CN117274160B - Method for aligning lithium battery winding tab with closed loop - Google Patents
Method for aligning lithium battery winding tab with closed loop Download PDFInfo
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- 238000004804 winding Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 32
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 18
- 239000011159 matrix material Substances 0.000 claims description 32
- 238000012887 quadratic function Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 102100029469 WD repeat and HMG-box DNA-binding protein 1 Human genes 0.000 description 1
- 101710097421 WD repeat and HMG-box DNA-binding protein 1 Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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- G06T7/60—Analysis of geometric attributes
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to the field of lithium battery winding, in particular to a method for aligning a lithium battery winding tab to a closed loop, which comprises the following steps: step one: acquiring a tab side image after material winding, wherein the tab area is acquired by acquiring the side image, and the second step is that: generating a set detection area; step three: performing binarization operation in the generated detection area to obtain all the areas of the suspected polar lugs; the binarization operation is to compare the gray value of each pixel in the image with a specific threshold value, if the gray value of the pixel is larger than or equal to the threshold value, the pixel is set to be 1, otherwise, the gray value is set to be 0, all pixels with the gray value larger than or equal to the threshold value in the image are assigned to be 1, and pixels with the gray value smaller than the threshold value are assigned to be 0.
Description
Technical Field
The invention relates to the field of lithium battery winding, in particular to a method for aligning a lithium battery winding tab with a closed loop.
Background
Typical lithium ion battery manufacturing processes can be generally divided into three major processes (the following figures): electrode manufacturing, assembly process and cell detection, but it can also be divided into two major processes: the demarcation point is the winding process, which is characterized in that the winding process has a strong integration function, so that the appearance of the battery is exposed initially, the winding process plays the role of a hub in the manufacturing process of the lithium ion battery, the winding process is a key process in the manufacturing process of the lithium ion battery, and a winding core produced by the winding process is generally called a bare cell;
in the winding process of the lithium battery, due to the fact that the thickness of the material is uneven and the spacing between the electrode lugs is in tolerance, the problem that the electrode lugs cannot be aligned at the same position any more and misplacement occurs after the winding process of the electrode lugs.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the technical problems by adopting the following technical scheme: the invention discloses a method for aligning a lithium battery winding tab with a closed loop, which comprises the following steps:
Step one: and acquiring a side image of the tab after the material is wound, wherein the tab area is acquired by acquiring the side image.
Step two: generating a set detection area;
Step three: performing binarization operation in the generated detection area to obtain all the areas of the suspected polar lugs;
The binarization operation is to compare the gray value of each pixel in the image with a specific threshold value, and if the gray value of the pixel is greater than or equal to the threshold value, the value of the pixel is set to 1, otherwise, the value is set to 0. Thus, all pixels in the image having a gray value greater than or equal to the threshold are assigned a1, while pixels having a gray value less than the threshold are assigned a 0.
Step four: converting the suspected region into a plurality of regions according to the mode of communicating the regions;
The connected domain is to find out and mark the adjacent pixels with the same pixel value.
Step five: finding out the area with the largest area in all the connected areas as a tab area;
step six: generating a detection area of the lower half part of the tab through the minimum circumscribed rectangle of the tab;
The minimum circumscribed rectangle of the electrode lug is the minimum rectangle for finding and surrounding the point set, the rectangle is characterized in that the edge of the rectangle passes through certain points on the point set as if a rectangle wire netting is given, and then the rectangle is cut on the point set by hands so that the edge of the rectangle just passes through certain points on the point set, and the obtained rectangle is the minimum circumscribed rectangle.
Step seven: subtracting the tab detection area of the lower half part of the tab from the tab area to obtain areas on two sides of the tab;
Step eight: and judging the area of the left and right areas, namely judging the direction of the dislocation of the tab, if the direction of the dislocation of the tab is left, storing the leftmost coordinates of each row of the tab area, if the direction of the dislocation of the tab is right, storing the rightmost coordinates of each row of the tab area, wherein the array of the stored row coordinates is ArrayX, and the array of the stored column coordinates is ArrayY.
Then, a matrix with the number of lines being ArrayX and the number of columns being 1 is created by utilizing the stored array of the line coordinates, the matrix is named MatrixCo, and the value of each line is ArrayX which corresponds to the serial number;
The array of the stored row coordinates is used for creating a matrix with the number of lines being ArrayX and the number of columns being 1, the matrix is named MatrixCo, and the value of each row is the square of the value of the corresponding serial number of ArrayX;
The array of the stored row coordinates is used for creating a matrix with the number of lines being ArrayX and the number of columns being 3, the matrix is named MatrixA, the first column of the matrix is replaced by MatrixCo, and the second column of the matrix is replaced by MatrixCo;
the stored column coordinate array is used for creating a matrix with the number of lines being ArrayY and the number of columns being 1, the matrix is named MatrixB, and the value of each line is ArrayY which corresponds to the serial number.
The solution to MatrixA to MatrixB is named MatrixX. MatrixX is a matrix with 3 rows and1 columns, where the value of the first row is the quadratic coefficient a of the quadratic function, the value of the second row is the quadratic coefficient B, and the third row is the constant quadratic coefficient C.
The radius of the reel after the material is wound in the first step is named as R, the thickness of the material is named as D, and the current error of the reel diameter isThrough the obtained quadratic function coefficient, the difference value of the lug distances between the Q layer material and the Q-1 layer material can be obtained as follows: /(I)The difference can be calculated by the roll diameter and the error as: Equal to each other, the formula can be obtained: 。
the current error of the rolling diameter is adjusted by adjusting the air pressure by using the winding machine The effect of the lug on the electrode can be achieved.
The beneficial effects of the invention are as follows:
In order to reduce the dislocation of the tabs, the winding diameter can be changed by adjusting the winding diameter of the winding needle in a closed loop, the tabs of each layer are positioned at the same position, the dislocation of the first tab and the whole tab and the winding position of the first tab are measured, the dislocation of the tabs is reduced by adjusting the winding position in a closed loop, the secondary function coefficient of tab alignment is obtained by shooting the end face of the tab, and the effect of tab alignment closed loop can be achieved by adjusting the roll diameter of the winding roll through the secondary function coefficient.
Drawings
FIG. 1 is a schematic flow diagram of the method of the present invention;
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description. The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
An example of a method for aligning and closing a tab for lithium battery winding according to an embodiment of the present invention will be described below with reference to fig. 1.
As shown in fig. 1, the method for aligning the lithium battery winding tab with the closed loop comprises the following steps:
step one: and acquiring a side image of the tab after the material is wound, and acquiring a tab area by acquiring the side image.
Step two: and generating a set detection area, wherein the detection area is used for acquiring all areas of the suspected lugs and judging the orientation of the dislocation of the lugs.
Step three: performing binarization operation in the generated detection area to obtain all the areas of the suspected polar lugs;
the binarization operation is to compare the gray value of each pixel in the image with a specific threshold value, and if the gray value of the pixel is greater than or equal to the threshold value, the value of the pixel is set to 1, otherwise, the value is set to 0. Thus, all pixels in the image having a gray value greater than or equal to the threshold are assigned a 1, while pixels having a gray value less than the threshold are assigned a 0.
Step four: converting the suspected region into a plurality of regions according to the mode of communicating the regions;
the connected domain is to find out and mark the adjacent pixels with the same pixel value.
Step five: finding out the area with the largest area in all the connected areas as a tab area;
step six: generating a detection area of the lower half part of the tab through the minimum circumscribed rectangle of the tab;
the minimum circumscribed rectangle of the electrode lug is the minimum rectangle for finding and enclosing the point set, the characteristic of the rectangle is that the edge of the rectangle passes through some points on the point set as if a rectangle wire netting is given, and then the rectangle is cut on the point set by hand so that the edge of the rectangle just passes through some points on the point set, and the obtained rectangle is the minimum circumscribed rectangle.
Step seven: subtracting the tab detection area of the lower half part of the tab from the tab area to obtain areas on two sides of the tab;
Step eight: and judging the area of the left and right areas, namely judging the direction of the dislocation of the tab, if the direction of the dislocation of the tab is left, storing the leftmost coordinates of each row of the tab area, if the direction of the dislocation of the tab is right, storing the rightmost coordinates of each row of the tab area, wherein the array of the stored row coordinates is ArrayX, and the array of the stored column coordinates is ArrayY.
Then, a matrix with the number of lines being ArrayX and the number of columns being 1 is created by utilizing the stored array of the line coordinates, the matrix is named MatrixCo, and the value of each line is ArrayX which corresponds to the serial number;
Creating a matrix with the number of lines being ArrayX and the number of columns being 1 by using the stored array of the line coordinates, naming the matrix as MatrixCo, and squaring the value of each line as ArrayX corresponding to the value of the serial number;
creating a matrix with the number of lines being ArrayX and the number of columns being 3 by using the stored array of the row coordinates, wherein the matrix is named MatrixA, the first column of the matrix is replaced by MatrixCo, and the second column of the matrix is replaced by MatrixCo;
And creating a matrix with the number of lines being ArrayY and the number of columns being 1 by using the stored column coordinate array, wherein the matrix is named MatrixB, and the value of each line is ArrayY which corresponds to the serial number.
The solutions MatrixA to MatrixB are designated MatrixX. MatrixX is a matrix with 3 rows and 1 columns, where the value of the first row is the quadratic coefficient a of the quadratic function, the value of the second row is the quadratic coefficient B, and the third row is the constant quadratic coefficient C.
The radius of the reel after the material is wound in the first step is named as R, the thickness of the material is named as D, and the current error of the reel diameter isThrough the obtained quadratic function coefficient, the difference value of the lug distances between the Q layer material and the Q-1 layer material can be obtained as follows: /(I)The difference can be calculated by the roll diameter and the error as: Equal to each other, the formula can be obtained: 。
current error of rolling diameter is regulated by regulating air pressure by utilizing rolling machine The effect of the lug on the electrode can be achieved.
When the tab alignment closed loop operation is performed, firstly, acquiring a tab side image after material winding, generating a set detection area, performing binarization operation on the detection area, acquiring all regions of suspected tabs, converting the regions into a plurality of regions according to a connected region mode, taking the region with the largest area as a tab region, generating a tab lower half detection region by utilizing a tab minimum circumscribed rectangle, subtracting the tab detection region and the tab region at the tab lower half to obtain regions at two sides of the tab, judging the area of the regions at the two sides, namely judging the direction of tab dislocation, selecting the direction of the region with the large area as the direction of tab dislocation, if the direction of tab dislocation is left, saving the leftmost coordinates of each row of the tab region, if the direction of tab dislocation is right, saving the rightmost coordinates of each row of the tab region, and obtaining by utilizing two calculation formulas of the difference value of tab distance between a Q layer and a Q-1 layer materialAnd then the roll diameter is adjusted by adjusting the air pressure, so that the effect of aligning the tabs can be achieved.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present invention without the inventive step, are intended to be within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.
Claims (6)
1. A method for aligning a lithium battery winding tab with a closed loop is characterized by comprising the following steps: the method comprises the following steps:
Step one: acquiring a lug side image after material winding;
Step two: generating a set detection area;
Step three: performing binarization operation in the generated detection area to obtain all the areas of the suspected polar lugs;
step four: converting the suspected region into a plurality of regions according to the mode of communicating the regions;
Step five: finding out the area with the largest area in all the connected areas as a tab area;
step six: generating a detection area of the lower half part of the tab through the minimum circumscribed rectangle of the tab;
Step seven: subtracting the tab detection area of the lower half part of the tab from the tab area to obtain areas on two sides of the tab;
Step eight: judging the area of the left and right areas, namely judging the direction of dislocation of the lugs;
A solution of MatrixA to MatrixB is named MatrixX, matrixX as a matrix with 3 rows and 1 columns, wherein the value of the first row is the quadratic term coefficient a of the quadratic function, the value of the second row is the quadratic term coefficient B, and the third row is the constant term coefficient C;
The radius of the reel after the material is wound in the first step is named as R, the thickness of the material is named as D, the current error of the reel diameter is named as R 0, and the difference value of the lug distances between the Q layer and the Q-1 layer material is obtained through the obtained quadratic function coefficient: a (Q) D-B 2-A*((Q-1)*D-B)2, the difference is calculated by roll diameter and error as: 2 (r+q+d) ×pi-2 (r+q+d+r 0) ×pi, equal to one another, yields the formula:
The effect of the tab on the winding diameter can be achieved by adjusting the current error R 0 of the winding diameter through the air pressure adjustment by using the winding machine.
2. The method for aligning a lithium battery winding tab to a closed loop according to claim 1, wherein the method comprises the following steps: in the eighth step, if the dislocation direction of the tab is left, the leftmost coordinates of each row of the tab area are saved, and if the dislocation direction of the tab is right, the rightmost coordinates of each row of the tab area are saved, the array of the saved row coordinates is ArrayX, and the array of the saved column coordinates is ArrayY.
3. The method for aligning a lithium battery winding tab to a closed loop according to claim 1, wherein the method comprises the following steps: and creating a matrix with the number of lines being ArrayX and the number of columns being 1 by using the stored array of the line coordinates, wherein the matrix is named MatrixCo, and the value of each line is ArrayX which corresponds to the serial number.
4. The method for aligning a lithium battery winding tab to a closed loop according to claim 1, wherein the method comprises the following steps: a matrix with the number of lines being ArrayX and the number of columns being 1 is created by using the stored array of the line coordinates, and is named MatrixCo, and the value of each line is ArrayX which corresponds to the square of the value of the serial number.
5. The method for aligning a lithium battery winding tab to a closed loop according to claim 1, wherein the method comprises the following steps: a matrix with the number of lines ArrayX and the number of columns 3 is created by using the stored array of row coordinates, the matrix is named MatrixA, the first column of the matrix is replaced by MatrixCo, and the second column of the matrix is replaced by MatrixCo.
6. The method for aligning a lithium battery winding tab to a closed loop according to claim 1, wherein the method comprises the following steps: and creating a matrix with the number of lines being ArrayY and the number of columns being 1 by using the stored column coordinate array, wherein the matrix is named MatrixB, and the value of each line is ArrayY which corresponds to the serial number.
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| CN117333654A (en) * | 2023-09-25 | 2024-01-02 | 钛玛科（北京）工业科技有限公司 | Lithium battery tab alignment method, device, equipment and storage medium |
| CN117570852B (en) * | 2024-01-15 | 2024-03-26 | 钛玛科（北京）工业科技有限公司 | Method, device and equipment for detecting polar lug vertex coordinates |
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