CN218329771U - Detection mechanism and screen printing device - Google Patents

Abstract

A detection mechanism and a screen printing device belong to the technical field of solar cells. The screen printing device comprises a detection mechanism and a screen printing machine. And printing slurry in the laser heavily-doped region of the quadrilateral groove structure in the cell by using the screen printing machine to form a grid line. The detection mechanism comprises a first slide holder, an image acquisition assembly and an image processing assembly. The first slide holder is used for placing a battery piece, the image acquisition assembly comprises at least four cameras which are arranged opposite to the first slide holder, and the image processing assembly is in communication connection with the at least four cameras. The at least four cameras respectively shoot the grid lines at the four inner corners of the quadrilateral groove structure so as to simultaneously obtain real-time images of the grid lines at the four inner corners of the laser heavily doped region, the image processing assembly processes the real-time images, the alignment condition of the grid lines at the four inner corners and the laser heavily doped region is judged, and a detection result is obtained.

Description

Detection mechanism and screen printing device

Technical Field

The application relates to the technical field of solar cells, in particular to a detection mechanism and a screen printing device.

Background

Screen printing is an important process in the production of solar cells. In the preparation process of the solar cell, a heavily doped region needs to be formed at a cell through an SE (selective emitter) process, and then a grid line needs to be printed in the heavily doped region through a screen printing process.

However, during the screen printing process, four printing pastes are not printed on the heavily doped region formed in the SE process, which results in the degradation of the cell failure. Therefore, in the prior art, an operator needs to perform a test at regular time to check the offset alignment condition of the gate line and the heavily doped region. However, the method cannot find the shift condition timely and effectively, the risk of mass shift is high, and mass degradation may occur when the shift condition is found, which affects the production yield.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings, the present application provides a detection mechanism and a screen printing apparatus to partially or completely improve, or even solve, the problem of the shift of the grid line in the related art.

The application is realized as follows:

in a first aspect, examples of the present application provide a detection mechanism, configured to detect a position alignment condition between a grid line of a cell and a laser doping area; the laser doping area is of a quadrilateral groove structure; the detection mechanism includes:

the device comprises an image acquisition assembly, an image processing assembly and a first slide holder;

the first slide holder is used for placing a battery piece;

the image acquisition assembly comprises at least four cameras, and the at least four cameras are arranged opposite to the first slide holder; the at least four cameras are respectively used for acquiring real-time images of the grid lines at the four inner corners of the quadrilateral groove structure;

the image processing assembly is in communication connection with at least four cameras.

In the implementation process, at least four cameras and a first film carrying table used for placing the battery piece are arranged oppositely, and the battery piece at the first film carrying table is shot by the at least four cameras so as to obtain real-time images of grid lines at four inner corners of the quadrilateral groove structure in the battery piece.

The image processing assembly is in communication connection with at least four cameras to process images of the grid lines at the four inner corners acquired by the four cameras, the contraposition conditions of the grid lines at the four inner corners are judged, and then the detection result of whether the grid lines of the battery piece deviate or not is obtained.

With reference to the first aspect, in a first possible implementation manner of the first aspect of the present application, the image capturing assembly further includes at least four magnifying glasses in one-to-one correspondence with the at least four cameras, and each camera acquires a real-time image through the magnifying glasses.

In the above-mentioned implementation process, set up a magnifying glass in each camera department, enlarge the grid line of four inner corners departments of quadrangle groove structure through the magnifying glass, recycle the camera and shoot the image after enlarging, can improve real-time image's magnification and definition, improve the counterpoint detection precision of grid line in four inner corners departments.

With reference to the first aspect, in a second possible implementation manner of the first aspect of the present application, the detection mechanism further includes an alarm component, and the alarm component is connected to the image processing component in a communication manner; when the grid line in the real-time image exceeds the edge of the quadrilateral groove structure by a preset distance, the alarm assembly gives an abnormal alarm.

In the implementation process, the alarm assembly is in communication connection with the image processing assembly, and when the grid line in the real-time image acquired by the image processing assembly exceeds the edge of the quadrilateral groove structure by a preset distance, the alarm assembly can give an abnormal alarm, so that an operator can adjust the grid line printing process in time, and a large number of bad silicon wafers are avoided.

With reference to the first aspect, in a third possible implementation manner of the first aspect of the present application, the preset distance is not less than 1mm.

In the implementation process, when the grid line in the real-time image exceeds the edge of the quadrilateral groove structure by 1mm and above, the alarm assembly can give an abnormal alarm, so that an operator can adjust the grid line printing process in time, and the false alarm of the alarm assembly is avoided.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect of the present application, the detection mechanism further includes a light source, and the light source is configured to illuminate the gate line.

In the implementation process, the light source is arranged in the detection mechanism, the light source is used for irradiating the grid line in the battery piece, the definition of a real-time image obtained by shooting through a camera in the image acquisition assembly can be improved, and the detection precision of the detection mechanism can be further improved.

With reference to the first aspect, in a fifth possible implementation manner of the first aspect of the present application, the detection mechanism further includes a mounting plate disposed opposite to the first stage, and the at least four cameras are disposed at intervals along a circumferential direction of the mounting plate;

the light source is arranged on the mounting plate and is positioned among the at least four cameras.

In the implementation process, the mounting plate is arranged at the relative position of the first slide holder, and the four cameras are arranged at intervals along the axial direction of the mounting plate, so that the four cameras can be opposite to four inner corners of the quadrilateral groove structure respectively, and the four cameras can be fixed conveniently. And, set up the light source between four cameras, can utilize the even four cameras of carrying out the light filling for of same light source, can reduce the installation convenience of the quantity that sets up of light source and improvement light source.

With reference to the first aspect, in a sixth possible implementation manner of the first aspect of the present application, the first wafer stage includes a wafer loading portion and a limiting portion, and the wafer loading portion and the limiting portion form a receiving area for a battery wafer; the limiting part is movably connected with the carrying piece part so as to adjust the size of the accommodating area;

at least four cameras are movably connected with the mounting plate.

In the implementation process, the first wafer carrying table is provided with the wafer carrying part and the limiting part to form a containing space of the battery wafer, so that an operator can place the battery wafer printed with the grid line in the same placing area at every time, and further, the implementation images of four corners of the grid line cannot be acquired by four cameras due to the fact that the deviation of the positions of the battery wafer is placed at every time are avoided, and further, the angle adjustment flow of the four cameras is reduced.

And, with at least four cameras and mounting panel swing joint, can be convenient for operating personnel adjusts the relative position of four cameras and first slide holder to the detection of the battery piece of adaptation different sizes.

In a second aspect, examples of the present application provide a screen printing apparatus including: the screen printing mechanism and the detecting mechanism provided by the first aspect; the detection mechanism is used for shooting the battery piece printed by the screen printing mechanism so as to obtain a real-time image.

In the implementation process, after the screen printing mechanism is used for printing the grid lines of the battery piece, the detection mechanism is used for shooting the printed battery piece so as to detect the alignment condition of the grid lines in the battery piece printed by the screen printing mechanism, so that an operator can adjust the printing area in the screen printing machine in time according to the detection result, and the generation of a large number of bad battery pieces is avoided.

With reference to the second aspect, in a first possible embodiment of the second aspect of the present application, the screen printing apparatus further includes a second stage and a conveying mechanism; the second slide holder is used for placing the battery piece to be subjected to grid line printing, and the conveying mechanism is used for placing the battery piece on the first slide holder.

In the implementation process, a second slide holder is arranged in the screen printing device, so that the battery piece without the printed grid line is placed in the second slide holder for screen printing. And be provided with conveying mechanism, can carry the battery piece after the printing of second slide holder department to first slide holder department, in time carry out the counterpoint condition detection of battery piece printing grid line, and then can in time adjust the position of second slide holder, avoid continuing to print and obtain bad battery piece.

In a second possible embodiment of the second aspect of the present application, in combination with the second aspect, the conveying mechanism includes a suction cup for sucking the battery piece and a driving member for driving the suction cup to move to and from the first stage and the second stage.

In the implementation process, the battery piece is adsorbed by the sucking disc, and the battery piece is transferred between the second piece carrying platform and the first piece carrying platform. Namely, after the second slide holder is printed, the battery piece is adsorbed by the sucker and placed on the first slide holder for grid line detection; when the battery piece at the first wafer carrying platform is detected and judged to be bad, the sucking disc adsorbs the battery piece at the first wafer carrying platform and is placed on the second wafer carrying platform, so that grid lines can be printed again, and the yield of the battery piece obtained by printing in the screen printing device is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the prior art of the present application, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic plan view of a screen printing apparatus provided as an example of the present application;

FIG. 2 is a schematic plan view of a first stage;

fig. 3 is a schematic plan view of an image capture assembly provided in an example of the present application.

An icon: 1-screen printing device; 10-a detection mechanism; 11-a first slide stage; 111-a carrier part; 112-a limiting part; 12-an image acquisition component; 121-a camera; 122-a mounting plate; 123-a magnifying glass; 124-a light source; 13-an image processing component; 14-an alarm component; 20-screen printing machine; 21-a second slide holder; 30-a conveying mechanism; 31-a suction cup; 32-a drive member.

Detailed Description

Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.

The following is a detailed description of the detection mechanism and the screen printing apparatus provided in the examples of the present application:

screen printing is an important process in the production of solar cells. In the preparation process of the solar cell, a heavily doped region needs to be formed at a cell piece through an SE (selective emitter) process, and then a grid line is printed and formed in the heavily doped region through a screen printing process. The heavily doped region is a quadrilateral groove structure, and the grid line is positioned in the quadrilateral groove structure.

However, the inventors have found that with existing screen printers, a large number of defective battery pieces occur. Wherein, a large number of bad battery pieces with grid lines not printed in the heavily doped region can appear. In the screen printing process, the condition that four printing pastes are not printed on the heavily doped region formed in the SE procedure can occur, and the failure degradation of the battery plate is caused.

In order to check the grid line deviation condition of the battery piece, an operator needs to perform periodic sampling test. However, the method cannot timely and effectively find the offset condition, the risk of mass offset is high, and mass degradation may occur when the offset condition is found, which affects the production yield.

Based on this, referring to fig. 1, the inventors provide a screen printing apparatus 1 and a detecting mechanism 10. The screen printing apparatus 1 includes a detection mechanism 10 and a screen printer 20. The detection mechanism 10 includes a first stage 11, an image capturing assembly 12, and an image processing assembly 13. The image capturing assembly 12 includes at least four cameras 121, and the at least four cameras 121 are disposed opposite to the first stage 11. The image processing assembly 13 is communicatively coupled to at least four cameras 121 in the image capturing assembly 12.

When the cell is required to be printed by the screen printing device 1, the paste is printed in the laser heavily doped region of the quadrilateral groove structure of the cell by the screen printing machine 20 to form a grid line. Then, the printed battery piece is placed at a first chip carrying table 11 in the detection mechanism 10, and at least four cameras 121 arranged opposite to the first chip carrying table 11 are used for respectively shooting the printing grid lines at the four inner corners of the quadrilateral groove structure, so that real-time images of the printing grid lines at the four inner corners of the laser heavily doped region are obtained simultaneously. And then, processing the real-time image by using an image processing assembly 13 in the detection mechanism 10, and judging the alignment condition of the grid lines at the four inner corners and the laser heavily doped region to obtain a detection result.

By using the detection mechanism 10 provided by the example, the battery pieces after the grid lines are printed can be detected in time, and the probability of generation of large-batch bad battery pieces can be reduced. The detection mechanism 10 provided by the example can simultaneously acquire the grid line images at the four inner corners by using the at least four cameras 121, and when the grid line at one of the inner corners exceeds the edge of the laser heavily doped region, the deviation of the grid line can be judged, so that the detection accuracy of the grid line alignment condition is improved.

The first stage 11, the image capturing assembly 12, and the image processing assembly 13 of the inspection mechanism 10 provided in the present application are further described in detail below with reference to the accompanying drawings.

The first slide holder 11 is used for placing a battery piece to be subjected to grid line alignment condition detection, so that a real-time image of the grid lines in the battery piece can be acquired by the image acquisition assembly 12.

The specific arrangement form of the first slide holder 11 is not limited by the present application, and relevant personnel can perform corresponding adjustment according to needs.

In some possible embodiments, the first stage 11 is a flat plate structure. The battery piece is placed on the first slide holder 11 with a flat structure, and the back surface of the battery piece is in contact with the first slide holder 11 (the back surface refers to the surface opposite to the surface provided with the printed grid lines).

Or, first slide stage 11 is groove structure, wherein groove structure's tank bottom is used for placing the battery piece, groove structure's cell wall is used for spacing the battery piece, when preventing to place the battery piece at every turn, because deviation in the operation leads to the battery piece to take place the skew in the position of first slide stage 11 department, and then can prevent four at least cameras 121 in image acquisition subassembly 12, can't carry out the condition of shooing to the position of angle department to four of grid line in the battery piece of first slide stage 11 department, and then avoid because the battery piece places the position change and influence detection mechanism 10's detection precision.

Alternatively, the first stage 11 includes a rectangular carrier piece portion 111 and a frame-shaped stopper portion 112. The limiting part 112 can move along the width direction and the length direction of the carrying piece part 111 to adapt to the placement of battery pieces with different sizes. Further, a ruler may be further disposed at a connection position of the position limiting portion 112 and the carrying sheet portion 111 to mark a moving distance of the position limiting portion 112 along a width direction or a length direction of the carrying sheet portion 111, so as to adapt to battery sheets with different sizes and adjust positions of the four cameras 121 in the image capturing assembly 12 according to size changes of the battery sheets.

Referring to fig. 2, in a possible embodiment, the supporting plate 111 is a flat plate structure, and the limiting portion 112 may include two L-shaped limiting blocks. The two L-shaped limiting blocks are respectively and oppositely arranged along the diagonal of the flat plate structure so as to limit two corners of the battery piece along the diagonal. In order to adjust the distance between the two limiting blocks along the diagonal direction, a slide rail may be disposed on one diagonal line of the upper surface of the sheet-carrying portion 111 of the flat plate structure, and scale marks may be disposed on the slide rail. The two limiting blocks are connected with the sliding rail in a sliding mode, and pointers pointing to the scale marks are arranged at the limiting blocks. Further, in order to avoid the slide rail from affecting the placement of the battery piece, the slide rail may be embedded in the flat plate of the carrying piece portion 111, so that the top of the slide rail does not protrude out of the flat plate for contacting the upper surface of the battery piece. Or a support table is arranged in the middle of the two L-shaped limit blocks, and two diagonal edges of the battery piece along the diagonal line are placed at the support table to prevent the battery piece from contacting with the slide rail.

The image acquisition assembly 12 is used for acquiring real-time images of four corners of grid lines in the battery piece placed at the first slide holder 11. The image capturing assembly 12 includes at least four cameras 121, and the at least four cameras 121 are respectively used for capturing images at four corners of the gate line.

The application does not limit the specific setting form of the image acquisition assembly 12, and relevant personnel can make corresponding adjustment according to the needs.

In some possible embodiments, to facilitate the mounting and positioning of the camera 121, the image acquisition assembly 12 further includes a mounting plate 122. Referring to fig. 1 and 3, the mounting plate 122 is disposed opposite to the first slide stage 11. At least four cameras 121 are disposed at intervals along the circumference of the mounting board 122 to correspond to the four inner corners of the laser heavily doped region, respectively.

Further, to facilitate adjusting the positions of the four cameras 121 according to the size change of the battery cell, in some possible embodiments, the four cameras 121 are movably connected to the mounting plate 122.

Further, in order to facilitate the movement of the four cameras 121 along the mounting plate 122, in some possible embodiments, sliding rails may be disposed at two diagonal lines of the mounting plate 122, and the four cameras 121 are respectively connected to the sliding rails in a sliding manner. Furthermore, scale marks may be further disposed on the slide rail to mark the sliding distance of the camera 121. Alternatively, a plurality of mounting holes may be provided at diagonal intervals on the mounting plate, and the camera 121 may be selectively fixed at different mounting holes.

The present application does not limit how the mounting plate 122 is disposed opposite the first stage 11, and in some possible embodiments, the inspection mechanism 10 further includes a frame. The rack has two mounting positions opposite to each other up and down so as to facilitate the relative arrangement of the first stage 11 and the mounting plate 122.

In order to further improve the definition of the real-time images captured by the four cameras 121 at high magnification to improve the detection accuracy. In one possible embodiment, the image capturing assembly 12 further comprises a plurality of magnifying lenses 123 in one-to-one correspondence with the cameras 121. The magnifier 123 is disposed between the first stage 11 and the cameras 121, and each camera 121 obtains magnified images at four corners of the gate line through the magnifier 123.

The application does not limit how the magnifier 123 is arranged between the first slide stage 11 and the camera 121, and relevant personnel can perform corresponding adjustment according to needs. In some possible embodiments, the detection mechanism 10 further comprises a second mounting plate. The detecting mechanism 10 may include a frame, and the first slide holder 11, the second mounting plate, and the mounting plate 122 are fixed from bottom to top in sequence. The second mounting plate is provided with four mounting holes penetrating through the upper and lower surfaces thereof at intervals, and the four cameras 121 are respectively in a position relation with the four mounting holes in a vertical opposite manner. The four magnifying lenses 123 are respectively embedded in different mounting holes.

Or, the mounting plate 122 is provided with four annular hollow supports at the slide rail for mounting the camera 121, and the four magnifying lenses 123 are respectively embedded in the four hollow annular supports, so that the camera 121 and the magnifying lenses 123 can be adjusted at the same time to adapt to the detection of the battery pieces with different sizes.

In order to further improve the definition of the real-time images captured by the four cameras 121, so as to improve the detection accuracy, in a possible embodiment, the image capturing assembly 12 further includes a light source 124. When shooting the battery piece, light can be supplemented by the light source 124.

The present application does not limit the specific arrangement of the light source, and in some possible embodiments, referring to fig. 3, the light source 124 may be an aperture structure. The light source 124 of the aperture structure is disposed on the mounting plate 122 and located between the four cameras 121.

The light source 124 is disposed between the four cameras 121, so that the four cameras 121 can be uniformly supplemented with light from the same light source 124, the number of the light sources 124 can be reduced, and the installation convenience of the light sources 124 can be improved.

Alternatively, four light sources 124 may be provided at four opposite corners of the first stage 11.

The image processing module 13 is communicatively connected to at least four cameras 121 to simultaneously obtain real-time images at four diagonal positions of the grid line. The image processing assembly 13 has a standard image, and the gate lines in the standard image are located in the laser heavily doped region of the quadrilateral groove structure. The image processing unit 13 compares the standard image with the real-time image, and determines whether the grid line has a print offset.

The present application does not limit how the image processing component 13 is communicatively coupled to at least four cameras 121, and in some possible embodiments, please continue to refer to fig. 1, the image processing component 13 and the cameras 121 may be coupled by data lines. Alternatively, the image processing assembly 13 may be communicatively coupled to at least four cameras 121 via a wireless connection.

The present application does not limit the specific arrangement of the image processing component 13, and in some possible embodiments, the image processing component 13 further includes a display screen for simultaneously displaying four real-time images. The image processing assembly 13 can calculate through the non-coincident region of the real-time image and the standard image, recognize the abnormal degree through the respective characteristics, and the operator can also set the preset distance that the grid line exceeds the edge of the quadrilateral groove structure, when the abnormal number exceeds the preset distance, the abnormal number is classified as an unqualified product to be processed, and if the abnormal number is lower than the preset distance, the abnormal number is regarded as a qualified product, so that the normal operation of production is ensured.

Further, in order to timely remind the abnormal condition of the battery piece, the detection mechanism 10 further comprises an alarm component 14. The alarm assembly 14 is in communication connection with the image processing assembly 13, and when the grid line in the real-time image exceeds the edge of the inner corner of the quadrilateral groove structure by a preset distance, the alarm assembly 14 gives an abnormal alarm.

The application does not limit the specific arrangement of the alarm assembly 14, and in some possible embodiments, the alarm assembly 14 includes a warning light and a buzzer.

The screen printing device 1 further comprises a screen printer 20 for printing the slurry on the laser heavily doped region of the cell to form a grid line.

The present application is not limited to the specific configuration of the screen printer 20, and the relevant person may make a corresponding selection as necessary.

In some possible embodiments, the screen printing machine 20 includes a second stage 21 for placing the battery pieces and performing grid line printing, a doctor blade assembly disposed opposite the second stage 21, and a slurry injection assembly for delivering slurry.

In order to facilitate the transfer of the printed battery piece at the second stage 21 to the first stage 11 for the detection of the battery piece, in one possible embodiment, the screen printing apparatus 1 further comprises a conveying mechanism 30.

While the present application is not limited to the specific configuration of the conveying mechanism 30, in some possible embodiments, with continued reference to fig. 1, the conveying mechanism 30 includes a suction cup 31 and a driving member 32 for driving the suction cup 31 to and from the first stage 11 and the second stage 21. Drive 32 may comprise a pneumatic cylinder. Further, in order to facilitate the suction cups 31 to approach and move away from the first stage 11 and approach and move away from the second stage 21, the driving member 32 may further include a lifter. Further, the lifter may include a motor, a lead screw, and a guide post. When the motor drives the screw rod to rotate forward and backward respectively, the suction cup 31 can move back and forth along the axial direction of the screw rod, and further approach or move away from the first slide holder 11 and the second slide holder 21.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A detection mechanism is used for detecting the alignment condition of a grid line of a cell and a laser doping area; the laser doping area is of a quadrilateral groove structure; characterized in that, detection mechanism includes: the device comprises an image acquisition assembly, an image processing assembly and a first slide holder;

the first slide holder is used for placing the battery piece;

the image acquisition assembly comprises at least four cameras, and the at least four cameras are arranged opposite to the first slide holder; the at least four cameras are respectively used for acquiring real-time images of the grid lines at four inner corners of the quadrilateral groove structure;

the image processing assembly is in communication connection with at least four cameras and is used for processing the real-time images.

2. The detection mechanism of claim 1, wherein the image capture assembly further comprises at least four magnifiers in one-to-one correspondence with the at least four cameras, each camera capturing the real-time image through the magnifiers.

3. The detection mechanism according to claim 1, further comprising an alarm component, wherein the alarm component is in communication with the image processing component; and when the grid line in the real-time image exceeds the edge of the quadrilateral groove structure by a preset distance, the alarm assembly gives an abnormal alarm.

4. The sensing mechanism of claim 3, wherein the predetermined distance is not less than 1mm.

5. The sensing mechanism of claim 1, further comprising a light source for illuminating the grid line.

6. The inspection mechanism of claim 5, further comprising a mounting plate disposed opposite the first stage, wherein at least four of the cameras are spaced circumferentially of the mounting plate;

the light source set up in the mounting panel, just the light source is located four at least between the camera.

7. The detecting mechanism according to claim 6, wherein the first wafer stage includes a wafer-carrying portion and a position-limiting portion, the wafer-carrying portion and the position-limiting portion forming a containing area of the battery wafer; the limiting part is movably connected with the carrying piece part so as to adjust the size of the accommodating area;

at least four cameras with mounting panel swing joint.

8. A screen printing apparatus characterized by comprising: a screen printing mechanism and a detection mechanism according to any one of claims 1 to 7; the detection mechanism is used for shooting the battery piece printed by the screen printing mechanism so as to obtain the real-time image.

9. The screen printing apparatus according to claim 8, further comprising a second stage and a conveying mechanism; the second slide holder is used for placing a battery piece to be subjected to grid line printing, and the conveying mechanism is used for placing the battery piece on the first slide holder.

10. The screen printing apparatus according to claim 9, wherein the conveying mechanism includes a suction cup for sucking the battery piece and a driving member for driving the suction cup to reciprocate to the first stage and the second stage.

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