Battery cell winding method

Abstract

The present application relates to a kind of winding methods of battery cell, when certain winding needle assembly is completed with the operation of glue sticking and blanking, first to the winding station moves to waiting position, and the winding needle assembly in the winding station does not need to shift, to continue to execute winding operation;After winding is completed, the winding needle assembly in the winding station is removed again, to facilitate the operation such as glue sticking, blanking, and the winding needle assembly in the waiting position is moved to the winding station, to execute winding operation again. Since the displacement from the waiting position into the winding station is less than the displacement from the blanking station directly into the winding station, the length of time of station switching can be greatly shortened, and the waiting time between processes is fully utilized and compressed. Therefore, the above-mentioned winding method of battery cell can speed up the production rhythm, so as to improve 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 combining the positive electrode, negative electrode, and separator, and then applying adhesive at the end to form a wound cell. To achieve continuous winding, three sets of winding needle assemblies are typically used. These three sets 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 cell, respectively. However, in actual production, the winding process is time-consuming, while the adhesive application and unloading processes are relatively quick due to their simplicity. Under current methods, the winding needle assembly that has completed the adhesive application and unloading processes generally needs to remain at its current station for a considerable period until another winding needle assembly completes its winding process before switching stations. This results in excessively high waiting time during production, hindering production cycle time and ultimately making it difficult to improve 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: Step S11: The needle winding assembly located at the winding station performs a winding operation, and the needle winding assembly located at the waiting position is in a waiting state. Step S12: After the winding operation is completed, the winding needle assembly located at the winding station moves out of the winding station, and the winding needle assembly located at the waiting position moves to the winding station.

[0005] In one embodiment, step S12 is: synchronously driving the needle assembly located at the winding station and the waiting position to move to the middle position and the winding station respectively; then individually driving the needle assembly located at the middle position to move to the adhesive application station.

[0006] In one embodiment, when the needle winding assembly moves to the intermediate position, the diaphragm strip connected to the battery cell is cut, and the free section formed by cutting the diaphragm strip is pressed onto the surface of the battery cell.

[0007] In one embodiment, as the needle winding assembly moves from the intermediate position to the adhesive application station, a finishing winding operation is performed on the free section of the diaphragm tape. Alternatively, a winding operation can be performed on the free section of the diaphragm strip at the intermediate position; Alternatively, after the needle winding assembly moves to the adhesive application station, the free section of the diaphragm strip is wound up.

[0008] In one embodiment, step S12 is: driving the needle assembly located at the winding station to move directly to the adhesive application station, and driving the needle assembly located at the waiting position to move to the winding station.

[0009] In one embodiment, when the needle winding assembly moves to the adhesive application station, the separator strip connected to the battery cell is cut off, and the free section formed by cutting the separator strip is pressed onto the surface of the battery cell; then the free section of the separator strip is rolled up and adhesive is applied.

[0010] In one embodiment, when the needle winding assembly at the winding station performs the winding operation, the needle winding assembly at the unloading station moves to the waiting position, and the needle winding assembly at the adhesive application station moves to the second waiting position.

[0011] In one embodiment, step S11 further includes: when the winding needle assembly located at the winding station performs the winding operation, it synchronously drives the winding needle assemblies located at the unloading station and the adhesive application station to move to the waiting position and the second waiting position, respectively.

[0012] In one embodiment, step S12 is as follows: after the winding operation is completed, the needle assembly located at the winding station, the waiting position and the second waiting position are synchronously driven to move to the middle position, the winding station and the unloading station respectively; then the needle assembly located at the middle position is driven separately to move to the adhesive application station.

[0013] In one embodiment, step S12 is as follows: using a first rotating mechanism to synchronously drive the needle assembly located at the winding station, the waiting position and the second waiting position to move to the middle position, the winding station and the unloading station respectively; and then using a second rotating mechanism to drive the needle assembly located at the middle position to move to the adhesive application station.

[0014] In one embodiment, step S12 is as follows: after the winding operation is completed, the needle assembly located at the waiting position and the second waiting position is synchronously driven to move to the winding station and the unloading station respectively, and the needle assembly located at the winding station is driven to move directly to the adhesive application station.

[0015] In one embodiment, step S12 is as follows: using a first rotating mechanism to synchronously drive the needle winding assembly located at the waiting position and the needle winding assembly located at the second waiting position to move to the winding station and the unloading station respectively; and using a second rotating mechanism to drive the needle winding assembly located at the winding station to move directly to the adhesive application station.

[0016] In the aforementioned cell winding method, after a certain needle assembly completes the adhesive application and unloading operations, it first moves to the waiting position towards the winding station. The needle assemblies already at the winding station do not need to move and can continue the winding operation. After winding is complete, the needle assemblies in the winding station are moved out to facilitate adhesive application and unloading operations, while the needle assemblies in the waiting position move to the winding station to perform the winding operation again. Since the displacement from the waiting position to the winding station is less than the displacement from the unloading station directly to the winding station, the station switching time can be significantly shortened, and the waiting time between processes is fully utilized and compressed. Therefore, the aforementioned cell winding method can accelerate the production cycle, thereby improving production efficiency. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic flowchart of a cell winding method in one embodiment of the present invention; Figure 2 for Figure 1 The diagram shows a scenario illustrating the battery cell winding method. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Please see Figure 1 The battery cell winding method in one embodiment of the present invention includes steps S11 to S12.

[0026] In step S11, the needle winding assembly 100 located at the winding station performs a winding operation, and the needle winding assembly 100 located at the waiting position is in a waiting state.

[0027] At least two needle winding assemblies 100 are provided, and both needle winding assemblies 100 are capable of revolving around a first rotation axis, thereby achieving cyclic switching between different workstations. When the needle winding assembly 100 is located at the winding workstation, 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 clamped in the needle winding assembly 100 first, and then the needle winding assembly 100 can be driven to rotate to drive the electrode strip and the separator strip to wind and form a battery cell.

[0028] It is important to note that at the winding station, the winding operation is complete when the winding needle assembly 100 completes the preset number of turns according to the process requirements, thus forming an intermediate semi-finished product of the battery cell. This state only represents the end of the winding stage; 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 100 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 100 leaves the winding station, followed by further processing such as diaphragm winding, adhesive application, and shaping.

[0029] While one of the needle winding assemblies 100 is performing a winding operation, another needle winding assembly 100 located at the unloading station can perform an unloading operation. After unloading, the freed-up needle winding assembly 100 can return to the winding station to perform a winding operation again; while the needle winding assembly 100 located at the winding station, after completing its winding operation, moves out of the winding station to perform finishing operations such as applying adhesive, and finally moves to the unloading station to unload the battery cells from the needle winding assembly 100. This cycle continues, allowing the winding of the battery cells to proceed continuously.

[0030] In one specific embodiment, an adhesive application station is provided between the winding station and the unloading station, with the three stations circumferentially spaced along the first rotation axis. The winding needle assembly 100, having completed the winding operation, first enters the adhesive application station from the winding station to complete the final adhesive application to the battery cell; after adhesive application, the winding needle assembly 100 then enters the unloading station from the adhesive application station to unload and store the battery cell or transfer it to subsequent processes.

[0031] Furthermore, three needle winding assemblies 100 are provided. The three needle winding assemblies 100 can circulate between the winding station, the adhesive application station, and the unloading station. In this way, it can be ensured that the three needle winding assemblies 100 are respectively in the winding station, the adhesive application station, and the unloading station within the same time period, thereby realizing the parallel operation of the three processes of winding, adhesive application, and unloading, which is conducive to improving production efficiency.

[0032] The waiting position is usually located between the unloading station and the winding station. After a needle winding assembly 100 completes the adhesive application and unloading operations, it first moves from the unloading station to the winding station to the waiting position, rather than directly entering the winding station. At this time, the needle winding assembly 100 located at the winding station continues to perform the winding operation, while the needle winding assembly 100 located at the waiting position is in a waiting state and generally does not participate in any operation.

[0033] 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 100 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.

[0034] In one specific embodiment, since there are three needle winding assemblies 100, and the adhesive application operation on another needle winding assembly 100 is completed after the material feeding operation is finished, when the needle winding assembly 100 at the winding station performs the winding operation, after the material feeding and adhesive application operations are completed, the needle winding assembly 100 at the material feeding station moves towards the winding station to a waiting position, and the needle winding assembly 100 at the adhesive application station moves towards the material feeding station to a second waiting position. The needle winding assembly 100 at the second waiting position has not yet actually entered the material feeding station, so no material feeding operation is performed on it at this time.

[0035] To further improve efficiency, in one embodiment, the needle winding assembly 100 located at the unloading station and the adhesive application station are synchronously driven to move to the waiting position and the second waiting position, respectively. That is, the needle winding assembly 100 located at the unloading station and the adhesive application station can revolve around the first rotation axis under the drive of the same rotation mechanism, thereby realizing position switching.

[0036] Step S12: After the winding operation is completed, the needle assembly 100 located at the winding station moves out of the winding station, and the needle assembly 100 located in the waiting position moves to the winding station.

[0037] After the winding operation is completed, the winding needle assembly 100 is first moved out of the winding station, thus freeing up the winding station. This allows the waiting winding needle assembly 100 to move into the winding station. The winding needle assembly 100 moved into the winding station can then perform a winding operation again. For the winding needle assembly 100 that has moved out of the winding station, corresponding operations can be performed on the wound battery cells. Specifically, the wound battery cells are first moved from the winding station to the adhesive application station along with the winding needle assembly 100 for adhesive application.

[0038] At this point, since the displacement from the waiting position to the winding station is less than the displacement from the unloading station to the winding station, the idle time of the winding station during each station switch can be significantly shortened. Furthermore, the time required for the winding needle assembly 100 to move from the unloading station to the waiting position is included in the time spent waiting for the winding operation to complete, thus not consuming additional time. Therefore, this effectively reduces station switch time, fully utilizes and compresses the waiting time between processes, thereby contributing to improved cell production efficiency.

[0039] There are several possibilities for how the needle coil assembly 100 moves from the winding station to the adhesive application station. For example, in one embodiment, step S12 is as follows: the needle coil assembly 100 located at the winding station and the waiting position are simultaneously driven to move to the intermediate position and the winding station respectively; then the needle coil assembly 100 located at the intermediate position is driven separately to move to the adhesive application station.

[0040] Synchronous driving of multiple needle winding assemblies 100 can further improve efficiency. However, since the displacement required for a needle winding assembly 100 to enter the winding station from the waiting position is small, the synchronous driving distance is insufficient to drive the needle winding assembly 100 originally in the winding station directly into the adhesive application station. Instead, it can only drive the needle winding assembly 100 to the intermediate position between the winding station and the adhesive application station. At this point, the needle winding assembly 100 in the intermediate position needs to be driven individually until it moves to the adhesive application station. During this process, the needle winding assemblies 100 that have already entered the winding station can start the winding operation normally.

[0041] Furthermore, in one embodiment, when the winding needle assembly 100 located at the winding station moves to the intermediate position, the diaphragm strip connected to the battery cell is cut off, and the free section formed by cutting the diaphragm strip is pressed onto the surface of the battery cell.

[0042] When the completed winding needle assembly 100 exits the winding station and enters the intermediate position, a section of diaphragm strip will be pulled out due to the continuity of the strip. At this time, another winding needle assembly 100 in the unloading station is about to enter the winding station. To improve efficiency, the diaphragm strip needs to be cut and finished quickly after the other winding needle assembly 100 in the unloading station enters the winding station. This means that once the winding needle assembly 100 in the original winding station enters the intermediate position, the free section formed by the cut diaphragm strip can be pressed onto the surface of the battery cell immediately, and the finishing operation can be completed quickly without waiting for the winding needle assembly 100 to continue moving from the intermediate position to the next station before cutting and finishing.

[0043] The purpose of this arrangement is to achieve parallel processing of the finishing action and the station switching. While the finishing action is being performed, another winding assembly 100, which has moved from the unloading station to the winding station, can simultaneously begin the next round of winding, without waiting for the finishing action to complete. This further shortens the idle waiting time between station switching and winding start, effectively improving the overall production cycle time. Simultaneously, timely holding the free section in the middle position also prevents the diaphragm from loosening or tangling as the winding assembly 100 continues to move towards the adhesive application station, ensuring the winding quality of the battery cells.

[0044] Furthermore, as the needle winding assembly 100 moves from the middle position to the adhesive application station, a finishing winding operation is performed on the free section of the diaphragm strip.

[0045] Alternatively, the diaphragm strip can be cut in the middle, and the free section of the diaphragm strip can be wound up immediately at the middle position. Alternatively, the winding needle assembly 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.

[0046] For a configuration with three needle winding assemblies 100, where the three needle winding assemblies 100 can alternately cycle between the winding station, the adhesive application station, and the unloading station, step S12 is as follows: The needle winding assemblies 100 located at the winding station, the waiting position, and the second waiting position are synchronously driven to move to the middle position, the winding station, and the unloading station, respectively; then, the needle winding assembly 100 located at the middle position is individually driven to move to the adhesive application station. That is, after the winding operation is completed, the three needle winding assemblies 100 first move synchronously along the circumferential direction of the first rotation axis, and then the needle winding assembly 100 at the middle position is individually moved to the adhesive application station.

[0047] Further, in one embodiment, the above step S12 is: using a first rotating mechanism to synchronously drive the needle winding assembly 100 located at the winding station, the waiting position and the second waiting position to move to the middle position, the winding station and the unloading station respectively; and then using a second rotating mechanism to drive the needle winding assembly 100 located at the middle position to move to the adhesive application station.

[0048] The first rotating mechanism is responsible for the overall revolution of all needle winding assemblies 100, ensuring the synchronization of their operating rhythm; while the second rotating mechanism can independently adjust the position of a single needle winding assembly 100, allowing it to perform phase compensation and position adjustment within the winding station without affecting the normal operation of other needle winding assemblies 100. The design of using two separate rotating mechanisms significantly improves the flexibility of station switching and the timing matching capability.

[0049] Specifically, a clutch structure can be provided so that the drive end of the first rotating mechanism can engage or disengage with each needle winding assembly 100, and the drive end of the second rotating mechanism can selectively engage with one of the needle winding assemblies 100. The first rotating mechanism can simultaneously drive only some, not all, of the needle winding assemblies 100 to revolve around the first rotation axis. Specifically, only the needle winding assemblies 100 engaged with the drive end of the first rotating mechanism can revolve with the first rotating mechanism, while the needle winding assemblies 100 disengaged from the drive end of the first rotating mechanism cannot revolve with the first rotating mechanism. The drive end of the second rotating mechanism can only engage with one of the needle winding assemblies 100 at a time, so the second rotating mechanism 20 can only drive one needle winding assembly 100 to move circumferentially along the first rotation axis at a time. Moreover, to avoid interference, each needle winding assembly 100 can only engage with the drive end of at most one of the first and second rotating mechanisms at a time.

[0050] In this way, after the needle winding assembly 100 at the adhesive application station and the unloading station completes the adhesive application and unloading, and during the station switching process, it can be driven by the first rotating mechanism to move to its respective waiting position. The needle winding assembly 100 at the winding station that has not yet completed winding will be separated from the drive end of the first rotating mechanism, so it will not revolve with the first rotating mechanism and will continue to perform winding operations at the winding station. After winding is completed, the needle winding assembly 100 at the winding station engages with the drive end of the first rotating mechanism, and the first rotating mechanism starts again. While driving the needle winding assemblies 100 located at the waiting position and the second waiting position into the winding station and the unloading station respectively, it also drives the needle winding assembly 100 in the original winding station to move to the middle position.

[0051] Next, the coiling needle assembly 100, which is in the middle position, separates from the drive end of the first rotating mechanism again and engages with the drive end of the second rotating mechanism. Finally, it is driven by the second rotating mechanism to continue moving until it reaches the next station, namely the adhesive application station.

[0052] For example, in another embodiment, step S12 is as follows: the needle winding assembly 100 located at the winding station is driven directly to the adhesive application station, and the needle winding assembly located at the waiting position is driven to the winding station. That is, the needle winding assembly 100 at the waiting position and the needle winding assembly 100 at the winding station are driven independently, and the needle winding assembly 100 at the winding station directly enters the next station without stopping in the middle. This provides greater flexibility in process control, and the actions of different needle winding assemblies 100 do not interfere with each other.

[0053] Furthermore, in another embodiment described above, when the needle winding assembly 100 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; then, a finishing roll operation is performed on the free section of the separator strip, and adhesive is applied. The adhesive application station is generally equipped with a finishing and adhesive application mechanism. After the needle winding assembly 100 reaches the adhesive application station, the separator strip connected to the battery cell can be connected, and the finishing roll and adhesive application operation is performed by the finishing and adhesive application mechanism.

[0054] Of course, in other embodiments, the diaphragm cutting and finishing roll operation can be performed during the process of the needle winding assembly 100 moving from the winding station to the adhesive application station, and the adhesive application can be performed after the needle winding assembly 100 reaches the adhesive application station.

[0055] Similarly, for a case where three needle winding assemblies 100 are provided, and the three needle winding assemblies 100 can alternately cycle between the winding station, the adhesive application station, and the unloading station, the above step S12 is: synchronously drive the needle winding assemblies 100 located at the waiting position and the second waiting position to move to the winding station and the unloading station respectively, and drive the needle winding assembly 100 located at the winding station to move directly to the adhesive application station.

[0056] More specifically, step S12 is as follows: the first rotating mechanism synchronously drives the needle winding assembly located at the waiting position and the needle winding assembly 100 located at the second waiting position to move to the winding station and the unloading station respectively; and the second rotating mechanism drives the needle winding assembly located at the winding station to move directly to the adhesive application station.

[0057] At this time, the first rotating mechanism is responsible for the revolution of two of the needle winding assemblies 100, ensuring the synchronization of their operating rhythm; while the second rotating mechanism can independently adjust the position of a single needle winding assembly 100, enabling it to perform phase compensation and station switching within the winding station without affecting the normal operation of other needle winding assemblies 100. In this way, the flexibility of station switching is further improved.

[0058] Specifically, a clutch structure can be provided so that the drive end of the first rotating mechanism can engage or disengage with the two needle winding assemblies 100 in the adhesive application station and the unloading station, and the drive end of the second rotating mechanism can engage with the needle winding assembly 100 in the winding station. The first rotating mechanism can first simultaneously drive the two needle winding assemblies 100 to the waiting position and the second waiting position respectively, and then simultaneously drive them to the winding station and the unloading station respectively. The second rotating mechanism can drive the needle winding assembly 100 in the winding station to adjust its position within the station to achieve phase compensation, and after winding is completed, directly drive the needle winding assembly 100 to the adhesive application station.

[0059] The following is combined Figure 2Taking the case with three winding needle assemblies 100 as an example, the overall process of the above-mentioned battery cell winding method is described as follows: For ease of description, the three needle winding assemblies 100 are labeled as No. 1, No. 2, and No. 3, respectively. In their initial state, needle winding assemblies 100 1, 2, and 3 are located at the winding station, the adhesive application station, and the unloading station, respectively, and are performing winding, adhesive application, and unloading operations. See the attached document for details. Figure 2 As shown in (a); after the battery cells on No. 2 and No. 3 winding needle assemblies 100 have completed the adhesive application and unloading operations, No. 2 and No. 3 winding needle assemblies 100 move towards the winding station until they reach the waiting position and the second waiting position, respectively. No. 1 winding needle assembly 100 then remains at the winding station to perform the winding operation. See the details below. Figure 2 As shown in (b); after the first needle winding assembly 100 completes winding and reaches the middle position, the second and third needle winding assemblies 100 move from the waiting position and the second waiting position to the winding station and the unloading station, respectively. Then, the first needle winding assembly 100 is driven separately to continue moving to the adhesive application station, as detailed in [reference needed]. Figure 2 As shown in (c). At this time, needle winding assemblies 100 1, 2, and 3 are located at the adhesive application station, the unloading station, and the winding station, respectively. By cycling through these stations, each needle winding assembly 100 can sequentially pass through the winding station, the adhesive application station, and the unloading station.

[0060] In the aforementioned cell winding method, after a certain needle winding assembly 100 completes the adhesive application and unloading operations, it first moves to the waiting position towards the winding station. The needle winding assembly 100 already at the winding station does not need to be moved and can continue the winding operation. After winding is completed, the needle winding assembly 100 in the winding station is moved out to facilitate adhesive application and unloading operations. The needle winding assembly 100 in the waiting position then moves to the winding station to perform the winding operation again. Since the displacement from the waiting position to the winding station is less than the displacement from the unloading station directly to the winding station, the station switching time can be significantly shortened, and the waiting time between processes is fully utilized and compressed. Therefore, the aforementioned cell winding method can accelerate the production cycle, thereby improving production efficiency.

[0061] 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.

[0062] 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: Step S11: The needle winding assembly located at the winding station performs a winding operation, and the needle winding assembly located at the waiting position is in a waiting state. Step S12: After the winding operation is completed, the winding needle assembly located at the winding station moves out of the winding station, and the winding needle assembly located at the waiting position moves to the winding station.

2. The cell winding method according to claim 1, characterized in that, Step S12 is as follows: synchronously drive the needle winding assembly located at the winding station and the waiting position to move to the middle position and the winding station respectively; then drive the needle winding assembly located at the middle position to move to the adhesive application station separately.

3. The cell winding method according to claim 2, characterized in that, When the needle winding assembly moves to the intermediate position, it cuts the diaphragm strip connected to the battery cell and presses the free section formed by cutting the diaphragm strip onto the surface of the battery cell.

4. The cell winding method according to claim 3, characterized in that, During the process of the needle winding assembly moving from the middle position to the adhesive application station, a finishing winding operation is performed on the free section of the diaphragm material strip; Alternatively, a winding operation can be performed on the free section of the diaphragm strip at the intermediate position; Alternatively, after the needle winding assembly moves to the adhesive application station, the free section of the diaphragm strip is wound up.

5. The cell winding method according to claim 1, characterized in that, Step S12 is as follows: drive the needle assembly located at the winding station to move directly to the adhesive application station, and drive the needle assembly located at the waiting position to move to the winding station.

6. The cell winding method according to claim 5, 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; then it performs a finishing winding operation on the free section of the separator strip and applies adhesive.

7. The cell winding method according to claim 1, characterized in that, When the winding needle assembly at the winding station performs the winding operation, the winding needle assembly at the unloading station moves to the waiting position, and the winding needle assembly at the adhesive application station moves to the second waiting position.

8. The cell winding method according to claim 7, characterized in that, Step S11 further includes: when the winding needle assembly located at the winding station performs the winding operation, it synchronously drives the winding needle assemblies located at the unloading station and the adhesive application station to move to the waiting position and the second waiting position, respectively.

9. The cell winding method according to claim 7, characterized in that, Step S12 is as follows: After the winding operation is completed, the winding needle assembly located at the winding station, the waiting position and the second waiting position are synchronously driven to move to the middle position, the winding station and the unloading station respectively; then the winding needle assembly located at the middle position is driven separately to move to the adhesive application station.

10. The cell winding method according to claim 9, characterized in that, Step S12 is as follows: the first rotating mechanism synchronously drives the needle winding assembly located at the winding station, the waiting position and the second waiting position to move to the middle position, the winding station and the unloading station respectively; then the second rotating mechanism drives the needle winding assembly located at the middle position to move to the adhesive application station.

11. The cell winding method according to claim 7, characterized in that, Step S12 is as follows: After the winding operation is completed, the winding needle assembly located at the waiting position and the second waiting position is synchronously driven to move to the winding station and the unloading station respectively, and the winding needle assembly located at the winding station is driven to move directly to the adhesive application station.

12. The cell winding method according to claim 11, characterized in that, Step S12 is as follows: the first rotating mechanism synchronously drives the needle winding assembly located at the waiting position and the needle winding assembly located at the second waiting position to move to the winding station and the unloading station respectively; and the second rotating mechanism drives the needle winding assembly located at the winding station to move directly to the adhesive application station.

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