Pole piece detection method, control device, system and computer readable storage medium

Abstract

The invention relates to the technical field of battery detection, and discloses a pole piece detection method, a control device, a system and a computer readable storage medium. The pole piece detection method comprises the following steps: acquiring first position data between a first pole piece and a first mark point; moving the first pole piece, and after the second pole piece is stacked on the first pole piece, acquiring second position data between the second pole piece and the second mark point; processing based on the first position data and the second position data to obtain size data between the first pole piece and the second pole piece; and detecting a lamination group formed by the first pole piece and the second pole piece according to the size data. The distance between the edge of the first pole piece and the edge of the second pole piece is detected through the two mark points, due to the fact that the positions of the mark points are different, the detection accuracy is high, the detection accuracy is improved, and the deviation requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a pole piece detection method, a control device, a system and a computer-readable storage medium. Background Art

[0002] In the manufacturing process of lithium-ion batteries, the distance between the edge of the positive electrode and the edge of the negative electrode is one of the most important parameters. Precise control of this distance is crucial to ensuring battery safety, improving energy density and extending service life.

[0003] The traditional method for detecting the distance between the edge of the positive electrode sheet and the edge of the negative electrode sheet is: when stacking the sheets, first detect the distance between the edge of the diaphragm and the edge of the negative electrode sheet and the distance between the diaphragm and the edge of the positive electrode sheet and the edge of the negative electrode sheet, and then obtain the distance between the edge of the positive electrode sheet and the edge of the negative electrode sheet by the difference between these two distances.

[0004] Due to the characteristics of the diaphragm itself, there may be wrinkles and deformations, and the stability of grabbing the edge of the diaphragm is very poor, which causes a large deviation in the calculated distance between the edge of the positive electrode sheet and the edge of the negative electrode sheet, and the precision measurement is low. Summary of the invention

[0005] In view of this, the present invention provides a pole piece detection method, a control device, a system and a computer-readable storage medium to solve the problem of large deviation when calculating the distance between the edge of the positive pole piece and the edge of the negative pole piece by using the distance between the edge of the diaphragm and the edge of the positive and negative poles.

[0006] In a first aspect, the present invention provides a pole piece detection method, comprising: obtaining first position data between a first pole piece and a first marking point; moving the first pole piece, and after a second pole piece is stacked on the first pole piece, obtaining second position data between the second pole piece and a second marking point; processing based on the first position data and the second position data to obtain size data between the first pole piece and the second pole piece; and detecting a stacking group formed by the first pole piece and the second pole piece according to the size data.

[0007] In a second aspect, the present invention also provides a pole piece detection control device for controlling the above-mentioned pole piece detection method, the pole piece detection control device comprising: a first acquisition module for acquiring first position data between a first pole piece and a first marking point; a second acquisition module for moving the first pole piece, and acquiring second position data between the second pole piece and a second marking point after the second pole piece is stacked on the first pole piece; a processing module for performing processing based on the first position data and the second position data to obtain size data between the first pole piece and the second pole piece; and a detection module for detecting a stacking group formed by the first pole piece and the second pole piece according to the size data.

[0008] In the third aspect, the present invention also provides a pole piece detection system, comprising: a stacking table, movably arranged and having a first stacking position and a second stacking position; a first marking point, arranged close to the first stacking position; a second marking point, arranged close to the second stacking position; a mobile driving component, connected to the stacking table to drive the stacking table to move between the first stacking position and the second stacking position; a visual imaging component, used to image the first marking point and the first pole piece after placing the first pole piece, and to image the second marking point and the second pole piece after placing the second pole piece; a controller, communicatively connected to the mobile driving component and the visual imaging component, the controller storing computer instructions, and executing the above-mentioned pole piece detection method by executing the computer instructions.

[0009] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the above-mentioned pole piece detection method.

[0010] Beneficial effect: The distance between the edge of the first pole piece and the edge of the second pole piece is detected by two marking points. Due to the different positions of the marking points, the detection accuracy is high, the detection accuracy is improved, and the deviation requirements are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A schematic flow chart of a pole piece detection method according to an embodiment of the present invention;

[0013] Figure 2 for Figure 1 Schematic diagram of the principle of the pole piece detection method shown;

[0014] Figure 3 Schematic diagram of another pole piece detection method according to an embodiment of the present invention.

[0015] Description of reference numerals:

[0016] 1. The first pole piece;

[0017] 2. The second pole piece;

[0018] 3. The first marking point;

[0019] 4. The second marking point;

[0020] 5. Diaphragm. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0023] According to an embodiment of the present invention, in a first aspect, a pole piece detection method is provided, comprising:

[0024] Acquire first position data between the first pole piece 1 and the first marking point 3;

[0025] The first pole piece 1 is moved, and after the second pole piece 2 is stacked on the first pole piece 1, second position data between the second pole piece 2 and the second marking point 4 is acquired;

[0026] Processing is performed based on the first position data and the second position data to obtain dimension data between the first pole piece 1 and the second pole piece 2;

[0027] The lamination stack formed by the first pole piece 1 and the second pole piece 2 is detected according to the size data.

[0028] The pole piece detection method of this embodiment is applied to detect the distance between the edge of the first pole piece 1 and the edge of the second pole piece 2 through two marking points. Due to the different positions of the marking points, the detection accuracy is high, which improves the detection accuracy and meets the requirement of deviation ≤ 0.2.

[0029] The pole piece includes a current collector and an active material layer, and the active material layer is coated on the surface of the current collector. If the pole piece is a positive pole piece, the current collector material may be aluminum, and the active material layer material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. If the pole piece is a negative pole piece, the current collector material may be copper, and the active material layer material may be carbon or silicon, etc. The pole ear is the area on the pole piece that is not coated with the active material layer, and the pole ear is electrically connected to the pole piece, wherein the positive pole ear is electrically connected to the positive pole piece, and the negative pole ear is electrically connected to the negative pole piece.

[0030] Furthermore, one of the first pole sheet 1 and the second pole sheet 2 is a positive pole sheet, and the other is a negative pole sheet, and the pole sheets are stacked by negative pole sheets, positive pole sheets, negative pole sheets, and so on.

[0031] In one embodiment, the first marking point 3 and the second marking point 4 are both black and white checkered patterns, which are two-dimensional patterns composed of black squares and white squares, and the colors of adjacent squares are different. Exemplarily, the black and white checkered pattern can adopt a 2×2 square matrix, that is, the squares in the first row can be white squares and black squares in sequence, and the squares in the second row can be black squares and white squares in sequence.

[0032] In one embodiment, the first pole piece 1 has a first corner point, the first marking point 3 is set corresponding to the first corner point, and the first position data includes: a first lateral distance and a first longitudinal distance, the first lateral distance is the distance between the longitudinal side of the first pole piece 1 close to the first marking point 3 and the first marking point 3, and the first longitudinal distance is the distance between the lateral side of the first pole piece 1 close to the first marking point 3 and the first mark.

[0033] The first position data is obtained by calculating the lateral distance and the longitudinal distance of the first pole piece 1 relative to the first marking point 3. The first lateral distance and the first longitudinal distance can be quickly calculated based on the geometric coordinate relationship. The calculation process is simple and easier to implement. The task can be completed without complex hardware acceleration or high-performance processors, which helps to reduce costs.

[0034] In one embodiment, the second pole piece 2 has a second corner point corresponding to the position of the first corner point, the second marking point 4 is set corresponding to the second corner point, and the second position data includes: a second lateral distance and a second longitudinal distance, the second lateral distance is the distance between the longitudinal side of the second pole piece 2 close to the second marking point 4 and the second marking point 4, and the second longitudinal distance is the distance between the lateral side of the second pole piece 2 close to the second marking point 4 and the second mark.

[0035] The second position data is obtained by calculating the lateral distance and longitudinal distance of the second pole piece 2 relative to the second marking point 4. The second lateral distance and the second longitudinal distance can be quickly calculated based on the geometric coordinate relationship. The calculation process is simple and easier to implement. The task can be completed without complex hardware acceleration or high-performance processors, which helps to reduce costs.

[0036] When stacking the first pole piece 1, the first marking point 3 is used as a reference system to obtain the relative distance of the first pole piece 1 relative to the first marking point 3; when stacking the second pole piece 2, the second marking point 4 is used as a reference system to obtain the relative distance of the second pole piece 2 relative to the second marking point 4. The distance between the edge of the first pole piece 1 and the edge of the second pole piece 2 is obtained according to the relative distance of the first pole piece 1 relative to the first marking point 3 and the relative distance of the second pole piece 2 relative to the second marking point 4. Since the two marking points are fixed, the relative distance of the first pole piece 1 relative to the first marking point 3 and the relative distance of the second pole piece 2 relative to the second marking point 4 will not be affected by factors such as jitter, thereby improving the calculation accuracy.

[0037] Specifically, in Figure 2 and Figure 3 In the figure, the first pole piece 1 is arranged at the lower right of the first marking point 3, and the second pole piece 2 is arranged at the lower right of the second marking point 4. At this time, the first corner point is the upper left corner point of the first pole piece 1, and the second corner point is the upper left corner point of the second pole piece 2.

[0038] It can be understood that, in another embodiment, the first pole piece 1 is arranged at the lower left of the first marking point 3 , and the second pole piece 2 is arranged at the lower left of the second marking point 4 .

[0039] It should be noted that the positional relationship between the first pole piece 1 and the first marking point 3 is the same as the positional relationship between the second pole piece 2 and the second marking point 4 .

[0040] In one embodiment, the step of obtaining the first lateral distance and the first longitudinal distance includes:

[0041] Acquire a first detection image after placing the first pole piece 1; wherein the first detection image is an image obtained by photographing the edge of the first pole piece 1 and the first marking point 3;

[0042] Determine the longitudinal edge and transverse edge of the first pole piece 1 close to the first marking point 3 according to the first detection image; wherein, determine the edge point set of the first pole piece 1 based on the first detection image, and fit the longitudinal edge and transverse edge of the first pole piece 1 based on the edge point set of the first pole piece 1; for example, fit the edge straight line of the first pole piece 1 by Canny edge detection;

[0043] The first transverse distance and the second longitudinal distance are determined based on the longitudinal and transverse sides of the first pole piece 1 close to the first marking point 3 and the first marking point 3, that is, the vertical projection distance from the first marking point 3 to the longitudinal and transverse sides of the first pole piece 1 close to the first marking point 3 is calculated.

[0044] It should be noted that the first identification point is the 2×2 black and white square pattern described above, and the intersection of two black squares is used as the center of the first marking point 3. The physical coordinates of the corner points of the black and white square pattern can be determined by the corner point detection algorithm. Canny comes from the name of the inventor John F. Canny.

[0045] In one embodiment, the step of obtaining the second lateral distance and the second longitudinal distance comprises:

[0046] Acquire a second detection image after placing the second pole piece 2; wherein the second detection image is an image obtained by photographing the edge of the second pole piece 2 and the second marking point 4;

[0047] Determine the longitudinal edge and transverse edge of the second pole piece 2 close to the second marking point 4 according to the second detection image; wherein, determine the edge point set of the second pole piece 2 based on the second detection image, and fit the longitudinal edge and transverse edge of the second pole piece 2 based on the edge point set of the second pole piece 2; for example, fit the edge straight line of the second pole piece 2 by Canny edge detection;

[0048] The second lateral distance and the second longitudinal distance are determined based on the longitudinal and lateral sides of the second pole piece 2 close to the second marking point 4 and the second marking point 4, that is, the vertical projection distance from the second marking point 4 to the longitudinal and lateral sides of the second pole piece 2 close to the second marking point 4 is calculated.

[0049] It should be noted that the second identification point is the 2×2 black and white grid pattern described above, with the intersection of two black squares as the center of the second marking point 4. The physical coordinates of the corner points of the black and white grid pattern can be determined by a corner point detection algorithm. The corner point detection algorithm is a conventional algorithm in the prior art and will not be described in detail here.

[0050] In one embodiment, the dimension data includes a lateral spacing and a longitudinal spacing;

[0051] Based on the first position data and the second position data, the dimension data between the first pole piece 1 and the second pole piece 2 is obtained, including:

[0052] Determine the lateral spacing according to the first lateral distance a, the second lateral distance b, the third lateral distance between the first marking point 3 and the second marking point 4, and the lateral movement distance l;

[0053] The longitudinal spacing is determined based on the first longitudinal distance c, the second longitudinal distance d, and the third longitudinal distance f between the first marking point 3 and the second marking point 4.

[0054] The exact position of the target object can be more accurately calculated through the first lateral distance a, the second lateral distance b, the third lateral distance, the lateral movement distance l, the first longitudinal distance c, the second longitudinal distance d and the third longitudinal distance f, thereby improving the accuracy of the overall measurement.

[0055] Specifically, the transverse spacing is the sum of the difference between the third transverse distance and the transverse movement distance and the difference between the first transverse distance and the second transverse distance, that is, the transverse spacing = e-l + ba, and the longitudinal spacing is the sum of the difference between the second longitudinal distance and the second longitudinal distance and the third longitudinal distance, that is, the longitudinal spacing = f + dc. When the first pole piece is moved, there is no movement in the longitudinal direction, only in the transverse direction.

[0056] It should be noted that, when laminating, the lateral movement distance is preset, and the controller directly obtains the lateral movement distance l from the memory.

[0057] Furthermore, if Figure 2 As shown, the first marking point 3 and the second marking point 4 have the same ordinate and different abscissas, which facilitates calculation and simplifies the calculation process.

[0058] It is understandable that in another embodiment, if Figure 3 As shown, the ordinate of the first marking point 3 and the ordinate of the second marking point 4 are different.

[0059] It should be noted that in Figure 2 and Figure 3 In the figure, the horizontal direction refers to the X direction and the vertical direction refers to the Y direction.

[0060] In a second aspect, the present invention further provides a pole piece detection control device for controlling the pole piece detection method described above, the pole piece detection control device comprising:

[0061] A first acquisition module, used for acquiring first position data between the first pole piece 1 and the first marking point 3;

[0062] A second acquisition module is used for moving the first pole piece 1, and after the second pole piece 2 is stacked on the first pole piece 1, acquiring second position data between the second pole piece 2 and the second marking point 4;

[0063] A processing module, used for processing based on the first position data and the second position data to obtain the size data between the first pole piece 1 and the second pole piece 2;

[0064] The detection module is used to detect the laminated stack formed by the first pole piece 1 and the second pole piece 2 according to the size data.

[0065] The specific effects of the above-mentioned pole piece detection control device can be understood by referring to the above-mentioned pole piece detection method, which will not be repeated here.

[0066] In the third aspect, the present invention also provides a pole piece detection system, comprising: a stacking table, a first marking point 3, a second marking point 4, a mobile driving component, a visual imaging component and a controller, wherein the stacking table is movably arranged and has a first stacking position and a second stacking position; the first marking point 3 is arranged close to the first stacking position; the second marking point 4 is arranged close to the second stacking position; the mobile driving component is connected to the stacking table to drive the stacking table to move between the first stacking position and the second stacking position; the visual imaging component is used to image the first marking point 3 and the first pole piece 1 after placing the first pole piece 1 and to image the second marking point 4 and the second pole piece 2 after placing the second pole piece 2; the controller is communicatively connected with the mobile driving component and the visual imaging component, and computer instructions are stored in the controller, and the above-mentioned pole piece detection method is executed by executing the computer instructions.

[0067] Furthermore, the first marking point 3 and the second marking point 4 are fixedly arranged on the fixed part of the stacking machine. During stacking, after placing the first electrode 1, the first marking point 3 and the first electrode 1 are imaged by the visual imaging component, thereby obtaining a first detection image; then the stacking platform is moved, and then the second electrode 2 is placed, and the second marking point 4 and the second electrode 2 are imaged by the visual imaging component, thereby obtaining a second detection image. Among them, a diaphragm is arranged between the first electrode 1 and the second electrode 2, that is, after placing the first electrode 1, the diaphragm can be placed on the first electrode 1, and then the second electrode 2 can be placed on the diaphragm. The diaphragm serves as an insulating layer to prevent the short circuit inside the battery caused by the contact between the positive electrode and the negative electrode, and the diaphragm serves as a semi-permeable layer to prevent larger molecules from passing through and allow small charged ions to pass through.

[0068] In one embodiment, the visual imaging component includes a first visual imaging component and a second visual imaging component. The first visual imaging component images the first marking point 3 and the first pole piece 1, and the second visual imaging component images the second marking point 4 and the second pole piece 2. The first visual imaging component and the second visual imaging component are both cameras, etc.

[0069] It should be noted that the mobile driving component can adopt the structure of the existing technology, which will not be described in detail here.

[0070] In one embodiment, the processor may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), DSP, application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0071] In one embodiment, the memory is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs, non-transitory computer executable programs, and modules.

[0072] Further, the memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created by the processor, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0073] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the above-mentioned pole piece detection method.

[0074] Furthermore, the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (Flash Memory), a hard disk (HDD) or a solid-state drive (SSD), etc.; the storage medium may also include a combination of the above types of memory.

[0075] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A pole piece detection method, characterized in that: include: Acquiring first position data between the first pole piece (1) and the first marking point (3); The first pole piece (1) is moved, and after the second pole piece (2) is stacked on the first pole piece (1), second position data between the second pole piece (2) and a second marking point (4) is acquired; Processing the first position data and the second position data to obtain dimension data between the first pole piece (1) and the second pole piece (2); The lamination stack formed by the first pole piece (1) and the second pole piece (2) is detected according to the dimension data.

2. The pole piece detection method according to claim 1, characterized in that: The first pole piece (1) has a first corner point, the first marking point (3) is arranged corresponding to the first corner point, and the first position data comprises: a first transverse distance and a first longitudinal distance, the first transverse distance being the distance between a longitudinal side of the first pole piece (1) close to the first marking point (3) and the first marking point (3), and the first longitudinal distance being the distance between a transverse side of the first pole piece (1) close to the first marking point (3) and the first mark.

3. The pole piece detection method according to claim 2, characterized in that: The step of acquiring the first transverse distance and the first longitudinal distance comprises: Acquiring a first detection image after placing the first pole piece (1); Determining the longitudinal edge and the transverse edge of the first pole piece (1) close to the first marking point (3) according to the first detection image; The first transverse distance and the second longitudinal distance are determined based on the longitudinal side and the transverse side of the first pole piece (1) close to the first marking point (3) and the first marking point (3).

4. The pole piece detection method according to claim 2, characterized in that: The second pole piece (2) has a second corner point corresponding to the position of the first corner point, the second marking point (4) is arranged corresponding to the second corner point, and the second position data comprises: a second transverse distance and a second longitudinal distance, the second transverse distance being the distance between the longitudinal side of the second pole piece (2) close to the second marking point (4) and the second marking point (4), and the second longitudinal distance being the distance between the transverse side of the second pole piece (2) close to the second marking point (4) and the second mark.

5. The pole piece detection method according to claim 4, characterized in that: The step of acquiring the second transverse distance and the second longitudinal distance comprises: Acquiring a second detection image after placing the second pole piece (2); Determining the longitudinal edge and the transverse edge of the second pole piece (2) close to the second marking point (4) according to the second detection image; The second transverse distance and the second longitudinal distance are determined based on the longitudinal side and the transverse side of the second pole piece (2) close to the second marking point (4) and the second marking point (4).

6. The pole piece detection method according to claim 4, characterized in that: The dimension data includes a horizontal spacing and a vertical spacing; Based on the first position data and the second position data, the dimension data between the first pole piece (1) and the second pole piece (2) is obtained by processing, including: Determining the lateral spacing according to the first lateral distance, the second lateral distance, a third lateral distance between the first marking point (3) and the second marking point (4), and the lateral movement distance; The longitudinal spacing is determined based on the first longitudinal distance, the second longitudinal distance, and a third longitudinal distance between the first marking point (3) and the second marking point (4).

7. The pole piece detection method according to claim 6, characterized in that: The lateral spacing is the sum of the difference between the third lateral distance and the lateral movement distance and the difference between the first lateral distance and the second lateral distance, and the longitudinal spacing is the sum of the difference between the second longitudinal distance and the second longitudinal distance and the third longitudinal distance.

8. A pole piece detection control device, characterized in that: Used to control the pole piece detection method according to claim 1, the pole piece detection control device comprises: A first acquisition module, used for acquiring first position data between the first pole piece (1) and the first marking point (3); A second acquisition module, used for moving the first pole piece (1), and after the second pole piece (2) is stacked on the first pole piece (1), acquiring second position data between the second pole piece (2) and a second marking point (4); a processing module, used for processing based on the first position data and the second position data to obtain dimension data between the first pole piece (1) and the second pole piece (2); A detection module is used to detect the stack formed by the first pole piece (1) and the second pole piece (2) according to the size data.

9. A pole piece detection system, characterized in that: include: A stacking table, movably arranged and having a first stacking position and a second stacking position; A first marking point (3) is arranged close to the first stack position; A second marking point (4) is arranged close to the second stack position; A moving driving component connected to the stacking platform to drive the stacking platform to move between the first stacking position and the second stacking position; A visual imaging component, used for imaging the first marking point (3) and the first pole piece (1) after the first pole piece (1) is placed, and for imaging the second marking point (4) and the second pole piece (2) after the second pole piece (2) is placed; A controller is communicatively connected with the mobile driving component and the visual imaging component, wherein computer instructions are stored in the controller, and the pole piece detection method according to any one of claims 1 to 7 is executed by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the pole piece detection method according to any one of claims 1 to 7.

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