the coil needle.

16. A winding device, characterized in that, include: Mounting base; A coiled needle, one end of which is mounted on the mounting base; as well as The needle fixing device according to any one of claims 1-15, wherein the clamping mechanism is used to clamp the other end of the needle.

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