A winding mechanism and a winding method

Abstract

This invention provides a winding mechanism and a winding method. The winding mechanism includes a winding assembly, a first cutting assembly, and a second cutting assembly. The winding assembly includes a winding head and a winding needle. The winding head is rotatably mounted on a frame plate. The winding needle can be switched between a winding station, an adhesive application station, and a blanking station. A cutting seat is also provided on the winding head. The cutting seat and the winding needle rotate synchronously with the winding head. The cutting seat at the winding station can move relative to the winding needle along the axial direction of the winding head. The cutting seat at the winding station can rotate from a first preset position to a second preset position. Both the first cutting assembly and the second cutting assembly can move towards or away from the cutting seat at the winding station. The first cutting assembly and the cutting seat at the winding station cooperate to cut a first electrode sheet. The second cutting assembly and the cutting seat at the winding station cooperate to cut a diaphragm and a second electrode sheet sandwiched between the diaphragms. This invention solves the problem of low working efficiency in existing winding mechanisms.

Description

Technical Field

[0001] This invention relates to the field of battery processing and manufacturing technology, and more specifically, to a winding mechanism and a winding method. Background Technology

[0002] A winding mechanism is a device used to wind separators and electrodes to form a battery cell. It typically includes a winding needle that, when rotated, winds the separator and electrodes around itself to form the battery cell. With the widespread use of lithium-ion batteries, the demand for lithium-ion batteries is constantly increasing, and the requirements for the processing efficiency of winding mechanisms are also becoming increasingly stringent.

[0003] However, in existing cell winding mechanisms, the station reversal process is usually performed after the winding is completed at the winding station. After the reversal is completed, the next action is performed. The winding time plus the station reversal time results in a long overall cell winding process, which reduces the working efficiency of the winding mechanism. Summary of the Invention

[0004] The problem solved by this invention is the low working efficiency of existing winding mechanisms.

[0005] To address the aforementioned problems, a first aspect of the present invention provides a winding mechanism, comprising: a frame plate and a winding assembly, a first cutter assembly, and a second cutter assembly disposed on the frame plate;

[0006] The winding assembly includes a winding head and three winding needles rotatably mounted on the winding head. The winding head is rotatably mounted on the frame plate and has a winding station, an adhesive application station, and a material unloading station. The three winding needles can switch clockwise or counterclockwise between the winding station, the adhesive application station, and the material unloading station. The winding head is also provided with a cutter seat corresponding to each winding needle. The cutter seat and the winding needles rotate synchronously with the winding head. The cutter seat at the winding station can move relative to the winding needles along the axial direction of the winding head, and the cutter seat at the winding station can rotate from a first preset position to a second preset position.

[0007] The first cutting blade assembly can move closer to or away from the cutting blade holder at the winding station, and the first cutting blade assembly and the cutting blade holder at the winding station cooperate to cut the first electrode sheet;

[0008] The second cutter assembly can move toward or away from the cutter seat at the winding station, and the second cutter assembly and the cutter seat at the winding station cooperate to cut the diaphragm and the second electrode sandwiched between the diaphragm.

[0009] Furthermore, the winding assembly also includes a first driving member and a second driving member, both of which are connected to the cutter holder at the winding station. The first driving member is used to drive the cutter holder to move along the axial direction of the winding head, so that the cutter holder moves relative to the winding needle along the axial direction of the winding head. The second driving member is used to drive the cutter holder to rotate, so that the cutter holder rotates from a first preset position to a second preset position.

[0010] Furthermore, a first follower bearing is provided at the end of the cutter holder opposite to the end of the coiling needle. The second drive member can abut against the first follower bearing, and the second drive member can push the first follower bearing to rotate the cutter holder.

[0011] Furthermore, the cutter holder is provided with an annular groove at the end opposite to the extension of the winding needle, and a second follower bearing is provided on the first drive member. The second follower bearing can be engaged into the annular groove, so that the first drive member drives the cutter holder to move axially along the winding head through the second follower bearing.

[0012] Furthermore, it also includes a paddle roller assembly, which is disposed on the frame plate and located near the winding station. The paddle roller assembly includes a paddle roller that can contact the first electrode and drive the first electrode to move, so that the first electrode is located between the cutter seat and the first cutter assembly at the winding station.

[0013] Furthermore, the first cutting blade assembly includes a first mounting base and a first connecting plate slidably connected to the first mounting base. The first mounting base is disposed on the frame plate, and the first connecting plate is provided with a first cutting blade and a first pressure roller. Both the first cutting blade and the first pressure roller can move toward the cutting blade seat at the winding station, so that the first pressure roller presses the first electrode sheet against the cutting blade seat at the winding station, and the first cutting blade cuts the first electrode sheet. The first cutting blade is a hot cutting blade.

[0014] Furthermore, the first connecting plate is also provided with a first guide rod and a first electrode guide block. The first electrode guide block is connected to two sets of the first guide rods. The first electrode guide block is located on the side of the first cutter away from the first pressure roller. The first guide rod can drive the first electrode guide block to move toward the winding needle at the winding station, so as to guide the cut first electrode into the winding needle at the winding station.

[0015] Furthermore, the second cutter assembly includes a second mounting base and a second connecting plate slidably connected to the second mounting base. The second mounting base is disposed on the frame plate, and the second connecting plate is provided with a second cutter and a second pressure roller. The second cutter and the second pressure roller both move toward the cutter seat at the winding station, so that the second pressure roller presses the second electrode and the diaphragm against the cutter seat at the winding station, so that the second cutter cuts the second electrode and the diaphragm. The second cutter is a serrated cutter.

[0016] Furthermore, the cutter holder includes a cutter roller and a cutter surface, the cutter roller being used to cooperate with the first cutter assembly, and the cutter surface being used to cooperate with the second cutter assembly.

[0017] A second aspect of the present invention provides a winding method for winding a battery cell using a winding mechanism as described in the first aspect, the winding method comprising:

[0018] After the winding needle at the winding station completes the threading and clamping of the first electrode, the second electrode, and the diaphragm, it drives the first electrode, the second electrode, and the diaphragm to rotate, thus completing the first stage of winding of the battery cell.

[0019] After the battery cell completes the first stage of winding, the winding head rotates to change the station direction. During the process of the winding needle rotating from the winding station to the adhesive application station, the winding needle performs the second stage of winding of the battery cell until it is wound to the preset battery cell diameter at the adhesive application station. Then the winding needle stops winding and applies adhesive to the battery cell.

[0020] The cutter head rotates to the winding station and engages with the first cutter assembly to cut the first electrode sheet. Simultaneously, the cutter head rotates to the winding station and engages with the second cutter assembly to cut the second electrode sheet and the diaphragm. At the same time, the winding needle extends from the winding station, clamps the first electrode sheet, the second electrode sheet, and the diaphragm, and then performs the first stage of winding for the next battery cell. After the first stage of winding for the next battery cell is completed, the winding head rotates again to change the station direction, and the next battery cell begins the second stage of winding. The previous battery cell rotates from the adhesive application station to the unloading station for unloading. This process is repeated to ensure continuous winding of the battery cells.

[0021] The winding mechanism and winding method described in this invention combine the station reversal process with the cell winding process, and perform reversal during the winding process of the cell, enabling the winding mechanism to achieve continuous winding, reducing the station reversal time, and improving winding efficiency. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of the winding head of the winding mechanism provided in this embodiment of the invention before the winding head reverses direction;

[0023] Figure 2 This is a schematic diagram of the structure of the winding head of the winding mechanism provided in this embodiment of the invention after reversal;

[0024] Figure 3 for Figure 2 A partial structural diagram;

[0025] Figure 4 This is a schematic diagram of the structure of the winding assembly provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the cutter holder in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the first driving component in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the first driving member and the second driving member driving the cutter holder in an embodiment of the present invention;

[0029] Figure 8 for Figure 7 A schematic diagram of the rear view structure;

[0030] Figure 9 This is a schematic diagram of the paddle roller assembly provided in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of the first cutting blade assembly provided in an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of the second cutter assembly provided in an embodiment of the present invention. Detailed Implementation

[0033] The technical solution of the present invention will now be described clearly and in detail with reference to the accompanying drawings. In this description, it should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. Additionally, in the description of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this specification, the term "as an alternative embodiment" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one alternative embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Combination Figures 1 to 8 As shown, a first aspect of this embodiment provides a winding mechanism, including: a frame plate 10 and a winding assembly 20, a first cutter assembly 30, and a second cutter assembly 40 disposed on the frame plate 10, wherein:

[0036] The winding assembly 20 includes a winding head 21 and three winding needles rotatably mounted on the winding head 21. The winding head 21 is rotatably mounted on the frame plate 10 and has a winding station A, an adhesive application station B, and a unloading station C. When the winding head 21 rotates, it can drive the winding needles to switch clockwise or counterclockwise between the winding station A, the adhesive application station B, and the unloading station C. Preferably, in this embodiment, when the winding head 21 rotates, it can drive the winding needles to switch counterclockwise between the winding station A, the adhesive application station B, and the unloading station C. The winding needles complete the first stage of winding the battery cell 4 at the winding station A. During the process of the winding needles moving from the winding station A to the adhesive application station B and completing the second stage of winding and adhesive application at the adhesive application station B, the winding needles unload the wound battery cell 4 at the unloading station C. The winding head 21 is also equipped with a cutter holder 212. The number of cutter holders 212 is the same as the number of winding needles. Each cutter holder 212 corresponds to a winding needle, and each cutter holder 212 is located close to a winding needle. The cutter holder 212 at winding station A is located between the winding needle at winding station A and the winding needle at adhesive application station B. When the winding head 21 rotates, the cutter holder 212 and the winding needle rotate synchronously. The cutter holder 212 switches between winding station A, adhesive application station B, and unloading station C according to the clockwise or counterclockwise rotation of its corresponding winding needle. Figure 3 The cutter holder 212 can move along the z-axis direction and rotate, so that the cutter holder 212 moves from the first preset position (in the z-axis direction). Figure 2 The position D in the middle, that is Figure 3 The dotted section of the cutter holder in the image rotates to the second preset position. Figure 2 The position E in the middle, that is Figure 3 The solid line portion of the cutter holder), has a preset angle between the first preset position and the second preset position;

[0037] The first cutting assembly 30 is located between the winding station A and the adhesive application station B. The first cutting assembly 30 can move closer to or away from the cutting seat 212 at the winding station A, and the first cutting assembly 30 and the cutting seat 212 at the winding station A cooperate to cut the first electrode 1. The second cutting assembly 40 is located near the unloading station C. The second cutting assembly 40 can move closer to or away from the cutting seat 212 at the winding station A, and the second cutting assembly 40 and the cutting seat 212 at the winding station A cooperate to cut the diaphragm 3 and the second electrode 2 sandwiched between the diaphragms 3.

[0038] Thus, the winding needle completes the first stage of winding the battery cell at winding station A. During the reversal of the winding head 21, the winding head 21 drives the winding needle at winding station A to rotate to adhesive application station B. At the same time, the winding needle performs the second stage of winding the battery cell. After the winding needle at winding station A reaches adhesive application station B, the winding needle continues the second stage of winding the battery cell until the preset battery cell diameter is reached. Then, the winding needle stops winding and applies adhesive to the battery cell. Subsequently, the cutter holder 212 at winding station A moves relative to the winding needle along the winding head... The axial movement of the cutting head causes the cutter holder 212 at winding station A to extend and rotate from a first preset position to a second preset position. This allows the cutter holder 212 to engage with the first cutting assembly 30 and the second cutting assembly 40 to cut the first electrode 1, the second electrode 2, and the diaphragm 3. The first electrode 1, the second electrode 2, and the diaphragm 3 are then wound onto the next winding needle that has rotated to winding station A. The winding needle at winding station A then performs the first stage winding of the next battery cell. In this embodiment, by combining the station reversing process with the battery cell winding, the reversing occurs during the winding process, enabling the winding mechanism to achieve continuous winding, reducing the station reversing time, and improving winding efficiency.

[0039] It should be noted that the first preset position in this embodiment is the initial position of the cutter holder 212. Those skilled in the art can set the initial position of the cutter holder 212 according to the actual situation. The second preset position is the position of the cutter holder 212 after rotation. In this embodiment, the specific position of the second preset position is not further limited. Those skilled in the art can set it according to the actual situation, as long as it can ensure that the first electrode 1 is sandwiched between the first cutter assembly 30 and the cutter holder 212, and the second electrode 2 and the diaphragm 3 are sandwiched between the second cutter assembly 40 and the cutter holder 212.

[0040] Based on the above embodiments, as an optional implementation method, combined with Figure 4As shown, the winding head 21 is provided with needles 211, and the winding needles extend from the needles 211. Each needle 211 is located close to the cutter seat 212. When the cutter seat 212 is not moving relative to the winding needles along the axial direction of the winding head 21, the end face of the cutter seat 212 does not protrude from the end face of the needles 211. That is, the end face of the needles 211 protrudes from the end face of the cutter seat 212, or the end face of the needles 211 is flush with the end face of the cutter seat 212. Thus, during the reversal process of the winding head 21, the cutter seat 212 can play a role in avoiding interference with the winding head 21's continued winding of the battery cell during the reversal process. When the cutter holder 212 moves relative to the winding needle along the axial direction of the winding head 21, the end face of the cutter holder 212 can protrude from the end face of the needle tip 211. Thus, after the battery cell is wound to a preset battery cell diameter, the cutter holder 212 extends and rotates from a first preset position to a second preset position, so that the cutter holder 212 can cooperate with the first cutter assembly 30 and the second cutter assembly 40 respectively, so as to cut the first electrode 1, the second electrode 2 and the diaphragm 3.

[0041] Based on the above embodiments, as an optional implementation, the winding assembly 20 further includes a first driving member 22 and a second driving member 23. Both the first driving member 22 and the second driving member 23 are connected to the cutter holder 212 at the winding station A. The first driving member 22 drives the cutter holder 212 at the winding station A to move along the axial direction of the winding head 21, causing the cutter holder 212 to move relative to the winding needle along the axial direction of the winding head. The second driving member 23 drives the cutter holder 212 to rotate, causing the cutter holder 212 to rotate from a first preset position to a second preset position. Specifically, in conjunction with... Figures 5 to 8As shown, the first driving member 22 and the second driving member 23 are both positioned corresponding to the cutter holder 212 at the winding station A, and both the first driving member 22 and the second driving member 23 are located on the side of the winding head 21 away from the needle nozzle 211. Each cutter holder 212 is provided with a first follower bearing 2124 at the end away from the needle nozzle 211. When the cutter holder 212 rotates to the winding station A, the second driving member 23 can abut against the first follower bearing 2124 and push the first follower bearing 2124 to rotate the cutter holder 212, thereby rotating the cutter holder 212 from the first preset position to the second preset position. Each cutter holder 212 has an annular groove 2125 at the end opposite to the needle tip 211. The annular groove 2125 is located near the first follower bearing 2124. The first drive member 22 is provided with a second follower bearing 221. During the process of the winding head 21 reversing and driving the cutter holder 212 to rotate, the second follower bearing 221 can be engaged in the annular groove 2125, so that the second follower bearing 221 abuts against the cutter holder 212. When the first drive member 22 moves along the axial direction of the winding head 21, the first drive member 22 can drive the second follower bearing 221 to move along the axial direction of the winding head 21, so that the first drive member 22 can drive the cutter holder 212 to move along the axial direction of the winding head 21 through the second follower bearing 221, thereby causing the cutter holder 212 to extend or retract. Furthermore, during the process of the winding head 21 reversing again, the cutter holder 212 will rotate with the winding head 21, so that the second follower bearing 221 can disengage from the annular groove. Therefore, by adopting the above structure, the first drive member 22 and the second drive member 23 only need to be set at the position corresponding to the cutter seat 212 at the winding station A. This helps to reduce the floor space occupied by the winding mechanism, makes the adjustment process of the cutter seat 212 simpler and faster, and helps to further improve the working efficiency of the winding mechanism.

[0042] Based on the above embodiments, as an optional implementation, when adjusting the cutter holder 212, the first driving member 22 first drives the cutter holder 212 at the winding station A to move along the axial direction of the winding head 21, so that the cutter holder 212 moves relative to the winding needle along the axial direction of the winding head. Then, the second driving member 23 drives the cutter holder 212 to rotate, so that the cutter holder 212 rotates from the first preset position to the second preset position. Thus, by first driving the cutter holder 212 to move along the axial direction of the winding head, and then rotating the cutter holder 212 from the first preset position to the second preset position, interference between the cutter holder 212 and the needle tip 211 or the winding needle can be avoided.

[0043] It should be noted that the specific structure of the first driving component 22 and the second driving component 23 is not further limited in this embodiment. Those skilled in the art can make the settings according to the actual situation. For example, the first driving component 22 and the second driving component 23 can be conventional driving components such as servo motors, cylinders, and hydraulic cylinders, and can be driven by conventional mechanical transmission structures such as lead screws, chains, racks, synchronous pulleys, and belts. For example, the first driving component 22 can be connected to the second follower bearing 221 by a transmission structure such as a lead screw and a slider. As an optional implementation, the first driving component 22 can be a servo motor, and the second driving component 23 can be a cylinder.

[0044] Based on the above embodiments, as an optional implementation, the winding head 21 is provided with three receiving cavities, and each set of cutter seats 212 and needle nozzles 211 are housed in the receiving cavity. Along the radial direction of the winding head 21, the cross-sectional area of ​​the receiving cavity along the radial direction of the winding head 21 is greater than the sum of the cross-sectional areas of the cutter seats 212 and needle nozzles 211 along the radial direction of the winding head 21. As a result, the cutter seats 212 can rotate within the receiving cavity, thereby enabling the cutter seats 212 to rotate from a first preset position to a second preset position.

[0045] Based on the above embodiments, as an optional implementation, the cutter holder 212 includes a roller bracket and a cutter roller 2121 and a top post 2122 disposed on the roller bracket. The cutter roller 2121 extends along the axial direction of the winding head 21 and is used to cooperate with the first cutter assembly 30, so that the first electrode 1 is located between the cutter roller 2121 and the first cutter assembly 30, so that the first cutter assembly 30 can cut the first electrode 1. The top post 2122 is disposed on the roller bracket 2121 away from the cutter roller 2121. On one side, the top post 2122 is used to cooperate with the positioning seat at the outer end of the winding head 21. When the cutter seat 212 moves along the axial direction of the winding head 21, it can play a supporting role and prevent the cutter seat 212 from being too long and unstable. The roller bracket 2121 is provided with a cutting surface 2123 at the end opposite to the top post 2122. The cutting surface 2123 is used to cooperate with the second cutter assembly 40 so that the second electrode 2 and the diaphragm 3 are located between the cutting surface 2123 and the second cutter assembly 40, so that the second cutter assembly 40 can cut the second electrode 2 and the diaphragm 3.

[0046] Based on the above embodiments, as an optional implementation method, combined with Figure 1 and Figure 2As shown, the winding mechanism also includes a paddle roller assembly 50, which is mounted on the frame plate 10 and positioned near the winding station A. The paddle roller assembly 50 is used to contact the first electrode 1 and can drive the first electrode 1 to move to the left, causing the first electrode 1 to move away from the cutter seat 212 at the winding station A. This allows the first electrode 1 to avoid the cutter seat 212 at the winding station A, so that the cutter seat 212 at the winding station A can move along the axial direction of the winding head 21, allowing the cutter seat 212 to extend and cooperate with the first cutter assembly 30 and the second cutter assembly 40, preventing the first electrode 1 from affecting the extension of the cutter seat 212. Furthermore, the paddle roller assembly 50 can also position the first electrode 1 between the cutter seat 212 and the first cutter assembly 30 at the winding station A, facilitating subsequent cutting of the first electrode 1 by the first cutter assembly 30. Specifically, in conjunction with... Figure 9 As shown, the paddle roller assembly 50 includes a paddle roller 51, a third connecting plate 52, and a third driving component 53. The paddle roller 51 and the third connecting plate 52 are connected. The third connecting plate 52 can be connected to the third driving component 53 via a lead screw. The third driving component 53 can drive the third connecting plate 52 to move via the lead screw, thereby driving the paddle roller 51 to move through the third connecting plate 52. This causes the paddle roller 51 to contact the first electrode 1 and drive the first electrode 1 to move away from the cutter seat 212 at the winding station A. The third driving component 53 can be a servo motor, but it can also be a conventional driving component such as a cylinder or a hydraulic cylinder.

[0047] Based on the above embodiments, as an optional implementation method, combined with Figure 10 As shown, the first cutter assembly 30 includes a first mounting base 31, which is mounted on the frame plate 10. The first mounting base 31 is provided with a first slide rail, a first connecting plate (not shown in the figure), and a fourth driving member 32. The first slide rail is slidably connected to the first connecting plate. The fourth driving member 32 drives the first connecting plate to move along the first slide rail, causing the first connecting plate to move to the right (i.e.,...). Figure 1The first connecting plate is equipped with a first cutter 33, a first pressure roller 34, a first electrode guide block 35, a first guide rod 36, a fifth drive member 37, a sixth drive member 38, and a seventh drive member 39. The first cutter 33 is located between the first pressure roller 34 and the first electrode guide block 35. The first pressure roller 34 is connected to the sixth drive member 38, which drives the first pressure roller 34 relative to the first connecting plate toward the cutter holder 212 at the winding station A, so that the first pressure roller 34 moves toward the cutter holder 212 at the winding station A. The first electrode 1 is pressed against the cutter seat 212 at the winding station A, and the first pressure roller 34 and the cutter roller 2121 cooperate to clamp the first electrode 1; the first cutter 33 is connected to the fifth drive member 37, which is used to drive the first cutter 33 to move relative to the first connecting plate toward the cutter seat 212 at the winding station A. After the first pressure roller 34 presses the first electrode 1 against the cutter seat 212 at the winding station A, the first cutter 33 can cut the first electrode 1. Two sets of first guide rods 36 are provided on the first connecting plate. One end of each set of first guide rods 36 is connected to the first electrode guide block 35, and the other end of each set of first guide rods 36 is connected to the seventh driving member 39. The seventh driving member 39 drives the first electrode guide block 35 to move through the two sets of first guide rods 36, so that the first electrode guide block 35 moves relative to the first connecting plate toward the winding needle at the winding station A, and guides the cut first electrode 1 into the winding needle at the winding station A, so as to facilitate the winding of the next battery cell. Therefore, the first cutter 33, the first pressure roller 34, and the first electrode guide block 35 are controlled by different driving components, which can better adjust the distance between each component. This allows the first pressure roller 34 to cooperate with the cutter roller 2121 to clamp the first electrode 1, the first cutter 33 to cut the first electrode 1 better, and the first electrode guide block 35 to push the cut first electrode 1 into the winding needle. Furthermore, by setting two sets of first guide rods 36 connected to the first electrode guide block 35, the first electrode guide block 35 can be pushed more smoothly, allowing the first electrode guide block 25 to smoothly and steadily push the cut first electrode 1 into the winding needle.

[0048] Based on the above embodiments, as an optional implementation, the first electrode guide block 35 has an guide slope, through which the first electrode 1 is pushed into the winding needle.

[0049] It should be noted that the specific structures of the fourth driving component 32, the fifth driving component 37, the sixth driving component 38, and the seventh driving component 39 are not further limited in this embodiment. Those skilled in the art can make the settings according to the actual situation. For example, the fourth driving component 32, the fifth driving component 37, the sixth driving component 38, and the seventh driving component 39 can be conventional driving components such as servo motors, cylinders, and hydraulic cylinders, and can be driven by conventional mechanical transmission structures such as lead screws, chains, racks, synchronous pulleys, and belts. As an optional implementation, the fourth driving component 32 can be a servo motor, and the fifth driving component 37, the sixth driving component 38, and the seventh driving component 39 can be cylinders.

[0050] Based on the above embodiments, as an optional implementation method, combined with Figure 11 As shown, the second cutter assembly 40 includes a second mounting base (not shown in the figure), which is mounted on the frame plate 10. The second mounting base is provided with a second slide rail 41, a second connecting plate 42, and an eighth driving member 43. The second slide rail 41 is slidably connected to the second connecting plate 42. The eighth driving member 43 drives the second connecting plate 42 to move along the second slide rail 41, causing the second connecting plate 42 to move to the upper left (i.e., Figure 1 The second connecting plate 42 is equipped with a second cutter 44, a second pressure roller 45, and a ninth driving member 46. The ninth driving member 46 is connected to the second cutter 44 and the second pressure roller 45. The ninth driving member 46 is used to drive the second cutter 44 and the second pressure roller 45 to move relative to the second connecting plate 42 toward the cutter seat 212 at the winding station A, so that the second pressure roller 45 presses the second electrode 2 and the diaphragm 3 against the cutter seat 212 at the winding station A, and the second pressure roller 45 cooperates with the cutter surface 2123 to clamp the second electrode 2 and the diaphragm 3. The second cutter 44 can cut the second electrode 2 and the diaphragm 3.

[0051] Based on the above embodiments, as an optional implementation, the second pressure roller 45 is connected to the ninth driving member 46 via a second guide rod. An elastic element is mounted on the second guide rod, and this elastic element can adjust the pressure exerted by the second pressure roller 45 against the second electrode 2 and diaphragm 3 on the cutter holder 212. Thus, by providing the elastic element, when the second pressure roller 45 presses against the second electrode 2 and diaphragm 3, the elastic element allows the second pressure roller 45 to elastically press against the second electrode 2 and diaphragm 3, avoiding the phenomenon of excessive force causing breakage of the second electrode 2 and diaphragm 3 due to rigid pressing. As an optional implementation, the elastic element can be a spring.

[0052] Based on the above embodiments, as an optional implementation, the first cutter 33 is a hot cutter, which burns off the tape on the first electrode 1, thereby facilitating the winding of the next battery cell. The second cutter 44 is a serrated cutter, which cuts the second electrode 2 and the two layers of separator 3 together.

[0053] In this embodiment, the winding mechanism has a cutting and adhesive-applying assembly at the front end of the first cutter assembly 30 and the second cutter assembly 40. After the cutting and adhesive-applying assembly cuts the first electrode 1 and the second electrode 2, the two parts of the cut first electrode 1 are pulled apart by a certain distance, and insulating adhesive paper is applied to both sides of the first electrode 1. The first cutter assembly 30 then cuts the first electrode 1 at the point where the insulating adhesive paper is applied. Similarly, after the two parts of the cut second electrode 2 are pulled apart by a certain distance, insulating adhesive paper is applied to both sides of the second electrode 2, and the second cutter assembly 40 then cuts the second electrode 2 at the point where the insulating adhesive paper is applied. Therefore, cutting the first electrode 1 at the point where the insulating adhesive paper is applied by the first cutter assembly 30 and cutting the second electrode 2 at the point where the insulating adhesive paper is applied by the second cutter assembly 40 helps to improve the safety of the wound battery cell.

[0054] It should be noted that the specific structures of the eighth driving component 43 and the ninth driving component 46 are not further limited in this embodiment. Those skilled in the art can make the settings according to the actual situation. For example, the eighth driving component 43 and the ninth driving component 46 can be conventional driving components such as servo motors, cylinders, and hydraulic cylinders, and can be driven by conventional mechanical transmission structures such as lead screws, chains, racks, synchronous pulleys, and belts. As an optional implementation, the eighth driving component 43 can be a servo motor, and the ninth driving component 46 can be a cylinder.

[0055] Combination Figure 1 and Figure 2 As shown, the second aspect of this embodiment provides a winding method for winding a battery cell using a winding mechanism as described in the first aspect. The winding method includes:

[0056] Step S1: After the winding needle at the winding station A completes the threading and clamping of the first electrode 1, the second electrode 2 and the diaphragm 3, it drives the first electrode 1, the second electrode 2 and the diaphragm 3 to rotate, completing the first stage of winding of the battery cell.

[0057] Based on the above embodiments, as an optional implementation, the winding needle located at winding station A can rotate clockwise, causing the first electrode 1, the second electrode 2, and the diaphragm 3 to rotate, thus performing the first stage of winding of the battery cell. When the battery cell is wound to two-thirds of the preset battery cell diameter, the first stage of winding is completed. In this embodiment, the preset battery cell diameter is not further limited; those skilled in the art can set it according to actual conditions.

[0058] Step S2: After the battery cell completes the first stage of winding, the winding head 21 rotates to change the station direction. The winding needle at the winding station A rotates together with the winding head 21 to the adhesive application station B. During the process of the winding needle rotating from the winding station A to the adhesive application station B, the winding needle performs the second stage of winding of the battery cell until it is wound to the preset battery cell diameter at the adhesive application station B. Then the winding needle stops winding and the battery cell is adhesive applied.

[0059] Based on the above embodiments, as an optional implementation, the winding head 21 can rotate counterclockwise to change the station orientation. During the reversal process, the winding needle drives the first electrode 1, the second electrode 2, and the diaphragm 3 clockwise to wind the battery cell in the second stage. After the reversal is completed, the winding needle rotates to the adhesive application station B to continue winding the battery cell in the second stage until it reaches the preset battery cell diameter. Furthermore, during the reversal process of the winding head 21, the fourth driving member 32 in the first cutter assembly 30 drives the first connecting plate to move to the right to approach the cutter seat 212 at the winding station A. The eighth driving member 43 in the second cutter assembly 40 drives the second connecting plate 42 to move to the upper left to approach the cutter seat 212 at the winding station A. At the same time, the paddle roller 51 in the paddle roller assembly 50 contacts the first electrode 1 and drives the first electrode 1 to move to the left, causing the first electrode 1 to move away from the cutter seat 212 at the winding station A. After the winding head 21 is reversed, during the second stage of winding the battery cell at the adhesive application station B, the first drive unit 22 drives the cutter seat 212 at the winding station A to move along the axial direction of the winding head 21, so that the cutter seat 212 moves relative to the winding needle along the axial direction of the winding head, causing the cutter seat 212 to extend. The second drive unit 23 drives the cutter seat 212 to rotate, so that the cutter seat 212 rotates from the first preset position to the second preset position.

[0060] Step S3: The cutter holder 212 rotates to the winding station A and engages with the first cutter assembly 30 to cut the first electrode 1. The cutter holder 212 rotates to the winding station A and engages with the second cutter assembly 40 to cut the second electrode 2 and the diaphragm 3. At the same time, the winding needle rotates to the winding station A and extends to clamp the first electrode 1, the second electrode 2, and the diaphragm 3. Then, the first stage of winding of the next cell is performed. After the first stage of winding of the next cell is completed, the winding head 21 rotates to change the station direction. The next cell begins the second stage of winding. The previous cell rotates from the adhesive application station B to the unloading station for unloading. The above operations are repeated to make the cells continuously wound.

[0061] Based on the above embodiments, as an optional implementation, after the winding needle rotates to the adhesive application station B and completes winding, the first pressure roller 34 of the first cutter assembly 30 presses the first electrode 1 against the cutter seat 212 rotated to the winding station A, and the first pressure roller 34 cooperates with the cutter roller 2121 to clamp the first electrode 1, and the first cutter 33 cuts the first electrode 1; the second pressure roller 45 of the second cutter assembly 40 presses the second electrode 2 and the diaphragm 3 against the cutter seat 212 rotated to the winding station A, and the second pressure roller 45 cooperates with the cutter surface 2123 to clamp the second electrode 2 and the diaphragm 3, and the second cutter 44 cuts the second electrode 2 and the diaphragm 3. While the first cutter 33 cuts the first electrode 1, the first electrode guide block 35 presses against the first electrode 1 and moves towards the winding needle at the winding station A, guiding the cut first electrode 1 into the winding needle at the winding station A to facilitate the winding of the next cell. After the first cutter assembly 30 cuts the first electrode 1, the first cutter assembly 30 resets. After the second cutter assembly 40 cuts the second electrode 2 and the diaphragm 3, the second cutter assembly 40 resets, and the cutter holder 212 moves axially relative to the winding needle along the winding head, causing the cutter holder 212 to retract and return to its original position. At this time, the winding needle at the winding station A begins the winding of the next cell.

[0062] The winding method provided in this embodiment combines the station reversal process with the cell winding process. The reversal is performed during the winding process of the cell, which enables the winding mechanism to achieve continuous winding, reduces the station reversal time, and improves the winding efficiency.

[0063] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A winding mechanism, characterized in that, include: A frame plate and a winding assembly, a first cutter assembly, a second cutter assembly, and a paddle roller assembly disposed on the frame plate; The winding assembly includes a winding head and three winding needles rotatably mounted on the winding head. The winding head is rotatably mounted on the frame plate and has a winding station, an adhesive application station, and a material unloading station. The three winding needles can switch clockwise or counterclockwise between the winding station, the adhesive application station, and the material unloading station. The winding head is also provided with a cutter seat corresponding to each winding needle. The cutter seat and the winding needles rotate synchronously with the winding head. The cutter seat at the winding station can move relative to the winding needles along the axial direction of the winding head, and the cutter seat at the winding station can rotate from a first preset position to a second preset position. The first cutting blade assembly can move closer to or away from the cutting blade holder at the winding station, and the first cutting blade assembly and the cutting blade holder at the winding station cooperate to cut the first electrode sheet; The second cutting assembly can move toward or away from the cutting seat at the winding station, and the second cutting assembly and the cutting seat at the winding station cooperate to cut the diaphragm and the second electrode sandwiched between the diaphragm; The paddle roller assembly is located close to the winding station. The paddle roller assembly includes a paddle roller, which can contact the first electrode and drive the first electrode to move, so that the first electrode is located between the cutter seat and the first cutter assembly at the winding station. The cutter holder includes a cutter roller and a cutter surface. The cutter roller is used to cooperate with the first cutter assembly, and the cutter surface is used to cooperate with the second cutter assembly.

2. The winding mechanism according to claim 1, characterized in that, The winding assembly further includes a first driving member and a second driving member. Both the first driving member and the second driving member are connected to the cutter holder at the winding station. The first driving member is used to drive the cutter holder to move along the axial direction of the winding head, so that the cutter holder moves relative to the winding needle along the axial direction of the winding head. The second driving member is used to drive the cutter holder to rotate, so that the cutter holder rotates from a first preset position to a second preset position.

3. The winding mechanism according to claim 2, characterized in that, The cutter holder is provided with a first follower bearing at the end opposite to the end of the coiling needle. The second drive member can abut against the first follower bearing, and the second drive member can push the first follower bearing to make the cutter holder rotate.

4. The winding mechanism according to claim 2, characterized in that, The cutter holder is provided with an annular groove at the end opposite to the extension of the winding needle. The first drive member is provided with a second follower bearing, which can be engaged into the annular groove, so that the first drive member drives the cutter holder to move axially along the winding head through the second follower bearing.

5. The winding mechanism according to claim 1, characterized in that, The first cutting blade assembly includes a first mounting base and a first connecting plate slidably connected to the first mounting base. The first mounting base is disposed on the frame plate, and the first connecting plate is provided with a first cutting blade and a first pressure roller. Both the first cutting blade and the first pressure roller can move toward the cutting blade seat at the winding station, so that the first pressure roller presses the first electrode sheet against the cutting blade seat at the winding station. The first cutting blade cuts the first electrode sheet. The first cutting blade is a hot cutting blade.

6. The winding mechanism according to claim 5, characterized in that, The first connecting plate is also provided with a first guide rod and a first electrode guide block. The first electrode guide block is connected to two sets of the first guide rods. The first electrode guide block is located on the side of the first cutter away from the first pressure roller. The first guide rod can drive the first electrode guide block to move toward the winding needle at the winding station, so as to guide the cut first electrode into the winding needle at the winding station.

7. The winding mechanism according to claim 1, characterized in that, The second cutter assembly includes a second mounting base and a second connecting plate slidably connected to the second mounting base. The second mounting base is disposed on the frame plate, and the second connecting plate is provided with a second cutter and a second pressure roller. The second cutter and the second pressure roller both move toward the cutter seat at the winding station, so that the second pressure roller presses the second electrode and the diaphragm against the cutter seat at the winding station, so that the second cutter cuts the second electrode and the diaphragm. The second cutter is a serrated cutter.

8. A winding method, characterized in that, The battery cell is wound using a winding mechanism as described in any one of claims 1 to 7, the winding method comprising: After the winding needle at the winding station completes the threading and clamping of the first electrode, the second electrode, and the diaphragm, it drives the first electrode, the second electrode, and the diaphragm to rotate, thus completing the first stage of winding of the battery cell. After the battery cell completes the first stage of winding, the winding head rotates to change the station direction. During the process of the winding needle rotating from the winding station to the adhesive application station, the winding needle performs the second stage of winding of the battery cell until it is wound to the preset battery cell diameter at the adhesive application station. Then the winding needle stops winding and applies adhesive to the battery cell. The cutter head rotates to the winding station and engages with the first cutter assembly to cut the first electrode sheet. Simultaneously, the cutter head rotates to the winding station and engages with the second cutter assembly to cut the second electrode sheet and the diaphragm. At the same time, the winding needle extends from the winding station, clamps the first electrode sheet, the second electrode sheet, and the diaphragm, and then performs the first stage of winding for the next battery cell. After the first stage of winding for the next battery cell is completed, the winding head rotates again to change the station direction, and the next battery cell begins the second stage of winding. The previous battery cell rotates from the adhesive application station to the unloading station for unloading. This process is repeated to ensure continuous winding of the battery cells.

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