First-layer tab margin control method and computer-readable storage medium

Abstract

The embodiment of the application provides a kind of first layer tab margin control method and computer readable storage medium, including the following steps: obtaining the moving distance of pole piece by roller feeding mechanism to the multiple preset positions of needle;Multiple moving distances are converted to obtain multiple rotation angles of needle, and target rotation angle and maximum rotation angle are determined from multiple rotation angles;Control needle uniform acceleration motion and control roller feeding mechanism synchronous rotation, until needle rotates from starting angle to target rotation angle;In the process that needle rotates from target rotation angle to maximum rotation angle, control needle uniform speed first and then deceleration or deceleration all the time, and control roller feeding mechanism synchronous rotation.By the above control mode, the embodiment of the application can improve the control precision of the first layer tab margin of battery cell to meet the accuracy requirement.

Description

Technical Field

[0001] This application belongs to the field of battery manufacturing technology, and in particular relates to a method for controlling the edge distance of the first-layer electrode tab and a computer-readable storage medium. Background Technology

[0002] In related technologies, the precise control of the edge distance of the first-layer tabs in battery cells is a major pain point for winding machines in the new energy industry. If the edge distance precision of the first-layer tabs does not meet the requirements during winding, the anode may not be able to completely cover the cathode, potentially causing short circuits or explosions in the battery cell. Therefore, it is essential to ensure the required edge distance precision of the first-layer tabs during winding. However, in actual winding processes, because there is a certain distance between the feed section and the winding needle, and they belong to different mechanisms, it is difficult to ensure that the movements of the two mechanisms remain consistent during winding, making it difficult to further improve the control precision of the edge distance of the first-layer tabs. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] This application provides a method for controlling the first-layer tab distance and a computer-readable storage medium, which can improve the control accuracy of the first-layer tab distance of the battery cell.

[0005] In a first aspect, embodiments of this application provide a method for controlling the edge distance of the first-layer electrode tab, applied to a winding device. The winding device includes a winding needle and a roller feeding mechanism. The roller feeding mechanism is used to transport the electrode sheet to the winding needle for winding. The method includes: obtaining the movement distance of the electrode sheet from the roller feeding mechanism to multiple preset positions of the winding needle; converting the multiple movement distances to obtain multiple rotation angles of the winding needle, and determining a target rotation angle and a maximum rotation angle from the multiple rotation angles; controlling the winding needle to move at a uniform acceleration and controlling the roller feeding mechanism to rotate synchronously until the winding needle rotates from the starting angle to the target rotation angle; during the process of the winding needle rotating from the target rotation angle to the maximum rotation angle, controlling the winding needle to first move at a uniform speed and then decelerate or continuously decelerate, and controlling the roller feeding mechanism to rotate synchronously.

[0006] In some embodiments, the plurality of moving distances include: a first moving distance by which the electrode is moved by the roller feeding mechanism to the winding needle, a second moving distance by which the electrode is moved by the roller feeding mechanism to wind the winding needle to reach a target number of turns, and a third moving distance by which the electrode is moved by the roller feeding mechanism to the winding needle after pre-winding.

[0007] In some embodiments, converting the plurality of moving distances to obtain a plurality of rotation angles of the winding needle, and determining a target rotation angle and a maximum rotation angle from the plurality of rotation angles, includes: converting the first moving distance, the second moving distance, and the third moving distance respectively to obtain a first rotation angle, a second rotation angle, and a third rotation angle of the winding needle respectively; taking the first rotation angle as the target rotation angle, and taking the third rotation angle as the maximum rotation angle.

[0008] In some embodiments, during the process of the winding needle rotating from the starting angle to the first rotation angle, the winding needle is controlled to accelerate uniformly and the roller feeding mechanism is controlled to rotate synchronously; during the process of the winding needle rotating from the first rotation angle to the second rotation angle, the speed of the winding needle is kept constant and the roller feeding mechanism is controlled to rotate synchronously; during the process of the winding needle rotating from the second rotation angle to the third rotation angle, the winding needle is controlled to decelerate and the roller feeding mechanism is controlled to rotate synchronously.

[0009] In some embodiments, the plurality of moving distances include: a second moving distance from which the electrode sheet is moved by the roller feeding mechanism to a target number of turns when it is wound around the winding needle; and a third moving distance from which the electrode sheet is moved by the roller feeding mechanism to a point where the winding needle has completed pre-winding.

[0010] In some embodiments, converting the plurality of moving distances to obtain a plurality of rotation angles of the winding needle, and determining a target rotation angle and a maximum rotation angle from the plurality of rotation angles, includes: converting the second moving distance and the third moving distance respectively to obtain a second rotation angle and a third rotation angle of the winding needle respectively; taking the second rotation angle as the target rotation angle and the third rotation angle as the maximum rotation angle.

[0011] In some embodiments, during the process of the winding needle rotating from the initial angle to the second rotation angle, the winding needle is controlled to accelerate uniformly and the roller feeding mechanism is controlled to rotate synchronously; during the process of the winding needle rotating from the second rotation angle to the third rotation angle, the winding needle is controlled to decelerate and the roller feeding mechanism is controlled to rotate synchronously.

[0012] In some embodiments, the moving distance is converted to the rotation angle using the following formula: Rotation angle of the winding needle = Moving distance of the electrode * 180 / (Radius of the winding needle * π).

[0013] In some embodiments, controlling the synchronous rotation of the roller feeding mechanism includes: controlling the roller feeding mechanism to rotate synchronously according to a preset speed correspondence, wherein the preset speed correspondence characterizes the correspondence between the speed of the roller feeding mechanism and the speed of the winding needle.

[0014] Secondly, embodiments of this application also provide a controller, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the first-layer tab margin control method as described in the first aspect above when running the computer program.

[0015] Thirdly, embodiments of this application also provide a computer-readable storage medium storing computer-executable instructions for performing the first-layer tab margin control method as described in the first aspect above.

[0016] The technical solutions of this application embodiment include, but are not limited to, the following technical effects: First, this application embodiment obtains the moving distance of the electrode sheet from the roller feeding mechanism to multiple preset positions of the winding needle; then, this application embodiment converts the multiple moving distances to obtain multiple rotation angles of the winding needle, and determines the target rotation angle and the maximum rotation angle from the multiple rotation angles; next, this application embodiment controls the winding needle to move at a uniform acceleration and controls the roller feeding mechanism to rotate synchronously until the winding needle rotates from the initial angle to the target rotation angle; finally, during the process of the winding needle rotating from the target rotation angle to the maximum rotation angle, this application embodiment controls the winding needle to first move at a uniform speed and then decelerate or continuously decelerate, and controls the roller feeding mechanism to rotate synchronously. According to the technical solution of this application embodiment, firstly, a control method is adopted in which the roller feeding mechanism follows the movement of the winding needle. The winding needle acts as the main shaft, and the roller feeding mechanism as the driven shaft. Unlike control methods that follow encoders or virtual shafts on the market, the control method of this application embodiment can eliminate the influence of intermediate media, resulting in more consistent following, higher accuracy, and less susceptibility to other external factors. Secondly, this application embodiment divides the rotation process of the winding needle and the roller feeding mechanism into multiple stages and performs stable speed control on each stage. This makes the control of the winding needle and the roller feeding mechanism simpler and more accurate, ensuring that the electrode sheet does not arch when entering the winding needle, effectively preventing electrode sheet wrinkling and poor edge distance. Therefore, through the above control method, this application embodiment can improve the control accuracy of the edge distance of the first layer of electrode tabs in the battery cell to meet accuracy requirements.

[0017] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0018] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0019] Figure 1 This is a schematic diagram of a system architecture platform for performing a first-layer electrode margin control method according to an embodiment of this application;

[0020] Figure 2 This is a flowchart of a first-layer electrode edge distance control method provided in one embodiment of this application;

[0021] Figure 3 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application;

[0022] Figure 4 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application;

[0023] Figure 5 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application;

[0024] Figure 6 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application;

[0025] Figure 7 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application;

[0026] Figure 8 This is a schematic diagram illustrating the speed variation of the winding needle according to one embodiment of this application;

[0027] Figure 9 This is a schematic diagram of the speed variation of the winding needle provided in another embodiment of this application. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0029] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0030] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0032] In some cases, controlling the edge distance accuracy of the first-layer tab of a battery cell is a major pain point in the current winding machine industry of the new energy sector. If the edge distance accuracy of the first-layer tab does not meet the requirements during winding, the anode may not be able to completely cover the cathode, potentially causing a short circuit or explosion of the battery cell. Therefore, it is essential to ensure the required edge distance accuracy of the first-layer tab during winding. However, in actual winding, because there is a certain distance between the feed section and the winding needle, and they belong to different mechanisms, it is difficult to ensure that the movement of the two mechanisms remains consistent during winding, making it difficult to further improve the control accuracy of the edge distance of the first-layer tab.

[0033] Based on the above, this application provides a method for controlling the first-layer tab distance and a computer-readable storage medium, which can improve the control accuracy of the first-layer tab distance of the battery cell.

[0034] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, Figure 1 This is a schematic diagram of a system architecture platform for performing a first-layer electrode margin control method according to an embodiment of this application.

[0036] The system architecture platform 100 of this application embodiment includes one or more processors 110 and memory 120. Figure 1 The example uses a processor 110 and a memory 120.

[0037] Processor 110 and memory 120 can be connected via a bus or other means. Figure 1 Taking the example of a connection between China and Israel via a bus.

[0038] Memory 120, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 120 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 120 may optionally include memory 120 remotely located relative to processor 110, and these remote memories can be connected to the system architecture platform 100 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0039] Those skilled in the art will understand that Figure 1 The device structure shown does not constitute a limitation on the system architecture platform 100, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0040] exist Figure 1 In the system architecture platform 100 shown, the processor 110 can be used to call the first-layer tab margin control program stored in the memory 120, thereby realizing the first-layer tab margin control method.

[0041] Based on the hardware structure of the above system architecture platform, various embodiments of the first-layer electrode margin control method of this application are proposed.

[0042] like Figure 2 As shown, Figure 2 This is a flowchart of a first-layer electrode tab distance control method provided in one embodiment of this application. The first-layer electrode tab distance control method is applied to a winding device, which includes a winding needle and a roller feeding mechanism. The roller feeding mechanism is used to transport the electrode sheet to the winding needle for winding. The first-layer electrode tab distance control method includes, but is not limited to, steps S100, S200, S300 and S400.

[0043] Step S100: Obtain the moving distance of the electrode sheet from the roller feeding mechanism to multiple preset positions of the winding needle;

[0044] Step S200: Convert multiple moving distances to obtain multiple rotation angles of the winding needle, and determine the target rotation angle and the maximum rotation angle from the multiple rotation angles;

[0045] Step S300: Control the winding needle to accelerate uniformly and control the roller feeding mechanism to rotate synchronously until the winding needle rotates from the starting angle to the target rotation angle;

[0046] Step S400: During the process of the spinning needle rotating from the target rotation angle to the maximum rotation angle, control the spinning needle to first move at a constant speed and then decelerate or continuously decelerate, and control the roller feeding mechanism to rotate synchronously.

[0047] In one embodiment, during the pre-winding process, this embodiment first needs to obtain the movement distance of the electrode sheet from the roller feeding mechanism to multiple preset positions of the winding needle. These preset positions can be pre-set by a technician. Since the movement distance is a length distance, while the measurement position of the winding needle is an angle, this embodiment needs to convert and calculate the multiple movement distances one by one to obtain multiple rotation angles of the winding needle. Then, the target rotation angle and the maximum rotation angle are determined from the multiple rotation angles to facilitate subsequent staged speed control. Finally, for the stage where the winding needle rotates from the initial angle to the target rotation angle, this embodiment controls the winding needle to accelerate uniformly, while simultaneously controlling the roller feeding mechanism to rotate synchronously. For the stage where the winding needle rotates from the target rotation angle to the maximum rotation angle, this embodiment controls the winding needle to move at a uniform speed for a period of time before decelerating, while simultaneously controlling the roller feeding mechanism to rotate synchronously; alternatively, this embodiment controls the winding needle to continuously decelerate, while simultaneously controlling the roller feeding mechanism to rotate synchronously, thereby completing the pre-winding operation. After pre-winding is completed, the roller feeding mechanism stops moving, and the winding needle follows the virtual axis to enter normal winding at a synchronized speed.

[0048] According to the technical solution of this application embodiment, firstly, a control method is adopted in which the roller feeding mechanism follows the movement of the winding needle. The winding needle acts as the main shaft, and the roller feeding mechanism as the driven shaft. Unlike control methods that follow encoders or virtual shafts on the market, the control method of this application embodiment can eliminate the influence of intermediate media, resulting in more consistent following, higher accuracy, and less susceptibility to other external factors. Secondly, this application embodiment divides the rotation process of the winding needle and the roller feeding mechanism into multiple stages and performs stable speed control on each stage. This makes the control of the winding needle and the roller feeding mechanism simpler and more accurate, ensuring that the electrode sheet does not arch when entering the winding needle, effectively preventing electrode sheet wrinkling and poor edge distance. Therefore, through the above control method, this application embodiment can improve the control accuracy of the edge distance of the first layer of electrode tabs in the battery cell to meet accuracy requirements.

[0049] It should be noted that the method of controlling the uniform acceleration of the winding needle in step S300 when the winding needle rotates from the initial angle to the target rotation angle specifically refers to controlling the pre-winding speed of the winding needle to perform uniform acceleration at linear velocity, with the linear acceleration remaining constant, instead of using uniform acceleration at angular velocity. This is because the material roll becomes thicker with each turn during the winding process. If uniform acceleration at angular velocity were used at this time, the corresponding linear acceleration would gradually increase instead of remaining constant when converted to linear velocity. This makes the control of the winding needle and the roller feeding mechanism simpler and more accurate, ensuring that the electrode sheet does not arch when entering the winding needle, effectively preventing wrinkling and poor edge distance of the electrode sheet.

[0050] In addition, it should be noted that the speed control of the winding needle mentioned in step S400 is based on the linear speed. Furthermore, the deceleration process in step S400 can be carried out by uniform deceleration, which makes the control of the winding needle and the roller feeding mechanism simpler and more accurate. This ensures that the electrode sheet will not arch when it enters the winding needle, effectively preventing the electrode sheet from wrinkling and having poor edge distance.

[0051] It is worth noting that the maximum rotation angle mentioned above refers to the rotation angle with the largest value among multiple rotation angles; while the target rotation angle mentioned above refers to the rotation angle with a non-maximum value among multiple rotation angles.

[0052] Understandably, the conversion formula between the moving distance and the rotation angle can be as follows: Rotation angle of the winding needle = Moving distance of the electrode * 180 / (Radius of the winding needle * π), where π is the mathematical constant pi.

[0053] It is worth noting that the control of the needle winding and roller feeding mechanism in the embodiments of this application may include, but is not limited to, the following two control situations, wherein the first control situation may be as follows: Figures 3 to 4 As shown, the second control scenario can be as follows: Figures 5 to 6 As shown, they are as follows:

[0054] For the first control scenario: the multiple moving distances mentioned above include, but are not limited to: the first moving distance from which the electrode sheet is moved by the roller feeding mechanism to the winding needle, the second moving distance from which the electrode sheet is moved by the roller feeding mechanism to the winding needle to reach the target number of turns, and the third moving distance from which the electrode sheet is moved by the roller feeding mechanism to the winding needle to complete the pre-winding.

[0055] like Figure 3 As shown, Figure 3 This is a flowchart of a first-layer tab edge distance control method provided in another embodiment of this application. Regarding the conversion of multiple moving distances in step S200 above to obtain multiple rotation angles of the winding needle, and determining the target rotation angle and the maximum rotation angle from the multiple rotation angles, this includes, but is not limited to, steps S510 and S520.

[0056] Step S510: Convert the first moving distance, the second moving distance, and the third moving distance to obtain the first rotation angle, the second rotation angle, and the third rotation angle of the winding needle, respectively.

[0057] Step S520: Take the first rotation angle as the target rotation angle and the third rotation angle as the maximum rotation angle.

[0058] In one embodiment, when multiple moving distances include a first moving distance from the roller feeding mechanism to the winding needle, a second moving distance from the roller feeding mechanism to the winding needle to reach the target number of turns, and a third moving distance from the roller feeding mechanism to the winding needle to complete the pre-winding, the embodiments of this application will convert and calculate the first moving distance, the second moving distance, and the third moving distance respectively to obtain the first rotation angle, the second rotation angle, and the third rotation angle of the winding needle. Thus, the pre-winding process is divided into three stages: the first stage is the stage where the winding needle rotates from the initial angle to the first rotation angle, the second stage is the stage where the winding needle rotates from the first rotation angle to the second rotation angle, and the third stage is the stage where the winding needle rotates from the second rotation angle to the third rotation angle.

[0059] It is understood that the target number of turns mentioned above can be one and a half to two turns, or other numbers of turns. This application does not specifically limit the value of the target number of turns.

[0060] Additionally, it is understandable that the initial angle of the winding needle refers to the angle of the winding needle before pre-winding, which can be zero angle.

[0061] It should be noted that the conversion formulas for the first moving distance and the first rotation angle, the second moving distance and the second rotation angle, and the third moving distance and the third rotation angle can be as follows: Rotation angle of the winding needle = Moving distance of the electrode * 180 / (Radius of the winding needle * π), where π is the mathematical constant pi.

[0062] like Figure 4 As shown, Figure 4 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application. The steps S300 and S400 described above include, but are not limited to, steps S610, S620, and S630.

[0063] Step S610: During the process of the winding needle rotating from the starting angle to the first rotation angle, control the winding needle to accelerate uniformly and control the roller feeding mechanism to rotate synchronously.

[0064] Step S620: During the process of the winding needle rotating from the first rotation angle to the second rotation angle, keep the speed of the winding needle constant and control the roller feeding mechanism to rotate synchronously.

[0065] Step S630: During the process of the winding needle rotating from the second rotation angle to the third rotation angle, control the winding needle to decelerate and control the roller feeding mechanism to rotate synchronously.

[0066] In one embodiment, for the first stage of the pre-winding process, the present invention controls the winding needle to move at a uniform acceleration at a linear velocity and controls the roller feeding mechanism to rotate synchronously; for the second stage of the pre-winding process, the present invention controls the winding needle to move at a uniform speed at a linear velocity and controls the roller feeding mechanism to rotate synchronously; for the third stage of the pre-winding process, the present invention controls the winding needle to move at a deceleration at a linear velocity and controls the roller feeding mechanism to rotate synchronously, wherein, specifically, it can be a uniform deceleration motion.

[0067] It is worth noting that, since the initial linear velocity of the winding needle is zero in the first stage of pre-winding, it needs to be accelerated. In this embodiment, the winding needle is controlled to accelerate uniformly at a linear velocity in the first stage, ensuring that the electrode sheet does not arch when entering the winding needle, effectively preventing wrinkling and poor edge spacing. Furthermore, since the speed of the winding needle needs to be reduced to zero at the end of the third stage, this application requires deceleration of the winding needle after completing the first stage. This is divided into two stages: the second stage maintains uniform speed, and only in the third stage is the winding needle controlled to decelerate.

[0068] For the second control scenario: the multiple moving distances mentioned above include, but are not limited to: the second moving distance from which the electrode sheet moves from the roller feeding mechanism to the winding needle to reach the target number of turns, and the third moving distance from which the electrode sheet moves from the roller feeding mechanism to the winding needle to complete the pre-winding.

[0069] like Figure 5 As shown, Figure 5 This is a flowchart of a first-layer tab edge distance control method provided in another embodiment of this application. Regarding the conversion of multiple moving distances in step S200 above to obtain multiple rotation angles of the winding needle, and determining the target rotation angle and the maximum rotation angle from the multiple rotation angles, this includes, but is not limited to, steps S710 and S720.

[0070] Step S710: Convert the second moving distance and the third moving distance to obtain the second rotation angle and the third rotation angle of the winding needle respectively;

[0071] Step S720: Take the second rotation angle as the target rotation angle and the third rotation angle as the maximum rotation angle.

[0072] In one embodiment, when multiple moving distances include a second moving distance from the roller feeding mechanism to the winding needle to reach the target number of turns, and a third moving distance from the roller feeding mechanism to the winding needle to complete the pre-winding, the embodiments of this application will convert and calculate the second moving distance and the third moving distance respectively to obtain the second rotation angle and the third rotation angle of the winding needle, thereby dividing the pre-winding process into two stages: the first stage is the stage where the winding needle rotates from the initial angle to the second rotation angle, and the second stage is the stage where the winding needle rotates from the second rotation angle to the third rotation angle.

[0073] It is understood that the target number of turns mentioned above can be one and a half to two turns, or other numbers of turns. This application does not specifically limit the value of the target number of turns.

[0074] Additionally, it is understandable that the initial angle of the winding needle refers to the angle of the winding needle before pre-winding, which can be zero angle.

[0075] It should be noted that the conversion formulas for the second moving distance and the second rotation angle, the third moving distance and the third rotation angle are as follows: Rotation angle of the winding needle = Moving distance of the electrode * 180 / (Radius of the winding needle * π), where π is the mathematical constant pi.

[0076] like Figure 6 As shown, Figure 6 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application. The steps S300 and S400 described above include, but are not limited to, steps S810 and S820.

[0077] Step S810: During the process of the winding needle rotating from the initial angle to the second rotation angle, control the winding needle to accelerate uniformly and control the roller feeding mechanism to rotate synchronously.

[0078] Step S820: During the process of the winding needle rotating from the second rotation angle to the third rotation angle, control the winding needle to decelerate and control the roller feeding mechanism to rotate synchronously.

[0079] In one embodiment, for the first stage of the pre-winding process, the present invention controls the winding needle to move at a linear velocity with uniform acceleration and controls the roller feeding mechanism to rotate synchronously; for the second stage of the pre-winding process, the present invention controls the winding needle to move at a linear velocity with deceleration and controls the roller feeding mechanism to rotate synchronously, wherein, specifically, it can be a uniform deceleration motion.

[0080] It is worth noting that, since the initial linear velocity of the winding needle is zero in the first stage of pre-winding, it needs to be accelerated. In this embodiment, the winding needle is controlled to accelerate uniformly at a linear velocity in the first stage, ensuring that the electrode sheet does not arch when entering the winding needle, effectively preventing wrinkling and poor edge spacing. Furthermore, since the speed of the winding needle needs to be reduced to zero at the end of the second stage, this embodiment requires controlling the winding needle to decelerate during the second stage after completing the first stage.

[0081] In addition, such as Figure 7 As shown, Figure 7 This is a flowchart of a first-layer electrode edge distance control method provided in another embodiment of this application. The method of controlling the synchronous rotation of the control roller feeding mechanism in the above steps S300, S400, S610 to S630, and S810 to S820 includes, but is not limited to, step S900.

[0082] Step S900: Control the roller feeding mechanism to rotate synchronously according to the preset speed correspondence, wherein the preset speed correspondence represents the correspondence between the speed of the roller feeding mechanism and the speed of the winding needle.

[0083] In one embodiment, for the linkage control method between the needle winding and the roller feeding mechanism, the roller feeding mechanism rotates synchronously according to the correspondence between the speed of the roller feeding mechanism and the speed of the needle winding. The needle winding acts as the main shaft and the roller feeding mechanism acts as the slave shaft. Unlike the control methods of following encoders or virtual shafts on the market, the control method of this application embodiment can eliminate the influence of intermediate media, thereby making the following more consistent, more accurate, and less affected by other external factors.

[0084] Based on the first-layer tab margin control method of the above embodiments, the overall embodiments of the first-layer tab margin control method of this application are presented below.

[0085] The overall embodiment of the pre-rolling process logic control in this application includes, but is not limited to, the following steps:

[0086] Step 1: The cam needs to take three coordinate points, which correspond to the point where the electrode is fed from the roller feeding mechanism to the point where it enters the winding needle, the point where it wraps one and a half to two turns, and the point where the pre-winding is completed. The winding needle is the main shaft, the roller feeding mechanism is the driven shaft, and the speed relationship between the winding needle and the roller feeding mechanism meets the preset speed correspondence.

[0087] Step 2: Since the winding needle is angular velocity, the coordinate point needs to be converted into the coordinate point of the winding needle position according to the arc length formula, as follows: Winding needle position coordinate point (angle) = coordinate position (distance) * 180 / (winding needle radius R * 3.1415926). The three points of the cam are obtained through the above formula.

[0088] Step 3: When the winding needle moves, the roller feeding mechanism moves according to the planned positional relationship, clamps the electrode sheet and rolls it into the winding needle.

[0089] Step 4: After completing the entire coordinate point operation, stop the pre-winding and switch the winding needle to normal winding control that follows the virtual axis.

[0090] The core logic of the pre-winding in this application includes: using the position of the winding needle as the main axis and the roller feeding mechanism as the slave axis, the motion is controlled by cam coupling; the pre-winding speed of the winding needle is fixed at a linear velocity of 1000 mm / s, and the acceleration during pre-winding is fixed at 300 mm / s², and the pre-winding process is carried out in a uniform acceleration process; the motor response is tuned to ensure that the response error of each winding needle motor and roller feeding mechanism is within 5 ms.

[0091] For the overall embodiments of this application, there are, but are not limited to, the following two control schemes, which are as follows:

[0092] like Figure 8 As shown, Figure 8 This is a schematic diagram of the speed change of the winding needle according to an embodiment of this application. The specific control method includes: setting three coordinate points, which correspond to the coordinate points of the electrode sheet from the roller feeding mechanism to the winding needle, the coordinate points of wrapping one and a half to two turns, and the coordinate points of pre-winding completion; then, between the zero point and the first coordinate point, controlling the winding needle to accelerate uniformly; between the first coordinate point and the second coordinate point, controlling the winding needle to move at a uniform speed; between the second coordinate point and the third coordinate point, controlling the winding needle to decelerate until the pre-winding is completed; and, for the above three stages, it is necessary to control the roller feeding mechanism and the winding needle to rotate synchronously.

[0093] like Figure 9 As shown, Figure 9 This is a schematic diagram of the speed change of the winding needle provided in another embodiment of this application. The specific control method includes: setting two coordinate points, which correspond to the point of wrapping one and a half to two turns and the point of pre-winding completion, respectively; then, between the zero point and the first coordinate point, controlling the winding needle to accelerate uniformly, with the acceleration during pre-winding fixed at 300 mm / s2, accelerating to a linear speed of 1000 mm / s; between the first coordinate point and the second coordinate point, slowly decelerating until the pre-winding is completed; and, for both of the above stages, it is necessary to control the roller feeding mechanism and the winding needle to rotate synchronously.

[0094] Based on the first-layer tab margin control method of the above embodiments, the following presents various embodiments of the controller and computer-readable storage medium of this application.

[0095] Additionally, one embodiment of this application provides a controller comprising: a processor, a memory, and a computer program stored in the memory and executable on the processor.

[0096] The processor and memory can be connected via a bus or other means.

[0097] It should be noted that the controller in this embodiment may include, for example: Figure 1 The processor and memory in the illustrated embodiment belong to the same patent concept, and therefore have the same implementation principle and beneficial effects, which will not be described in detail here.

[0098] The non-transient software program and instructions required to implement the first-layer tab margin control method of the above embodiments are stored in memory. When executed by the processor, the first-layer tab margin control method of the above embodiments is executed.

[0099] According to the technical solution of this application embodiment, firstly, a control method is adopted in which the roller feeding mechanism follows the movement of the winding needle. The winding needle acts as the main shaft, and the roller feeding mechanism as the driven shaft. Unlike control methods that follow encoders or virtual shafts on the market, the control method of this application embodiment can eliminate the influence of intermediate media, resulting in more consistent following, higher accuracy, and less susceptibility to other external factors. Secondly, this application embodiment divides the rotation process of the winding needle and the roller feeding mechanism into multiple stages and performs stable speed control on each stage. This makes the control of the winding needle and the roller feeding mechanism simpler and more accurate, ensuring that the electrode sheet does not arch when entering the winding needle, effectively preventing electrode sheet wrinkling and poor edge distance. Therefore, through the above control method, this application embodiment can improve the control accuracy of the edge distance of the first layer of electrode tabs in the battery cell to meet accuracy requirements.

[0100] It is worth noting that, since the controller of this application embodiment is capable of executing the first-layer tab margin control method of the above embodiments, the specific implementation method and technical effects of the controller of this application embodiment can refer to the specific implementation method and technical effects of the first-layer tab margin control method of any of the above embodiments.

[0101] Furthermore, one embodiment of this application provides a computer-readable storage medium storing computer-executable instructions for performing the aforementioned first-layer tab margin control method. Exemplarily, the above-described method is executed... Figures 2 to 7 The methods and steps in the text.

[0102] According to the technical solution of this application embodiment, firstly, a control method is adopted in which the roller feeding mechanism follows the movement of the winding needle. The winding needle acts as the main shaft, and the roller feeding mechanism as the driven shaft. Unlike control methods that follow encoders or virtual shafts on the market, the control method of this application embodiment can eliminate the influence of intermediate media, resulting in more consistent following, higher accuracy, and less susceptibility to other external factors. Secondly, this application embodiment divides the rotation process of the winding needle and the roller feeding mechanism into multiple stages and performs stable speed control on each stage. This makes the control of the winding needle and the roller feeding mechanism simpler and more accurate, ensuring that the electrode sheet does not arch when entering the winding needle, effectively preventing electrode sheet wrinkling and poor edge distance. Therefore, through the above control method, this application embodiment can improve the control accuracy of the edge distance of the first layer of electrode tabs in the battery cell to meet accuracy requirements.

[0103] It is worth noting that, since the computer-readable storage medium of this application embodiment can implement the first-layer tab margin control method of the above embodiments, the specific implementation method and technical effects of the computer-readable storage medium of this application embodiment can refer to the specific implementation method and technical effects of the first-layer tab margin control method of any of the above embodiments.

[0104] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0105] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for controlling the edge distance of the first-layer electrode ear, characterized in that, The method is applied to a winding apparatus, which includes a winding needle and a roller feeding mechanism. The roller feeding mechanism is used to transport the electrode sheet to the winding needle for winding. The winding needle is the main shaft, and the roller feeding mechanism is the driven shaft. The method includes: The movement distance of the electrode sheet from the roller feeding mechanism to multiple preset positions of the winding needle is obtained. The preset positions include at least two of the following: the position where the electrode sheet reaches the winding needle, the position where the electrode sheet is wound around the winding needle to reach the target number of turns, and the position where the winding needle is pre-wound. Multiple moving distances are converted to obtain multiple rotation angles of the winding needle, and a target rotation angle and a maximum rotation angle are determined from the multiple rotation angles. The rotation angle with the largest value is taken as the maximum rotation angle, and the rotation angle with a non-maximum value is taken as the target rotation angle. The winding needle is controlled to accelerate uniformly and the roller feeding mechanism is controlled to rotate synchronously until the winding needle rotates from the initial angle to the target rotation angle. During the process of the winding needle rotating from the target rotation angle to the maximum rotation angle, the winding needle is controlled to first move at a constant speed and then decelerate or continuously decelerate. When there is an intermediate rotation angle between the target rotation angle and the maximum rotation angle, the winding needle is controlled to first move at a constant speed and then decelerate. When there is no intermediate rotation angle, the winding needle is controlled to continuously decelerate, and the roller feeding mechanism is controlled to rotate synchronously.

2. The method for controlling the edge distance of the first-layer electrode ear according to claim 1, characterized in that, The plurality of said moving distances include: a first moving distance by which the electrode sheet is moved by the roller feeding mechanism to the winding needle; a second moving distance by which the electrode sheet is moved by the roller feeding mechanism to wind the winding needle to reach the target number of turns; and a third moving distance by which the electrode sheet is moved by the roller feeding mechanism to the winding needle to complete the pre-winding.

3. The method for controlling the edge distance of the first-layer electrode ear according to claim 2, characterized in that, The process of converting multiple moving distances to obtain multiple rotation angles of the winding needle, and determining the target rotation angle and the maximum rotation angle from the multiple rotation angles, includes: The first moving distance, the second moving distance, and the third moving distance are converted respectively to obtain the first rotation angle, the second rotation angle, and the third rotation angle of the winding needle; The first rotation angle is taken as the target rotation angle, and the third rotation angle is taken as the maximum rotation angle.

4. The first-layer electrode edge distance control method according to claim 3, characterized in that: During the process of the winding needle rotating from the starting angle to the first rotation angle, the winding needle is controlled to move at a uniform acceleration and the roller feeding mechanism is controlled to rotate synchronously. During the process of the winding needle rotating from the first rotation angle to the second rotation angle, the speed of the winding needle is kept constant and the roller feeding mechanism is controlled to rotate synchronously; During the process of the winding needle rotating from the second rotation angle to the third rotation angle, the winding needle is controlled to decelerate and the roller feeding mechanism is controlled to rotate synchronously.

5. The method for controlling the edge distance of the first-layer electrode ear according to claim 1, characterized in that, The plurality of said moving distances include: a second moving distance from which the electrode sheet is moved by the roller feeding mechanism to reach a target number of turns when it is wound around the winding needle; and a third moving distance from which the electrode sheet is moved by the roller feeding mechanism to the point where the winding needle has completed pre-winding.

6. The method for controlling the edge distance of the first-layer electrode ear according to claim 5, characterized in that, The process of converting multiple moving distances to obtain multiple rotation angles of the winding needle, and determining the target rotation angle and the maximum rotation angle from the multiple rotation angles, includes: The second moving distance and the third moving distance are converted respectively to obtain the second rotation angle and the third rotation angle of the winding needle; The second rotation angle is taken as the target rotation angle, and the third rotation angle is taken as the maximum rotation angle.

7. The method for controlling the edge distance of the first-layer electrode ear according to claim 6, characterized in that: During the process of the winding needle rotating from the initial angle to the second rotation angle, the winding needle is controlled to accelerate uniformly and the roller feeding mechanism is controlled to rotate synchronously. During the process of the winding needle rotating from the second rotation angle to the third rotation angle, the winding needle is controlled to decelerate and the roller feeding mechanism is controlled to rotate synchronously.

8. The method for controlling the edge distance of the first-layer electrode ear according to any one of claims 1 to 7, characterized in that, The moving distance is converted to the rotation angle using the following formula: The rotation angle of the winding needle = the distance the electrode moves * 180 / (the radius of the winding needle * π).

9. The method for controlling the edge distance of the first-layer electrode ear according to any one of claims 1 to 7, characterized in that, The method of controlling the synchronous rotation of the roller conveying mechanism includes: The roller feeding mechanism is controlled to rotate synchronously according to a preset speed correspondence, wherein the preset speed correspondence represents the correspondence between the speed of the roller feeding mechanism and the speed of the winding needle.

10. A computer-readable storage medium, characterized in that, The device stores computer-executable instructions for performing the first-layer electrode edge distance control method as described in any one of claims 1 to 9.

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