Unwinding control method, device, controller and storage medium during station change process

Abstract

The present application provides a method, device, controller and storage medium for unwinding in a station-changing process, which belongs to the field of battery technology. The unwinding control method for the station-changing process includes: obtaining the turret rotation angle, turret radius and initial center distance from the film roller to the cell at the current station of the battery cell, wherein the turret rotation angle at the initial station of the battery cell is zero; based on the turret rotation angle, turret radius and initial center distance from the film roller to the winding needle, a material line length calculation model is established, wherein the material line length is the total length of the material line from the film roller to the cell during the station-changing process and the material line wound onto the cell; based on the material line length calculation model, the current station of the cell and the target station of the cell, the change in the material line length is determined; based on the change in the material line length and the moving time of the cell, the unwinding speed of the material strip is determined; and the unwinding drive module is controlled according to the unwinding speed to unwind the material strip.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method, device, controller and storage medium for controlling unwinding in a station change process. Background Art

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

[0003] Regarding battery production technology, the actual errors generated during the production process have a greater impact on battery safety, especially during the station change process. Therefore, a method for unwinding control during the station change process is urgently needed. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one object of the present application is to provide a method, device, controller and storage medium for unwinding control during a station change process to improve the quality rate of battery cell production.

[0005] An embodiment of the first aspect of the present application provides a method for controlling unwinding in a workstation change process, the method comprising: obtaining a turret rotation angle, a turret radius and an initial center distance from a film roller to a cell at a current workstation of a battery cell, wherein the turret rotation angle at the initial workstation of the battery cell is zero; establishing a material line length calculation model based on the turret rotation angle, the turret radius and the initial center distance from the film roller to a winding needle, wherein the material line length is the total length of the material line from the film roller to the cell and the material line wound onto the cell during the workstation change process; determining a change in the material line length based on the material line length calculation model, the current workstation of the battery cell and the target workstation of the battery cell; determining an unwinding speed of the material tape based on the change in the material line length and the movement time of the battery cell; and controlling an unwinding drive module to unwind the material tape according to the unwinding speed.

[0006] In the technical solution of the embodiment of the present application, a material line length calculation model is established to determine the change in the material line length, thereby determining the unwinding speed of the material tape, so as to control the unwinding drive module to unwind the material tape, so that the unwinding drive module can ensure the synchronization of the unwinding and winding speeds, improve the unwinding speed and the material line tension stability, reduce the tension fluctuation when changing work stations, and also reduce the alarm of problems such as material line correction over-limit caused by abnormal tension during the work station change process. At the same time, it is not affected by changes in material parameters and changes in battery cell types, thereby improving the degree of automation of battery cell winding, saving winding manpower, and improving the quality rate of battery cell production.

[0007] In some embodiments, based on the turret rotation angle, turret radius and the initial center distance from the film-joining roller to the winding needle, establishing a material line length calculation model includes: determining the material line tangent length, material line arc length and material line winding length based on the turret rotation angle, turret radius and the initial center distance from the film-joining roller to the winding needle; and establishing a material line length calculation model based on the material line tangent length, material line arc length and material line winding length. By dividing the material line length into the material line tangent length, material line arc length and material line winding length, and establishing a material line length calculation model based on the material line tangent length, material line arc length and material line winding length, the material line length calculation process is simplified and the material line length calculation efficiency is improved.

[0008] In some embodiments, based on the turret rotation angle, turret radius and initial center distance between the film-joining roller and the winding needle, determining the material line tangent length includes: determining the center distance between the film-joining roller and the battery cell based on the turret rotation angle, turret radius and initial center distance between the film-joining roller and the winding needle; determining the material line tangent length based on the center distance between the film-joining roller and the battery cell and the radius of the battery cell. Determining the material line tangent length by the center distance between the film-joining roller and the battery cell and the radius of the battery cell improves the accuracy and reliability of the material line tangent length.

[0009] In some embodiments, determining the arc length of the material line based on the turret rotation angle, turret radius, and the initial center distance from the film roller to the winding needle includes: determining the arc angle of the material line based on the turret rotation angle, turret radius, and the initial center distance from the film roller to the winding needle; determining the radius of the battery cell; and determining the arc length of the material line based on the radius of the battery cell and the arc angle of the material line. The arc angle of the material line is determined according to the turret rotation angle, turret radius, and the initial center distance from the film roller to the winding needle, and the arc length of the material line is determined according to the arc angle of the material line and the radius of the battery cell, and the obtained arc length of the material line has a higher accuracy.

[0010] In some embodiments, determining the arc angle of the material line based on the turret rotation angle, the turret radius, and the initial center distance between the film-joining roller and the winding needle includes: determining the center distance between the film-joining roller and the winding needle based on the turret rotation angle, the turret radius, and the initial center distance between the film-joining roller and the winding needle; determining the arc angle of the material line based on the center distance between the film-joining roller and the winding needle. Determining the arc angle of the material line based on the center distance between the film-joining roller and the winding needle simplifies the calculation process of the arc angle of the material line.

[0011] In some embodiments, based on the turret rotation angle, turret radius, and the initial center distance from the film roller to the winding needle, determining the winding length of the wire includes: obtaining the winding angle of the battery cell; determining the radius of the battery cell; and determining the winding length of the wire based on the winding angle and the radius of the battery cell. Determining the winding length of the wire based on the winding angle and the radius of the battery cell can make the calculation process of the winding length of the wire simpler, thereby improving the calculation efficiency of the winding length of the wire.

[0012] In some embodiments, the method further includes: the battery cell moves along a preset track. During the process of changing the workstation, the battery cell moves along the preset track, thereby improving the safety and reliability of the unwinding control during the process of changing the workstation.

[0013] An embodiment of the second aspect of the present application provides an unwinding control device for a workstation change process, including: an acquisition module, configured to acquire the turret rotation angle, turret radius and initial center distance from the film roller to the battery cell of the current workstation of the battery cell, wherein the turret rotation angle of the initial workstation of the battery cell is zero; a model establishment module, configured to establish a material line length calculation model based on the turret rotation angle, turret radius and initial center distance from the film roller to the winding needle, wherein the total length of the material line from the film roller to the battery cell and the material line wound onto the battery cell during the workstation change process; a change determination module, configured to determine the change in the material line length based on the material line length calculation model, the current workstation of the battery cell and the target workstation of the battery cell; an unwinding speed determination module, configured to determine the unwinding speed of the material tape based on the change in the length of the material tape and the movement time of the battery cell; and an unwinding module, configured to control the unwinding drive module to unwind the material tape according to the unwinding speed.

[0014] In some embodiments, the model building module includes: a length determination unit, configured to determine the material line tangent length, material line arc length and material line winding length based on the turret rotation angle, turret radius and initial center distance from the film roller to the winding needle; a model building unit, configured to establish a material line length calculation model based on the material line tangent length, material line arc length and material line winding length.

[0015] In some embodiments, the length determination unit includes: a center distance determination unit, configured to determine the center distance from the film roller to the battery cell based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; a tangent length determination unit, configured to determine the tangent length of the material line based on the center distance from the film roller to the battery cell and the turret radius.

[0016] In some embodiments, the length determination unit includes: an arc angle determination unit, configured to determine the arc angle of the material line based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; a radius determination unit, configured to determine the radius of the battery cell; and an arc length determination unit, configured to determine the arc length of the material line based on the radius of the battery cell and the arc angle of the material line.

[0017] In some embodiments, the arc angle determination unit includes: a center distance determination unit, configured to determine the center distance from the film roller to the winding needle based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; an arc angle determination subunit, configured to determine the arc angle of the material line based on the center distance from the film roller to the winding needle.

[0018] In some embodiments, the length determination unit includes: an angle acquisition unit configured to acquire the winding angle of the battery cell; a radius determination unit configured to determine the radius of the battery cell; and a winding length determination unit configured to determine the winding length of the material wire based on the winding angle and the radius of the battery cell.

[0019] An embodiment of the third aspect of the present application provides a controller, including a memory and a processor, the memory being used to store computer-executable instructions; the processor being used to access the memory and execute computer-executable instructions to perform the operations in the unwinding control method of the workstation change process of any one of the aforementioned embodiments.

[0020] An embodiment of the fourth aspect of the present application provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, any of the above methods is implemented.

[0021] An embodiment of the fifth aspect of the present application provides a computer program product, including a computer-readable code, or a non-volatile computer-readable storage medium carrying the computer-readable code. When the computer-readable code runs in an electronic device, a processor in the electronic device executes any one of the above methods.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0024] Figure 1 The process of the unwinding control method in the station change process of some embodiments of the present application Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the state of a battery cell when winding is completed in some embodiments of the present application;

[0026] Figure 3 A schematic diagram of a station change process in some embodiments of the present application;

[0027] Figure 4 The process of the unwinding control method in the station change process of some embodiments of the present application Figure 2 ;

[0028] Figure 5 A block diagram of an unwinding control device for a station change process in some embodiments of the present application;

[0029] Figure 6 The process of the unwinding control method in the station change process of some embodiments of the present application Figure 3 .

[0030] Description of reference numerals:

[0031] 200, film roller; 300, battery cell; 400, turret center. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0041] Winding is a key process in the production of bare cells. During the process, the speed, tension, alignment and other product parameters of the material line need to be strictly controlled to ensure product quality. In particular, each time a bare cell is wound, the workstation needs to be switched. Since the movement of the material line is nonlinear, the material line is prone to jitter due to inconsistent rewinding and unwinding, resulting in large fluctuations in product tension and abnormal correction.

[0042] Based on this, an embodiment of the present application discloses an unwinding control method for a workstation change process, the method comprising: obtaining the turret rotation angle, turret radius and initial center distance from the film roller to the battery cell of the current workstation of the battery cell, wherein the turret rotation angle of the initial workstation of the battery cell is zero; establishing a material line length calculation model based on the turret rotation angle, turret radius and initial center distance from the film roller to the winding needle, wherein the material line length is the total length of the material line from the film roller to the battery cell and the material line wound onto the battery cell during the workstation change process; determining a change in the material line length based on the material line length calculation model, the current workstation of the battery cell and the target workstation of the battery cell; determining the unwinding speed of the material tape based on the change in the material line length and the movement time of the battery cell; and controlling the unwinding drive module to unwind the material tape according to the unwinding speed.

[0043] In the technical solution of the embodiment of the present application, a material line length calculation model is established to determine the change in the material line length, thereby determining the unwinding speed of the material tape, so as to control the unwinding drive module to unwind the material tape, so that the unwinding drive module can ensure the synchronization of the unwinding and winding speeds, improve the unwinding speed and the material line tension stability, reduce the tension fluctuation when changing work stations, and also reduce the alarm of problems such as material line correction over-limit caused by abnormal tension during the work station change process. At the same time, it is not affected by changes in material parameters and changes in battery cell types, thereby improving the degree of automation of battery cell winding, saving winding manpower, and improving the quality rate of battery cell production.

[0044] The unwinding control method for the station change process disclosed in the embodiment of the present application can be applied not only to winding machines but also to other equipment.

[0045] According to some embodiments of the present application, a method for controlling unwinding in a station change process is provided. Figure 1 The process of the unwinding control method in the station change process of some embodiments of the present application Figure 1 See also Figure 1 , the method comprising:

[0046] Step S110, obtaining the turret rotation angle, turret radius and initial center distance between the film roller and the battery cell at the current station of the battery cell, wherein the turret rotation angle at the initial station of the battery cell is zero;

[0047] Step S120, based on the turret rotation angle, turret radius and the initial center distance from the film roller to the winding needle, a material line length calculation model is established, wherein the material line length is the total length of the material line from the film roller to the battery cell during the process of changing the workstation and the material line wound onto the battery cell;

[0048] Step S130, determining a change in the length of the material line based on the material line length calculation model, the current position of the battery cell, and the target position of the battery cell;

[0049] Step S140, determining the unwinding speed of the tape based on the change in the length of the tape and the moving time of the battery cell; and

[0050] Step S150, controlling the unwinding driving module to unwind the material tape according to the unwinding speed.

[0051] In the process of preparing the battery cell, after the battery cell is wound, it is necessary to withdraw the battery cell from the winding station and allow another idle winding needle to enter the winding station to prepare for the winding of the next battery cell. Therefore, the wound battery cell is changed to another station by rotating the turret motor until the idle winding needle reaches the winding station and stops. When the winding machine changes stations on the turntable, the unwinding speed of the material tape needs to be synchronously controlled. When the unwinding speed of the material tape is too high or too low, the stability of the unwinding tension of the material tape will deteriorate, which may easily cause battery quality problems such as material tape misalignment, and reduce the yield rate of battery cell production.

[0052] The unwinding control method in the station change process of the embodiment of the present application is applied to the controller in the winding machine.

[0053] Step S110, obtaining the turret rotation angle, turret radius and initial center distance between the film roller and the battery cell at the current station of the battery cell, wherein the turret rotation angle at the initial station of the battery cell is zero.

[0054] Figure 2 This is a schematic diagram of the state of the battery cell of some embodiments of the present application when winding is completed, see Figure 2 , the film-joining roller 200 is a fixed roller, which mainly plays the role of backing the material belt, F represents the initial center distance from the film-joining roller to the battery cell 300; r represents the radius of the battery cell 300. At this time, the battery cell 300 is located at the initial position, and the rotation angle of the turret at the initial position of the battery cell is zero.

[0055] Figure 3 This is a schematic diagram of the station change process of some embodiments of the present application, see Figure 3 , R represents the radius of the turret. During the process of changing positions, the turret rotates, and the battery cell 300 moves in a circle with a radius of R and the center of the turret. When the turret rotates a certain angle (and the battery cell may rotate on its own), the total length of the material line from the film roller to the battery cell 300 and the material line wound onto the battery cell, that is, the length of the material line, changes significantly. During the process of changing positions, the turret center 400, the initial center distance F from the film roller 200 to the battery cell 300, and the turret radius R remain unchanged.

[0056] Step S120, based on the turret rotation angle, turret radius and initial center distance from the film roller to the winding needle, establish a material line length calculation model, wherein the material line length is the total length of the material line from the film roller to the battery cell during the station change process and the material line wound onto the battery cell.

[0057] In the embodiment of the present application, the length of the material line is the total length of the material line from the film roller to the cell during the cell change process and the material line wound on the cell. The length of the material line is related to the turret rotation angle, turret radius and the initial center distance from the film roller to the winding needle. Figure 3 The length of the material line can include the tangent length of the material line , Material line arc length Reeling length of material line , where the material line tangent length is the length of the tangent between the film roller and the battery cell, and the material line wound around the periphery of the battery cell includes the material line arc length Reeling length of material line During the process of changing the workstation, the battery cell will also rotate. The length of the wound tape during the rotation is the length of the material line winding. In the process of establishing the material line length calculation model, the material line tangent length, material line arc length and material line winding length can be determined based on the turret rotation angle, turret radius and the initial center distance from the film roller to the winding needle; and the material line length calculation model is established based on the material line tangent length, material line arc length and material line winding length.

[0058] In some embodiments, the established material line length calculation model may be:

[0059]

[0060] in, Indicates the length of the material line. Indicates the tangent length of the material line. Indicates the arc length of the material line. Indicates the winding length of the material line.

[0061] Step S130, determining the change in the length of the material line based on the material line length calculation model, the current position of the battery cell, and the target position of the battery cell.

[0062] In the embodiment of the present application, the turret rotation angle can be determined according to the current station of the battery cell to determine the material line length of the current station, and the turret rotation angle can be determined according to the target station of the battery cell to determine the material line length of the target station. The material line length of the target station is subtracted from the material line length of the current station to obtain the change in the material line length.

[0063] In other words, according to the solution of the embodiment of the present application, the change in the length of the material line can be determined based on the material line length calculation model, the current position of the battery cell and the target position of the battery cell.

[0064] Step S140, determining the unwinding speed of the material tape based on the change in the length of the material tape and the movement time of the battery cell.

[0065] Exemplarily, the unwinding speed of the tape may be:

[0066]

[0067] in, Indicates the change in the length of the material line. Indicates the movement time of the battery cell. Indicates the unwinding speed of the material tape.

[0068] Step S150, controlling the unwinding driving module to unwind the material tape according to the unwinding speed.

[0069] Controlling the unwinding drive module to unwind the material strip according to the unwinding speed can improve the stability of the synchronous speed control of the material strip unwinding, thereby avoiding the probability of unstable problems such as diaphragm misalignment caused by abnormal unwinding correction due to large fluctuations in diaphragm tension during workstation change, and occasional alarms due to the diaphragm unwinding tension buffer occasionally reaching the limit value.

[0070] In an embodiment of the present application, a material line length calculation model is established to determine the change in the material line length, thereby determining the unwinding speed of the material tape, so as to control the unwinding drive module to unwind the material tape, so that the unwinding drive module can ensure the synchronization of the unwinding and winding speeds, improve the unwinding speed and the material line tension stability, reduce the tension fluctuation when changing work stations, and also reduce the alarm of problems such as material line deviation correction exceeding the limit caused by abnormal tension during the work station change process. At the same time, it is not affected by changes in material parameters and changes in battery cell types, thereby improving the degree of automation of battery cell winding, saving winding manpower, and improving the quality rate of battery cell production.

[0071] According to some embodiments of the present application, Figure 4 The process of the unwinding control method in the station change process of some embodiments of the present application Figure 2 , the aforementioned step S120 includes:

[0072] Step S121, determining the material line tangent length, material line arc length and material line winding length based on the turret rotation angle, turret radius and the initial center distance from the film roller to the winding needle;

[0073] Step S122, establishing a material line length calculation model according to the material line tangent length, the material line arc length and the material line winding length.

[0074] In the examples of this application, see Figure 3 The length of the material line can include the tangent length of the material line , Material line arc length Reeling length of material line , where the material line tangent length is the length of the tangent between the film roller and the battery cell, and the material line wound around the periphery of the battery cell includes the material line arc length Reeling length of material line During the process of changing the workstation, the battery cell will also rotate. The length of the wound tape during the rotation is the length of the material line winding. .

[0075] In some embodiments, the tangent length of the material line is determined based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle. Can be:

[0076]

[0077]

[0078] in, represents the turret radius, Indicates the turret rotation angle, Indicates the distance from the film roller to the initial center of the cell. Indicates the tangent length of the material line. Indicates the center distance from the film roller to the cell. Indicates the radius of the battery cell.

[0079] Length of material line arc Can be:

[0080]

[0081]

[0082] Can be:

[0083] in, Indicates the arc angle of the material line. Indicates the angle between the center of the film roller, the center of the cell and the center of the turret. It represents the angle between the line from the film roller to the center of the winding needle and the radius of the battery cell. Indicates the arc length of the material line. represents the radius of the battery cell, Indicates the arc angle of the material line.

[0084] Material line reel length Can be:

[0085]

[0086] in, Indicates the winding length of the material line. represents the radius of the battery cell, Indicates the winding angle of the battery cell.

[0087] The established material line length calculation model can be:

[0088]

[0089] in, Indicates the length of the material line. Indicates the tangent length of the material line. Indicates the arc length of the material line. Indicates the winding length of the material line.

[0090] In an embodiment of the present application, by dividing the material line length into the material line tangent length, the material line arc length and the material line winding length, and establishing a material line length calculation model based on the material line tangent length, the material line arc length and the material line winding length, the calculation process of the material line length is simplified and the calculation efficiency of the material line length is improved.

[0091] According to some embodiments of the present application, the aforementioned step S121 includes: determining the center distance from the film roller to the battery cell based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; determining the tangent length of the material line based on the center distance from the film roller to the battery cell and the radius of the battery cell.

[0092] The line connecting the material line tangent, the cell radius, and the film roller to the initial center of the winding needle can form a right triangle. In order to determine the length of the material line tangent, the cell radius and the distance from the film roller to the initial center of the winding needle can be determined first. The radius of the cell can be directly obtained.

[0093] The center distance between the film roller and the cell can be determined based on the turret rotation angle, turret radius and the initial center distance between the film roller and the winding needle. Can be:

[0094]

[0095] in, represents the turret radius, Indicates the turret rotation angle, Indicates the initial center distance from the film roller to the winding needle.

[0096] In the embodiment of the present application, the line connecting the film roller to the center of the battery cell, the radius of the battery cell, and the tangent of the material line together form a right triangle. After determining the center distance from the film roller to the battery cell and the radius of the battery cell, the length of the tangent of the material line can be determined based on the center distance from the film roller to the battery cell and the radius of the battery cell.

[0097] Exemplarily, the material line tangent length can be:

[0098]

[0099] in, Indicates the tangent length of the material line. Indicates the center distance from the film roller to the cell. Indicates the radius of the battery cell.

[0100] In the embodiment of the present application, the tangent length of the material line is determined by the center distance from the film roller to the battery cell and the radius of the battery cell, thereby improving the accuracy and reliability of the tangent length of the material line.

[0101] According to some embodiments of the present application, the aforementioned step S121 includes: determining the material line arc angle based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; determining the radius of the battery cell; determining the material line arc length based on the radius of the battery cell and the material line arc angle.

[0102] In the embodiment of the present application, the battery cell will also rotate during the station change process. During the rotation of the battery cell, a portion of the material tape will be wrapped around the outer circumference of the battery cell. The length of the material tape is the arc length of the material tape. The arc length of the material tape can be determined by the arc angle of the material tape and the radius of the battery cell.

[0103] In one embodiment, the center distance between the film roller and the winding needle can be determined based on the turret rotation angle, the turret radius and the initial center distance between the film roller and the winding needle; and the material line arc angle can be determined based on the center distance between the film roller and the winding needle.

[0104] Exemplarily, the center distance from the film roller to the winding needle can be:

[0105]

[0106] in, Indicates the center distance from the film roller to the winding needle. represents the turret radius, Indicates the initial center distance from the film roller to the winding needle. Indicates the turret rotation angle.

[0107] After determining the center distance from the film roller to the winding needle, the angle between the film roller, the center of the battery cell and the center of the turret can be determined. Can be:

[0108]

[0109] in, Indicates the center distance from the film roller to the winding needle. represents the turret radius, Indicates the initial center distance from the film roller to the winding needle.

[0110] Exemplarily, the arc angle of the material line can be:

[0111]

[0112] in, Indicates the arc angle of the material line. Indicates the angle between the center of the film roller, the center of the cell and the center of the turret. It indicates the angle between the line from the film roller to the center of the winding needle and the radius of the battery cell.

[0113] The radius of the battery cell can be determined by direct measurement. The radius of the battery cell is related to the length of the wound tape and the thickness of the tape. Therefore, the radius of the battery cell can also be determined by the length of the wound tape and the thickness of the tape.

[0114] After obtaining the arc angle of the material line and the radius of the battery cell, the arc length of the material line can be determined by the calculation formula of the arc length.

[0115] Exemplarily, the arc length of the material line can be:

[0116]

[0117] in, Indicates the arc length of the material line. represents the radius of the battery cell, Indicates the arc angle of the material line.

[0118] In an embodiment of the present application, the material line arc angle is determined based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle, and the material line arc length is determined based on the material line arc angle and the radius of the battery cell, and the obtained material line arc length has a higher accuracy.

[0119] According to some embodiments of the present application, determining the material line arc angle based on the turret rotation angle, turret radius and initial center distance from the film winding roller to the winding needle includes: determining the center distance from the film winding roller to the winding needle based on the turret rotation angle, turret radius and initial center distance from the film winding roller to the winding needle; determining the material line arc angle based on the center distance from the film winding roller to the winding needle.

[0120] Exemplarily, the center distance from the film roller to the winding needle can be:

[0121]

[0122] in, Indicates the center distance from the film roller to the winding needle. represents the turret radius, Indicates the initial center distance from the film roller to the winding needle. Indicates the turret rotation angle.

[0123] After determining the center distance from the film roller to the winding needle, the angle between the film roller, the center of the battery cell and the center of the turret can be determined. Can be:

[0124]

[0125] in, Indicates the center distance from the film roller to the winding needle. represents the turret radius, Indicates the initial center distance from the film roller to the winding needle.

[0126] Exemplarily, the arc angle of the material line can be:

[0127]

[0128] in, Indicates the arc angle of the material line. Indicates the angle between the center of the film roller, the center of the cell and the center of the turret. It indicates the angle between the line from the film roller to the center of the winding needle and the radius of the battery cell.

[0129] In the embodiment of the present application, the material line arc angle is determined according to the center distance from the film-joining roller to the winding needle, which simplifies the calculation process of the material line arc angle.

[0130] According to some embodiments of the present application, the aforementioned step S121 includes: obtaining the winding angle of the battery cell; determining the radius of the battery cell; and determining the winding length of the material wire based on the winding angle and the radius of the battery cell.

[0131] In the embodiment of the present application, the battery cell will also rotate during the workstation change process, and the angle of the battery cell's rotation is the battery cell's winding angle. The battery cell winding angle is an important parameter in the battery cell manufacturing process. A reasonable winding angle can ensure the quality and performance of the battery cell, reduce appearance defects and internal defects, and thus improve the overall performance of the battery. The winding angle of the battery cell can be associated with the target workstation of the battery cell. When the target workstation of the battery cell is determined, the winding angle of the battery cell can be determined. Therefore, corresponding to a specific workstation, the winding angle is a fixed value, which can be directly obtained based on the position of the battery cell.

[0132] The radius of the battery cell can be determined by direct measurement. The radius of the cylindrical battery cell is related to the length of the wound material strip and the thickness of the material strip. Therefore, the radius of the cylindrical battery cell can also be determined by the length of the wound material strip and the thickness of the material strip.

[0133] After obtaining the winding angle and radius of the battery cell, the winding length of the material wire can be determined by the calculation formula of the arc length.

[0134] Exemplary: The winding length of the material line can be:

[0135]

[0136] in, Indicates the winding length of the material line. represents the radius of the battery cell, Indicates the winding angle of the battery cell.

[0137] In the embodiment of the present application, the winding length of the material wire is determined based on the winding angle of the battery cell and the radius of the battery cell, which can make the calculation process of the winding length of the material wire simpler, thereby improving the calculation efficiency of the winding length of the material wire.

[0138] According to some embodiments of the present application, the method further includes: the battery cell moves along a preset trajectory.

[0139] In the embodiment of the present application, the change of the cell movement trajectory during the cell change process will increase the difficulty of calculating the length of the material line, and may cause a large error in the calculation result of the change in the length of the material line. In order to reduce the influence of external factors on the unwinding control, the cell can be controlled to move along a preset trajectory.

[0140] In the embodiment of the present application, during the process of changing workstations, the battery cells move along a preset trajectory, thereby improving the safety and reliability of unwinding control during the process of changing workstations.

[0141] Some embodiments of the present application provide a reel unwinding control device for a station change process, Figure 5 This is a block diagram of an unwinding control device for a station change process in some embodiments of the present application. Figure 5 As shown, the unwinding control device 500 of the workstation changing process includes: an acquisition module 510, configured to acquire the turret rotation angle, turret radius and initial center distance from the film roller to the battery cell of the current workstation of the battery cell, wherein the turret rotation angle of the initial workstation of the battery cell is zero; a model establishment module 520, configured to establish a material line length calculation model based on the turret rotation angle, turret radius and initial center distance from the film roller to the winding needle, wherein the total length of the material line from the film roller to the battery cell and the material line wound onto the battery cell during the workstation changing process; a change determination module 530, configured to determine the change in the material line length based on the material line length calculation model, the current workstation of the battery cell and the target workstation of the battery cell; an unwinding speed determination module 540, configured to determine the unwinding speed of the material strip based on the change in the length of the material strip and the moving time of the battery cell; and an unwinding module 550, configured to control the unwinding drive module to unwind the material strip according to the unwinding speed.

[0142] The unwinding control device for the workstation change process in this embodiment can have all the beneficial effects of the unwinding control method for the workstation change process described above, which will not be described in detail here.

[0143] In some embodiments, the model building module includes: a length determination unit, configured to determine the material line tangent length, material line arc length and material line winding length based on the turret rotation angle, turret radius and initial center distance from the film roller to the winding needle; a model building unit, configured to establish a material line length calculation model based on the material line tangent length, material line arc length and material line winding length.

[0144] In some embodiments, the length determination unit includes: a center distance determination unit, configured to determine the center distance from the film roller to the battery cell based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; a tangent length determination unit, configured to determine the tangent length of the material line based on the center distance from the film roller to the battery cell and the turret radius.

[0145] In some embodiments, the length determination unit includes: an arc angle determination unit, configured to determine the arc angle of the material line based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; a radius determination unit, configured to determine the radius of the battery cell; and an arc length determination unit, configured to determine the arc length of the material line based on the radius of the battery cell and the arc angle of the material line.

[0146] In some embodiments, the arc angle determination unit includes: a center distance determination unit, configured to determine the center distance from the film roller to the winding needle based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; an arc angle determination subunit, configured to determine the arc angle of the material line based on the center distance from the film roller to the winding needle.

[0147] In some embodiments, the length determination unit includes: an angle acquisition unit configured to acquire the winding angle of the battery cell; a radius determination unit configured to determine the radius of the battery cell; and a winding length determination unit configured to determine the winding length of the material wire based on the winding angle and the radius of the battery cell.

[0148] According to another aspect of the present application, a controller is also provided, including a memory and a processor, the memory being used to store computer executable instructions; the processor being used to access the memory and execute computer executable instructions to perform the operations in the unwinding control method of the workstation change process of any of the aforementioned embodiments.

[0149] In one embodiment, the processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment may be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods and steps disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware decoding processor, or may be executed by a combination of hardware and software modules in a decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0150] In one embodiment, the memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0151] According to another aspect of the present application, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the unwinding control method for the workstation change process of any one of the aforementioned embodiments is implemented during execution.

[0152] According to another aspect of the present application, a computer program product is also provided, including a computer-readable code, or a non-volatile computer-readable storage medium carrying the computer-readable code. When the computer-readable code runs in an electronic device, a processor in the electronic device executes a method for implementing any one of the aforementioned embodiments.

[0153] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0154] The technical solution of the present application is further described below through a specific embodiment. Figure 6 The process of the unwinding control method in the station change process of some embodiments of the present application Figure 3 ,like Figure 6 As shown, the method includes:

[0155] Step S601, obtaining the turret rotation angle, turret radius and initial center distance between the film roller and the battery cell at the current station of the battery cell, wherein the turret rotation angle at the initial station of the battery cell is zero.

[0156] Step S602, determining the center distance between the film-joining roller and the battery cell based on the turret rotation angle, the turret radius and the initial center distance between the film-joining roller and the winding needle.

[0157] Step S603, determining the radius of the battery cell.

[0158] Step S604, determining the tangent length of the material line based on the center distance from the film roller to the battery cell and the radius of the battery cell.

[0159] Step S605, determining the arc angle of the material line based on the center distance from the film-joining roller to the winding needle.

[0160] Step S606, determining the arc length of the material line based on the radius of the battery cell and the arc angle of the material line.

[0161] Step S607, obtaining the winding angle of the battery cell.

[0162] Step S608, determining the winding length of the wire based on the winding angle and the radius of the battery cell.

[0163] Step S609, establishing a material line length calculation model according to the material line tangent length, the material line arc length and the material line winding length.

[0164] Step S610, determining the change in the length of the material line based on the material line length calculation model, the current position of the battery cell, and the target position of the battery cell.

[0165] Step S611, determining the unwinding speed of the material tape based on the change in the length of the material tape and the movement time of the battery cell.

[0166] Step S612, controlling the unwinding driving module to unwind the material tape according to the unwinding speed.

[0167] The above steps S604 to S608 may be performed in any order.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for controlling unwinding during a station change process, characterized in that: The method comprises: Obtain the turret rotation angle, turret radius, and initial center distance from the film roller to the cell at the current cell station, where the turret rotation angle at the initial cell station is zero; Based on the turret rotation angle, the turret radius and the initial center distance from the film-joining roller to the winding needle, a material line length calculation model is established, wherein the material line length is the total length of the material line from the film-joining roller to the battery cell and the material line wound onto the battery cell during the station change process; Determine the change in the length of the material line based on the material line length calculation model, the current position of the battery cell, and the target position of the battery cell; Determining the unwinding speed of the tape based on the change in length of the tape and the moving time of the battery cell; and The unwinding driving module is controlled according to the unwinding speed to unwind the material tape.

2. The unwinding control method in the station change process according to claim 1 is characterized in that: The establishing of the material line length calculation model based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle comprises: Based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle, determine the material line tangent length, material line arc length and material line winding length; A material line length calculation model is established according to the material line tangent length, the material line arc length and the material line winding length.

3. The unwinding control method in the station change process according to claim 2, characterized in that: Determining the material line tangent length based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle includes: Determine the center distance between the film-joining roller and the battery cell based on the rotation angle of the turret, the radius of the turret and the initial center distance between the film-joining roller and the winding needle; The tangent length of the material line is determined based on the center distance from the film roller to the battery cell and the radius of the battery cell.

4. The unwinding control method in the station change process according to claim 2 is characterized in that: Determining the arc length of the material line based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle includes: Determine the material line arc angle based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; Determining the radius of the battery cell; The arc length of the material line is determined based on the radius of the battery cell and the arc angle of the material line.

5. The unwinding control method in the station change process according to claim 4, characterized in that: Determining the material line arc angle based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle includes: Determine the center distance between the film winding roller and the winding needle based on the turret rotation angle, the turret radius and the initial center distance between the film winding roller and the winding needle; The material line arc angle is determined based on the center distance from the film winding roller to the winding needle.

6. The unwinding control method in the station change process according to claim 2, characterized in that: The determining of the winding length of the material line based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle comprises: Obtaining a winding angle of the battery cell; Determining the radius of the battery cell; The winding length of the wire is determined based on the winding angle and the radius of the battery cell.

7. The unwinding control method in the station change process according to any one of claims 1 to 6, characterized in that: The method further includes: the battery cell moves along a preset trajectory.

8. A reel unwinding control device for a station change process, characterized in that: The device comprises An acquisition module is configured to acquire a turret rotation angle, a turret radius, and an initial center distance from a film roller to a cell at a current station of the cell, wherein the turret rotation angle at an initial station of the cell is zero; A model building module is configured to build a material line length calculation model based on the turret rotation angle, the turret radius and the initial center distance from the film-joining roller to the winding needle, wherein the total length of the material line from the film-joining roller to the battery cell and the total length of the material line wound onto the battery cell during the station change process; A change amount determination module is configured to determine the change amount of the material line length based on the material line length calculation model, the current position of the battery cell and the target position of the battery cell; an unwinding speed determination module, configured to determine the unwinding speed of the material strip based on the length change of the material line and the moving time of the battery cell; and The unwinding module is configured to control the unwinding driving module to unwind the material tape according to the unwinding speed.

9. The unwinding control device for the station change process according to claim 8, characterized in that: The model building module includes: A length determination unit is configured to determine the material line tangent length, the material line arc length and the material line winding length based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; The model building unit is configured to build the material line length calculation model according to the material line tangent length, the material line arc length and the material line winding length.

10. The unwinding control device for the station change process according to claim 9, characterized in that: The length determination unit comprises: A center distance determination unit is configured to determine the center distance between the film-joining roller and the battery cell based on the rotation angle of the turret, the radius of the turret and the initial center distance between the film-joining roller and the winding needle; The tangent length determination unit is configured to determine the tangent length of the material line based on the center distance from the film roller to the battery cell and the turret radius.

11. The unwinding control device for the station change process according to claim 9, characterized in that: The length determination unit comprises: An arc angle determination unit is configured to determine the arc angle of the material line based on the turret rotation angle, the turret radius and the initial center distance from the film roller to the winding needle; a radius determination unit, configured to determine the radius of the battery cell; The arc length determination unit is configured to determine the arc length of the material line based on the radius of the battery cell and the arc angle of the material line.

12. The unwinding control device for the station change process according to claim 11, characterized in that: The arc angle determination unit comprises: A center distance determination unit is configured to determine the center distance from the film combining roller to the winding needle based on the turret rotation angle, the turret radius and the initial center distance from the film combining roller to the winding needle; The arc angle determination subunit is configured to determine the arc angle of the material line based on the center distance from the film winding roller to the winding needle.

13. The unwinding control device for the station change process according to claim 9, characterized in that: The length determination unit comprises: An angle acquisition unit, configured to acquire a winding angle of the battery cell; a radius determination unit, configured to determine the radius of the battery cell; The winding length determination unit is configured to determine the winding length of the material line based on the winding angle and the radius of the battery cell.

14. A controller, characterized in that: include: A memory and a processor, the memory is used to store computer executable instructions; The processor is used to access the memory and execute computer executable instructions to perform the operations in any one of claims 1 to 7.

15. A computer-readable storage medium, characterized in that: Instructions are stored, which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to perform the method of any one of claims 1 to 7.

16. A computer program product, characterized in that The method comprises instructions which, when executed individually or collectively by one or more processors of a computing device, cause the computing device to perform the method of any one of claims 1 to 7.

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