Battery cell winding method

Abstract

The application relates to a winding method of an electric core. After winding a preset number of turns, the winding needle assembly of the winding station is first moved out of the winding station and finally reaches the rubber bonding station. The winding needle assembly in the waiting position is moved into the winding station, and the winding needle assembly in the blanking station continues to perform the blanking operation in the blanking station. After the winding needle assembly in the blanking station completes the blanking operation, the winding needle assemblies in the rubber bonding station and the blanking station are moved to the blanking station and the waiting position respectively. In this way, the continuous preparation of the electric core can be realized. It can be seen that during the waiting process of the blanking, the remaining winding needle assemblies can be switched between stations and perform corresponding operations. The waiting time between processes is fully utilized and compressed. Therefore, the winding device and the electric core processing equipment can speed up the production rhythm, thereby improving the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of lithium battery processing technology, and in particular to a method for winding battery cells. Background Technology

[0002] Winding is a common process in lithium battery manufacturing. It involves winding and bonding the positive electrode, negative electrode, and separator together, and then applying adhesive at the end to form a wound battery cell. To achieve continuous winding, three sets of winding needle assemblies are typically used. These three sets of needle assemblies rotate synchronously under the drive of a mechanism, cycling sequentially between the winding station, the adhesive application station, and the unloading station to complete the winding, adhesive application, and unloading operations of the battery cell, respectively. In actual production, the time required for different processes varies. Typically, the unloading process is time-consuming, while the adhesive application and winding processes are relatively quick. However, with current methods, the needle assembly that has completed the adhesive application and winding sequence usually needs to remain at its current station for a considerable period until another needle assembly completes the unloading process before switching stations. This results in excessively high waiting time during production, restricting the production cycle and ultimately hindering the improvement of battery cell production efficiency. Summary of the Invention

[0003] Therefore, it is necessary to provide a cell winding method that can improve cell production efficiency in response to the above problems.

[0004] A method for winding a battery cell, comprising: In step S11, the needle winding assembly located at the unloading station performs the unloading operation, the needle winding assembly located at the winding station performs the winding operation, and the needle winding assembly located at the waiting position is in a waiting state. Step S12: After completing the preset number of turns of winding, the winding needle assembly located at the winding station moves out of the winding station and towards the adhesive application station, and finally arrives at the adhesive application station. The winding needle assembly located at the waiting position moves to the winding station, and the winding needle assembly located at the unloading station still performs the unloading operation. Step S13: After the material feeding operation is completed, the needle winding assembly located at the material feeding station moves to the waiting position, and the needle winding assembly located at the adhesive application station moves to the material feeding station.

[0005] In one embodiment, in step S12, the step of the needle assembly located at the winding station moving out of the winding station toward the adhesive application station and finally reaching the adhesive application station includes: the needle assembly moved out of the winding station first moves to an intermediate position between the winding station and the adhesive application station and stays there; the separator tape of the battery cell connected to the needle assembly at the intermediate position is cut; the needle assembly then moves from the intermediate position to the adhesive application station.

[0006] In one embodiment, after the step of cutting the separator strip connected to the battery cell on the intermediate position winding needle assembly, the method further includes the step of pressing the free segment formed by cutting the separator strip onto the surface of the battery cell.

[0007] In one embodiment, step 12 includes: after completing a preset number of turns of winding, the winding needle assembly that has been moved out from the winding station first reaches the middle position and stays there; the winding needle assembly that has been moved out from the waiting position then reaches the winding station.

[0008] In one embodiment, step 12 includes: after completing a preset number of turns of winding, the winding needle assembly that has been moved out from the waiting position first arrives at the winding station; the winding needle assembly that has been moved out from the winding station then arrives at the intermediate position and stays there.

[0009] In one embodiment, step 12 includes: after a preset number of turns of winding is completed, at the same time that the winding needle assembly that has moved out from the winding station reaches the intermediate position, the winding needle assembly that has moved out from the waiting position reaches the winding station.

[0010] In one embodiment, step 12 includes: after completing a preset number of turns of winding, the winding needle assembly displaced from the winding station moves toward the adhesive application station at a first speed, and the winding needle assembly displaced from the waiting position moves toward the winding station at a second speed greater than the first speed; when the winding needle assembly displaced from the waiting position reaches the winding station, the winding needle assembly displaced from the winding station reaches the intermediate position.

[0011] In one embodiment, step 12 includes: before completing a preset number of turns of winding, the needle assembly located at the waiting position first starts to move towards the winding station; after completing the preset number of turns of winding, the needle assembly located at the winding station moves towards the adhesive application station; when the needle assembly moved out of the waiting position reaches the winding station, the needle assembly moved out of the winding station reaches the intermediate position.

[0012] In one embodiment, after a preset number of turns are completed, the winding needle assembly located at the winding station moves synchronously with the winding needle assembly that has moved out of the waiting position.

[0013] In one embodiment, as the needle winding assembly moves from the intermediate position to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm tape; or, a finishing roll operation is performed on the free section of the diaphragm tape at the intermediate position; or, after the needle winding assembly moves to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm tape.

[0014] In one embodiment, in step S12, the step of the needle assembly located at the winding station moving out of the winding station and into the adhesive application station includes: the needle assembly moving out of the winding station continuously moving towards the adhesive application station and moving directly to the adhesive application station.

[0015] In one embodiment, the needle assembly displaced from the winding station moves at a constant speed toward the adhesive application station.

[0016] In one embodiment, when the needle winding assembly moves to the adhesive application station, the separator strip connected to the battery cell is cut, and the free section formed by cutting the separator strip is pressed onto the surface of the battery cell; a finishing winding operation is performed on the free section of the separator strip.

[0017] In one embodiment, as the needle winding assembly continues to move from the winding station to the adhesive application station, the needle winding assembly continues to perform the winding operation.

[0018] In one embodiment, the separator tape connected to the battery cell is cut as the needle assembly moves continuously from the winding station to the adhesive application station.

[0019] In one embodiment, as the needle winding assembly moves continuously from the winding station to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm strip; or, after the needle winding assembly moves to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm strip.

[0020] In one embodiment, step S13 includes: synchronously driving the needle winding assembly located at the unloading station and the adhesive application station to move to the waiting position and the unloading station respectively.

[0021] In one embodiment, in step S12, a first rotating mechanism is used to drive the needle assembly at the waiting position to move to the winding station, and a second rotating mechanism is used to drive the needle assembly located at the winding station to move out of the winding station toward the adhesive application station, and finally reach the adhesive application station.

[0022] In one embodiment, in step S13, a first rotating mechanism is used to synchronously drive the needle winding assembly located at the unloading station and the adhesive application station to move to the waiting position and the unloading station, respectively.

[0023] In the aforementioned battery cell winding method, after completing a preset number of turns, the winding needle assembly at the winding station first moves out of the winding station and finally arrives at the adhesive application station. The winding needle assembly at the waiting position moves into the winding station, while the winding needle assembly at the unloading station continues its unloading operation. Once the winding needle assembly at the unloading station has completed its unloading operation, the winding needle assemblies at the adhesive application station and the unloading station can be moved to the unloading station and the waiting position, respectively. This cycle is repeated to achieve continuous battery cell production. It is evident that while waiting for unloading to complete, the remaining winding needle assemblies can switch positions and perform corresponding operations, fully utilizing and compressing the waiting time between processes. Therefore, the aforementioned winding device and battery cell processing equipment can accelerate the production cycle, thereby improving production efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic flowchart of a cell winding method in one embodiment of the present invention; Figure 2 This is a schematic diagram of a battery cell winding method in one embodiment of the present invention; Figure 3 This is a flowchart illustrating step S12 in one embodiment; Figure 4 This is a flowchart illustrating step S12 in another embodiment; Figure 5 This is a schematic diagram of the structure of a winding device for performing a cell winding method in one embodiment; Figure 6 for Figure 5 A partial structural diagram of a single winding needle assembly cooperating with the first rotating mechanism in the winding device shown; Figure 7 for Figure 5 The diagram shows the structure of the second rotating mechanism in the winding device. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0028] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Please see Figure 1 The battery cell winding method in one embodiment of the present invention includes steps S11 to S13.

[0033] In step S11, the needle winding assembly 300 located at the unloading station performs the unloading operation, the needle winding assembly 300 located at the winding station performs the winding operation, and the needle winding assembly 300 located at the waiting position is in a waiting state.

[0034] Three needle winding assemblies 300 are provided, and all three can revolve around a first rotation axis, thereby achieving cyclic switching between the winding station, the adhesive application station, and the unloading station. When the needle winding assembly 300 is in the winding station, it can be driven to perform a winding operation to continuously wind and form a battery cell. Specifically, the electrode strip and the separator strip can be connected to the needle winding assembly 300 first, and then the needle winding assembly 300 can be driven to rotate to wind the electrode strip and the separator strip to form a battery cell. After the needle winding assembly 300 enters the adhesive application station, it can perform a finishing adhesive application operation on the wound battery cell; and after the needle winding assembly 300 enters the unloading station, it can remove the glued battery cell from the needle winding assembly 300, freeing up the needle winding assembly 300.

[0035] Since the processing times for each workstation vary, to avoid unnecessary waiting, the needle winding assembly 300 at its corresponding workstation can initiate workstation switching immediately after the shorter processing time is completed, without waiting for the longer processing time to finish. At this time, because some longer workstations are still occupied, this application also includes a waiting position for temporary buffering and scheduling of the needle winding assembly 300, ensuring smooth operation. The needle winding assembly 300 located in the waiting position is in a waiting state and generally does not participate in any operation.

[0036] Specific reference Figure 2 As shown, the winding station, adhesive application station, unloading station, and waiting position are all evenly distributed circumferentially along the first rotation axis, with the waiting position located between the unloading station and the winding station. At this time, the adhesive application station is set at a 90-degree interval from both the winding station and the unloading station, and the waiting position is also set at a 90-degree interval from both the winding station and the unloading station.

[0037] It should be noted that the "waiting position" referred to in this application is not limited to a fixed coordinate point, but can also be understood as a spatial area with a certain range. At this waiting position, the needle winding assembly 300 can be completely stationary or move slowly at a lower speed as needed to adapt to different process cycles. Similarly, the winding station, adhesive application station, unloading station, and other related stations or positions involved in this application are all subject to the same definition. It can be a precise single location point or an area that allows for some movement, and can be flexibly set according to the actual working conditions.

[0038] In step S12, after the preset number of turns of winding is completed, the needle assembly 300 located at the winding station moves out of the winding station and towards the adhesive application station, and finally arrives at the adhesive application station. The needle assembly 300 located in the waiting position moves to the winding station, and the needle assembly 300 located at the unloading station still performs the unloading operation.

[0039] At the winding station, the winding needle assembly 300 completes the preset number of turns according to the process requirements, indicating that the work at the winding station is complete, thus forming an intermediate semi-finished product of the battery cell. This state only represents the end of the operation at the winding station; what is obtained is not a complete battery cell, but a semi-finished battery cell that still needs further processing (diaphragm finishing, adhesive application, shaping, etc.). Furthermore, the aforementioned "preset number of turns" can be equal to or less than the final number of turns required for the finished battery cell. When the "preset number of turns" is less than the required number, the remaining turns can be completed by continuing to rotate the winding needle assembly 300 after it leaves the winding station. For example, if the finished battery cell requires 10 turns, 8 turns can be wound first at the winding station, and the remaining 2 turns can be completed after the winding needle assembly 300 leaves the winding station, followed by further processing such as diaphragm winding, adhesive application, and shaping.

[0040] The needle winding assembly 300, moving from the waiting position to the winding station, can initiate a new round of winding operations. The needle winding assembly 300, moving from the winding station to the adhesive application station, can then perform the adhesive application operation. During this process, the needle winding assembly 300 at the unloading station remains there to continue the unloading operation. Therefore, while waiting for unloading to complete, the other needle winding assemblies 300 can switch stations and perform corresponding operations, fully utilizing and reducing the waiting time between processes, thus significantly improving production efficiency.

[0041] Step S13: After the material feeding operation is completed, the needle winding assembly 300 located at the material feeding station moves to the waiting position, and the needle winding assembly 300 located at the adhesive application station moves to the material feeding station.

[0042] After the pin winding assembly 300 at the unloading station completes its unloading, the pin winding assembly 300 at the adhesive application station also completes its adhesive application. Next, the pin winding assembly 300 at the adhesive application station can be moved to the unloading station for unloading, while the unloaded, empty pin winding assemblies 300 are moved to waiting positions, ready to enter the winding station for the next round of winding operations. At this point, the state of each pin winding assembly 300 returns to the initial configuration state in step S11 above, i.e., the winding station, unloading station, and waiting positions are all assigned corresponding pin winding assemblies 300. This cycle continues, with each pin winding assembly 300 flowing orderly between the stations, thereby achieving continuous cell fabrication.

[0043] In one embodiment, the needle winding assembly 300 located at the unloading station and the needle winding assembly 300 located at the adhesive application station are synchronously driven to move to the waiting position and the unloading station, respectively. Specifically, the same drive mechanism can be used to drive the two needle winding assemblies 300 to revolve synchronously around the first rotation axis to achieve station switching, thereby helping to further improve efficiency and simplify control logic.

[0044] Please refer to the following for details. Figure 5 , Figure 6 and Figure 7 When the needle winding assemblies 300 switch positions, two rotating mechanisms, namely the first rotating mechanism 100 and the second rotating mechanism 200, are used for driving. The first rotating mechanism 100 and the second rotating mechanism 200 can each be equipped with a clutch structure to engage or disengage with the corresponding needle winding assembly 300. Only the needle winding assembly 300 engaged with the driving end of the first rotating mechanism 100 can revolve with it; similarly, only the needle winding assembly 300 engaged with the driving end of the second rotating mechanism 200 can revolve with it. This design using two separate rotating mechanisms significantly improves the flexibility of position switching and the timing matching capability.

[0045] More specifically, in this embodiment, the first rotating mechanism 100 includes a first driving component 110, a rotating rod 120, and an annular track 130. The first driving component 110 is connected to the rotating rod 120 in a transmission manner. The annular track 130 is arranged around the circumference of the rotating rod 120, and both the annular track 130 and the rotating rod 120 are coaxial with the first rotation axis. Each needle winding assembly 300 can be slidably mounted on the annular track 130 and can engage or disengage from the rotating rod 120. Any one or more needle winding assemblies 300 engaged with the rotating rod 120 can slide along the annular track 130 under the drive of the rotating rod 120.

[0046] The driving end of the first rotating mechanism 100 is the rotating rod 120. When the first driving assembly 110 drives the rotating rod 120 to rotate around its own axis, that is, the first rotating axis, the needle winding assembly 300, which is engaged with the rotating rod 120, will be driven to revolve around the first rotating axis along the annular track 130. The annular track 130 can provide continuous and rigid support for each needle winding assembly 300, so that it maintains a stable posture during the revolution and avoids displacement or vibration due to centrifugal force or gravity. It can be seen that the first rotating mechanism 100 can stably and reliably drive multiple needle winding assemblies 300 to revolve synchronously under the support of the annular track 130, effectively improving the positional accuracy and running stability of the needle winding assembly 300 during high-speed movement.

[0047] A first clutch mechanism 400 is provided between each needle winding assembly 300 and the rotating rod 120. Each needle winding assembly 300 is connected to a first retaining member 410. The first clutch mechanism 400 includes a first driving member 420 mounted on the rotating rod 120 and a first sliding plate 430 pulsatorically connected to the first driving member 420. The first sliding plate 430 has a first retaining groove adapted to the first retaining member 410. The first driving member 420 can drive the first sliding plate 430 to slide along the rotating rod 120 and force the first retaining member 410 to engage or disengage from the first retaining groove. When the first retaining member 410 engages with the first retaining groove, the needle winding assembly 300 engages with the rotating rod 120, that is, establishes a connection with the driving end of the first rotating mechanism 100; when the first retaining member 410 disengages from the first retaining groove, the needle winding assembly 300 disengages from the rotating rod 120, that is, disconnects from the driving end of the first rotating mechanism 100.

[0048] Furthermore, the second rotating mechanism 200 includes a second driving assembly 210 and a swing plate 220. The swing plate 220 is rotatably sleeved on the rotating rod 120 and is connected to the second driving assembly 210 for transmission. The swing plate 220 can selectively engage with the needle winding assembly 300. A gap may be left between the swing plate 220 and the rotating rod 120 to achieve a loose fit, so that the swing plate 220 does not rotate with the rotating rod 120. Of course, the swing plate 220 can also be rotatably mounted on the rotating rod 120 by bearings or other components.

[0049] Driven by the second drive assembly 210, the swing plate 220 reciprocates around the axis of the rotating rod 120, i.e., the first rotation axis. Since the rotational motion of the rotating rod 120 is not transmitted to the swing plate 220, their movements are independent. The second rotation mechanism 200 can independently drive the needle coil assembly 300 to move around the rotating rod 120 without relying on it. When the second rotation mechanism 200 needs to adjust the position of a needle coil assembly 300, the swing plate 220 can first rotate to the angle corresponding to that needle coil assembly 300 and engage with it. Subsequently, the second drive assembly 210 drives the swing plate 220 to rotate around the first rotation axis, thereby moving the needle coil assembly 300 along the annular guide rail 130. When switching to another needle coil assembly 300, the swing plate 220 first separates from the current needle coil assembly 300, then rotates to the target position and engages.

[0050] A second clutch mechanism 500 is provided on the swing plate 220. Each needle winding assembly 300 is connected to a second holding member 510. The second clutch mechanism 500 includes a second driving member 520 mounted on the swing plate 220 and a second sliding plate 530 pulsatorically connected to the second driving member 520. The second sliding plate 530 has a second slot 531 adapted to the second holding member 510. The second driving member 520 can drive the second sliding plate 530 to slide along the swing plate 220 and force the second holding member 510 to engage or disengage from the second slot 531. When the second holding member 510 engages with the second slot 531, the needle winding assembly 300 engages with the swing plate 220, that is, establishes a connection with the driving end of the second rotation mechanism 200; when the second holding member 510 disengages from the second slot 531, the needle winding assembly 300 separates from the swing plate 220, that is, disconnects from the driving end of the second rotation mechanism 200.

[0051] More specifically, in step S12 above, the first rotating mechanism 100 drives the needle winding assembly 300 at the waiting position to move to the winding station, and the second rotating mechanism 200 drives the needle winding assembly 300 located at the winding station to move out of the winding station and towards the adhesive application station, and finally arrive at the adhesive application station. That is, in step S12 above, when the needle winding assembly 300 at the waiting position and the needle winding assembly 300 at the winding station switch positions, they are driven by different rotating mechanisms, which helps to achieve differentiation in speed and arrival timing between the two.

[0052] Furthermore, in one embodiment, in step S13 above, the first rotating mechanism 100 synchronously drives the needle winding assembly 300 located at the unloading station and the adhesive application station to move to the waiting position and the unloading station respectively. After the unloading operation is completed, it is only necessary to engage the needle winding assembly 300 located at the unloading station and the adhesive application station with the drive end of the first rotating mechanism 100 to realize the station switching, so the operation is more convenient and more efficient.

[0053] In one embodiment, in step S12 above, the step of the needle assembly 300 located at the winding station moving out of the winding station toward the adhesive application station and finally reaching the adhesive application station includes: the needle assembly 300 moved out of the winding station first moves to the middle position between the winding station and the adhesive application station and stays there; the diaphragm material strip connected to the battery cell on the needle assembly 300 located at the middle position is cut; the needle assembly 300 then moves from the middle position to the adhesive application station.

[0054] In other words, when the needle winding assembly 300 enters the winding station from its waiting position, it remains in the middle position between the winding and adhesive application stations, before it has even entered the adhesive application station. While in this middle position, the diaphragm strip is cut. Only after the diaphragm strip is cut does the needle winding assembly 300 continue moving to the adhesive application station. The newly entered needle winding assembly 300 can then pick up the end of the diaphragm strip and begin the next round of winding. Thus, when the newly entered needle winding assembly 300 is ready to start a new round of winding, the diaphragm strip pulled by the needle winding assembly 300 that just exited the winding station is only pulled out a short length, which facilitates the newly entered needle winding assembly 300 in easily capturing and clamping the end of the diaphragm strip, thereby reducing the difficulty of starting the winding process.

[0055] After the step of cutting the separator tape connected to the battery cell in the intermediate position of the needle winding assembly 300, the method further includes pressing the free section formed by cutting the separator tape onto the surface of the battery cell. This prevents the free section of the separator tape from swinging during the movement of the needle winding assembly 300 towards the adhesive application station, thus preventing the separator on the battery cell from becoming loose. Of course, the pressing and rewinding of the separator tape can also be performed after the needle winding assembly 300 reaches the adhesive application station.

[0056] In step S12 above, after the needle winding assembly 300 in the waiting position enters the winding station, the specific situations in which the needle winding assembly 300, which has been displaced from the winding station, stops at the intermediate position between the winding station and the adhesive application station include the following three: In one embodiment, after completing a preset number of winding turns, the needle assembly 300 displaced from the winding station first moves to the middle position and stays there; the needle assembly 300 in the waiting position then moves to the winding station. That is, the needle assembly 300 displaced from the winding station first reaches the middle position and then stops moving to wait for the needle assembly 300 displaced from the waiting position to arrive at the winding station. Specifically, after completing the preset number of winding turns, the needle assemblies 300 in the winding station and the waiting position can start synchronously at the same speed. Therefore, the needle assembly 300 displaced from the winding station can first reach the middle position, and then stay there to wait for the needle assembly 300 displaced from the waiting position to arrive at its position.

[0057] Of course, in another embodiment, the needle winding assembly 300 that moves out from the waiting position may arrive at the winding station first; the needle winding assembly 300 that moves out from the winding station may then reach the intermediate position and remain there. Specifically, after completing a preset number of windings, the needle winding assemblies 300 at the winding station and the waiting position start synchronously, but the allowed speed of the needle winding assembly 300 at the waiting position is faster. Thus, when the needle winding assembly 300 that moves out from the waiting position reaches the winding station, the needle winding assembly 300 that moves out from the winding station needs to continue moving for a period of time before reaching the intermediate position. Specifically, the speed difference between the two can be achieved by controlling the speed and starting timing of the first rotating mechanism 100 and the second rotating mechanism 200.

[0058] In another embodiment, the needle assembly 300 that has moved out from the winding station may reach the winding station at the same time that the needle assembly 300 that has moved out from the waiting position reaches the intermediate position.

[0059] For more details, please see Figure 3 To ensure that the two needle assemblies 300 moving from the winding station and the waiting position move into place simultaneously, in one embodiment, step S12 includes: step S121, after completing a preset number of windings, the needle assembly 300 moving from the winding station moves towards the adhesive application station at a first speed, and the needle assembly 300 moving from the waiting position moves towards the winding station at a second speed greater than the first speed; step S122, when the needle assembly 300 moving from the waiting position reaches the winding station, the needle assembly 300 moving from the winding station reaches the intermediate position. That is, since the needle assembly 300 moving from the winding station moves towards the adhesive application station at a slower speed, its arrival time can be delayed, so that when the needle assembly 300 at the waiting position enters the winding station, the needle assembly 300 moving from the winding station is exactly at the aforementioned intermediate position. Similarly, the speed difference between the two can be achieved by controlling the speeds of the first rotating mechanism 100 and the second rotating mechanism 200.

[0060] Please see Figure 4In order to ensure that the two needle winding assemblies 300 moving from the winding station and the waiting position move into place simultaneously, in another embodiment, the above step S12 includes: step S121', before completing a preset number of winding turns, the needle winding assembly 300 located at the waiting position first starts moving towards the winding station; step S122', after completing the preset number of winding turns, the needle winding assembly 300 located at the winding station then moves towards the adhesive application station; when the needle winding assembly 300 moved from the waiting position arrives at the winding station, the needle winding assembly 300 moved from the winding station reaches the intermediate position. Since the needle winding assembly 300 at the waiting position has started in advance, the circumferential interval between the two will be smaller than the normal station spacing (i.e., less than 90°), so that after the needle winding assembly 300 at the original waiting position enters the winding station, the needle winding assembly 300 moved from the winding station will not immediately reach the adhesive application station, but will be in the intermediate position.

[0061] Preferably, after completing a preset number of windings, the needle winding assembly 300 located at the winding station moves synchronously with the needle winding assembly 300 that has moved out of the waiting position. The timing difference between the two can be achieved by controlling the start-up timing of the first rotation mechanism 100 and the second rotation mechanism 200. In this way, there is no need to adjust the speed of the needle winding assembly 300 throughout the process. Each needle winding assembly 300 can maintain the same constant speed around the first rotation axis after starting, thereby simplifying the motion control logic, reducing the difficulty of adjustment, and improving the stability and reliability of the equipment operation.

[0062] Furthermore, in one embodiment, as the needle winding assembly 300 moves from the middle position to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm strip. This effectively utilizes the time spent by the needle winding assembly 300 during station switching to perform the finishing roll operation, thus further improving efficiency.

[0063] Of course, the diaphragm strip can also be cut at the middle position, and the free section of the diaphragm strip can be immediately wound up at the middle position. This can effectively prevent the free section of the diaphragm strip from loosening during the station change process of the needle winding assembly 300. Alternatively, the needle winding assembly 300 can be moved from the middle position to the adhesive application station before the free section of the diaphragm strip connected to it is wound up.

[0064] The following is combined Figure 2 The overall process of the cell winding method in the above embodiments is described below: For ease of description, the three needle winding assemblies 300 are labeled as No. 1, No. 2, and No. 3, respectively. In their initial state, needle winding assemblies 300 300 are located at the winding station, the unloading station, and the waiting position, respectively. See the attached diagram for details. Figure 2As shown in (a); after the No. 1 needle winding assembly 300 completes the winding operation, the No. 1 needle winding assembly 300 moves from the winding station to the middle position, the No. 3 needle winding assembly 300 moves from the waiting position to the winding station, while the No. 2 needle winding assembly 300 remains at the unloading station to continue the unloading operation. See details in [reference needed]. Figure 2 As shown in (b); next, the diaphragm strip connected to the first needle winding assembly 300 is cut, and the third needle winding assembly 300, which has entered the winding station, starts winding. The first needle winding assembly 300 continues to move from the middle position to the adhesive application station to perform the adhesive application operation, while the second needle winding assembly 300 remains at the unloading station to continue the unloading operation. See the details in the image below. Figure 2 As shown in (c); after the No. 2 needle winding assembly 300 completes the unloading operation, the No. 1 and No. 2 needle winding assemblies 300 synchronously revolve around the first rotation axis and move to the unloading station and waiting position respectively, as detailed in the reference. Figure 2 As shown in (d). At this time, the No. 1, No. 2 and No. 3 winding needle assemblies 300 are located at the unloading station, the waiting position and the winding station, respectively. By cycling in sequence, each winding needle assembly 300 can pass through the winding station, the adhesive application station and the unloading station in sequence, thereby realizing the continuous production of battery cells.

[0065] Furthermore, in another embodiment, in step S12 above, the step of the needle assembly 300 located at the winding station moving out of the winding station and into the adhesive application station includes: the needle assembly 300 moving out of the winding station continuously moves towards the adhesive application station and directly to the adhesive application station. That is, the needle assembly 300 moving out of the winding station does not stop midway and moves directly to the adhesive application station.

[0066] To further improve efficiency, the needle assembly 300, which has been displaced from the winding station, moves at a constant speed towards the adhesive application station. Specifically, this can be achieved by controlling the second rotating mechanism 200 to operate at a constant speed.

[0067] If the aforementioned "preset number of turns" equals the final number of turns required for the finished battery cell, meaning the winding needle assembly 300 has already completed the winding operation at the winding station, then the winding needle assembly 300 will not perform any further winding operation as it moves continuously from the winding station to the adhesive application station. Furthermore, when the winding needle assembly 300 reaches the adhesive application station, it cuts the separator strip connected to the battery cell and presses the free section formed by the cut separator strip onto the surface of the battery cell; a final winding operation is then performed on the free section of the separator strip. The purpose of pressing the free section of the separator strip is simply to keep the separator strip stable during the final winding process.

[0068] Of course, in order to improve efficiency, in other embodiments, the separator strip connected to the battery cell can also be cut during the continuous movement of the needle winding assembly 300 from the winding station to the adhesive application station.

[0069] However, in another embodiment, the aforementioned "preset number of turns" is less than the final number of turns required for the finished battery cell. That is, the winding needle assembly 300 has not yet completed the winding operation at the winding station. Therefore, as the winding needle assembly 300 continues to move from the winding station to the adhesive application station, it continues to perform the winding operation. In this way, the material strip needs to be continuously fed to achieve continuous winding and further improve efficiency.

[0070] Correspondingly, as the needle winding assembly 300 continuously moves from the winding station to the adhesive application station, the separator strip connected to the battery cell is cut. Specifically, the continuously conveyed strip can be cut using methods such as follow-up cutting or roller cutting. In this way, before the needle winding assembly 300, which has moved out of the winding station, reaches the adhesive application station, a new needle winding assembly 300 entering the winding station can start a new round of winding operations.

[0071] After the diaphragm strip is cut during the continuous movement of the needle winding assembly 300 from the winding station to the adhesive application station, the free section of the diaphragm strip can be wound up during this same movement. Alternatively, the wound up operation can be performed on the free section of the diaphragm strip after the needle winding assembly 300 has reached the adhesive application station.

[0072] In the aforementioned battery cell winding method, after completing a preset number of turns, the winding needle assembly 300 at the winding station first moves out of the winding station and finally arrives at the adhesive application station. The waiting needle assembly 300 moves into the winding station, while the needle assembly 300 at the unloading station continues its unloading operation. Once the needle assembly 300 at the unloading station has completed its unloading operation, the needle assemblies 300 at the adhesive application station and the unloading station can be moved to the unloading station and the waiting position, respectively. This cycle allows for continuous battery cell production. As can be seen, while waiting for unloading to complete, the remaining needle assemblies 300 can switch stations and perform corresponding operations, fully utilizing and compressing the waiting time between processes. Therefore, the aforementioned winding device and battery cell processing equipment can accelerate the production cycle, thereby improving production efficiency.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for winding a battery cell, characterized in that, include: In step S11, the needle winding assembly located at the unloading station performs the unloading operation, the needle winding assembly located at the winding station performs the winding operation, and the needle winding assembly located at the waiting position is in a waiting state. Step S12: After completing the preset number of turns of winding, the winding needle assembly located at the winding station moves out of the winding station and towards the adhesive application station, and finally arrives at the adhesive application station. The winding needle assembly located at the waiting position moves to the winding station, and the winding needle assembly located at the unloading station still performs the unloading operation. Step S13: After the material feeding operation is completed, the needle winding assembly located at the material feeding station moves to the waiting position, and the needle winding assembly located at the adhesive application station moves to the material feeding station.

2. The cell winding method according to claim 1, characterized in that, In step S12, the step of the needle assembly located at the winding station moving out of the winding station toward the adhesive application station and finally reaching the adhesive application station includes: the needle assembly moved out of the winding station first moves to the middle position between the winding station and the adhesive application station and stays there; the separator material tape connected to the battery cell on the needle assembly at the middle position is cut; the needle assembly then moves from the middle position to the adhesive application station.

3. The cell winding method according to claim 2, characterized in that, After the step of cutting the separator strip connected to the battery cell on the intermediate position winding needle assembly, the method further includes the step of pressing the free segment formed by cutting the separator strip onto the surface of the battery cell.

4. The cell winding method according to claim 2, characterized in that, Step 12 includes: after completing a preset number of turns of winding, the winding needle assembly that has been moved out from the winding station first reaches the middle position and stays there; the winding needle assembly that has been moved out from the waiting position then reaches the winding station.

5. The cell winding method according to claim 2, characterized in that, Step 12 includes: after completing a preset number of turns of winding, the winding needle assembly that has been moved out from the waiting position first arrives at the winding station; the winding needle assembly that has been moved out from the winding station then arrives at the intermediate position and stays there.

6. The cell winding method according to claim 2, characterized in that, Step 12 includes: after the preset number of turns of winding is completed, the winding needle assembly that has moved out from the winding station reaches the middle position, and at the same time, the winding needle assembly that has moved out from the waiting position reaches the winding station.

7. The cell winding method according to claim 6, characterized in that, Step 12 includes: after completing a preset number of turns of winding, the needle assembly displaced from the winding station moves toward the adhesive application station at a first speed, and the needle assembly displaced from the waiting position moves toward the winding station at a second speed greater than the first speed; when the needle assembly displaced from the waiting position reaches the winding station, the needle assembly displaced from the winding station reaches the intermediate position.

8. The cell winding method according to claim 6, characterized in that, Step 12 includes: before completing a preset number of windings, the winding needle assembly located at the waiting position first starts to move towards the winding station; after completing the preset number of windings, the winding needle assembly located at the winding station moves towards the adhesive application station; when the winding needle assembly moved out of the waiting position reaches the winding station, the winding needle assembly moved out of the winding station reaches the intermediate position.

9. The cell winding method according to claim 8, characterized in that, After the preset number of turns are completed, the winding needle assembly located at the winding station moves synchronously with the winding needle assembly that has moved out of the waiting position.

10. The cell winding method according to any one of claims 2 to 9, characterized in that, During the process of the needle winding assembly moving from the intermediate position to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm material strip; or, a finishing roll operation is performed on the free section of the diaphragm material strip at the intermediate position; or, after the needle winding assembly moves to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm material strip.

11. The cell winding method according to claim 1, characterized in that, In step S12, the step of moving the needle assembly located at the winding station out of the winding station and into the adhesive application station includes: the needle assembly moving out of the winding station continuously moving towards the adhesive application station and moving directly to the adhesive application station.

12. The cell winding method according to claim 11, characterized in that, The needle assembly displaced from the winding station moves at a constant speed toward the adhesive application station.

13. The cell winding method according to claim 11, characterized in that, When the needle winding assembly moves to the adhesive application station, it cuts the separator strip connected to the battery cell and presses the free section formed by the cut separator strip onto the surface of the battery cell; and performs a finishing winding operation on the free section of the separator strip.

14. The cell winding method according to claim 11, characterized in that, As the needle winding assembly moves continuously from the winding station to the adhesive application station, the needle winding assembly continues to perform the winding operation.

15. The cell winding method according to claim 11 or 14, characterized in that, As the needle winding assembly moves continuously from the winding station to the adhesive application station, the diaphragm strip connected to the battery cell is cut.

16. The cell winding method according to claim 15, characterized in that, During the continuous movement of the needle winding assembly from the winding station to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm strip; or, after the needle winding assembly moves to the adhesive application station, a finishing roll operation is performed on the free section of the diaphragm strip.

17. The cell winding method according to claim 1, characterized in that, Step S13 includes: synchronously driving the needle winding assembly located at the unloading station and the adhesive application station to move to the waiting position and the unloading station respectively.

18. The cell winding method according to claim 1, characterized in that, In step S12, the first rotating mechanism drives the needle assembly at the waiting position to move to the winding station, and the second rotating mechanism drives the needle assembly located at the winding station to move out of the winding station toward the adhesive application station, and finally arrive at the adhesive application station.

19. The cell winding method according to claim 18, characterized in that, In step S13, the first rotating mechanism synchronously drives the needle winding assembly located at the unloading station and the adhesive application station to move to the waiting position and the unloading station respectively.

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