Rolling apparatus and its deviation correcting device and method

Abstract

The application provides a rolling device and a deviation correction device and method thereof. The rolling device comprises a unwinding mechanism, a stretching mechanism, a stretching deviation correction detection mechanism and a unwinding deviation correction mechanism. The unwinding mechanism is used to release the pole piece. The stretching mechanism is arranged on the running path of the pole piece, and the stretching mechanism stretches the pole piece. The stretching deviation correction detection mechanism obtains the deviation of the pole piece at the stretching mechanism. If the deviation is greater than a set threshold, a deviation correction signal is sent to the unwinding deviation correction mechanism based on the deviation. The unwinding deviation correction mechanism adjusts the unwinding mechanism to drive the pole piece to move to the deviation correction direction corresponding to the deviation correction signal based on the deviation correction signal, so that the deviation of the pole piece at the stretching mechanism is less than the set threshold. The rolling device of the application can reduce the deviation of the pole piece at the stretching mechanism, ensure uniform stretching of the tab part of the pole piece, greatly reduce the probability of tab warping exceeding the standard, and effectively improve the processing yield of the battery pole piece.

Description

Technical Field

[0001] This application relates to the field of battery processing, specifically to a rolling mill and its correction device and correction method. Background Technology

[0002] Roll forming is a common compaction process used in battery electrode manufacturing. It alters the electrode's pore structure and the distribution of the conductive agent, thus affecting the battery's electrochemical performance. During roll forming, when the electrode strip shifts relative to the pressure rollers of the rolling equipment, the tab portion shifts relative to the Teflon area of ​​the stretching rollers. This can easily lead to insufficient stretching and excessive warping of the tab portion. Excessive tab warping can cause safety hazards such as scrapped sheets and tab folding, thereby reducing the battery electrode processing yield.

[0003] Existing roll forming equipment can only detect the edge position of the electrode at the unwinding position. The unwinding mechanism drives the electrode roll to move to achieve the purpose of correcting unwinding misalignment. However, during the roll forming process, after the first-stage correction, the electrode roll still needs to pass through multiple roller systems. The parallelism of the upper and lower shafts during unwinding, the machining accuracy of the roll, the parallelism and levelness between the rollers, the axial movement of the rollers, and the uneven tension of the incoming material can all cause the electrode roll to deviate during the movement. The first-stage correction of roll forming can only correct the misalignment of the incoming material during unwinding, and cannot adjust the deviation generated during the movement of the electrode. Summary of the Invention

[0004] In view of this, the embodiments of this application aim to provide a rolling equipment and its correction device and correction method to solve the problem that existing rolling equipment cannot repair the electrode sheet during the rolling process, which easily causes excessive warping of the electrode tab.

[0005] The first aspect of this application provides a roll forming device, which includes an unwinding mechanism, a stretching mechanism, a stretching correction and detection mechanism, and an unwinding correction mechanism. The unwinding mechanism is used to release the electrode sheet; The stretching mechanism is disposed on the conveying path of the electrode sheet, and the stretching mechanism is configured to stretch the electrode sheet. The stretching and correction detection mechanism is configured to acquire the offset of the electrode at the stretching mechanism, and send a correction signal to the unwinding and correction mechanism based on the offset when the offset is greater than a set threshold. The unwinding and correction mechanism is configured to adjust the unwinding mechanism based on the correction signal, causing the electrode to move in the correction direction corresponding to the correction signal, so that the offset of the electrode at the stretching mechanism is less than a set threshold.

[0006] Another aspect of this application provides a correction device for a roller pressing equipment, which is applied to the roller pressing equipment, the roller pressing equipment including an unwinding mechanism and a stretching mechanism; The unwinding mechanism is used to release the electrode sheet; the stretching mechanism is disposed on the conveyor path of the electrode sheet and is configured to stretch the electrode sheet. The correction device includes a stretching correction detection mechanism and an unwinding correction mechanism; the stretching correction detection mechanism is configured to acquire the offset of the electrode at the stretching mechanism, and if the offset is greater than a set threshold, send a correction signal to the unwinding correction mechanism based on the offset. The unwinding and correction mechanism is configured to adjust the unwinding mechanism based on the correction signal, causing the electrode to move in the correction direction corresponding to the correction signal, so that the offset of the electrode at the stretching mechanism is less than a set threshold.

[0007] Another aspect of this application provides a method for correcting the deviation of a roller pressing equipment, which is applied to the roller pressing equipment, the roller pressing equipment including an unwinding mechanism and a stretching mechanism; The unwinding mechanism is used to release the electrode sheet; the stretching mechanism is disposed on the conveyor path of the electrode sheet and is configured to stretch the electrode sheet. The correction method includes: Obtain the offset of the electrode at the stretching mechanism; If the offset is greater than a set threshold, a correction signal is sent based on the offset. Based on the correction signal, the unwinding mechanism is adjusted to move the electrode sheet in the correction direction corresponding to the correction signal, so that the offset of the electrode sheet at the stretching mechanism is less than a set threshold.

[0008] Compared to existing rolling equipment, the rolling equipment in this application embodiment can ensure uniform stretching of the electrode tab portion by reducing the offset of the electrode at the stretching mechanism, greatly reducing the probability of excessive electrode tab warping, thereby reducing safety hazards such as scrap sheets and electrode tab folding, and effectively improving the processing yield of battery electrode sheets. Attached Figure Description

[0009] Figure 1 A schematic diagram of the structure of the roller pressing equipment according to an embodiment of this application is shown.

[0010] Figure 2 A schematic diagram illustrating the steps of a method for correcting the alignment of a roller pressing device according to an embodiment of this application is shown.

[0011] Attached image labels: 10. Unwinding mechanism; 20. Tensioning mechanism; 21. Rear tensioning unit; 22. Front tensioning unit; 30. Roller pressing mechanism; 40. Tension correction and testing organization; 41. Correction sensor; 411. Post-correction detection unit; 412. Front correction detection unit; 42. Control unit; 50. Unwinding and correction mechanism; 51. Positioning sensor; 52. Correction motor; 80. Receiving and collecting mechanism. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0014] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0015] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a” and “the” as used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0016] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as “when”, “in response to a determination”, or “upper”, “lower”, “front”, “back”, “left”, “right”, etc., are used only to indicate the relative positional relationship between related parts, and not to limit the absolute position of these related parts. In this document, “equal”, “same”, etc., are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0017] like Figure 1 As shown in the figure, this application embodiment provides a rolling mill device, which includes an unwinding mechanism 10, a stretching mechanism 20, a stretching correction and detection mechanism 40, and an unwinding correction mechanism 50. The unwinding mechanism 10 is used to release the electrode sheet; the stretching mechanism 20 is disposed on the electrode sheet's conveyor path and configured to stretch the electrode sheet. The rolling mill device of this application embodiment may also include a rolling mill mechanism 30, a tension mechanism, a preheating mechanism, a cooling mechanism, and a winding mechanism 80, etc. The rolling mill mechanism 30 is disposed on the electrode sheet's conveyor path and configured to roll the electrode sheet; the winding mechanism 80 is used to collect the electrode sheet processed by the rolling mill device. Specific structures can be found in existing rolling mill devices and will not be described further here.

[0018] It is understandable that during the operation of the roller pressing equipment, the stretching effect of the stretching mechanism 20 is strongly related to the position of the electrode. When the position of the electrode at the stretching mechanism 20 is offset, it will affect the stretching effect of the stretching mechanism 20 and easily lead to excessive warping of the electrode tab.

[0019] Therefore, in the rolling equipment of this application embodiment, the stretching correction detection mechanism 40 is configured to obtain the offset of the electrode at the stretching mechanism 20, and when the offset is greater than a set threshold, send a correction signal to the unwinding correction mechanism 50 based on the offset; the unwinding correction mechanism 50 is configured to adjust the unwinding mechanism 10 based on the correction signal to drive the electrode to move in the correction direction corresponding to the correction signal, so that the offset of the electrode at the stretching mechanism 20 is less than the set threshold.

[0020] In the operation of the rolling equipment of this application embodiment, the unwinding mechanism 10 continuously releases the electrode sheet; the stretching mechanism 20 can stretch the electrode sheet passing through the stretching mechanism 20; the stretching correction detection mechanism 40 can obtain the offset of the electrode sheet at the stretching mechanism 20 in real time, and when the offset is greater than a set threshold, it sends a correction signal to the unwinding correction mechanism 50 based on the offset. The unwinding correction mechanism 50 can adjust the unwinding mechanism 10 based on the correction signal to drive the electrode sheet to move in the correction direction corresponding to the correction signal. After the electrode sheet is corrected, when the electrode sheet passes through the stretching mechanism 20, the offset will gradually decrease to ensure that the offset of the electrode sheet at the stretching mechanism 20 is less than the set threshold.

[0021] Compared to existing rolling equipment, the rolling equipment in this application embodiment can ensure uniform stretching of the electrode tab portion by reducing the offset of the electrode at the stretching mechanism 20, which greatly reduces the probability of excessive electrode tab warping, thereby reducing safety hazards such as scrap sheets and electrode tab folding, and effectively improving the processing yield of battery electrode sheets.

[0022] Furthermore, in one embodiment of this application, the stretching correction detection mechanism 40 is configured to acquire a first offset amount of the electrode at the stretching mechanism 20 in a first direction and a second offset amount in a second direction. If the first offset amount in the first direction is greater than a set threshold, a first correction signal is sent to the unwinding correction mechanism 50 based on the first offset amount. If the second offset amount in the second direction is greater than the set threshold, a second correction signal is sent to the unwinding correction mechanism 50 based on the offset amount. The unwinding correction mechanism 50 is configured to adjust the unwinding mechanism 10 to move the electrode sheet in the second direction based on the first correction signal, so that the first offset of the electrode sheet at the stretching mechanism 20 is reduced to less than a set threshold, and to adjust the unwinding mechanism 10 to move the electrode sheet in the first direction based on the second correction signal, so that the second offset of the electrode sheet at the stretching mechanism 20 is reduced to less than a set threshold.

[0023] It is understandable that the electrode sheet can be offset from the stretching mechanism 20 of the roller pressing equipment in two directions, namely, offset to the left or right relative to its forward direction. The first direction and the second direction mentioned above are offset to the left and offset to the right, respectively.

[0024] Therefore, in the rolling equipment of this application embodiment, when the first offset of the electrode sheet in the first direction is greater than a set threshold, the stretching correction detection mechanism 40 can obtain the first offset of the electrode sheet in the first direction at the stretching mechanism 20, and then send a first correction signal to the unwinding correction mechanism 50 based on the first offset. The unwinding correction mechanism 50 can adjust the unwinding mechanism 10 to move the electrode sheet in the second direction based on the first correction signal, so that the first offset of the electrode sheet at the stretching mechanism 20 is reduced to less than the set threshold, and gradually returns to the center position. When the first offset of the electrode sheet in the second direction is greater than the set threshold, the working process is similar, and will not be described again here.

[0025] Therefore, during the operation of the rolling equipment in this application embodiment, when the electrode at the stretching mechanism 20 shifts to the left or right relative to its forward direction, the stretching correction detection mechanism 40 can obtain the offset direction and offset amount of the electrode in real time. The unwinding correction mechanism 50 can adjust the unwinding mechanism 10 to drive the electrode to move in the correction direction corresponding to the correction signal based on the correction signal corresponding to the offset direction, so that the electrode at the stretching mechanism 20 gradually returns to the center position, thereby realizing bidirectional correction.

[0026] It is understandable that if the stretching correction detection mechanism 40 malfunctions and continues to send correction signals when the electrode offset is small or not offset, the unwinding mechanism 10 will drive the electrode to move continuously in the first or second direction. When the unwinding mechanism 10 moves too much in either direction, the unwinding mechanism 10 of the roll forming equipment may collide with other mechanisms, leading to more serious malfunctions.

[0027] Therefore, in one embodiment of this application, the tension correction detection mechanism 40 is configured to send an alarm signal after the unwinding mechanism 10 moves the electrode sheet in the first or second direction to an alarm preset threshold. That is, when the tension correction detection mechanism 40 sends an alarm signal after the unwinding mechanism 10 moves the electrode sheet in the first or second direction to an alarm preset threshold, it reminds the operator to promptly shut down the rolling mill, inspect and repair it, and prevent more serious malfunctions.

[0028] Specifically, in one embodiment of this application, the unwinding correction mechanism 50 is configured to adjust the unwinding mechanism 10 to move the electrode sheet a unit set distance in the correction direction corresponding to the correction signal based on the correction signal, so that the offset of the electrode sheet at the stretching mechanism 20 is less than a set threshold.

[0029] In the operation of the rolling equipment in this embodiment, the stretching correction detection mechanism 40 can obtain the offset of the electrode at the stretching mechanism 20 in real time, and send a correction signal to the unwinding correction mechanism 50 based on the offset when the offset is greater than a set threshold. Regardless of the offset, after receiving the correction signal each time, the unwinding correction mechanism 50 adjusts the unwinding mechanism 10 to move the electrode in the correction direction corresponding to the correction signal by a set distance until the offset of the electrode at the stretching mechanism 20 is less than the set threshold.

[0030] In this way, the unwinding correction mechanism 50 of this application embodiment adjusts the movement of the unwinding mechanism 10 by a set distance each time, thereby making the movement range of the unwinding mechanism 10 controllable and the correction adjustment process can be carried out smoothly, so as to improve the controllability of the correction adjustment process.

[0031] In another embodiment of this application, the unwinding correction mechanism 50 is configured to adjust the unwinding mechanism 10 to move the electrode sheet by an offset amount corresponding to a set distance in the correction direction corresponding to the correction signal, based on the correction signal, so that the offset of the electrode sheet at the stretching mechanism 20 is less than a set threshold.

[0032] In the operation of the rolling mill in this embodiment, the stretching correction detection mechanism 40 can acquire the offset of the electrode sheet at the stretching mechanism 20 in real time. When the offset is greater than a set threshold, it sends a correction signal to the unwinding correction mechanism 50 based on the offset. When the offset corresponding to the correction signal is large, the unwinding correction mechanism 50 adjusts the unwinding mechanism 10 to move the electrode sheet a relatively large distance in the correction direction corresponding to the correction signal. When the offset corresponding to the correction signal is small, the unwinding correction mechanism 50 adjusts the unwinding mechanism 10 to move the electrode sheet a relatively small distance in the correction direction corresponding to the correction signal. Compared to the aforementioned unwinding correction mechanism 50, the distance that the unwinding correction mechanism 50 adjusts to move the unwinding mechanism 10 in this embodiment is related to the offset, thereby enabling the unwinding mechanism 10 to correct the electrode roll offset as quickly as possible and improve the correction speed.

[0033] Understandably, when the stretching correction detection mechanism 40 detects that the offset of the electrode at the stretching mechanism 20 is greater than the set threshold, it sends a correction signal to the unwinding correction mechanism 50. After the unwinding correction mechanism 50 adjusts the unwinding mechanism 10 to move the electrode in the correction direction corresponding to the correction signal, the electrode after correction moves from the unwinding mechanism 10 to the stretching mechanism 20, which takes a certain amount of time.

[0034] like Figure 1As shown, in one embodiment of this application, the stretching correction detection mechanism 40 includes a correction sensor 41 and a control unit 42; the correction sensor 41 is configured to acquire the offset of the electrode at the stretching mechanism 20, and the control unit 42 is configured to send a correction signal to the unwinding correction mechanism 50 based on the offset when the offset is greater than a set threshold, and to send the correction signal to the unwinding correction mechanism 50 only once within the motion cycle, wherein the motion cycle is greater than or equal to the time required for the electrode to move from the unwinding mechanism 10 to the stretching mechanism 20.

[0035] In the operation of the rolling equipment in this application embodiment, the unwinding correction mechanism 50 adjusts the unwinding mechanism 10 to drive the electrode sheet to move in the correction direction corresponding to the correction signal. After the correction, the electrode sheet moves from the unwinding mechanism 10 to the stretching mechanism 20. After the correction sensor 41 obtains the offset of the electrode sheet after the correction moves to the stretching mechanism 20, if the offset is still greater than the set threshold, the control unit 42 will send a correction signal to the unwinding correction mechanism 50 again to avoid the unwinding mechanism 10 moving too much in any direction in a short period of time, which would cause the electrode roll offset to shrink and then continue to increase.

[0036] It is understandable that the time required for the electrode sheet to move from the unwinding mechanism 10 to the stretching mechanism 20 can be obtained from the distance the electrode sheet moves from the unwinding mechanism 10 to the stretching mechanism 20 and the speed of the electrode sheet. The speed of the electrode sheet can be obtained by using the rotation speed and radius of any rotating roller of the rolling equipment. The rotation speed of the rotating roller can be obtained by using an encoder or other devices. The principle will not be elaborated here.

[0037] During the electrode rolling process, the electrode usually needs to be stretched after passing through the rolling mechanism 30. Therefore, as Figure 1 As shown, in one embodiment of this application, the stretching mechanism 20 includes a rear stretching unit 21, which is disposed on the rear side of the rolling mechanism 30 on the belt path of the electrode sheet; the stretching correction detection mechanism 40 includes a rear correction detection unit 411, which is disposed at the location of the rear stretching unit 21 and is configured to obtain the rear offset of the electrode sheet at the rear stretching unit 21, and send a rear correction signal to the unwinding correction mechanism 50 based on the rear offset when the rear offset is greater than a first set threshold.

[0038] In the rolling equipment of this application embodiment, the post-stretching unit 21 can perform post-stretching on the electrode after the rolling mechanism 30 rolls the electrode. The post-correction detection unit 411 can obtain the post-offset of the electrode at the post-stretching unit 21. If the post-offset is greater than the first set threshold, a post-correction signal is sent to the unwinding correction mechanism 50 based on the post-offset. The unwinding correction mechanism 50 can adjust the unwinding mechanism 10 to drive the electrode to move in the correction direction corresponding to the correction signal based on the post-correction signal. After the electrode is corrected, the offset will gradually decrease when the electrode passes through the post-stretching unit 21 to ensure that the offset of the electrode at the post-stretching unit 21 is less than the first set threshold.

[0039] like Figure 1 As shown, in one embodiment of this application, the control unit 42 is configured to send a back-correction signal to the unwinding correction mechanism 50 based on the back offset when the back offset is greater than a first set threshold, and to send the back-correction signal to the unwinding correction mechanism 50 only once in a first motion cycle, wherein the first motion cycle is greater than or equal to the time required for the electrode to move from the unwinding mechanism 10 to the back-stretching unit 21.

[0040] In the operation of the rolling equipment in this embodiment, when the back offset is greater than the first set threshold, the control unit 42 sends a back offset signal to the unwinding correction mechanism 50 based on the back offset. The unwinding correction mechanism 50 adjusts the unwinding mechanism 10 based on the back offset signal to drive the electrode sheet to move in the correction direction corresponding to the correction signal. After the correction, the electrode sheet moves from the unwinding mechanism 10 to the back stretching unit 21. After the back offset detection unit 411 obtains the offset of the electrode sheet after the correction moves to the back stretching unit 21, if the back offset is still greater than the set threshold, the control unit 42 will send a back offset signal to the unwinding correction mechanism 50 again to avoid the unwinding mechanism 10 moving too much in any direction in a short period of time, which would cause the electrode roll offset to shrink and then continue to increase.

[0041] It is understandable that the time required for the electrode sheet to move from the unwinding mechanism 10 to the post-tensioning unit 21 can be obtained from the distance the electrode sheet moves from the unwinding mechanism 10 to the post-tensioning unit 21 and the speed of the electrode sheet. The speed of the electrode sheet can be obtained by using the rotation speed and radius of any rotating roller of the roller pressing equipment. The rotation speed of the rotating roller can be obtained by using an encoder or other devices. The principle will not be elaborated here.

[0042] Specifically, in one embodiment of this application, the first set threshold is 0.3mm. When the first set threshold is 0.3mm, the post-correction detection unit 411 can obtain the post-offset of the electrode at the post-tensioning unit 21. If the post-offset is greater than 0.3mm, a post-correction signal is sent to the unwinding correction mechanism 50 based on the post-offset. The unwinding correction mechanism 50 can adjust the unwinding mechanism 10 based on the post-correction signal to drive the electrode to move in the correction direction corresponding to the correction signal, so as to ensure that the offset of the electrode at the post-tensioning unit 21 is less than 0.3mm.

[0043] For some electrodes, during the electrode rolling process, a pre-stretching process is required before the electrode passes through the rolling mechanism 30. Therefore, as... Figure 1 As shown, in one embodiment of this application, the stretching mechanism 20 further includes a front stretching unit 22, which is disposed on the front side of the roller pressing mechanism 30 on the belt path of the electrode sheet. The stretching correction detection mechanism 40 includes a front correction detection unit 412, which is located at the front stretching unit 22 and is configured to acquire the front offset of the electrode at the front stretching unit 22. If the front offset is greater than a second set threshold, a front correction signal is sent to the unwinding correction mechanism 50 based on the front offset.

[0044] In the rolling equipment of this application embodiment, the front stretching unit 22 can stretch the electrode sheet before the rolling mechanism 30 rolls the electrode sheet. The front correction detection unit 412 can obtain the front offset of the electrode sheet at the front stretching unit 22. When the front offset is greater than the second set threshold, the front correction signal is sent to the unwinding correction mechanism 50 based on the front offset. The unwinding correction mechanism 50 can adjust the unwinding mechanism 10 to drive the electrode sheet to move in the correction direction corresponding to the correction signal based on the front correction signal. After the electrode sheet is corrected, when the electrode sheet passes the front stretching unit 22, the offset will gradually decrease to ensure that the offset of the electrode sheet at the front stretching unit 22 is less than the second set threshold.

[0045] Therefore, the rolling equipment of this application embodiment, by setting a front stretching unit 22 and a rear stretching unit 21, can perform front stretching of the electrode sheet before the rolling mechanism 30 rolls the electrode sheet, and perform rear stretching of the electrode sheet after the rolling mechanism 30 rolls the electrode sheet. It is also equipped with a front correction detection unit 412 and a rear correction detection unit 411 to ensure that the offset of the electrode sheet at the rear stretching unit 21 is less than a first set threshold, and the offset of the electrode sheet at the front stretching unit 22 is less than a second set threshold, thereby further reducing the electrode sheet offset.

[0046] Therefore, in one embodiment of this application, when both a front correction detection unit 412 and a rear correction detection unit 411 are provided, the control unit 42 sends a rear correction signal to the unwinding correction mechanism 50 based on the rear offset when the rear offset is greater than a first set threshold, and sends a front correction signal to the unwinding correction mechanism 50 based on the front offset when the front offset is greater than a second set threshold.

[0047] Furthermore, the control unit 42 sends a correction signal to the unwinding correction mechanism 50 only once in the first motion cycle after the rear correction signal is sent, and sends a correction signal to the unwinding correction mechanism 50 only once in the second motion cycle after the front correction signal is sent. The first motion cycle is greater than or equal to the time required for the electrode to move from the unwinding mechanism 10 to the rear stretching unit 21, and the second motion cycle is greater than or equal to the time required for the electrode to move from the unwinding mechanism 10 to the front stretching unit 22.

[0048] In the operation of the rolling equipment in this embodiment, after the control unit 42 sends a back-correction signal to the unwinding correction mechanism 50 based on the back offset, the unwinding correction mechanism 50 adjusts the unwinding mechanism 10 based on the back-correction signal to drive the electrode sheet to move in the correction direction corresponding to the correction signal. After the correction, the electrode sheet moves from the unwinding mechanism 10 to the back-stretching unit 21. After the back-correction detection unit 411 obtains the offset of the electrode sheet after the correction moves to the back-stretching unit 21, if the back offset is still greater than the set threshold, the control unit 42 will send a back-correction signal to the unwinding correction mechanism 50 again. If the front offset is still greater than the set threshold, the control unit 42 will send a front offset signal to the unwinding correction mechanism 50 once, so as to avoid the unwinding mechanism 10 moving too much in any direction in a short period of time, which would cause the electrode roll offset to shrink and then continue to increase.

[0049] Similarly, after the control unit 42 sends a forward correction signal to the unwinding correction mechanism 50 based on the forward offset, the unwinding correction mechanism 50 adjusts the unwinding mechanism 10 based on the forward correction signal to drive the electrode sheet to move in the correction direction corresponding to the correction signal. After the correction, the electrode sheet moves from the unwinding mechanism 10 to the front stretching unit 22. Before the forward correction detection unit 412 obtains the offset of the electrode sheet after the correction moves to the front stretching unit 22, if the backward offset is still greater than the set threshold, the control unit 42 will send a backward correction signal to the unwinding correction mechanism 50 again. If the forward offset is still greater than the set threshold, the control unit 42 will send a forward correction signal to the unwinding correction mechanism 50 once, so as to avoid the unwinding mechanism 10 moving too much in any direction in a short period of time, which would cause the electrode offset to shrink and then continue to increase.

[0050] The first time period mentioned above can be greater than or equal to the second time period. Both can be adjusted as needed, and no restrictions are imposed here.

[0051] In one embodiment of this application, the second set threshold is greater than the first set threshold. It is understood that the precision requirements of the post-stretching process are higher than those of the pre-stretching process. Therefore, by making the second set threshold greater than the first set threshold, the positional accuracy of the electrode at the post-stretching unit 21 can be effectively improved. The trigger frequency of the post-correction signal of the post-correction detection unit 411 is greater than the trigger frequency of the pre-correction signal of the pre-correction unit. The correction process of the post-stretching unit 21 is a fine adjustment and plays an active role, while the correction process of the pre-stretching unit 22 is a coarse adjustment and plays an auxiliary role.

[0052] Specifically, in one embodiment of this application, the second set threshold is 0.5mm. When the second set threshold is 0.5mm, the front correction detection unit 412 can obtain the front offset of the electrode at the front stretching unit 22. If the front offset is greater than 0.5mm, a front correction signal is sent to the unwinding correction mechanism 50 based on the front offset. The unwinding correction mechanism 50 can adjust the unwinding mechanism 10 based on the front correction signal to drive the electrode to move in the correction direction corresponding to the correction signal, so as to ensure that the offset of the electrode at the front stretching unit 22 is less than 0.5mm.

[0053] The threshold values ​​mentioned above can be adjusted as needed, and no restrictions are imposed here.

[0054] It is understood that the structure of the unwinding and correction mechanism 50 can be varied. In one embodiment of this application, the unwinding and correction mechanism 50 includes a positioning sensor 51 and a correction motor 52. The correction motor 52 is configured to drive the positioning sensor 51 to move in the correction direction corresponding to the correction signal based on the correction signal. The positioning sensor 51 is configured to acquire the unwinding offset of the electrode at the unwinding mechanism 10. The unwinding mechanism 10 is configured to drive the electrode to move based on the unwinding offset, so that the unwinding offset is less than the unwinding set threshold.

[0055] During the operation of the unwinding and correction mechanism 50, the positioning sensor 51 can acquire the unwinding offset of the electrode sheet at the unwinding mechanism 10 in real time. Based on the unwinding offset, the unwinding mechanism 10 can move the electrode sheet to ensure that the unwinding offset is less than the unwinding set threshold. Based on the correction signal, the correction motor 52 drives the positioning sensor 51 to move in the correction direction corresponding to the correction signal, and the unwinding mechanism 10 follows the positioning sensor 51 to move in the required correction direction. In actual testing, the control accuracy of the unwinding and correction mechanism 50 can reach 0.05mm, which can effectively meet the requirements of fine correction.

[0056] In existing roller pressing equipment, the position of the positioning sensor 51 is fixed. The roller pressing equipment of this application embodiment drives the positioning sensor 51 to move in the direction corresponding to the correction signal by the correction motor 52 based on the correction signal. No other structure needs to be modified, which can effectively reduce the modification cost of the roller pressing equipment.

[0057] Specifically, there are various principles by which the correction sensor 41 acquires the offset of the electrode at the tensioning mechanism 20. In one embodiment of this application, the correction sensor 41 is a photoelectric correction sensor 41, which includes a light-emitting unit and a receiving unit. The light-emitting unit is configured to emit parallel light into a preset area at the tensioning mechanism 20, and the receiving unit is configured to receive the parallel light reflected by the electrode and output a corresponding photoelectric signal according to the light intensity of the parallel light reflected by the electrode. The light intensity is proportional to the reflection area of ​​the light emitted by the light-emitting unit on the electrode. The control unit 42 is configured to acquire the offset of the electrode at the tensioning mechanism 20 based on the photoelectric signal.

[0058] During the operation of the photoelectric correction sensor 41, the light-emitting unit emits parallel light to the preset area at the stretching mechanism 20, and the electrode reflects part of the parallel light to the receiving unit. The intensity of the reflected light is proportional to the reflection area of ​​the light emitted by the light-emitting unit on the electrode.

[0059] When the electrode shifts to either the left or right, the reflective area of ​​the electrode increases, and the reflected light intensity increases proportionally. Conversely, when the electrode shifts to the other side, the reflective area decreases, and the reflected light intensity decreases proportionally. Therefore, the receiving unit can receive the light reflected by the electrode and output a corresponding photoelectric signal based on the light intensity. The control unit 42 can calculate the offset direction and amount of the electrode at the tensioning mechanism 20 based on the intensity of the photoelectric signal. In actual testing, the detection accuracy of the correction sensor 41 can reach 0.01 mm, which well meets the detection requirements.

[0060] like Figure 1 As shown, this application also provides a correction device for a rolling mill, applied to a rolling mill, the rolling mill including an unwinding mechanism 10 and a stretching mechanism 20; the unwinding mechanism 10 is used to release the electrode sheet; the stretching mechanism 20 is disposed on the belt path of the electrode sheet and is configured to stretch the electrode sheet; the correction device includes a stretching correction detection mechanism 40 and an unwinding correction mechanism 50; the stretching correction detection mechanism 40 is configured to obtain the offset of the electrode sheet at the stretching mechanism 20, and if the offset is greater than a set threshold, send a correction signal to the unwinding correction mechanism 50 based on the offset; the unwinding correction mechanism 50 is configured to adjust the unwinding mechanism 10 based on the correction signal to move the electrode sheet in the correction direction corresponding to the correction signal, so that the offset of the electrode sheet at the stretching mechanism 20 is less than the set threshold.

[0061] In the operation of the rolling equipment in this embodiment, the unwinding mechanism 10 continuously releases the electrode sheet; the stretching mechanism 20 can stretch the electrode sheet passing through the stretching mechanism 20; the stretching correction detection mechanism 40 of the correction device can obtain the offset of the electrode sheet at the stretching mechanism 20 in real time, and when the offset is greater than a set threshold, it sends a correction signal to the unwinding correction mechanism 50 based on the offset; the unwinding correction mechanism 50 of the correction device can adjust the unwinding mechanism 10 to drive the electrode sheet to move in the correction direction corresponding to the correction signal based on the correction signal; after the electrode sheet is corrected, when the electrode sheet passes through the stretching mechanism 20, the offset will gradually decrease, so as to ensure that the offset of the electrode sheet at the stretching mechanism 20 is less than the set threshold.

[0062] Compared to existing rolling equipment, the rolling equipment in this application embodiment can ensure uniform stretching of the electrode tab portion by reducing the offset of the electrode at the stretching mechanism 20, which greatly reduces the probability of excessive electrode tab warping, thereby reducing safety hazards such as scrap sheets and electrode tab folding, and effectively improving the processing yield of battery electrode sheets.

[0063] The specific structure and working process of the correction device of the roller pressing equipment can be referred to the aforementioned roller pressing equipment, and will not be repeated here.

[0064] This application also provides a method for correcting the deviation of a rolling mill, which is applied to the rolling mill, which includes an unwinding mechanism 10 and a stretching mechanism 20; the unwinding mechanism 10 is used to release the electrode sheet; the stretching mechanism 20 is disposed on the belt path of the electrode sheet and is configured to stretch the electrode sheet. The correction method for this roller pressing equipment includes: Obtain the offset of the electrode at position 20 of the stretching mechanism; If the offset is greater than a set threshold, a correction signal is sent based on the offset. Based on the correction signal, the unwinding mechanism 10 is adjusted to move the electrode sheet in the correction direction corresponding to the correction signal, so that the offset of the electrode sheet at the stretching mechanism 20 is less than the set threshold.

[0065] That is, Figure 2 As shown, the correction method of this roller pressing equipment includes: Step S101: Obtain the offset of the electrode at position 20 of the stretching mechanism; Step S102: Determine whether the offset is greater than the set threshold. If yes, proceed to step S103; otherwise, return to step S101. Step S103: Send a correction signal based on the offset; Step S104: Based on the correction signal, adjust the unwinding mechanism 10 to drive the electrode sheet to move in the correction direction corresponding to the correction signal, so that the offset of the electrode sheet at the stretching mechanism 20 is less than the set threshold.

[0066] The correction method in the rolling mill of this application embodiment can reduce the offset of the electrode at the stretching mechanism 20 of the rolling mill, which can ensure that the tab portion of the electrode is stretched evenly, greatly reducing the probability of the tab warping exceeding the standard, thereby reducing safety hazards such as scrap sheets and tab folding, and effectively improving the processing yield of battery electrode sheets.

[0067] The specific execution process of the correction method of the roller pressing equipment can be referred to the aforementioned roller pressing equipment, and will not be repeated here.

[0068] Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A roller pressing device, characterized in that, The roller pressing equipment includes an unwinding mechanism (10), a stretching mechanism (20), a stretching correction and detection mechanism (40), and an unwinding correction mechanism (50). The unwinding mechanism (10) is used to release the electrode sheet; The stretching mechanism (20) is disposed on the conveying path of the electrode sheet, and the stretching mechanism (20) is configured to stretch the electrode sheet; The stretching correction detection mechanism (40) is configured to obtain the offset of the electrode at the stretching mechanism (20), and if the offset is greater than a set threshold, send a correction signal to the unwinding correction mechanism (50) based on the offset. The unwinding correction mechanism (50) is configured to adjust the unwinding mechanism (10) based on the correction signal to drive the electrode to move in the correction direction corresponding to the correction signal, so that the offset of the electrode at the stretching mechanism (20) is less than a set threshold. The stretching mechanism (20) includes a front stretching unit (22) and a rear stretching unit (21), and also includes a rolling mechanism (30). The rolling mechanism (30) is disposed on the belt path of the electrode sheet, and the rolling mechanism (30) is configured to roll the electrode sheet. The front stretching unit (22) is disposed in front of the rolling mechanism (30) on the belt path of the electrode sheet. The rear stretching unit (21) is disposed behind the rolling mechanism (30) on the belt path of the electrode sheet. The stretching correction detection mechanism (40) includes a front correction detection unit (412), which is located at the front stretching unit (22) and is configured to obtain the front offset of the electrode at the front stretching unit (22). If the front offset is greater than a second set threshold, a front correction signal is sent to the unwinding correction mechanism (50) based on the front offset. The stretching correction detection mechanism (40) includes a back correction detection unit (411), which is located at the back stretching unit (21) and is configured to obtain the back offset of the electrode at the back stretching unit (21). If the back offset is greater than a first set threshold, a back correction signal is sent to the unwinding correction mechanism (50) based on the back offset. The second set threshold is greater than the first set threshold.

2. The roller pressing equipment according to claim 1, characterized in that, The stretching correction detection mechanism (40) is configured to acquire a first offset amount of the electrode sheet in a first direction and a second offset amount in a second direction at the stretching mechanism (20), and send a first correction signal to the unwinding correction mechanism (50) based on the first offset amount when the first offset amount in the first direction is greater than a set threshold amount, and send a second correction signal to the unwinding correction mechanism (50) based on the offset amount when the second offset amount in the second direction is greater than a set threshold amount; The unwinding correction mechanism (50) is configured to adjust the unwinding mechanism (10) to move the electrode sheet in a second direction based on the first correction signal, so that the first offset of the electrode sheet at the stretching mechanism (20) is reduced to less than a set threshold, and to adjust the unwinding mechanism (10) to move the electrode sheet in a first direction based on the second correction signal, so that the second offset of the electrode sheet at the stretching mechanism (20) is reduced to less than a set threshold.

3. The roller pressing equipment according to claim 2, characterized in that, The stretching correction detection mechanism (40) is configured to send an alarm signal after the unwinding mechanism (10) moves the electrode sheet to a first direction or a second direction to an alarm preset threshold.

4. The roller pressing equipment according to claim 1, characterized in that, The unwinding correction mechanism (50) is configured to adjust the unwinding mechanism (10) based on the correction signal to move the electrode sheet a unit set distance in the correction direction corresponding to the correction signal, so that the offset of the electrode sheet at the stretching mechanism (20) is less than a set threshold.

5. The roller pressing equipment according to claim 1, characterized in that, The unwinding correction mechanism (50) is configured to adjust the unwinding mechanism (10) based on the correction signal to move the electrode sheet by the offset amount corresponding to the set distance in the correction direction corresponding to the correction signal, so that the offset amount of the electrode sheet at the stretching mechanism (20) is less than the set threshold.

6. The roller pressing equipment according to claim 1, characterized in that, The tension correction detection mechanism (40) includes a correction sensor (41) and a control unit (42). The correction sensor (41) is configured to acquire the offset of the electrode at the stretching mechanism (20), and the control unit (42) is configured to send a correction signal to the unwinding correction mechanism (50) based on the offset when the offset is greater than a set threshold, and to send a correction signal to the unwinding correction mechanism (50) only once within the motion cycle, wherein the motion cycle is greater than or equal to the time required for the electrode to move from the unwinding mechanism (10) to the stretching mechanism (20).

7. The roller pressing equipment according to claim 1, characterized in that, The tension correction detection mechanism (40) also includes a control unit (42). The control unit (42) is configured to send a back-correction signal to the unwinding correction mechanism (50) based on the back offset when the back offset is greater than a first set threshold, and to send the back-correction signal to the unwinding correction mechanism (50) only once in a first motion cycle, the first motion cycle being greater than or equal to the time required for the electrode to move from the unwinding mechanism (10) to the back-stretching unit (21).

8. The roller pressing equipment according to claim 7, characterized in that, The first set threshold is 0.3 mm.

9. The roller pressing equipment according to claim 1, characterized in that, The tension correction detection mechanism (40) also includes a control unit (42). The control unit (42) is configured to send a back offset signal to the unwinding correction mechanism (50) based on the back offset when the back offset is greater than a first set threshold, and to send a front offset signal to the unwinding correction mechanism (50) based on the front offset when the front offset is greater than a second set threshold, and to send a correction signal to the unwinding correction mechanism (50) only once in a first motion cycle after the back offset signal is sent, and to send a correction signal to the unwinding correction mechanism (50) only once in a second motion cycle after the front correction signal is sent, wherein the first motion cycle is greater than or equal to the time required for the electrode to move from the unwinding mechanism (10) to the back stretching unit (21), and the second motion cycle is greater than or equal to the time required for the electrode to move from the unwinding mechanism (10) to the front stretching unit (22).

10. The roller pressing equipment according to claim 9, characterized in that, The second set threshold is 0.5 mm.

11. The roller pressing equipment according to any one of claims 1 to 10, characterized in that, The unwinding correction mechanism (50) includes a positioning sensor (51) and a correction motor (52). The correction motor (52) is configured to drive the positioning sensor (51) to move in the correction direction corresponding to the correction signal based on the correction signal. The positioning sensor (51) is configured to obtain the unwinding offset of the electrode at the unwinding mechanism (10). The unwinding mechanism (10) is configured to move the electrode based on the unwinding offset, so that the unwinding offset is less than the unwinding set threshold.

12. The roller pressing equipment according to claim 6, characterized in that, The correction sensor (41) is a photoelectric correction sensor (41). The photoelectric correction sensor (41) includes a light-emitting unit and a receiving unit. The light-emitting unit is configured to emit parallel light to a preset area at the stretching mechanism (20). The receiving unit is configured to receive the parallel light reflected by the electrode and output a corresponding photoelectric signal according to the light intensity of the parallel light reflected by the electrode. The light intensity is proportional to the reflection area of ​​the parallel light emitted by the light-emitting unit on the electrode. The control unit (42) is configured to acquire the offset of the electrode at the stretching mechanism (20) based on the photoelectric signal.

13. A correction device for a roller pressing machine, characterized in that, It is applied to a rolling mill, which includes an unwinding mechanism (10) and a stretching mechanism (20). The unwinding mechanism (10) is used to release the electrode sheet; the stretching mechanism (20) is disposed on the conveying path of the electrode sheet, and the stretching mechanism (20) is configured to stretch the electrode sheet; The correction device includes a stretching correction detection mechanism (40) and an unwinding correction mechanism (50); the stretching correction detection mechanism (40) is configured to acquire the offset of the electrode at the stretching mechanism (20), and if the offset is greater than a set threshold, send a correction signal to the unwinding correction mechanism (50) based on the offset. The unwinding correction mechanism (50) is configured to adjust the unwinding mechanism (10) based on the correction signal to drive the electrode to move in the correction direction corresponding to the correction signal, so that the offset of the electrode at the stretching mechanism (20) is less than a set threshold. The stretching mechanism (20) includes a front stretching unit (22) and a rear stretching unit (21). The rolling equipment also includes a rolling mechanism (30), which is disposed on the belt path of the electrode sheet and configured to roll the electrode sheet. The front stretching unit (22) is disposed on the front side of the rolling mechanism (30) on the belt path of the electrode sheet. The rear stretching unit (21) is disposed on the rear side of the rolling mechanism (30) on the belt path of the electrode sheet. The stretching correction detection mechanism (40) includes a front correction detection unit (412), which is located at the front stretching unit (22) and is configured to obtain the front offset of the electrode at the front stretching unit (22). If the front offset is greater than a second set threshold, a front correction signal is sent to the unwinding correction mechanism (50) based on the front offset. The stretching correction detection mechanism (40) includes a back correction detection unit (411), which is located at the back stretching unit (21) and is configured to obtain the back offset of the electrode at the back stretching unit (21). If the back offset is greater than a first set threshold, a back correction signal is sent to the unwinding correction mechanism (50) based on the back offset. The second set threshold is greater than the first set threshold.

14. A method for correcting the deviation of a roller pressing device, characterized in that, The roll forming equipment according to any one of claims 1 to 12 or the correction device of the roll forming equipment according to claim 13 shall be used; The correction method includes: Obtain the offset of the electrode at the stretching mechanism (20); If the offset is greater than a set threshold, a correction signal is sent based on the offset. Based on the correction signal, the unwinding mechanism (10) is adjusted to move the electrode sheet in the correction direction corresponding to the correction signal, so that the offset of the electrode sheet at the stretching mechanism (20) is less than a set threshold.

Images