Pole piece deviation rectification control method and pole piece deviation rectification control system

Abstract

The invention relates to a pole piece deviation rectification control method and a pole piece deviation rectification control system. The pole piece deviation rectification control method comprises the following steps: winding a cathode piece, a diaphragm and an anode piece by using a winding machine; detecting the OH value between the large film width layer of the cathode plate and the anode plate by using a first visual detection module; and if the OH value detected by the first visual detection module is not within the preset range value, the cathode plate and / or the anode plate are / is corrected. Therefore, on one hand, the OH value between the large film width layer of the cathode plate and the anode plate is detected to be closer to the actual OH value between the cathode plate and the anode plate; and on the other hand, the interference of a small film width layer on the cathode plate on the detection value of the first visual detection module is eliminated, and the OH value detected by the first visual detection module is ensured to be more accurate, so that the correction of the cathode plate and the anode plate is more accurate, and the OH value precision of the battery cell formed by winding is ensured to meet the design requirement. And the product yield is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and specifically to a pole piece deviation correction control method and a pole piece deviation correction control system. Background Art

[0002] The battery cell is an important component of the battery and is generally produced by winding and stacking processes. In the winding process, multiple layers of material strips such as cathode sheets, diaphragms and anode sheets are wound by winding needles to finally form a battery cell. The function of the diaphragm is to separate the cathode sheet from the anode sheet to achieve the purpose of insulation and prevent the cathode sheet from contacting the anode sheet and short-circuiting. In order to ensure the safety of the battery cell, the width of the anode sheet is designed to be greater than the width of the cathode sheet, that is, both sides of the anode sheet in the width direction exceed the cathode sheet by a certain distance, which is called Overhang, or OH for short. If OH is too large, it will have an adverse effect on the increase in battery cell capacity; if OH is too small, it will increase the safety hazard of short circuit, so OH needs to be controlled within a certain range.

[0003] However, errors are caused by problems such as cutters and material strip tension in the coating, rolling, die-cutting and slitting processes in the electrode preparation process, resulting in errors in the width dimensions of the electrode (i.e., wavy material), and the battery cells formed by subsequent winding have OH value accuracy that does not meet the standards. Summary of the invention

[0004] Based on this, it is necessary to provide a pole piece correction control method and a pole piece correction control system that can improve OH accuracy in order to address the above problems.

[0005] A pole piece deviation correction control method comprises the following steps:

[0006] The cathode sheet, the separator and the anode sheet are wound by a winding machine; wherein the cathode sheet comprises a current collector and an active material layer coated on both sides of the current collector, and the wider of the two active material layers of the cathode sheet is a large film width layer, and the narrower is a small film width layer;

[0007] The OH value between the large film width layer of the cathode sheet and the anode sheet is detected by using the first visual inspection module;

[0008] If the OH value detected by the first visual inspection module is not within a preset range, the cathode sheet and / or the anode sheet is corrected.

[0009] In some embodiments, before the step of winding the cathode sheet, the separator and the anode sheet using a winding machine, the following steps are further included:

[0010] Die-cutting and slitting the initial cathode sheet strip to form cathode sheets;

[0011] Using the second visual inspection module to visually inspect the cathode sheet during the film cutting and slitting process to form the cathode sheet, and determining the position of the large film width layer on the cathode sheet according to the visual inspection result;

[0012] Rolling up the cathode sheet formed by die-cutting and slitting to form a cathode sheet roll;

[0013] Cathode sheet rolls are classified according to the position of the large film width layer on the cathode sheet and the winding direction of the cathode sheet rolls;

[0014] Select a corresponding type of cathode sheet roll and load it onto the winder so that the side of the cathode sheet unwound by the winder with a large film width layer faces the first visual inspection module.

[0015] In some embodiments, the two side surfaces of the cathode sheet are respectively the front side and the back side, the side of the cathode sheet with the pole ear in the width direction is the pole ear side, and the side without the pole ear is the non-pole ear side; the front and back sides of the cathode sheet are coated with a ceramic layer, and the ceramic layer is located between the pole ear and the active material layer;

[0016] The step of using the second visual inspection module to visually inspect the cathode sheet during the film cutting and slitting process of the cathode sheet formed specifically includes:

[0017] Using the second visual inspection module to inspect the width of the ceramic layer on the front side of the cathode sheet, and using the second visual inspection module to inspect the width of the ceramic layer on the back side of the cathode sheet;

[0018] Calculate the difference between the width of the ceramic layer on the front side of the cathode sheet and the width of the ceramic layer on the back side;

[0019] If the difference is less than 0, it is determined that the active material layer on the front side of the cathode sheet is a large film width layer;

[0020] If the difference is greater than 0, it is determined that the active material layer on the back side of the cathode sheet is a large film width layer.

[0021] In some embodiments, the step of sorting the cathode sheet rolls comprises:

[0022] In the cathode sheet roll, if the large film width layer of the cathode sheet is located on the back of the cathode sheet and is rolled up in a clockwise direction, the side of each turn of the cathode sheet in the cathode sheet roll having the large film width layer faces outward, and the cathode sheet roll is classified as a first type roll;

[0023] In the cathode sheet roll, if the large film width layer of the cathode sheet is located on the front side of the cathode sheet and is rolled up in a counterclockwise direction, the side of each turn of the cathode sheet in the cathode sheet roll having the large film width layer faces inward, and the cathode sheet roll is classified as a first type roll;

[0024] In the cathode sheet roll, if the large film width layer of the cathode sheet is located on the back of the cathode sheet and is rolled in a counterclockwise direction, the side of each turn of the cathode sheet in the cathode sheet roll having the large film width layer faces outward, and the cathode sheet roll is classified as a second type of roll;

[0025] In the cathode sheet roll, if the large film width layer of the cathode sheet is located on the front side of the cathode sheet and is rolled in a clockwise direction, the side of each circle of the cathode sheet in the cathode sheet roll with the large film width layer faces inward, and the cathode sheet roll is divided into the second type of roll.

[0026] In some embodiments, the winding machine is divided into a first type of winding machine and a second type of winding machine, the unwinding hanging shaft of the first type of winding machine is located on the left side of the winding needle, and the unwinding hanging shaft of the second type of winding machine is located on the right side of the winding needle, and the first type of winding machine and the second type of winding machine are both provided with the first visual inspection module, and the first visual inspection module is located on the side of the winding needle facing the unwinding hanging shaft;

[0027] The step of selecting a corresponding type of cathode sheet material to be loaded onto the winding machine specifically includes:

[0028] Loading the first type of material roll onto the unwinding hanging shaft of the first type of winding machine, so that the side of the cathode film with a large film width layer unwinding from the unwinding hanging shaft of the first type of winding machine faces the first visual inspection module;

[0029] The second type of material roll is loaded onto the unwinding hanging shaft of the second type of winder, so that the side of the cathode film unwinding and output by the unwinding hanging shaft of the second type of winder with the large film width layer faces the first visual inspection module.

[0030] In some embodiments, the side of the cathode sheet having the tab in the width direction is the tab side, and the side without the tab is the non-tab side;

[0031] If the OH value detected by the first visual inspection module is not within a preset range, the step of correcting the cathode sheet and / or the anode sheet specifically includes:

[0032] If the OH value A between the tab side of the cathode sheet and the anode sheet detected by the first visual inspection module 200 satisfies: or, Then the cathode sheet or the anode sheet is corrected; wherein a represents the width of the anode sheet, and b represents the width of the cathode sheet;

[0033] If the OH value B between the non-ear side of the cathode sheet and the anode sheet detected by the first visual inspection module satisfies: or, Then the cathode or anode sheet is corrected.

[0034] In some embodiments, the side of the cathode sheet having the tab in the width direction is the tab side, and the side without the tab is the non-tab side;

[0035] If the OH value detected by the first visual inspection module is not within a preset range, the step of correcting the cathode sheet and / or the anode sheet specifically includes:

[0036] If the OH values ​​A and B between the tab side and the non-tab side of the cathode sheet and the anode sheet respectively detected by the first visual inspection module meet the following conditions: or, Then the cathode sheet or the anode sheet is corrected; wherein, It means the average value of multiple A values ​​detected in the same circle of the winding cell. It represents the average value of multiple B values ​​detected within the same turn of winding to form a battery cell.

[0037] A pole piece deviation correction control system, comprising a first visual detection module, a winding control module and a deviation correction module, wherein the winding control module is communicatively connected with the first visual detection module and the deviation correction module;

[0038] The first visual inspection module is used to perform real-time detection of the OH value between the large film width layer of the cathode sheet and the anode sheet during the process of the winding machine winding the cathode sheet, the diaphragm and the anode sheet; the winding control module is used to receive the OH value detected by the first visual inspection module, and compare the received OH value with a preset range value;

[0039] The winding control module is further used to control the deviation correction module to correct the cathode sheet or the anode sheet when the received OH value is not within the preset range.

[0040] In some embodiments, the electrode deviation correction control system further includes a die-cutting and slitting control module and a second visual inspection module in communication with the die-cutting and slitting control module, wherein the second visual inspection module is used to visually inspect the cathode sheet during the process of film cutting and slitting the initial cathode sheet to form the cathode sheet, and determine the position of the large film width layer on the cathode sheet according to the visual inspection result; the die-cutting and slitting control module is used to obtain the position information of the large film width layer on the cathode sheet detected by the second visual inspection module and the winding rotation information of the cathode sheet material roll formed by winding the cathode sheet;

[0041] The die-cutting and slitting control module is also used to determine the type of the cathode sheet roll according to the position information and the winding rotation direction information.

[0042] In some embodiments, the second visual inspection module is used to detect the width of the ceramic layer on the front side of the cathode sheet and the width of the ceramic layer on the back side of the cathode sheet, and the die-cutting and slitting control module is used to calculate the difference between the width of the ceramic layer on the front side of the cathode sheet and the width of the ceramic layer on the back side;

[0043] The die-cutting and slitting control module is also used to determine that the active material layer on the front side of the cathode sheet is a large film width layer when the difference is less than 0, and to determine that the active material layer on the back side of the cathode sheet is a large film width layer when the difference is greater than 0.

[0044] In some embodiments, the die-cutting and slitting control module is further used to determine that the corresponding cathode sheet roll is a first-class roll when the received position information is that the large film width layer on the cathode sheet is located on the back of the cathode sheet and the winding rotation direction information is clockwise;

[0045] When the received position information is that the large film width layer on the cathode sheet is located on the front of the cathode sheet, and the winding rotation direction information is counterclockwise, the die-cutting and slitting control module determines that the corresponding cathode sheet roll is a first-class roll;

[0046] When the received position information is that the large film width layer on the cathode sheet is located on the back of the cathode sheet, and the winding rotation direction information is counterclockwise, the die-cutting and slitting control module determines that the corresponding cathode sheet roll is a second-type roll;

[0047] When the received position information is that the large film width layer on the cathode sheet is located on the front side of the cathode sheet and the winding rotation direction information is clockwise, the die-cutting and slitting control module determines that the corresponding cathode sheet roll is a second type roll.

[0048] In one embodiment, the winding machine is divided into a first type of winding machine and a second type of winding machine, the unwinding hanging shaft of the first type of winding machine is located on the left side of the winding needle, and the unwinding hanging shaft of the second type of winding machine is located on the right side of the winding needle, and the first type of winding mechanism and the second type of winding mechanism are both provided with the first visual inspection module, and the first visual inspection module is located on the side of the winding needle facing the unwinding hanging shaft;

[0049] The unwinding hanging shaft of the first type of winding machine is used to load the first type of material roll, so that the side of the cathode film with a large film width layer unwinding and output by the unwinding hanging shaft of the first type of winding machine faces the first visual inspection module;

[0050] The unwinding shaft of the second type of winder is used to load the second type of material roll, so that the side of the cathode film with a large film width layer unwinding and output by the unwinding shaft of the second type of winder faces the first visual inspection module.

[0051] The above-mentioned pole piece correction control method and pole piece correction control system use the first visual inspection module to always detect the OH value between the large film width layer of the cathode piece and the anode piece during the winding process. On the one hand, by detecting the OH value between the large film width layer of the cathode piece and the anode piece, it is closer to the actual OH value between the cathode piece and the anode piece; on the other hand, the interference of the small film width layer on the cathode piece on the detection value of the first visual inspection module is eliminated, ensuring that the OH value detected by the first visual inspection module is more accurate, thereby making the correction of the cathode piece and the anode piece more accurate, thereby ensuring that the OH value accuracy of the wound battery cell meets the design requirements, greatly improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a flow chart of the steps of a pole piece deviation correction control method in one embodiment of the present application;

[0053] Figure 2 for Figure 1 The step flow chart of step S10 in the pole piece deviation correction control method shown;

[0054] Figure 3 for Figure 1 The step flow chart of step S12 in the pole piece deviation correction control method shown;

[0055] Figure 4 This is a schematic diagram of the structure of the cathode sheet and the anode sheet in one embodiment of the present application (the side of the cathode sheet with the large film width layer faces away from the anode sheet);

[0056] Figure 5 This is a schematic diagram of the structure of the cathode sheet and the anode sheet in one embodiment of the present application (the side of the cathode sheet with the large film width layer faces the anode sheet);

[0057] Figure 6 is a cross-sectional view of a cathode sheet in one embodiment of the present application;

[0058] Figure 7 This is a schematic diagram of the structure of the first type of material roll in one embodiment of the present application (clockwise winding);

[0059] Figure 8 This is a schematic diagram of the structure of the first type of material roll in one embodiment of the present application (rolling in a counterclockwise direction);

[0060] Fig. 9 This is a schematic diagram of the structure of the second type of material roll in one embodiment of the present application (counterclockwise winding);

[0061] Fig.10 This is a schematic diagram of the structure of the second type of material roll in one embodiment of the present application (clockwise winding);

[0062] Fig.11 This is a schematic structural diagram of a first type of winding machine in an embodiment of the present application;

[0063] Fig.12 This is a structural schematic diagram of a first type of winding machine in another embodiment of the present application;

[0064] Fig.13 This is a schematic diagram of the structure of the second type of winding machine in one embodiment of the present application;

[0065] Fig.14 This is a schematic structural diagram of a second type of winding machine in another embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0067] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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 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 present application.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In this application, unless otherwise clearly specified and limited, the terms "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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0071] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0072] In the prior art, in the production process of the battery cell, the initial cathode sheet and the initial anode sheet are first die-cut and slit in sequence to form a cathode sheet and an anode sheet, and the cathode sheet formed by slitting is rolled up to form a cathode sheet roll, and the anode sheet formed by slitting is rolled up to form an anode sheet roll. Then, a winding machine is used to wind the cathode sheet, the diaphragm and the anode sheet to form a battery cell. During the winding process, it is necessary to perform real-time detection of the OH value between the cathode sheet and the anode sheet, and according to the detection result, the anode sheet or the cathode sheet is corrected (i.e., the position of the anode sheet or the cathode sheet in its width direction is adjusted) until the OH value between the cathode sheet and the anode sheet meets the process requirements.

[0073] However, in addition to the active material layer formed by coating the cathode slurry on both sides of the cathode sheet, there is also a ceramic layer formed by coating the ceramic slurry. The two sides of the cathode sheet in its width direction are respectively the ear side with the ear and the non-ear side without the ear. Since the ceramic layers on the two side surfaces of the cathode sheet are located on the ear side of the cathode sheet, there is usually a certain amount of misalignment of the active material layers on the two side surfaces of the cathode sheet on the ear side. The existence of this misalignment makes the detected OH value between the cathode sheet and the anode sheet inaccurate, and then makes the correction of the cathode sheet or the anode sheet inaccurate, which ultimately leads to the situation that the accuracy of the OH value of the wound battery cell does not meet the standard. In order to improve the problem of the above-mentioned battery cell OH value accuracy not meeting the standard, it is necessary to provide a pole piece correction control method and a pole piece correction control system for improving the accuracy of the battery cell OH value.

[0074] See also Figure 1 and Fig.11 , the present application provides a pole piece deviation correction control method, comprising the following steps:

[0075] S20, using a winding machine to wind the cathode sheet 10, the separator and the anode sheet 20. The cathode sheet 10 includes a current collector and an active material layer coated on two opposite sides of the current collector. The wider of the two active material layers of the cathode sheet 10 is the large film width layer 11, and the narrower is the small film width layer.

[0076] S30 , using the first visual inspection module 200 to inspect the OH value between the large film width layer 11 of the cathode sheet 10 and the cathode sheet 10 .

[0077] S40, if the OH value detected by the first visual inspection module 200 is not within the preset range, the cathode sheet 10 and / or the anode sheet 20 is corrected;

[0078] If the OH value detected by the first visual inspection module 200 is within the preset range, no deviation correction is performed on the cathode sheet 10 and the anode sheet 20 .

[0079] The above-mentioned electrode correction control method uses the first visual inspection module 200 to always detect the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20 during the winding process. On the one hand, by detecting the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20, it is closer to the actual OH value between the cathode sheet 10 and the anode sheet 20; on the other hand, the interference of the small film width layer on the cathode sheet 10 on the detection value of the first visual inspection module 200 is eliminated, ensuring that the OH value detected by the first visual inspection module 200 is more accurate, thereby making the correction of the cathode sheet 10 and the anode sheet 20 more accurate, thereby ensuring that the OH value accuracy of the wound battery cell meets the design requirements, thereby greatly improving the product yield.

[0080] It should be noted that after the battery cell is wound, it is necessary to use an X-ray detector to detect the OH value of the battery cell. Since the X-ray detector can only detect the large film width layer 11 of the cathode sheet 10, the first visual inspection module 200 always detects the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20 during the winding process, so that the standards of the two tests are consistent, avoiding the increase in the detection data difference due to inconsistent standards of the two tests, which is beneficial to further improve the accuracy of the battery cell OH value.

[0081] Please also see Figure 2 In the embodiment of the present application, a film-making step S10 is included before step S20, and the film-making step S10 specifically includes the following steps:

[0082] S11, die-cut and slit the initial cathode sheet to form cathode sheets 10. Specifically, the initial cathode sheet is unwound and output by an unwinding mechanism, and first, the unwound initial cathode sheet is die-cut to form structures such as tabs on the initial cathode sheet; then, the initial cathode sheet is slit to form at least two cathode sheets 10.

[0083] S12, using the second visual inspection module to perform visual inspection on the cathode sheet 10 during the process of die-cutting and slitting to form the cathode sheet 10, and determining the position of the large film width layer 11 on the cathode sheet 10 according to the visual inspection result, that is, determining on which side of the cathode sheet 10 the large film width layer 11 is located, so as to accurately find and inspect the large film width layer 11 of the cathode sheet 10 in the future;

[0084] S13, rolling up at least two cathode sheets 10 formed by die-cutting and slitting to form a cathode sheet roll;

[0085] S14, classifying the cathode sheet rolls according to the position of the large film width layer 11 on the cathode sheet 10 and the winding direction of the cathode sheet rolls;

[0086] S15. Select the corresponding type of cathode sheet material roll and load it onto the winding machine, so that the cathode sheet 10 unrolled by the winding machine has the side with the large film width layer 11 facing the first visual inspection module 200, thereby ensuring that the first visual inspection module 200 always detects the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20.

[0087] In this way, in the process of die-cutting and slitting the initial cathode sheet strip to form the cathode sheet 10, the second visual inspection module is used to perform visual inspection on the cathode sheet 10 to determine the positions of the large film width layer 11 and the small film width layer on the cathode sheet 10, and then the cathode sheet roll is classified according to the inspection result and the winding direction of the cathode sheet roll, and then the corresponding type of cathode sheet roll is selected to be loaded onto the winding machine for winding, ensuring that the side of the cathode sheet 10 with the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 always detects the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20.

[0088] Please note that, see Figure 6 The two side surfaces of the cathode sheet 10 are respectively the front side and the back side. The side of the cathode sheet 10 with the pole ear in the width direction is the pole ear side, and the side without the pole ear is the non-pole ear side. The front and back sides of the cathode sheet 10 are coated with a ceramic layer 12, which is located between the pole ear and the active material layer. The ceramic layer 12 can prevent the cathode sheet 10 from short-circuiting with the anode sheet 20 and support the pole ear.

[0089] Furthermore, the above step S12 specifically includes the following steps:

[0090] S120, using the second visual inspection module to inspect the width of the ceramic layer 12 on the front side of the cathode sheet 10, and using the second visual inspection module to inspect the width of the ceramic layer 12 on the back side of the cathode sheet 10;

[0091] S121, calculating the difference between the width of the ceramic layer 12 on the front side of the cathode sheet 10 and the width of the ceramic layer 12 on the back side;

[0092] If the difference is less than 0, it is determined that the active material layer on the front side of the cathode sheet 10 is the large film width layer 11; if the difference is greater than 0, it is determined that the active material layer on the back side of the cathode sheet 10 is the large film width layer 11. In this way, if the width dimension of the ceramic layer 12 on the front side of the cathode sheet 10 is greater than the width dimension of the ceramic layer 12 on the back side (that is, the above difference is greater than 0), it indicates that the width dimension of the active material layer on the front side of the cathode sheet 10 is smaller than the width dimension of the active material layer on the back side, that is, the large film width layer 11 is located on the back side of the cathode sheet 10. Conversely, if the width dimension of the ceramic layer 12 on the front side of the cathode sheet 10 is smaller than the width dimension of the ceramic layer 12 on the back side (that is, the above difference is less than 0), it indicates that the width dimension of the active material layer on the front side of the cathode sheet 10 is greater than the width dimension of the active material layer on the back side, that is, the large film width layer 11 is located on the front side of the cathode sheet 10.

[0093] Furthermore, the above step S14 specifically includes:

[0094] See also Figure 7 In the cathode sheet material roll, if the large film width layer 11 of the cathode sheet 10 is located on the back of the cathode sheet 10 and is rolled in a clockwise direction, then each circle of the cathode sheet 10 in the cathode material roll has one side of the large film width layer 11 facing outward, and the cathode sheet material roll is divided into the first category 30a.

[0095] See also Figure 8 In the cathode sheet roll, if the large film width layer 11 of the cathode sheet 10 is located on the front side of the cathode sheet 10 and is rolled in a counterclockwise direction, then each circle of the cathode sheet 10 in the cathode sheet roll has one side of the large film width layer 11 facing inward, and the cathode sheet roll is divided into a first type roll 30a.

[0096] See also Fig. 9 In the cathode sheet roll, if the large film width layer 11 of the cathode sheet 10 is located on the back of the cathode sheet 10 and is rolled in a counterclockwise direction, then the side of the cathode sheet 10 with the large film width layer 11 in each circle of the cathode sheet roll faces outward, and the cathode sheet roll is divided into the second type roll 30b.

[0097] See also Fig.10 In the cathode sheet roll, if the large film width layer 11 of the cathode sheet 10 is located on the front side of the cathode sheet 10 and is rolled in a clockwise direction, then each circle of the cathode sheet 10 in the cathode sheet roll has one side with the large film width layer 11 facing inward, and the cathode sheet roll is divided into the second type roll 30b.

[0098] Furthermore, the type of each cathode sheet roll can be marked with a shipping plate, and the cathode sheet roll can be loaded onto the corresponding winding machine according to the mark on the shipping plate. The cathode sheet roll can be automatically loaded by a loading device, semi-automatically loaded by a loading device in cooperation with manual labor, or manually loaded by a worker, as long as different types of cathode sheets 10 can be loaded onto the corresponding winding machine, and this is not limited here.

[0099] It should be noted that the winding machine is divided into a first type of winding machine 1a and a second type of winding machine 1b. The unwinding hanging shaft 300 of the first type of winding machine 1a is located on the left side of the winding needle 100, and is used to load the cathode sheet roll, and drive the cathode sheet roll to rotate clockwise or counterclockwise, so as to unwind and output the cathode sheet 10 to the winding needle 100. The unwinding hanging shaft 300 of the second type of winding machine 1b is located on the right side of the winding needle 100, and is used to load the cathode sheet roll, and drive the cathode sheet roll to rotate clockwise or counterclockwise, so as to unwind and output the cathode sheet 10 to the winding needle 100. The first type of winding machine 1a and the second type of winding machine 1b are both provided with a first visual inspection module 200, and the first visual inspection module 200 is located on the side of the winding needle 100 facing the unwinding hanging shaft 300, and is used to detect the large film width layer 11 of the cathode sheet 10 and the anode sheet 20 to obtain the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20.

[0100] Specifically in the embodiment, the above step S15 specifically includes:

[0101] The first type of material roll 30a is loaded onto the unwinding hanging shaft 300 of the first type of winding machine 1a, so that the cathode film 10 unwound and output by the unwinding hanging shaft 300 of the first type of winding machine 1a has the side with the large film width layer 11 facing the first visual inspection module 200, thereby ensuring that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20.

[0102] The second type of material roll 30b is loaded onto the unwinding hanging shaft 300 of the second type of winding machine 1b, so that the cathode film 10 unwound and output by the unwinding hanging shaft 300 of the second type of winding machine 1b has the side with the large film width layer 11 facing the first visual inspection module 200, thereby ensuring that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20.

[0103] It should be noted that the first type winding machine 1a is provided with two unwinding hanging shafts 300 on the left side of the winding needle 100, and the first type material roll 30a wound clockwise and the first type material roll 30a wound counterclockwise can be loaded onto the two unwinding hanging shafts 300 of the first type winding machine 1a. Fig.11 As shown, the clockwise wound first-class material roll 30a is loaded onto the left unwinding hanging shaft 300 of the first-class winding machine 1a, and the left unwinding hanging shaft 300 drives the clockwise wound first-class material roll 30a thereon to rotate counterclockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, and the side of the cathode film 10 with the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20. Fig.11 As shown, the counterclockwise wound first-class material roll 30a is loaded onto the right unwinding hanging shaft 300 of the first-class winding machine 1a, and the right unwinding hanging shaft 300 drives the counterclockwise wound first-class material roll 30b thereon to rotate clockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, and the side of the cathode film 10 having the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20.

[0104] See Fig.12As shown, the clockwise wound first-class material roll 30a can also be loaded onto the right unwinding hanging shaft 300 of the first-class winding machine 1a, and the right unwinding hanging shaft 300 drives the clockwise wound first-class material roll 30a thereon to rotate counterclockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, and the side of the cathode film 10 having the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20. Fig.12 As shown, the counterclockwise wound first-class material roll 30a can also be loaded onto the left unwinding hanging shaft 300 of the first-class winding machine 1a, and the left unwinding hanging shaft 300 drives the counterclockwise wound first-class material roll 30a thereon to rotate clockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, and the side of the cathode film 10 having the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20.

[0105] It should also be noted that the second type winding machine 1b is provided with two unwinding hanging shafts 300 on the right side of the winding needle 100, and the second type material roll 30b wound counterclockwise and the second type material roll 30b wound clockwise can be loaded onto the two unwinding hanging shafts 300 of the second type winding machine 1b. Fig.13 As shown, the clockwise wound second-type material roll 30b is loaded onto the left unwinding hanging shaft 300 of the second-type winding machine 1b, and the left unwinding hanging shaft 300 drives the clockwise wound second-type material roll 30b thereon to rotate counterclockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, wherein the side of the cathode film 10 having the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20. Fig.13 As shown, the counterclockwise wound second-type material roll 30b is loaded onto the right unwinding hanging shaft 300 of the second-type winding machine 1b, and the right unwinding hanging shaft 300 drives the counterclockwise wound second-type material roll 30b thereon to rotate clockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, and the side of the cathode film 10 having the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20.

[0106] See Fig.14As shown, the clockwise wound second-type material roll 30b can also be loaded onto the right unwinding hanging shaft 300 of the second-type winding machine 1b, and the right unwinding hanging shaft 300 drives the clockwise wound second-type material roll 30b thereon to rotate counterclockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, and the side of the cathode film 10 having the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20. Fig.14 As shown, the counterclockwise wound second-type material roll 30b can also be loaded onto the left unwinding hanging shaft 300 of the second-type winding machine 1b, and the left unwinding hanging shaft 300 drives the counterclockwise wound second-type material roll 30b thereon to rotate clockwise, thereby unwinding and outputting the cathode film 10 to the winding needle 100, and the side of the cathode film 10 having the large film width layer 11 faces the first visual inspection module 200, so that the first visual inspection module 200 can always detect the OH value between the large film width layer 11 of the cathode film 10 and the anode film 20.

[0107] In some embodiments, step S40 specifically includes:

[0108] If the first visual inspection module 200 detects that the OH value A between the tab side of the cathode sheet 10 and the anode sheet 20 satisfies: or, Then the cathode sheet 10 or the anode sheet 20 is corrected. Wherein, a represents the width of the anode sheet 20, and b represents the width of the cathode sheet 10. That is, if This indicates that in each circle of the battery cell, the difference between the maximum OH value and the minimum OH value of the tab side of the cathode sheet 10 and the anode sheet 20 is ≤0.4 (i.e., the unilateral range control line of the tab side is ≤0.4), and at this time, the cathode sheet 10 and the anode sheet 20 do not need to be corrected;

[0109] If the first visual inspection module 200 detects that the OH value B of the non-tab side of the cathode sheet 10 and the anode sheet 20 satisfies: or, Then the cathode sheet 10 or the anode sheet 20 is corrected. This indicates that in each circle of the battery cell, the difference between the maximum OH value and the minimum OH value of the non-ear side of the cathode sheet 10 and the anode sheet 20 is ≤0.4 (i.e., the unilateral extreme difference control line on the non-ear side is ≤0.4). At this time, the cathode sheet 10 and the anode sheet 20 do not need to be corrected.

[0110] It should be noted that the method of controlling the single-sided extreme difference control line is not limited to judging whether deviation correction is needed. In other embodiments, the method of controlling the double-sided mean difference control line can also be used to judge whether deviation correction is needed.

[0111] In an embodiment in which a bilateral mean difference control line is used to determine whether deviation correction is required, step S40 specifically includes:

[0112] If the tab side and non-tab side of the cathode sheet 10 detected by the first visual inspection module 200 respectively satisfy the OH values ​​A and B of the anode sheet 20: or, Then the cathode sheet 10 or the anode sheet 20 is corrected; wherein, It represents the average value of multiple A values ​​detected in the same circle of the winding cell. It represents the average value of multiple B values ​​detected in the same circle of winding to form a battery cell. This indicates that in each circle of the battery cell, the difference between the average OH value between the tab side of the cathode sheet 10 and the anode sheet 20 and the average OH value between the non-tab side and the anode sheet 20 is ≤0.2 (i.e., the double-sided mean difference control line is ≤0.2). At this time, the cathode sheet 10 and the anode sheet 20 do not need to be corrected.

[0113] It should be noted that, optionally, the step of correcting the cathode sheet 10 or the anode sheet 20 specifically includes: if the first visual inspection module 200 detects that the distance between the anode sheet 20 and the diaphragm is greater than or equal to a preset value, adjusting the position of the anode sheet 20 relative to the diaphragm; if the first visual inspection module 200 detects that the distance between the anode and the diaphragm is less than a preset value, adjusting the position of the cathode sheet 10 relative to the diaphragm.

[0114] Based on the above-mentioned pole piece deviation correction control method, this application also provides a pole piece deviation correction control system. Figures 4 to 6 , the electrode correction control system includes a first visual inspection module 200, a winding control module and a correction module. The winding control module is communicatively connected with the first visual inspection module 200 and the correction module. The first visual inspection module 200 is used to perform real-time detection of the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20 during the process of the winding machine winding the cathode sheet 10, the diaphragm and the anode sheet 20. The winding control module is used to receive the OH value detected by the first visual inspection module 200, and compare the received OH value with a preset range value. The winding control module is also used to control the correction module to correct the cathode sheet 10 or the anode sheet 20 when the received OH value is not within the preset range value, until the OH value detected by the first visual inspection module 200 is within the preset range value.

[0115] Optionally, the winding control module is used to control the deviation correction of the cathode sheet 10 and / or the anode sheet 20 by using the above-mentioned single-side range control line. Specifically, the first visual inspection module 200 transmits the detected OH value between the tab side of the cathode sheet 10 and the anode sheet 20 to the winding control module, and the winding control module compares the received OH value A with the and For comparison, if or, The winding control module sends a correction signal to the correction module, and the correction module corrects the cathode sheet 10 and / or the anode sheet 20 according to the correction signal. The winding control module sends a stop correction signal to the correction module, and the correction module stops correcting the cathode sheet 10 and the anode sheet 20 according to the stop correction signal.

[0116] The first visual inspection module 200 also transmits the detected OH value between the non-ear side of the cathode sheet 10 and the anode sheet 20 to the winding control module, and the winding control module compares the received OH value B between the non-ear side of the cathode sheet 10 and the anode sheet 20 with the and For comparison, if or, The winding control module sends a correction signal to the correction module, and the correction module corrects the cathode sheet 10 and / or the anode sheet 20 according to the correction signal. The winding control module sends a stop correction signal to the correction module, and the correction module stops correcting the cathode sheet 10 and the anode sheet 20 according to the stop correction signal.

[0117] It should be noted that the method of controlling the single-sided extreme difference control line is not limited to judging whether deviation correction is needed. In other embodiments, the method of controlling the double-sided mean difference control line can also be used to judge whether deviation correction is needed.

[0118] In the embodiment of using the double-sided average difference control line to determine whether correction is required, the first visual inspection module 200 transmits the OH values ​​A and B between the pole ear side and the non-pole ear side of the cathode sheet 10 and the anode sheet 20 respectively to the winding control module, and the winding control module calculates the average value based on multiple A values ​​detected in the same circle of the winding cell. The average value is also calculated based on multiple B values ​​detected in the same circle of the winding cell. Then calculate the average value With the average If the difference or, The winding control module sends a correction signal to the correction module, and the correction module corrects the cathode sheet 10 and / or the anode sheet 20 according to the correction signal. The winding control module sends a stop correction signal to the correction module, and the correction module stops correcting the cathode sheet 10 and the anode sheet 20 according to the stop correction signal.

[0119] Please continue to see Figures 4 to 6 Specifically, in the embodiment, the electrode deviation correction control system also includes a die-cutting and slitting control module and a second visual inspection module that is communicatively connected to the die-cutting and slitting control module. The second visual inspection module is used to visually inspect the cathode sheet 10 during the process of die-cutting and slitting the initial cathode sheet to form the cathode sheet 10, and determine the position of the large film width layer 11 on the cathode sheet 10 according to the visual inspection result, that is, determine whether the large film width layer 11 on the cathode sheet 10 is located on the front or back of the cathode sheet 10. The die-cutting and slitting control module is used to obtain the position information of the large film width layer 11 on the cathode sheet 10 detected by the second visual inspection module and the winding rotation information of the cathode sheet roll formed by winding the cathode sheet 10. The die-cutting and slitting control module is also used to determine the type of the cathode sheet roll according to the position information and the winding rotation information, so as to facilitate the subsequent feeding to the corresponding winding machine according to the type of the cathode sheet roll, and ensure that the first visual inspection module 200 can detect the OH value between the large film width layer 11 of the cathode sheet 10 and the anode sheet 20.

[0120] Further, the second visual inspection module is used to detect the width dimension of the ceramic layer 12 on the front side of the cathode sheet 10 and the width dimension of the ceramic layer 12 on the back side of the cathode sheet 10. The die-cutting and slitting control module is used to calculate the difference between the width dimension of the ceramic layer 12 on the front side of the cathode sheet 10 and the width dimension of the ceramic layer 12 on the back side, and to determine that the active material layer on the front side of the cathode sheet 1 is the large film width layer 11 when the difference is less than 0, and to determine that the active material layer on the back side of the cathode sheet 10 is the large film width layer 11 when the difference is greater than 0.

[0121] Optionally, the second visual inspection module includes a die-cutting visual inspection module and a slitting visual inspection module. The die-cutting visual inspection module is used to perform visual inspection on the front side of the initial cathode sheet (i.e., the front side of the cathode sheet 10 formed subsequently) when the initial cathode sheet is die-cut, so as to determine the width dimension of the ceramic layer 12 on the front side of the initial cathode sheet. The slitting visual inspection module is used to perform visual inspection on the back side of the cathode sheet 10 when the initial cathode sheet is slit to form the cathode sheet 10, so as to determine the width dimension of the ceramic layer 12 on the back side of the cathode sheet 10. The die-cutting and slitting control module receives the inspection data of the die-cutting visual inspection module and the slitting visual inspection module, and calculates the difference between the width dimension of the ceramic layer 12 on the front side of the cathode sheet 10 and the width dimension of the ceramic layer 12 on the back side, and determines the position of the large film width layer 11 on the cathode sheet 10 based on the difference.

[0122] Furthermore, the die-cutting and slitting control module is also used to determine that the corresponding cathode sheet roll is a first type roll 30a, in which each turn of the cathode sheet 10 has a side with the large film width layer 11 facing outward (see Figure 7 ).

[0123] When the die-cutting and slitting control module receives the position information that the large film width layer 11 on the cathode sheet 10 is located on the front of the cathode sheet 10 and the winding rotation direction information is counterclockwise, it determines that the corresponding cathode sheet roll is a first type roll 30a, in which each turn of the cathode sheet 10 has a side with the large film width layer 11 facing inward (see Figure 8 );

[0124] When the received position information indicates that the large film width layer 11 on the cathode sheet 10 is located on the back of the cathode sheet 10 and the winding rotation direction information is counterclockwise, the die-cutting and slitting control module determines that the corresponding cathode sheet roll is a second type roll 30b, in which the side of each circle of the cathode sheet 10 having the large film width layer 11 faces outward;

[0125] When the die-cutting and slitting control module receives the position information that the large film width layer 11 on the cathode film 10 is located on the front side of the cathode film 10 and the winding rotation direction information is clockwise, it determines that the cathode film roll is a second type of roll 30b, in which each circle of the cathode film 10 has one side of the large film width layer 11 facing inward.

[0126] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0127] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A pole piece deviation correction control method, characterized in that: The following steps are involved: The cathode sheet (10), the separator and the anode sheet (20) are wound up using a winding machine; wherein the cathode sheet (10) comprises a current collector and an active material layer coated on both sides of the current collector, and the wider of the two active material layers of the cathode sheet (10) is a large film width layer (11), and the narrower is a small film width layer; Using a first visual inspection module (200) to inspect the OH value between the large film width layer (11) of the cathode sheet (10) and the anode sheet (20); If the OH value detected by the first visual inspection module (200) is not within a preset range, the cathode sheet (10) and / or the anode sheet (20) are corrected.

2. The pole piece deviation correction control method according to claim 1, characterized in that: Before the step of using a winding machine to wind the cathode sheet (10), the separator and the anode sheet (20), the method further comprises: Die-cutting and slitting the initial cathode sheet strip to form cathode sheets (10); Using a second visual inspection module to perform visual inspection on the cathode sheet (10) during the process of film cutting and slitting to form the cathode sheet (10), and determining the position of the large film width layer (11) on the cathode sheet (10) based on the visual inspection result; Rolling up the cathode sheet (10) formed by die-cutting and slitting to form a cathode sheet roll; Classifying the cathode sheet rolls according to the position of the large film width layer (11) on the cathode sheet (10) and the winding direction of the cathode sheet rolls; A corresponding type of cathode sheet material roll is selected and loaded onto the winding machine, so that the cathode sheet (10) unwound by the winding machine has a side with a large film width layer (11) facing the first visual inspection module (200).

3. The pole piece deviation correction control method according to claim 2, characterized in that: The two side surfaces of the cathode sheet (10) are respectively the front side and the back side; the side of the cathode sheet (10) having a pole ear in the width direction is the pole ear side, and the side without a pole ear is the non-pole ear side; the front side and the back side of the cathode sheet (10) are coated with a ceramic layer (12), and the ceramic layer (12) is located between the pole ear and the active material layer; The step of using the second visual inspection module to visually inspect the cathode sheet (10) during the process of film cutting and slitting the cathode sheet (10) specifically includes: Using a second visual inspection module to inspect the width of the ceramic layer (12) on the front side of the cathode sheet (10), and using a second visual inspection module to inspect the width of the ceramic layer (12) on the back side of the cathode sheet (10); Calculating the difference between the width of the ceramic layer (12) on the front side of the cathode sheet (10) and the width of the ceramic layer (12) on the back side; If the difference is less than 0, it is determined that the active material layer on the front side of the cathode sheet (10) is a large film width layer (11); If the difference is greater than 0, it is determined that the active material layer on the back side of the cathode sheet (10) is a large film width layer (11).

4. The pole piece deviation correction control method according to claim 3, characterized in that: The step of classifying the cathode sheet rolls comprises: In a cathode sheet roll, if the large film width layer (11) of the cathode sheet (10) is located on the back of the cathode sheet (10) and is rolled up in a clockwise direction, then the side of each turn of the cathode sheet (10) having the large film width layer (11) faces outward, and the cathode sheet roll is classified as a first type roll (30a); In a cathode sheet roll, if the large film width layer (11) of the cathode sheet (10) is located on the front side of the cathode sheet (10) and is rolled in a counterclockwise direction, then the cathode sheet roll is classified as a first type roll (30a) with one side of the large film width layer (11) of each turn of the cathode sheet (10) facing inward; In a cathode sheet roll, if the large film width layer (11) of the cathode sheet (10) is located on the back of the cathode sheet (10) and is rolled in a counterclockwise direction, then the side of each turn of the cathode sheet (10) having the large film width layer (11) faces outward, and the cathode sheet roll is classified as a second type roll (30b); In a cathode sheet roll, if the large film width layer (11) of the cathode sheet (10) is located on the front side of the cathode sheet (10) and is rolled in a clockwise direction, then each turn of the cathode sheet (10) in the cathode sheet roll has one side of the large film width layer (11) facing inward, and the cathode sheet roll is classified as a second type of roll (30b).

5. The pole piece deviation correction control method according to claim 4, characterized in that: The winding machine is divided into a first type of winding machine (1a) and a second type of winding machine (1b); the unwinding hanging shaft (300) of the first type of winding machine (1a) is located on the left side of the winding needle (100), and the unwinding hanging shaft (300) of the second type of winding machine (1b) is located on the right side of the winding needle (100); the first type of winding machine (1a) and the second type of winding machine (1b) are both provided with the first visual inspection module (200), and the first visual inspection module (200) is located on the side of the winding needle (100) facing the unwinding hanging shaft (300); The step of selecting a corresponding type of cathode sheet material to be loaded onto the winding machine specifically includes: Loading the first type of material roll (30a) onto the unwinding hanging shaft (300) of the first type of winding machine (1a), so that the side of the cathode film (10) unwound and outputted by the unwinding hanging shaft (300) of the first type of winding machine (1a) with the large film width layer (11) faces the first visual inspection module (200); The second type of material roll (30b) is loaded onto the unwinding hanging shaft (300) of the second type of winding machine (1b), so that the cathode film (10) unwound and outputted by the unwinding hanging shaft (300) of the second type of winding machine (1b) has a side with a large film width layer (11) facing the first visual inspection module (200).

6. The pole piece deviation correction control method according to claim 1, characterized in that: The side of the cathode sheet (10) having a pole ear in the width direction is the pole ear side, and the side without a pole ear is the non-pole ear side; If the OH value detected by the first visual inspection module (200) is not within a preset range, the step of correcting the cathode sheet (10) and / or the anode sheet (20) specifically includes: If the OH value A between the tab side of the cathode sheet (10) and the anode sheet (20) detected by the first visual inspection module (200) satisfies: or, Then the cathode sheet (10) or the anode sheet (20) is corrected; wherein a represents the width of the anode sheet (20), and b represents the width of the cathode sheet (10); If the OH value B between the non-ear side of the cathode sheet (10) and the anode sheet (20) detected by the first visual inspection module (200) satisfies: or, Then the cathode sheet (10) or the anode sheet (20) is corrected.

7. The pole piece deviation correction control method according to claim 1, characterized in that: The side of the cathode sheet (10) having a pole ear in the width direction is the pole ear side, and the side without a pole ear is the non-pole ear side; If the OH value detected by the first visual inspection module (200) is not within a preset range, the step of correcting the cathode sheet (10) and / or the anode sheet (20) specifically includes: If the OH values ​​A and B between the tab side and the non-tab side of the cathode sheet (10) and the anode sheet (20) respectively detected by the first visual inspection module (200) satisfy: or, Then the cathode sheet (10) or the anode sheet (20) is corrected; wherein, It means the average value of multiple A values ​​detected in the same circle of the winding cell. It represents the average value of multiple B values ​​detected within the same turn of winding to form a battery cell.

8. A pole piece deviation correction control system, characterized in that: It comprises a first visual inspection module (200), a winding control module and a deviation correction module, wherein the winding control module is communicatively connected with the first visual inspection module (200) and the deviation correction module; The first visual inspection module (200) is used to perform real-time detection of the OH value between the large film width layer (11) of the cathode sheet (10) and the anode sheet (20) during the process of the winding machine winding the cathode sheet (10), the diaphragm and the anode sheet (20); the winding control module is used to receive the OH value detected by the first visual inspection module (200), and compare the received OH value with a preset range value; The winding control module is also used to control the deviation correction module to correct the cathode sheet (10) or the anode sheet (20) when the received OH value is not within the preset range.

9. The pole piece deviation correction control system according to claim 8, characterized in that: The electrode deviation correction control system further comprises a die-cutting and slitting control module and a second visual inspection module communicatively connected to the die-cutting and slitting control module, wherein the second visual inspection module is used to visually inspect the cathode sheet (10) during the process of film cutting and slitting the initial cathode sheet to form the cathode sheet (10), and to determine the position of the large film width layer (11) on the cathode sheet (10) according to the visual inspection result; the die-cutting and slitting control module is used to obtain the position information of the large film width layer (11) on the cathode sheet (10) detected by the second visual inspection module and the winding rotation information of the cathode sheet material roll formed by winding the cathode sheet (10); The die-cutting and slitting control module is also used to determine the type of the cathode sheet roll according to the position information and the winding rotation direction information.

10. The pole piece deviation correction control system according to claim 9, characterized in that: The second visual inspection module is used to detect the width of the ceramic layer (12) on the front side of the cathode sheet (10) and the width of the ceramic layer (12) on the back side of the cathode sheet (10), and the die-cutting and slitting control module is used to calculate the difference between the width of the ceramic layer (12) on the front side of the cathode sheet (10) and the width of the ceramic layer (12) on the back side; The die-cutting and slitting control module is also used to determine that the active material layer on the front side of the cathode sheet (10) is a large film width layer (11) when the difference is less than 0, and to determine that the active material layer on the back side of the cathode sheet (10) is a large film width layer (11) when the difference is greater than 0.

11. The pole piece deviation correction control system according to claim 10, characterized in that: The die-cutting and slitting control module is also used to determine that the corresponding cathode sheet roll is a first-type roll (30a) when the received position information is that the large film width layer (11) on the cathode sheet (10) is located on the back of the cathode sheet (10), and the winding rotation direction information is clockwise; When the received position information is that the large film width layer (11) on the cathode sheet (10) is located on the front side of the cathode sheet (10), and the winding rotation direction information is counterclockwise, the die-cutting and slitting control module determines that the corresponding cathode sheet roll is a first-type roll (30a); When the received position information is that the large film width layer (11) on the cathode sheet (10) is located on the back of the cathode sheet (10), and the winding rotation direction information is counterclockwise, the die-cutting and slitting control module determines that the corresponding cathode sheet roll is a second type roll (30b); When the position information received by the die-cutting and slitting control module is that the large film width layer (11) on the cathode sheet (10) is located on the front side of the cathode sheet (10), and the winding rotation direction information is clockwise, the die-cutting and slitting control module determines that the corresponding cathode sheet roll is a second type roll (30b).

12. The pole piece deviation correction control system according to claim 11, characterized in that: The winding machine is divided into a first type of winding machine (1a) and a second type of winding machine (1b); the unwinding hanging shaft (300) of the first type of winding machine (1a) is located on the left side of the winding needle (100), and the unwinding hanging shaft (300) of the second type of winding machine (1b) is located on the right side of the winding needle (100); the first type of winding machine (1a) and the second type of winding machine (1b) are both provided with the first visual inspection module (200), and the first visual inspection module (200) is located on the side of the winding needle (100) facing the unwinding hanging shaft (300); The unwinding hanging shaft (300) of the first type of winding machine (1a) is used to load the first type of material roll (30a), so that the side of the cathode film (10) unwinding and output by the unwinding hanging shaft (300) of the first type of winding machine (1a) with the large film width layer (11) faces the first visual inspection module (200); The unwinding hanging shaft (300) of the second type of winding machine (1b) is used to load the second type of material roll (30b), so that the cathode film (10) unwound and output by the unwinding hanging shaft (300) of the second type of winding machine (1b) has a side with a large film width layer (11) facing the first visual inspection module (200).

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