A coating correction method and system

Abstract

This invention relates to the field of battery technology, specifically disclosing a coating correction method and a coating system. The coating correction method includes: after completing wet film coating on surface A of the electrode, acquiring an image of the wet film coating on surface A and calculating the width difference between the blank areas on both sides of surface A. A According to the width difference A Determine the correction amount for side A; after side A of the electrode is dried and side B is wet-coated, acquire images of the dried side A and the wet-coated side B, and calculate the alignment between the coated areas on side A and side B. Determine the correction amount for side B based on this alignment. This invention uses multiple acquisitions of the wet-coated side A images and calculates the average of the width differences of multiple edge blanking areas as... A This effectively eliminates measurement errors caused by accidental factors such as electrode jitter, image noise, or uneven local coating in a single measurement, and improves the detection accuracy and stability of the width difference of the blank area on both sides of the A-side.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a coating correction method and system. Background Technology

[0002] In battery manufacturing, the alignment of the coatings on both sides of the electrode (denoted as side A and side B) directly affects the battery's performance and safety. Poor alignment between side A and side B will prevent the active material coatings on both sides of the electrode from fully overlapping, thus affecting battery performance. Furthermore, it affects the electrode slitting width in subsequent processes; a smaller material area width results in a smaller actual capacity of the positive electrode. Conversely, a smaller negative electrode material area width can lead to abnormal coating of the positive and negative electrodes, causing lithium plating or short circuits. Summary of the Invention

[0003] Based on this, the purpose of this invention is to provide a coating correction method and system that systematically eliminates the cumulative errors caused by factors such as equipment and substrate during the electrode coating process, significantly improves the overall alignment accuracy of the coating on side A and side B, effectively avoids performance and safety problems such as battery capacity reduction, lithium plating, and short circuits caused by insufficient coating overlap, and greatly improves the yield and consistency of the coating process.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This invention first provides a coating correction method, which includes the following steps: S1. After completing the wet film coating on side A of the electrode, acquire the wet film coating image of side A and calculate the width difference of the blank areas on both sides of side A. A According to the width difference A Determine the correction amount for side A; S2. After drying is completed on side A of the electrode and wet film coating is completed on side B, obtain the drying image of side A and the wet film coating image of side B, and calculate the alignment degree between the coating area on side A and the coating area on side B. Determine the correction amount of side B based on the alignment degree.

[0005] The coating correction method provided by this invention acquires the wet film coating image, the dry image of side A, and the wet film coating image of side B in three steps, and calculates the width difference of the blank areas on both sides of side A. AAnd the alignment degree between the A-side coating area and the B-side coating area, so as to independently determine the A-side deviation correction amount and the B-side deviation correction amount. This method can timely correct the position deviation of the A side itself after the A side is coated, avoiding bringing the coating offset of the A side itself into the subsequent B-side coating process; at the same time, based on the comparison between the actual coating position of the dried A side and the wet film position of the B side after the B side is coated, the B side can be accurately aligned with respect to the A side. Through the above two-stage deviation correction mechanism of self-deviation correction first and then mutual alignment, the cumulative errors caused by factors such as equipment and base materials in the pole piece coating process can be systematically eliminated, significantly improving the overall alignment accuracy of the A-side and B-side coatings, effectively avoiding performance and safety problems such as battery capacity decline, lithium deposition, and short circuit caused by insufficient coating overlap, and greatly improving the yield and consistency of the coating process.

[0006] As a further improvement of the above solution of the present invention, the obtaining of the width difference between the blank areas on both sides of the A side includes: Obtaining the wet film coating images of the A side multiple times; Calculating the difference in the width of the blank areas on both sides according to each wet film coating image of the A side to obtain multiple differences; Calculating the average value of the multiple differences to obtain the width difference between the blank areas on both sides of the A side A 。

[0007] The present invention obtains the wet film coating images of the A side multiple times and calculates the average value of the width differences of multiple blank areas on the edges as A , effectively eliminating the measurement errors caused by accidental factors such as pole piece jitter, image noise, or local coating unevenness in single measurement, and improving the detection accuracy and stability of the width difference between the blank areas on both sides of the A side.

[0008] As a further improvement of the above solution of the present invention, the determining of the A-side deviation correction amount according to the width difference includes: Presetting a first threshold X1 and a second threshold X2, both X1 and X2 are positive values and X1 < X2; If | A | < X1, the A-side deviation correction amount is determined to be 0; If X1 ≤ | A | ≤ X2, the A-side deviation correction amount is determined to be A ; If A > X2, the A-side deviation correction amount is determined to be X2; If A < -X2, the A-side deviation correction amount is determined to be -X2.

[0009] Based on the more reliable The A-side rectification amount determined by the value of A can avoid ineffective rectification or over-rectification caused by misjudgment, making the control of the A-side coating position more stable and accurate, laying a good foundation for the alignment accuracy of the subsequent B-side coating, and further improving the robustness of the entire coating rectification system and the feasibility in actual production.

[0010] As a further improvement of the above solution of the present invention, the coating rectification method further includes: Sending the A-side rectification amount to the A-side coating mechanism, and the A-side rectification amount is used to indicate the moving direction and displacement amount of the A-side coating die head; Receiving the A-side response information sent by the A-side coating mechanism, and the A-side response information is used to indicate that the rectification of the A-side coating die head has ended; Responding to the A-side response information, re-executing step S1 until | A | < X1.

[0011] By performing closed-loop iterative rectification on the A side, it is ensured that before entering the B-side coating process, the position of the A-side coating relative to the pole piece substrate has been strictly controlled within X1. The influence of the self-offset of the A side on the subsequent alignment is eliminated from the source, enabling the B-side rectification link to focus on compensating for the position deviation of the B side relative to the A side, thereby overall improving the alignment accuracy of the A-side and B-side coatings and effectively reducing the battery performance deterioration and safety hazards caused by poor alignment.

[0012] As a further improvement of the above solution of the present invention, the obtaining the alignment degree of the A-side coating area and the B-side coating area and determining the B-side rectification amount according to the alignment degree includes: Synchronously collecting the dry image of the A side and the wet film coating image of the B side multiple times to obtain multiple pairs of images Calculating the alignment degree of the A-side coating area and the B-side coating area according to each pair of images to obtain multiple alignment degree data groups; Determining a target rectification amount according to each alignment degree data group to obtain multiple target rectification amounts; Calculating the average value of multiple target rectification amounts mean ; Presetting a first threshold X1 and a second threshold X2, both X1 and X2 are positive values and X1 < X2; If | mean | < X1, then the B-side rectification amount is determined to be 0; If X1 ≤ | mean | ≤ X2, then the B-side rectification amount is determined to be mean ; like mean If the value is >X2, then the correction amount for side B is determined to be X2. like mean If the deviation is less than -X2, then the deviation correction amount on plane B is determined to be -X2.

[0013] This invention acquires multiple images of the dried area on side A and the wet film coating area on side B, and calculates the alignment between the coating areas on side A and side B multiple times. The average value of the target correction amount is then calculated based on the alignment data. mean According to the average value mean Confirming the B-side correction amount effectively eliminates measurement errors caused by accidental factors such as electrode jitter, image noise, or uneven local coating in a single measurement. It can avoid invalid or excessive correction due to misjudgment, making the control of the B-side coating position more stable and accurate.

[0014] As a further improvement to the above-described solution of the present invention, the number of coating areas on side A is equal to and even with the number of coating areas on side B; the step of calculating the alignment between the coating areas on side A and side B based on the image includes: Calculate the width L of the blank area at the first edge of surface A sequentially. A1 Width A of each coating area i Distance A between adjacent coating areas i→i+1 The width L of the second side edge blank area A2 i is an integer and 1 ≤ i ≤ Y, Y is the number of coated areas and Y is an integer; A i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface A; Calculate the width L of the blank area at the first edge of surface B sequentially. B1 Width B of each coating area i Distance B between adjacent coating areas i→i+1 The width L of the second side edge blank area B2 B i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface B. Calculate the alignment between the coating area on side A and the coating area on side B: Alignment of the first coating area: First side alignment =L A1 -L B1 Second side alignment =(L A1 +A1)-(L B1 +B1); Alignment of the second coating area: Alignment of the first side =(L A1 +A1+A1→2 )-(L B1 +B1+B 1→2 ), second side alignment =(L A1 +A1+A 1→2 +A2)-(L B1 +B1+B 1→2 +B2); … Alignment of the Y / 2 coating region: Alignment of the first side =(L A1 +A1+A 1→2 +…+A Y / 2-1 +A Y / 2-1→Y / 2 )-(L B1 +B1+B 1→2 +…+B Y / 2-1 +B Y / 2-1→Y / 2 ), second side alignment =L A1 +A1+A 1→2 +A2…+A Y / 2-1 +A Y / 2-1→Y / 2 +A Y / 2 )-(L B1 +B1+B 1→2 +B2…B Y / 2-1 +B Y / 2-1→Y / 2 +B Y / 2 ); Alignment of the Y / 2+1 coating region: First side alignment =(L B2 +B Y +…+B Y / 2→Y / 2+1 +B Y / 2 )-(L A2 +A Y +…+A Y / 2→Y / 2+1 +A Y / 2 ), second side alignment =(L B2 +B Y +…+B Y / 2→Y / 2+1 )-(L A2 +A Y +…+A Y / 2→Y / 2+1 ); … Alignment of the Y-th coating region: Alignment of the first side =(L B2 +B Y )-(L A2 +A Y ), second side alignment =L B2 -L A2 .

[0015] As a further improvement to the above-described solution of the present invention, the number of coating areas on side A is equal to and odd in number with the number of coating areas on side B; the step of calculating the alignment between the coating areas on side A and side B based on the image includes: Calculate the width L of the blank area at the first edge of surface A sequentially. A1 Width A of each coating area i Distance A between adjacent coating areas i→i+1 The width L of the second side edge blank area A2 i is an integer and 1 ≤ i ≤ Y, Y is the number of coated areas and Y is an integer; A i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface A; Calculate the width L of the blank area at the first edge of surface B sequentially. B1 Width B of each coating area i Distance B between adjacent coating areas i→i+1 The width L of the second side edge blank area B2 B i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface B. Calculate the alignment between the coating area on side A and the coating area on side B: Alignment of the first coating area: First side alignment =L A1 -L B1 Second side alignment =(L A1 +A1)-(L B1 +B1); Alignment of the second coating area: Alignment of the first side =(L A1 +A1+A 1→2 )-(L B1 +B1+B 1→2 ), second side alignment =(L A1 +A1+A 1→2 +A2)-(L B1 +B1+B 1→2 +B2); … No. Alignment of the coating area: Alignment of the first side =(L A1 +A1+A 1→2 +…+A （Y-1） / 2 +A （Y-1） / 2→（Y-1） / 2+1 )-(L B1 +B1+B 1→2 +…+B （Y-1） / 2 +B （Y-1） / 2→（Y-1） / 2+1 ), second side alignment =(L B2 +B Y +…+B （Y-1） / 2+1→（Y-1） / 2+2 )-(L A2 +A Y +…+A （Y-1） / 2+1→（Y-1） / 2+2 ); … Alignment of the Y-th coating region: Alignment of the first side =(L B2 +B Y )-(L A2 +A Y ), second side alignment =L B2 -L A2 .

[0016] As a further improvement to the above-described solution of the present invention, the step of determining a target correction amount based on the alignment data set includes: (1) The first correction value is preset to Q1 = -0.5; (2) Calculate the maximum alignment value under the first correction value Q1. mean and the difference in width between the blank areas on both sides of side B. ; (3) Calculate the second correction value Q2 = Q1 + 0.1 and the maximum alignment value. mean and the difference in width between the blank areas on both sides of side B. ; (4) Determine whether the following conditions are met: n≤N, Q2≤|Q1|, w≤W or w≤|Q1|; if not, the target correction amount on side B is determined to be Q1; if yes, proceed to step (5). (5) Determine if n is equal to N; if not, set Q1=Q2, N=n, M=m and then execute step (2); if yes, execute step (6). (6) Determine whether m is less than or equal to M; if not, the target of the B-side correction amount is determined to be Q1; if yes, the target of the B-side correction amount is determined to be Q2.

[0017] As a further improvement to the above-described solution of the present invention, the coating correction method further includes: Send B-side correction amount to the B-side coating mechanism. The B-side correction amount is used to indicate the moving direction and displacement of the B-side coating die head. Receive B-side response information sent by the B-side coating mechanism, the B-side response information being used to indicate that the correction of the B-side coating die head has ended; In response to the B-side response information, step S2 is re-executed until | mean | <X1。

[0018] By performing closed-loop iterative correction on the B side, the position of the B side coating relative to the electrode substrate is strictly controlled within X1, improving the alignment accuracy between the A side and the B side coating, and effectively reducing battery performance degradation and safety hazards caused by poor alignment.

[0019] The present invention also provides a coating system comprising: The unwinding mechanism is used to unwind the electrode sheets; A-side coating mechanism, used to coat the A-side of the unwound electrode sheet; The B-side coating mechanism is located after the A-side coating mechanism and is used to coat the B-side of the electrode sheet. A drying mechanism is used to dry the electrode sheet after it has been coated by the A-side coating mechanism and the B-side coating mechanism; A visual inspection system is used to perform the steps of the coating correction method described above. This is achieved by acquiring multiple wet film coating images of surface A and calculating the average of the width differences of multiple edge blanking areas. A effectively eliminates measurement errors caused by accidental factors such as electrode jitter, image noise, or uneven local coating in a single measurement, and improves the detection accuracy and stability of the width difference of the blank area on both sides of surface A. Attached Figure Description

[0020] Figure 1 This is an image of the wet film coating on side A of the electrode in a coating correction method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the logic principle of electrode B-face alignment calculation in a coating correction method provided in an embodiment of the present invention. Detailed Implementation

[0021] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0023] This embodiment proposes a coating correction method, which includes the following steps: S1. After completing the wet film coating on side A of the electrode, acquire the wet film coating image of side A and calculate the width difference of the blank areas on both sides of side A. A According to the width difference A Determine the correction amount for side A.

[0024] Obtaining the width difference of the blank areas on both sides of surface A involves the following steps: acquiring wet film coating images of surface A multiple times (10 times in this embodiment); calculating the width difference of the blank areas on both sides based on each wet film coating image of surface A, resulting in multiple differences, such as... Figure 1 As shown, taking a coating pattern of one coating layer out of three layers as an example, the width difference of the blank areas on both sides of the coating layer is L1 - L2; the average of multiple differences is calculated to obtain the width difference of the blank areas on both sides of the coating layer of surface A. A .

[0025] Based on the width difference A Determining the correction amount for surface A involves the following steps: A first threshold X1 and a second threshold X2 are preset. In this embodiment, X1=0.2 and X2=0.5. If | A If |<0.2, then the correction amount for surface A is determined to be 0; If 0.2≤| A If |≤0.5, then the correction amount for surface A is determined as follows: A ; like A If the value is greater than 0.5, then the correction amount for side A is determined to be 0.5. like A If the value is less than -0.5, then the correction amount for surface A is determined to be -0.5.

[0026] S2. Send an A-side correction amount to the A-side coating mechanism, the A-side correction amount indicating the direction of movement of the A-side coating die head; receive A-side response information from the A-side coating mechanism, the A-side response information indicating that the correction of the A-side coating die head has ended; in response to the A-side response information, re-execute step S1 until | A |<0.2, keep the A-side correction amount <0.2.

[0027] The A-side correction amount is used to indicate the moving direction of the A-side coating die head. In this embodiment, if the A-side correction amount is negative, the A-side coating mechanism drives the A-side coating die head to move to the left; if the A-side correction amount is positive, the A-side coating mechanism drives the A-side coating die head to move to the right; the foil remains centered during the correction process.

[0028] S3. After drying is completed on side A of the electrode and wet film coating is completed on side B, obtain the drying image of side A and the wet film coating image of side B, and calculate the alignment between the coating area on side A and the coating area on side B. Determine the correction amount on side B based on the alignment.

[0029] Obtain the alignment between the coating area on side A and the coating area on side B, and determine the correction amount on side B based on the alignment. This includes the following steps: Multiple synchronous acquisitions of dry images of side A and wet film coating images of side B were performed to obtain multiple image pairs; in this embodiment, a total of 10 synchronous acquisitions of dry images of side A and wet film coating images of side B were performed. The alignment of the A-side coating area and the B-side coating area is calculated based on each image pair to obtain multiple alignment data sets; A target correction amount is determined for each alignment data group, resulting in multiple target correction amounts; Calculate the average value of multiple target correction quantities mean ; A first threshold X1 and a second threshold X2 are preset. In this embodiment, X1=0.2 and X2=0.5. If | mean If |<0.2, then the correction amount for side B is determined to be 0; If 0.2≤| mean If |≤0.5, then the correction amount for side B is determined as follows: mean ; like mean If the value is greater than 0.5, then the correction amount for side B is determined to be 0.5. like mean If the value is less than -0.5, then the correction amount for side B is determined to be -0.5.

[0030] The number of coated areas on side A is equal to the number of coated areas on side B. When the number of coated areas is even, the alignment between the coated areas on side A and side B is calculated based on the image, specifically including the following steps: Calculate the width L of the blank area at the first edge of surface A sequentially. A1 Width A of each coating area i Distance A between adjacent coating areas i→i+1 The width L of the second side edge blank area A2 i is an integer and 1 ≤ i ≤ Y, Y is the number of coated areas and Y is an integer; A i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface A; Calculate the width L of the blank area at the first edge of surface B sequentially. B1 Width B of each coating area iDistance B between adjacent coating areas i→i+1 The width L of the second side edge blank area B2 B i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface B. Calculate the alignment between the coating area on side A and the coating area on side B: Alignment of the first coating area: First side alignment =L A1 -L B1 Second side alignment =(L A1 +A1)-(L B1 +B1); Alignment of the second coating area: Alignment of the first side =(L A1 +A1+A 1→2 )-(L B1 +B1+B 1→2 ), second side alignment =(L A1 +A1+A 1→2 +A2)-(L B1 +B1+B 1→2 +B2); … Alignment of the Y / 2 coating region: Alignment of the first side =(L A1 +A1+A 1→2 +…+A Y / 2-1 +A Y / 2-1→Y / 2 )-(L B1 +B1+B 1→2 +…+B Y / 2-1 +B Y / 2-1→Y / 2 ), second side alignment =L A1 +A1+A 1→2 +A2…+A Y / 2-1 +A Y / 2-1→Y / 2 +A Y / 2 )-(L B1 +B1+B 1→2 +B2…B Y / 2-1 +B Y / 2-1→Y / 2 +B Y / 2 ); Alignment of the Y / 2+1 coating region: First side alignment =(L B2 +B Y +…+B Y / 2→Y / 2+1 +B Y / 2 )-(L A2 +A Y +…+A Y / 2→Y / 2+1 +AY / 2 ), second side alignment =(L B2 +B Y +…+B Y / 2→Y / 2+1 )-(L A2 +A Y +…+A Y / 2→Y / 2+1 ); … Alignment of the Y-th coating region: Alignment of the first side =(L B2 +B Y )-(L A2 +A Y ), second side alignment =L B2 -L A2 .

[0031] When the number of coating areas is odd, the alignment between the coating area on side A and the coating area on side B is calculated based on the image, specifically including the following steps: Calculate the width L of the blank area at the first edge of surface A sequentially. A1 Width A of each coating area i Distance A between adjacent coating areas i→i+1 The width L of the second side edge blank area A2 i is an integer and 1 ≤ i ≤ Y, Y is the number of coated areas and Y is an integer; A i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface A; Calculate the width L of the blank area at the first edge of surface B sequentially. B1 Width B of each coating area i Distance B between adjacent coating areas i→i+1 The width L of the second side edge blank area B2 B i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface B. Calculate the alignment between the coating area on side A and the coating area on side B: Alignment of the first coating area: First side alignment =L A1 -L B1 Second side alignment =(L A1 +A1)-(L B1 +B1); Alignment of the second coating area: Alignment of the first side =(L A1 +A1+A 1→2 )-(L B1 +B1+B 1→2 ), second side alignment =(LA1 +A1+A 1→2 +A2)-(L B1 +B1+B 1→2 +B2); … No. Alignment of the coating area: Alignment of the first side =(L A1 +A1+A 1→2 +…+A （Y-1） / 2 +A （Y-1） / 2→（Y-1） / 2+1 )-(L B1 +B1+B 1→2 +…+B （Y-1） / 2 +B （Y-1） / 2→（Y-1） / 2+1 ), second side alignment =(L B2 +B Y +…+B （Y-1） / 2+1→（Y-1） / 2+2 )-(L A2 +A Y +…+A （Y-1） / 2+1→（Y-1） / 2+2 ); … Alignment of the Y-th coating region: Alignment of the first side =(L B2 +B Y )-(L A2 +A Y ), second side alignment =L B2 -L A2 .

[0032] like Figure 2 As shown, taking coating one out of three as an example: Alignment of the first coating area: First side alignment =L A1 -L B1 Second side alignment =(L A1 +A1)-(L B1 +B1); Alignment of the second coating area: Alignment of the first side =(L A1 +A1+A 1→2 )-(L B1 +B1+B 1→2 ), second side alignment =(L B2 +B3+B 2→3 )-(L A1 +A3+A 2→3 ); Alignment of the third coating area: Alignment of the first side =(LB2 +B3)-(L A1 +A3), second side alignment =L B2 -L A2 .

[0033] In this embodiment, determining a target correction amount based on the alignment data set specifically includes the following steps: (1) The first correction value is preset to Q1 = -0.5; (2) Calculate the maximum alignment value under the first correction value Q1. mean and the difference in width between the blank areas on both sides of side B. ; (3) Calculate the second correction value Q2 = Q1 + 0.1 and the maximum alignment value. mean and the difference in width between the blank areas on both sides of side B. ; (4) Determine whether the following conditions are met: n≤N, Q2≤|Q1|, w≤W or w≤|Q1|; if not, the target correction amount on side B is determined to be Q1; if yes, proceed to step (5). (5) Determine if n is equal to N; if not, set Q1=Q2, N=n, M=m and then execute step (2); if yes, execute step (6). (6) Determine whether m is less than or equal to M; if not, the target of the B-side correction amount is determined to be Q1; if yes, the target of the B-side correction amount is determined to be Q2.

[0034] S4. Send a B-side correction amount to the B-side coating mechanism, the B-side correction amount being used to indicate the movement direction of the B-side coating die head; receive B-side response information sent by the B-side coating mechanism, the B-side response information being used to indicate that the correction of the B-side coating die head has ended; in response to the B-side response information, re-execute step S2 until | mean |<0.2, keeping the B-side correction amount <0.2. The B-side correction amount is used to indicate the movement direction of the B-side coating die head. In this embodiment, if the B-side correction amount is negative, the B-side coating mechanism drives the B-side coating die head to move to the left; if the B-side correction amount is positive, the B-side coating mechanism drives the B-side coating die head to move to the right; the foil remains centered during the correction process.

[0035] This embodiment, based on the above-described coating correction method, also provides a coating system, including an unwinding mechanism, an A-side coating mechanism, a B-side coating mechanism, a drying mechanism, and a visual inspection mechanism. The unwinding mechanism is used to unwind the electrode sheet; the A-side coating mechanism is used to coat the A-side of the unwound electrode sheet; the B-side coating mechanism is located after the A-side coating mechanism and is used to coat the B-side of the electrode sheet; the drying mechanism is used to dry the A-side of the electrode sheet after coating by the A-side coating mechanism and to dry the B-side of the electrode sheet after coating by the B-side coating mechanism; the visual inspection system is used to execute the steps of the coating correction method described above.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A coating correction method, characterized in that, It includes the following steps: S1. After completing the wet film coating on side A of the electrode, acquire the wet film coating image of side A and calculate the width difference of the blank areas on both sides of side A. A According to the width difference A Determine the correction amount for side A; S2. After drying is completed on side A of the electrode and wet film coating is completed on side B, obtain the drying image of side A and the wet film coating image of side B, and calculate the alignment degree between the coating area on side A and the coating area on side B. Determine the correction amount of side B based on the alignment degree.

2. The coating correction method according to claim 1, characterized in that, The step of obtaining the width difference of the blank areas on both sides of surface A includes: Multiple images of the wet film coating on surface A were acquired. The difference in the width of the blank areas on both sides of each side is calculated based on the wet film coating images of each side A, resulting in multiple differences; Calculate the average of multiple differences to obtain the width difference of the blank areas on both sides of surface A. A .

3. The coating correction method according to claim 1, characterized in that, The based on the width difference A Determine the correction amount for surface A, including: Preset a first threshold X1 and a second threshold X2, where both X1 and X2 are positive and X1 <X2; If | A | < X1, the deviation correction amount of the A surface is determined to be 0; If X1≤| A If |≤X2, then the correction amount for surface A is determined as A ; like A If the value is greater than X2, then the correction amount for surface A is determined to be X2. like A If the value is less than -X2, then the correction amount for surface A is determined to be -X2.

4. The coating correction method according to claim 3, characterized in that, The coating correction method further includes the following steps before step S2: S11. Send an A-side correction amount to the A-side coating mechanism, the A-side correction amount indicating the direction and displacement of the A-side coating die head; receive A-side response information from the A-side coating mechanism, the A-side response information indicating that the correction of the A-side coating die head has ended; in response to the A-side response information, re-execute step S1 until | A | <X1。 5. The coating correction method according to claim 1, characterized in that, The step of obtaining the alignment between the coating area on side A and the coating area on side B, and determining the correction amount on side B based on the alignment, includes: Multiple sets of image pairs were obtained by simultaneously acquiring images of the A-side drying process and the B-side wet film coating process. The alignment of the A-side coating area and the B-side coating area is calculated based on each image pair to obtain multiple alignment data sets; A target correction amount is determined for each alignment data group, resulting in multiple target correction amounts; Calculate the average value of multiple target correction quantities mean ; Preset a first threshold X1 and a second threshold X2, where both X1 and X2 are positive and X1 <X2; If | mean | < X1, the deviation correction amount of surface B is determined to be 0; If X1≤| mean If |≤X2, then the correction amount for surface B is determined as mean ; like mean If the value is >X2, then the correction amount for side B is determined to be X2. like mean If the deviation is less than -X2, then the deviation correction amount on plane B is determined to be -X2.

6. The coating correction method according to claim 5, characterized in that, The number of coated areas on side A is equal to and even with the number of coated areas on side B; the step of calculating the alignment between the coated areas on side A and side B based on the image includes: Calculate the width L of the blank area at the first edge of surface A sequentially. A1 Width A of each coating area i Distance A between adjacent coating areas i→i+1 The width L of the second side edge blank area A2 i is an integer and 1 ≤ i ≤ Y, Y is the number of coated areas and Y is an integer; A i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface A; Calculate the width L of the blank area at the first edge of surface B sequentially. B1 Width B of each coating area i Distance B between adjacent coating areas i→i+1 The width L of the second side edge blank area B2 B i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface B. Calculate the alignment between the coating area on side A and the coating area on side B: Alignment of the first coating area: First side alignment =L A1 -L B1 Second side alignment =(L A1 +A1)-(L B1 +B1); Alignment of the second coating area: Alignment of the first side =(L A1 +A1+A 1→2 )-(L B1 +B1+B 1→2 ), second side alignment =(L A1 +A1+A 1→2 +A2)-(L B1 +B1+B 1→2 +B2); … Alignment of the Y / 2 coating region: Alignment of the first side =(L A1 +A1+A 1→2 +…+A Y / 2-1 +A Y / 2-1→Y / 2 )-(L B1 +B1+B 1→2 +…+B Y / 2-1 +B Y / 2-1→Y / 2 ), second side alignment =L A1 +A1+A 1→2 +A2…+A Y / 2-1 +A Y / 2-1→Y / 2 +A Y / 2 )-(L B1 +B1+B 1→2 +B2…B Y / 2-1 +B Y / 2-1→Y / 2 +B Y / 2 ); Alignment of the Y / 2+1 coating region: First side alignment =(L B2 +B Y +…+B Y / 2→Y / 2+1 +B Y / 2 )-(L A2 +A Y +…+A Y / 2→Y / 2+1 +A Y / 2 ), second side alignment =(L B2 +B Y +…+B Y / 2→Y / 2+1 )-(L A2 +A Y +…+A Y / 2→Y / 2+1 ); … Alignment of the Y-th coating region: Alignment of the first side =(L B2 +B Y )-(L A2 +A Y ), second side alignment =L B2 -L A2 .

7. The coating correction method according to claim 5, characterized in that, The number of coated areas on side A is equal to and odd in number with the number of coated areas on side B; the step of calculating the alignment between the coated areas on side A and side B based on the image includes: Calculate the width L of the blank area at the first edge of surface A sequentially. A1 Width A of each coating area i Distance A between adjacent coating areas i→i+1 The width L of the second side edge blank area A2 i is an integer and 1 ≤ i ≤ Y, Y is the number of coated areas and Y is an integer; A i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface A; Calculate the width L of the blank area at the first edge of surface B sequentially. B1 Width B of each coating area i Distance B between adjacent coating areas i→i+1 The width L of the second side edge blank area B2 B i→i+1 This represents the distance between the i-th coating area and the (i+1)-th coating area on surface B. Calculate the alignment between the coating area on side A and the coating area on side B: Alignment of the first coating area: First side alignment =L A1 -L B1 Second side alignment =(L A1 +A1)-(L B1 +B1); Alignment of the second coating area: Alignment of the first side =(L A1 +A1+A 1→2 )-(L B1 +B1+B 1→2 ), second side alignment =(L A1 +A1+A 1→2 +A2)-(L B1 +B1+B 1→2 +B2); … No. Alignment of the coating area: Alignment of the first side =(L A1 +A1+A 1→2 +…+A （Y-1） / 2 +A （Y-1） / 2→（Y-1） / 2+1 )-(L B1 +B1+B 1→2 +…+B （Y-1） / 2 +B （Y-1） / 2→（Y-1） / 2+1 ), second side alignment =(L B2 +B Y +…+B （Y-1） / 2+1→（Y-1） / 2+2 )-(L A2 +A Y +…+A （Y-1） / 2+1→（Y-1） / 2+2 ); … Alignment of the Y-th coating region: Alignment of the first side =(L B2 +B Y )-(L A2 +A Y ), second side alignment =L B2 -L A2 .

8. The coating correction method according to claim 6 or 7, characterized in that, The step of determining a target correction amount based on the alignment data set includes: (1) The first correction value is preset to Q1 = -0.5; (2) Calculate the maximum alignment value under the first correction value Q1. mean and the difference in width between the blank areas on both sides of side B. ; (3) Calculate the second correction value Q2 = Q1 + 0.1 and the maximum alignment value. mean and the difference in width between the blank areas on both sides of side B. ; (4) Determine whether the following conditions are met: n≤N, Q2≤|Q1|, w≤W or w≤|Q1|; if not, the target correction amount on side B is determined to be Q1; if yes, proceed to step (5). (5) Determine if n is equal to N; if not, set Q1=Q2, N=n, M=m and then execute step (2); if yes, execute step (6). (6) Determine whether m is less than or equal to M; if not, the target of the B-side correction amount is determined to be Q1; if yes, the target of the B-side correction amount is determined to be Q2.

9. The coating correction method according to claim 5, characterized in that, The coating correction method further includes the following steps after step S2: S21. Send a B-side correction amount to the B-side coating mechanism, the B-side correction amount being used to indicate the moving direction and displacement of the B-side coating die head; receive B-side response information sent by the B-side coating mechanism, the B-side response information being used to indicate that the correction of the B-side coating die head has ended; in response to the B-side response information, re-execute step S2 until | mean | <X1。 10. A coating system, characterized in that, It includes: The unwinding mechanism is used to unwind the electrode sheets; A-side coating mechanism, used to coat the A-side of the unwound electrode sheet; The B-side coating mechanism is located after the A-side coating mechanism and is used to coat the B-side of the electrode sheet. A drying mechanism is used to dry the electrode sheet after it has been coated by the A-side coating mechanism and the B-side coating mechanism; A vision inspection system for performing the steps of the coating correction method as described in any one of claims 1-9.

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