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CN-121048506-B - Pole piece measuring method, measuring device and measuring system

CN121048506BCN 121048506 BCN121048506 BCN 121048506BCN-121048506-B

Abstract

The application discloses a pole piece measuring method, a measuring device and a measuring system, wherein the measuring device acquires a first image of a pole piece to be measured, which is acquired by an image acquisition component, identifies a measuring object of the pole piece to be measured in the first image to obtain a measuring object identification result, wherein the measuring object identification result comprises at least two characteristic points on the measuring object, identifies a scale on a roller in the first image to obtain a scale identification result, the scale is circumferentially arranged along the outer circumferential surface of the roller, the scale identification result comprises at least one of a scale mark, a zone bit and a position of the scale, the zone bit is used for indicating a preset position of the scale along the circumferential surface of the roller, the position is a side position of the scale in the axial direction of the roller, and the size measurement result of the measuring object is determined based on the measuring object identification result and the scale identification result. Based on the scheme, the accuracy and the efficiency of pole piece measurement can be effectively improved.

Inventors

  • YOU JINWEI
  • ZHUANG WEILIN
  • LIU MENGHAN

Assignees

  • 宁德时代润智软件科技有限公司
  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20251105

Claims (16)

  1. 1. A method of measuring a pole piece, the method comprising: acquiring a first image of the pole piece to be detected, which is acquired by an image acquisition component; Identifying a measured object of the pole piece to be measured in the first image to obtain a measured object identification result, wherein the measured object identification result comprises at least two characteristic points on the measured object, and the at least two characteristic points comprise at least two first characteristic points of the measured object in the tape moving direction and/or at least two second characteristic points of the measured object in the pole piece width direction; the method comprises the steps of identifying a scale on a roller passing through a first image to obtain a scale identification result, wherein the scale is circumferentially arranged along the outer circumferential surface of the roller passing through the first image, the scale identification result comprises at least one of scale marks, marker bits and side positions of the scale, the marker bits are used for indicating preset positions of the scale along the outer circumferential surface of the roller passing through the first image, and the side positions represent the side positions of the scale in the axial direction of the roller passing through the first image; And determining a dimension measurement result of the measurement object based on the measurement object identification result and the scale identification result.
  2. 2. The method for measuring a pole piece according to claim 1, wherein the scale is exposed to the pole piece to be measured; the determining a dimension measurement result of the measurement object based on the measurement object identification result and the scale identification result includes: determining a first dimension of the measuring object in the direction of tape running based on at least two first feature points of the measuring object in the direction of tape running and the scale recognition result, and/or, And determining a second dimension of the measuring object in the width direction of the pole piece based on at least two second characteristic points of the measuring object in the width direction of the pole piece and the ruler recognition result.
  3. 3. The method of measuring pole pieces according to claim 2, wherein the at least two first feature points include at least a first sub-feature point for indicating a start position of the measuring object in the direction of travel and a second sub-feature point for indicating an end position of the measuring object in the direction of travel; the determining a first dimension of the measurement object in the tape direction based on at least two first feature points of the measurement object in the tape direction and the scale recognition result includes: determining a first length between the first sub-feature point and the first-occurring zone bit and a second length between the second sub-feature point and the last-occurring zone bit based on the scale mark; Determining a third length based on the zone bit, wherein the third length represents the length of a complete circumferential path formed by the measuring object driven by the over-roller rotation; And determining the sum of the first length, the second length and the third length as a first dimension of the measuring object in the tape moving direction.
  4. 4. A method of measuring pole pieces according to claim 3, wherein the determining a first length between the first sub-feature point and the first occurring flag bit based on the tick mark comprises: in the scale line, determining a first scale line which is closest to the first sub-feature point after the first sub-feature point; determining a second scale line which is closest to the marker bit before the first occurrence position of the marker bit in the scale lines; Determining a distance between the first scale line and the second scale line as a first sub-distance; determining a distance between the first sub-feature point and the first scale line as a second sub-distance; determining the distance between the second scale mark and the first-occurring zone bit as a third sub-distance; and determining the sum of the first sub-distance, the second sub-distance and the third sub-distance as the first length.
  5. 5. A method of measuring pole pieces according to claim 3, wherein said determining a second length between the second sub-feature point and the last occurring bit comprises: A third scale mark which is closest to the last-time sign bit after the last-time sign bit is determined in the scale marks; determining a fourth scale line which is closest to the second sub-feature point before the second sub-feature point in the scale lines; determining the distance between the third scale mark and the fourth scale mark as a fourth sub-distance; determining the distance between the last-appearing marker bit and the third scale mark as a fifth sub-distance; Determining the distance between the fourth scale line and the second sub-feature point as a sixth sub-distance; and determining the sum of the fourth sub-distance, the fifth sub-distance and the sixth sub-distance as the second length.
  6. 6. A method of measuring pole pieces according to claim 3, wherein the determining a third length based on the flag bit comprises: determining the complete number of turns formed by the rotation of the over roller of the measuring object according to the occurrence times of the marker bit; The third length is determined based on the complete turn and the circumference of the circumferential wrap of the pass roller.
  7. 7. The method according to claim 2, wherein the outer peripheral surface of the passing roller has two scales respectively located at both ends of the passing roller, wherein the determining the second dimension of the measuring object in the pole piece width direction based on at least two second feature points of the measuring object in the pole piece width direction and the scale recognition result comprises: determining the number of first pixel blocks between two scales based on the side edge positions of the two scales in the scale identification result; Determining a pixel block distance according to the number of the first pixel blocks and the actual physical distance between the two scales, wherein the pixel block distance represents the actual physical distance corresponding to one pixel block; Determining a second pixel block number between two end edges of the measuring object in the width direction of the pole piece based on the at least two second characteristic points; and determining the second size according to the second pixel block quantity and the pixel block distance.
  8. 8. A method of measuring a pole piece according to any of claims 1 to 7, characterized in that the method further comprises: Determining the distance between any two scale marks according to the scale marks of the scale in the scale identification result, and determining whether a slipping phenomenon exists according to the distance; Determining whether the image acquisition component is abnormal or not according to the number of subdivided graduation marks between any two graduation marks of the staff gauge; And under the condition that the slipping phenomenon does not exist and the image acquisition assembly is not abnormal, determining that the measurement state is normal, and measuring the pole piece to be measured.
  9. 9. The method of measuring pole pieces of claim 8, wherein the determining whether a slip phenomenon exists according to the pitch comprises: determining that a slipping phenomenon exists under the condition that the distance is different from a preset distance parameter; and under the condition that the distance is the same as the preset distance parameter, determining that no slipping phenomenon exists.
  10. 10. The method according to claim 8, wherein determining whether the image acquisition component is abnormal according to the number of subdivided graduation marks between any two graduation marks of the scale comprises: Determining that the image acquisition assembly is abnormal under the condition that the number of the subdivided graduation lines is different from the number of the preset graduation lines; and under the condition that the number of the subdivided graduation lines is the same as the number of the preset graduation lines, determining that the image acquisition assembly is normal.
  11. 11. The method of measuring a pole piece of claim 8, further comprising: generating spot inspection success indication information under the condition that the dimension measurement result accords with the preset error condition of the pole piece to be detected; and generating spot inspection failure indication information under the condition that the dimension measurement result does not meet the preset error condition or the measurement state is abnormal.
  12. 12. A measuring device, characterized in that the measuring device comprises an acquisition unit, an identification unit and a determination unit; the acquisition unit is used for acquiring a first image of the pole piece to be detected, which is acquired by the image acquisition component; The device comprises a first image, a second image, a recognition unit, a scale recognition unit and a side position, wherein the first image is used for recognizing a measured object of a pole piece to be measured in the first image to obtain a measured object recognition result, the scale on a roller passing in the first image is recognized to obtain a scale recognition result, the scale is circumferentially arranged along the outer peripheral surface of the roller passing, the measured object recognition result is used for representing the outline edge of the measured object, the measured object recognition result comprises at least two characteristic points on the measured object, the at least two characteristic points comprise at least two first characteristic points of the measured object in the tape moving direction and/or at least two second characteristic points of the measured object in the pole piece width direction, the scale recognition result comprises at least one of a scale mark, a marker bit and a side position of the scale, the marker bit is used for indicating a preset position of the scale surrounding along the outer peripheral surface of the roller passing, and the side position represents the side position of the scale in the axial direction of the roller passing; The determining unit is configured to determine a dimension measurement result of the measurement object based on the measurement object identification result and the scale identification result.
  13. 13. The measuring system is characterized by comprising a measuring device, an image acquisition assembly and a roller with a scale, wherein the scale is circumferentially arranged along the outer peripheral surface of the roller; the image acquisition component is used for acquiring a first image of the pole piece to be detected; The measuring device is used for acquiring the first image, identifying a measuring object of a pole piece to be measured in the first image to obtain a measuring object identification result, identifying a scale on a roller passing through the first image to obtain a scale identification result, determining a dimension measuring result of the measuring object based on the measuring object identification result and the scale identification result, wherein the scale is arranged along the outer circumferential surface of the roller passing through the first image in a circumferential direction, the measuring object identification result comprises at least two characteristic points on the measuring object, the at least two characteristic points comprise at least two first characteristic points of the measuring object in the travelling direction and/or at least two second characteristic points of the measuring object in the width direction of the pole piece, the scale identification result comprises at least one of a scale mark, a marker position and a side position of the scale, the marker position is used for indicating a preset position of the scale surrounding along the outer circumferential surface of the roller passing through the first image, and the side position is used for representing the side position of the scale in the axial direction of the roller passing through the second image.
  14. 14. The measurement system of claim 13, wherein the scale is exposed to the pole piece under test; The measuring device is also used for determining a first dimension in the tape moving direction based on at least two first characteristic points of the measuring object in the tape moving direction and a ruler identification result, and/or determining a second dimension in the width direction of the pole piece based on at least two second characteristic points of the measuring object in the width direction of the pole piece and a ruler identification result.
  15. 15. The measurement system of claim 14, wherein the outer peripheral surface of the over-roller has two scales, respectively located at both ends of the over-roller; The measuring device is further used for determining the number of first pixel blocks between the two scales based on the side edge positions of the two scales in the scale identification result, determining the pixel block distance according to the number of the first pixel blocks and the actual physical distance between the two scales, determining the number of second pixel blocks between the edges of the two ends of the measuring object in the width direction of the pole piece based on the at least two second characteristic points, and determining the second size of the measuring object in the width direction of the pole piece according to the number of the second pixel blocks and the pixel block distance, wherein the pixel block distance represents the actual physical distance corresponding to one pixel block.
  16. 16. The measurement system according to any one of claims 13 to 15, wherein, The measuring device is also used for determining whether the slipping phenomenon exists according to the distance between any two scale marks of the scale, and determining whether the image acquisition assembly is abnormal according to the number of subdivision scale marks between any two scale marks of the scale.

Description

Pole piece measuring method, measuring device and measuring system Technical Field The present application relates to the field of battery technologies, and in particular, to a method, an apparatus, and a system for measuring a pole piece. Background In the reel-type continuous production process of the lithium battery pole piece, the dynamic measurement requirement on the pole piece exists, however, the current measurement mainly depends on the image quality, and the measurement precision is seriously affected when the image quality is poor, so that the technical problem to be solved is how to accurately measure the pole piece in the continuous production process of the pole piece. Disclosure of Invention The embodiment of the application provides a pole piece measuring method, a pole piece measuring device and a pole piece measuring system, which can effectively improve the accuracy and efficiency of pole piece measurement. The technical scheme of the embodiment of the application is realized as follows: in a first aspect, an embodiment of the present application provides a method for measuring a pole piece, where the method includes: acquiring a first image of the pole piece to be detected, which is acquired by an image acquisition component; Identifying a measuring object of the pole piece to be measured in the first image to obtain a measuring object identification result, wherein the measuring object identification result comprises at least two characteristic points on the measuring object; the method comprises the steps of identifying a scale on a roller in a first image to obtain a scale identification result, wherein the scale is circumferentially arranged along the outer peripheral surface of the roller, the scale identification result comprises at least one of a scale mark, a marker bit and a side position of the scale, the marker bit is used for indicating a preset position of the scale along the outer peripheral surface of the roller, and the side position represents the side position of the scale in the axial direction of the roller; a dimension measurement result of the measurement object is determined based on the measurement object identification result and the scale identification result. In the embodiment, the production process of the pole piece is not required to be interrupted, the image acquisition is carried out through the image acquisition component, the characteristic points of the measured object and the scales on the passing roller are identified by utilizing the image, the dimension measurement result can be determined in real time, the link delay of step measurement is avoided, the continuous production rhythm can be adapted, the measurement efficiency is improved, the scales circumferentially and circumferentially arranged around the peripheral surface of the passing roller can provide stable physical reference for measurement, the measurement precision of the relevant dimension of the pole piece is controlled in a high precision range, and the measurement accuracy of the pole piece is effectively improved. In some embodiments of the application, the scale is exposed to the pole piece to be measured, and the at least two characteristic points comprise at least two first characteristic points of the measuring object in the tape running direction and/or at least two second characteristic points in the width direction of the pole piece; Determining a measurement result of the dimension of the measurement object based on the measurement object identification result and the scale identification result, comprising: determining a first dimension in the direction of tape travel based on at least two first feature points of the measurement object in the direction of tape travel and the scale recognition result, and/or, A second dimension in the pole piece width direction is determined based on at least two second feature points of the measurement object in the pole piece width direction, and the scale recognition result. In the embodiment of the application, the dimensions in the two directions of the tape moving direction and the pole piece width direction can be measured, for the tape moving direction, the measurement can be realized based on the first characteristic point of the measuring object in the tape moving direction and the identification result of the scale, and for the pole piece width direction, the measurement can be realized based on the second characteristic point in the pole piece width direction and the identification result of the scale, so that the accuracy of the measurement in the tape moving direction and the pole piece width direction can be improved. In some embodiments of the present application, the at least two first feature points include a first sub-feature point for indicating a start position of the measurement object in the direction of travel and a second sub-feature point for indicating an end position of the measurement object in the direction of t