Winding device
By actively controlling the buffer length and tension of the coil in the winding device, the tension and velocity fluctuations caused by the traditional PID control method during high-speed winding are solved, and the winding efficiency and quality are improved.
Patent Information
- Application Number
- CN202421014111.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-05-10
AI Technical Summary
During high-speed winding, traditional PID regulation methods cause large fluctuations in tension and speed, which are prone to quality problems such as failing to meet the core overhang, diaphragm wrinkling, pole wrinkling and broken belts, and the equipment investment cost is high.
A winding device is designed to realize active control of the length and tension of the coil material buffer by providing an electronic cam in the buffer mechanism and the tension control mechanism. Specific measures include setting the position of the electronic cam in advance when each turn is wound, and driving the driving roller to move to the set position through a linear motor to adjust the buffer length and tension of the coil.
By actively controlling tension and speed, the hysteresis of traditional PID control methods is avoided, the risk of core wrinkling and breaking belts is reduced, and the winding efficiency and core quality are improved.
Smart Images
Figure CN222653992U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a winding device. Background Art
[0002] The electrode assembly of the battery cell generally includes two methods: winding and lamination. At present, for winding, as the requirements for winding speed are increasing day by day, the tension and speed fluctuate greatly during high-speed operation, and PID control lag is prone to occur, resulting in substandard core overhang and quality problems such as diaphragm wrinkling, electrode wrinkling, and electrode breakage. Although a lot of optimization has been done on the PID closed-loop control algorithm, it is still unable to break through the efficiency bottleneck, resulting in high equipment investment costs. Utility Model Content
[0003] The present application provides a winding device to solve or at least improve the problems in the above-mentioned background technology, realize active control of tension and active control of speed, avoid the lag of traditional PID control methods, and improve the winding quality of the core.
[0004] The utility model provides a winding device, which is provided with: a reeling mechanism for reeling a coil; a buffer mechanism for buffering the coil; the buffer mechanism comprises at least one fixed roller and a first electronic cam, the first electronic cam is configured to be able to move to adjust the buffer length of the coil; a main driving mechanism is used to drive the coil to be transported downstream; a tension control mechanism comprises at least one fixed roller and a second electronic cam, the second electronic cam is configured to be able to move to adjust the tension of the coil; and a winding mechanism is used to wind the coil.
[0005] Furthermore, the tension control mechanism also includes a third electronic cam, and the third electronic cam is configured to be able to move to adjust the tension of the coil together with the second electronic cam.
[0006] Further, the first electronic cam includes a first movable roller and a first driver, the first driver is used to drive the first movable roller to move to change its position; and / or, the second electronic cam includes a second movable roller and a second driver, the second driver is used to drive the second movable roller to move to change its position; and / or, the third electronic cam includes a third movable roller and a third driver, the third driver is used to drive the third movable roller to move to change its position.
[0007] Furthermore, the first driver, the second driver and the third driver are all linear motors.
[0008] Furthermore, there are multiple fixed rollers in the buffer mechanism, and along the transmission direction of the coil, the first electronic cam is arranged between two adjacent fixed rollers.
[0009] Furthermore, there are multiple fixed rollers in the tension control mechanism, and along the transmission direction of the coil, the second electronic cam is arranged between two adjacent fixed rollers, and the third electronic cam is arranged between two adjacent fixed rollers.
[0010] Furthermore, a spring roller is provided between the main driving mechanism and the tension control mechanism.
[0011] Furthermore, a tension detection mechanism is provided downstream of the tension control mechanism.
[0012] Furthermore, the coiled material is a positive electrode sheet, a negative electrode sheet or a separator.
[0013] The present application sets the position of each electronic cam in advance when the core is wound each circle according to the tension required for each circle of winding, and controls the movement of each electronic cam according to the set position when executing each circle of winding, so that it moves to the set position, thereby realizing active control of tension and active control of speed, avoiding the lag in traditional PID control methods, reducing the risk of core wrinkling and belt breakage, and improving winding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of a winding device according to an embodiment of the present application.
[0015] Figure 2 It is a flow chart of a winding method according to one embodiment of the present application. DETAILED DESCRIPTION
[0016] Many specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.
[0017] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0018] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0019] In the description of the present invention, reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some implementation methods" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.
[0020] The present application provides a winding device and a winding method.
[0021] See also Figure 1 The winding device of the present application is provided with, from upstream to downstream,: an unwinding mechanism 10 for unwinding the coil; a buffer mechanism 20 for buffering the coil; a main driving mechanism 30 for driving the coil to be transported downstream; a tension control mechanism 40 for adjusting the tension of the coil; and a winding mechanism 50 for winding the coil.
[0022] In a specific embodiment, the coiled material is a pole piece or a diaphragm. When used to manufacture the core of the battery cell, the unwinding mechanism 10, the cache mechanism 20, the main drive mechanism 30 and the tension control mechanism 40 each include multiple ones. Generally speaking, the winding structure of the core is an upper diaphragm, a positive pole piece, a lower diaphragm and a negative pole piece. Therefore, the unwinding mechanism 10, the cache mechanism 20, the main drive mechanism 30 and the tension control mechanism 40 each have four. The upper diaphragm, the positive pole piece, the lower diaphragm and the negative pole piece are respectively released by their respective unwinding mechanisms 10, and pass through the cache mechanism 20, the main drive mechanism 30 and the tension control mechanism 40 in turn, and finally are wound at the same winding mechanism 50, so that the upper diaphragm, the positive pole piece, the lower diaphragm and the negative pole piece are wound into a core. It can be understood that Figure 1 A set of unwinding mechanisms 10, a buffer mechanism 20, a main drive mechanism 30, a tension control mechanism 40, and a winding mechanism 50 are shown for example only. The winding mechanism 50 overlaps the upper diaphragm, the positive electrode sheet, the lower diaphragm and the negative electrode sheet respectively unwound by the four unwinding mechanisms 10 and winds them into a winding core.
[0023] Specifically, the unwinding mechanism 10 of the present application includes an unwinding roller 11 for unwinding the pole piece or the diaphragm.
[0024] The buffer mechanism 20 includes at least one fixed roller and a first electronic cam 21. Exemplarily, there are three fixed rollers, namely, a first fixed roller 221, a second fixed roller 222 and a third fixed roller 223. Along the transmission direction of the coil, the first electronic cam 21 is arranged between the adjacent second fixed roller 222 and the third fixed roller 223, that is, the buffer mechanism 20 is sequentially provided with the first fixed roller 221, the second fixed roller 222, the first electronic cam 21 and the third fixed roller 223 along the transmission direction of the coil; the first fixed roller 221, the second fixed roller 222, the first electronic cam 21 and the third fixed roller 223 are arranged in positions so that the conveying path of the coil can be changed; and the first electronic cam 21 is configured to be movable to adjust the buffer length of the coil.
[0025] In a specific embodiment, the first electronic cam 21 includes a first movable roller 210 and a first driver (not shown), and the first driver is used to drive the first movable roller 210 to move according to the control instruction to change its position. Exemplarily, the first driver is a linear motor, so the first movable roller 210 can move along the first direction D1 under the drive of the linear motor. Therefore, during the movement of the first movable roller 210 along the first direction D1, the distance between it and the second fixed roller 222 and the third fixed roller 223 can be changed, thereby realizing the adjustment of the coil buffer length.
[0026] The main driving mechanism 30 includes a pair of driving wheels, which provide the main power for conveying the coiled material and are used to convey the coiled material downstream.
[0027] The tension control mechanism 40 includes a second electronic cam 42, a third electronic cam 43 and at least one fixed roller. Exemplarily, there are four fixed rollers, namely a fourth fixed roller 441, a fifth fixed roller 442, a sixth fixed roller 443 and a seventh fixed roller 444. Along the transmission direction of the coil, the second electronic cam 42 is arranged between the adjacent fourth fixed roller 441 and the fifth fixed roller 442, and the third electronic cam 43 is arranged between the adjacent sixth fixed roller 443 and the seventh fixed roller 444, that is, the tension control mechanism 40 is sequentially provided with the fourth fixed roller 441, the second electronic cam 42, the fifth fixed roller 442, the sixth fixed roller 443, the third electronic cam 43 and the seventh fixed roller 444 along the transmission direction of the coil. The fourth fixed roller 441, the second electronic cam 42, the fifth fixed roller 442, the sixth fixed roller 443, the third electronic cam 43 and the seventh fixed roller 444 are arranged so that the conveying path of the roll material can be changed, and the second electronic cam 42 and the third electronic cam 43 are configured to be able to move to adjust the tension of the roll material.
[0028] In a specific embodiment, the second electronic cam 42 includes a second movable roller 420 and a second driver (not shown), and the second driver is used to drive the second movable roller 420 to move according to the control instruction to change its position; the third electronic cam 43 includes a third movable roller 430 and a third driver (not shown), and the third driver is used to drive the third movable roller 430 to move according to the control instruction to change its position. Exemplarily, the second driver and the third driver are both linear motors, so the second movable roller 420 can move along the second direction D2 under the drive of the linear motor; the third movable roller 430 can move along the third direction D3 under the drive of the linear motor. Therefore, in the process of the second movable roller 420 moving along the second direction D2 and / or the third movable roller 430 moving along the third direction D3, the distance between the second movable roller 420 and the third movable roller 430 along the coil transmission direction can be changed, thereby realizing the adjustment of the coil tension. In this embodiment, the second direction D2 and the third direction D3 can be set to be parallel, so as to improve the tension adjustment efficiency. Of course, in some other implementations, the second direction D2 and the third direction D3 may also be set to form a certain angle, which does not deviate from the essence of the present application.
[0029] It can be understood that the electronic cam utilizes a constructed cam curve to simulate a mechanical cam, which directly inputs the trajectory points into the driver and performs servo control through a set program. Therefore, the electronic cam is usually controlled by a controller.
[0030] The winding mechanism 50 includes a winding needle for winding the pole piece and the diaphragm.
[0031] When the winding device of this embodiment is working, the unwinding mechanism 10 unwinds the pole piece or diaphragm, and the pole piece or diaphragm passes through the buffer mechanism 20. The first electronic cam 21 in the buffer mechanism 20 is controlled by a linear motor to adjust the buffer length of the pole piece or diaphragm. Then the pole piece or diaphragm passes through the main drive mechanism 30, and then passes through the tension control mechanism 40. The tension is controlled by the second electronic cam 42 and the third electronic cam 43, and finally it is wound into a winding core at the winding mechanism 50.
[0032] See also Figure 2 Accordingly, the winding method of the present application includes the following steps, which avoids the lag of feedback control through active control to improve the winding quality.
[0033] Step S1, establishing a cam position and tension comparison table according to the position of the second electronic cam 42 and the position of the third electronic cam 43; and setting the tension required for each winding of the core according to the core winding process requirements.
[0034] In a specific embodiment, the strokes of the second electronic cam 42 and the third electronic cam 43 are divided into n and m respectively; then the positions of the second electronic cam 42 and the third electronic cam 43 are matched in pairs, and the corresponding tension F is set. 11 To Fnm, thus forming a cam position and tension comparison table, as shown in the following table. Among them, the tension corresponding to the cam position setting can be obtained by theoretical calculation, computer simulation or experimental measurement.
[0035]
[0036] Step S2, establishing a first corresponding relationship between the number of turns and the positions of the second electronic cam and the third electronic cam according to the tension required for each turn of winding and the cam position and tension comparison table.
[0037] After setting the required tension for each circle, the cam position corresponding to the tension is obtained by looking up the cam position and tension comparison table, that is, the second electronic cam position and the third electronic cam position are obtained. For example, the tension required for a certain circle of winding is set to F. By looking up the table, the tension F and F 25 If they are the same, it means that during this winding, the second electronic cam 42 should be located at position 2, and the third electronic cam 43 should be located at position 5.
[0038] Step S3, according to the first corresponding relationship, setting the position of the first electronic cam 21 per revolution, thereby establishing a second corresponding relationship between the number of revolutions and the position of the first electronic cam.
[0039] Since the length of the coil between the second electronic cam 42 and the third electronic cam 43 is changed during their movement, the delivery of the coil needs to be adjusted adaptively. Therefore, in this step, according to the position change of the second electronic cam 42 and the third electronic cam 43, the position of the first electronic cam 21 is adaptively set to adjust the buffer length of the coil to adapt to the tension adjustment and match the speed change during the winding process, thereby achieving speed control.
[0040] In a specific embodiment, when performing the winding of a specific battery cell, the correspondence between the positions of the second electronic cam 42 and the third electronic cam 43 and the position of the first electronic cam 21 can be established in advance to form a comparison table, so that the position of the first electronic cam 21 can be obtained according to the positions of the second electronic cam 42 and the third electronic cam 43, and the position of each circle of the first electronic cam 21 can be set according to the first correspondence.
[0041] Step S4: performing a winding operation according to the first corresponding relationship and the second corresponding relationship.
[0042] Specifically, at the beginning of each round of winding, according to the first corresponding relationship between the number of turns and the positions of the second electronic cam and the third electronic cam and the second corresponding relationship between the number of turns and the position of the first electronic cam, the controller controls the first electronic cam 21, the second electronic cam 42 and the third electronic cam 43 to move to the desired position, that is, the first movable roller 210, the second movable roller 420 and the third movable roller 430 are driven to the desired position by the linear motor, wherein the linear motor is operated according to a pre-set program through the controller.
[0043] It can be understood that at the beginning of each winding, the controller controls the first electronic cam 21, the second electronic cam 42 and the third electronic cam 43 to move to the desired positions, including keeping the positions of the first electronic cam 21, the second electronic cam 42 and the third electronic cam 43 unchanged.
[0044] In a specific embodiment, the tension of the coil material of the 1st to 20th turns wound on the winding core is set to a first tension, for example, 200gf, and the tension of the coil material of the 21st to 30th turns is set to a second tension, for example, 300gf; according to the required tension and in comparison with the cam position and tension comparison table, the first cam position of the second electronic cam 42 and the third electronic cam 43 during the 1st to 20th turns, and the second cam position of the second electronic cam 42 and the third electronic cam 43 during the 21st to 30th turns are obtained accordingly; and, according to the change from the first cam position to the second cam position, by looking up the pre-established comparison table between the positions of the second electronic cam 42 and the third electronic cam 43 and the position of the first electronic cam 21, the first electronic cam 21 is correspondingly set to move from the original first cache position to the second cache position to adjust the cache length and control the coil material speed to adapt to the change in the cam position. Based on the above settings, when performing the winding operation, the positions of the first electronic cam 21, the second electronic cam 42 and the third electronic cam 43 are kept unchanged during the 1st to 20th turns of the winding core, and at the beginning of the 21st turn, the first electronic cam 21 is moved from the first cache position to the second cache position, for example, see Figure 1 , the first moving roller 210 is moved to the left by the linear motor, and the second electronic cam 42 and the third electronic cam 43 are moved from the first cam position to the second cam position, for example, the second moving roller 420 is moved upward by the linear motor, and the third moving roller 430 is moved downward by the linear motor. The above-mentioned movement of the second moving roller 420 and the third moving roller 430 increases the distance between them along the web transmission direction, so that the tension can be increased to meet the adjustment of the tension from 200gf to 300gf. At the same time, the leftward movement of the first moving roller 210 reduces the buffer length of the web, that is, releases more webs, and matches the movement of the second moving roller 420 and the third moving roller 430, thereby matching the change in speed during the winding process.
[0045] It should be noted that the above embodiment is only an exemplary description. During actual winding, for each turn, a conventional practice is to calculate the corresponding winding length according to the Archimedean screw formula, and determine whether it is in the corresponding number of turns in combination with the length encoder, and then set the required tension for each turn, and then control the positions of the first electronic cam 21, the second electronic cam 42 and the third electronic cam 43 accordingly.
[0046] Therefore, according to the tension required for each circle of winding, the positions of the first electronic cam 21, the second electronic cam 42 and the third electronic cam 43 are set in advance when the core is wound each circle, and when winding is performed, the first electronic cam 21, the second electronic cam 42 and the third electronic cam 43 are adjusted according to the set positions, thereby realizing active control of the tension and active control of the speed, avoiding the hysteresis in the traditional PID control method, reducing the risk of the core wrinkling and breaking, and improving the winding efficiency.
[0047] It should be noted that, in this embodiment of the present application, since the movement of the electronic cam is ultimately presented through the movement trajectory of the moving roller, the position of the electronic cam can be considered as the position of the corresponding moving roller.
[0048] In addition, since the electronic cam is flexible and its trajectory is easy to change, it is convenient to change the trajectory as needed. Therefore, the winding device and winding method of the present application can be applied to the winding of various types of battery cells such as square shell battery cells, cylindrical battery cells, and battery cells of different sizes, and have wider applicability.
[0049] In another specific embodiment, the tension control mechanism 40 includes a fixed roller and an electronic cam, that is, only the second electronic cam 42 or the third electronic cam 43 is provided. For example, only the second electronic cam 42 is provided, and the third electronic cam 43 is not provided. Since the second electronic cam 42 itself can be controlled and moved to different positions by the controller, the distance between it and the fixed roller can also be adjusted, thereby adjusting the tension of the coil.
[0050] Specifically, in this embodiment, the corresponding winding method includes: establishing a cam position and tension comparison table according to the position of the second electronic cam 42; wherein, the specific method for establishing the cam position and tension comparison table is logically the same as the embodiment described above, and will not be repeated here. At the same time, according to the core winding process requirements, the tension required for each turn of the core is set. According to the tension required for each turn of winding, and the comparison table, a first correspondence between the number of turns and the position of the second electronic cam is established. According to the first correspondence, the position of each turn of the first electronic cam is set, thereby establishing a second correspondence between the number of turns and the position of the first electronic cam. Finally, the winding operation is performed according to the first correspondence and the second correspondence.
[0051] Meanwhile, it can be understood that when the tension control mechanism 40 is provided with the second electronic cam 42 and the third electronic cam 43, since there are two electronic cams and their positions can be controlled respectively by the controller, it has a larger tension adjustment range and higher adjustment accuracy.
[0052] Furthermore, the winding device of the present application also includes a tension detection mechanism 60, which is arranged downstream of the tension control mechanism 40. The tension detection mechanism 60 is used to detect the actual tension and compare it with the set value (that is, the set tension required for the winding core during each winding) to determine whether the two are consistent.
[0053] After performing winding operations sufficiently many times or having enough samples, the winding method of the present application can self-learn based on AI and fine-tune the first corresponding relationship and / or the second corresponding relationship before the winding of the next roll core begins, thereby optimizing the control of the roll tension, buffer length and speed, and ultimately producing a roll core with extremely high consistency at the winding mechanism.
[0054] In other words, in the winding method of the present application, the first corresponding relationship and the second corresponding relationship can be continuously iterated and optimized through AI self-learning.
[0055] In addition, the winding device of the present application may also be provided with a spring roller 70 between the main drive mechanism 30 and the tension control mechanism 40, that is, a fixed roller is connected by a spring, wherein the spring is deformed due to the tension of the coil and changes its deformation according to the change of the tension, so that the spring roller 70 can ensure that the coil is always in a tensioned state.
[0056] Finally, it can be understood that the winding device and winding method of the present application can be applied not only to the winding process of the battery cell, but also to processes involving tension adjustment and control such as electrode coating, which do not deviate from the protection scope of the present application.
[0057] It should be noted that although the utility model is disclosed as above in the form of a preferred embodiment, it is not intended to limit the utility model. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope defined by the claims of the utility model.
Claims
1. A winding device, characterized in that: From upstream to downstream, they are: An unwinding mechanism, used for unwinding the coiled material; A buffer mechanism for buffering the coil; the buffer mechanism comprises at least one fixed roller and a first electronic cam, wherein the first electronic cam is configured to be movable to adjust the buffer length of the coil; A main driving mechanism, used for driving the coil to be transported downstream; A tension control mechanism, comprising at least one fixed roller and a second electronic cam, wherein the second electronic cam is configured to be movable to adjust the tension of the web; And, a winding mechanism is used for winding the coil.
2. The winding device according to claim 1, characterized in that The tension control mechanism further includes a third electronic cam, which is configured to be movable to adjust the tension of the web together with the second electronic cam.
3. The winding device according to claim 2, characterized in that The first electronic cam comprises a first movable roller and a first driver, wherein the first driver is used to drive the first movable roller to move so as to change its position; And / or, the second electronic cam comprises a second movable roller and a second driver, wherein the second driver is used for driving the second movable roller to move so as to change its position; And / or, the third electronic cam includes a third movable roller and a third driver, and the third driver is used for driving the third movable roller to move so as to change its position.
4. The winding device according to claim 3, characterized in that: The first driver, the second driver, and the third driver are all linear motors.
5. The winding device according to claim 1, characterized in that: There are multiple fixed rollers in the buffer mechanism, and along the transmission direction of the coil, the first electronic cam is arranged between two adjacent fixed rollers.
6. The winding device according to claim 2, characterized in that: There are multiple fixed rollers in the tension control mechanism. Along the transmission direction of the coil, the second electronic cam is arranged between two adjacent fixed rollers, and the third electronic cam is arranged between two adjacent fixed rollers.
7. The winding device according to claim 1, characterized in that A spring roller is also arranged between the main driving mechanism and the tension control mechanism.
8. The winding device according to any one of claims 1 to 7, characterized in that: A tension detection mechanism is also provided downstream of the tension control mechanism.
9. The winding device according to claim 1, characterized in that: The coiled material is a positive electrode sheet, a negative electrode sheet or a separator.