CN115639214A - Battery string detection method - Google Patents
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- CN115639214A CN115639214A CN202211191192.XA CN202211191192A CN115639214A CN 115639214 A CN115639214 A CN 115639214A CN 202211191192 A CN202211191192 A CN 202211191192A CN 115639214 A CN115639214 A CN 115639214A
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Abstract
The embodiment of the application relates to the field of photovoltaic cells, and provides a cell string detection method, which comprises the following steps: providing a battery string to be detected, wherein the battery string comprises a plurality of battery pieces, a plurality of welding spots are arranged on the battery pieces, and the adjacent battery pieces are electrically connected; acquiring an electroluminescence image and an appearance image of the battery string; performing image processing on the electroluminescence image to obtain a target battery piece, wherein the target battery piece is a battery piece with a target welding spot, and the target welding spot is a welding spot which is judged to be in insufficient welding with a welding strip based on the electroluminescence image; acquiring a target appearance image corresponding to the target battery piece from the appearance image; acquiring an enlarged image of a target welding spot based on the target appearance image; and judging the welding condition of the target welding spot based on the amplified image so as to improve the efficiency and the accuracy of detecting the virtual welding spot in the battery string.
Description
Technical Field
The embodiment of the application relates to the field of photovoltaic cells, in particular to a cell string detection method.
Background
Various defects may occur in the complicated production process flow of the solar cell, and the photoelectric conversion efficiency and the service life of the solar cell are seriously influenced. For example, a solar cell is mainly connected in series with welding points on the cell through a welding strip to form a cell string, and photo-generated current of each cell in the cell string is led to the outside of the cell through the welding strip, so that conversion from light energy to electric energy is realized; however, since the bonding window is narrow, a problem of cold joint is easily caused.
The defect detection method of the solar cell is mainly based on infrared image detection, such as Electroluminescence (EL). With the development of battery technology, the number of battery pieces in the existing battery string is large, and the number of welding points on the battery pieces is large, so that dark spots in an infrared image of the battery string may cover a plurality of welding points, and virtual welding points on the battery string cannot be accurately obtained. In addition, the battery string detection can be realized in a manual detection mode, the battery string can be observed by naked eyes, abnormal points are marked, but the manual detection speed is low, the detection time is long, and the requirements of high yield and high speed of the existing battery string assembly cannot be met.
Disclosure of Invention
The embodiment of the application provides a battery string detection method, so that the efficiency and the accuracy of detection of virtual welding spots in a battery string are improved.
According to some embodiments of the present application, in an aspect, there is provided a battery string detection method, including: providing a battery string to be detected, wherein the battery string comprises a plurality of battery pieces, a plurality of welding spots are arranged on the battery pieces, and the adjacent battery pieces are electrically connected; acquiring an electroluminescence image and an appearance image of the battery string; performing image processing on the electroluminescent image to obtain a target battery piece, wherein the target battery piece is a battery piece with a target welding spot, and the target welding spot is a welding spot which is determined based on the electroluminescent image and is in false welding with a welding strip; acquiring a target appearance image corresponding to the target battery piece from the appearance image; acquiring an amplified image of the target welding spot based on the target appearance image; and judging the welding condition of the target welding spot based on the amplified image.
In some embodiments, obtaining an electroluminescent image and an appearance image of a string of cells comprises: establishing a coordinate system, and acquiring the coordinate position of each battery piece in the battery string in the coordinate system, wherein the electroluminescent image and the appearance image both comprise coordinate information representing the coordinate position of each battery piece; the image processing of the electroluminescent image to obtain the target cell further comprises: acquiring target coordinate information of a target battery piece, wherein the target coordinate information represents a coordinate position of the target battery piece; acquiring a target appearance image corresponding to a target battery piece from the appearance image, wherein the target appearance image comprises: and acquiring a target appearance image corresponding to the target coordinate information in the appearance image based on the target coordinate information.
In some embodiments, the appearance image includes a front image and a back image; after the appearance image is acquired, the method further comprises the following steps: decomposing the front image into a plurality of first sub-images, wherein each first sub-image corresponds to the front surface of a battery piece and comprises coordinate information of the battery piece; and decomposing the back image into a plurality of second sub-images, wherein each second sub-image corresponds to the back of one cell, and each second sub-image comprises coordinate information of the cell.
In some embodiments, obtaining the target appearance image corresponding to the target coordinate information in the appearance image based on the target coordinate information includes: acquiring a first target image corresponding to the target coordinate information in the first sub-image; and acquiring a second target image corresponding to the target coordinate information in the second sub-image, wherein the second target image and the first target image form a target appearance image.
In some embodiments, a method of acquiring front and back images, comprising: providing a first light source to the front side of the battery string; acquiring a front image along a direction opposite to the front of the battery string; providing a second light source to the back of the battery string; and acquiring a back image along a direction opposite to the back of the battery string.
In some embodiments, the first light source illuminates in a direction perpendicular to the front side of the battery string and the second light source illuminates in a direction perpendicular to the back side of the battery string.
In some embodiments, obtaining an electroluminescent image of a battery string comprises: introducing a forward current which is 1-1.5 times of the open-circuit current into the battery string; and acquiring an electroluminescence image represented by infrared light with the wavelength range of 1000-1100 nm emitted by the battery string.
In some embodiments, obtaining a magnified image of the target weld point based on the target appearance image comprises: acquiring the brightness value of each welding spot in the target appearance image; acquiring a target welding spot from the target appearance image based on the brightness value of the welding spot, wherein the brightness value of the target welding spot is greater than a preset brightness value; and acquiring an enlarged image of the target welding point from the target appearance image.
In some embodiments, the welding points on the adjacent battery plates are electrically connected through welding strips; based on the enlarged image, the welding condition of the target welding spot is judged, and the method comprises the following steps: acquiring the difference S1 between the actual area of a target welding spot and the orthographic projection area of a welding strip on the target welding spot; obtaining an exposed area S2 of the actual area of the target welding spot; if the ratio of S2/S1 is less than or equal to a preset value, judging that the target welding spot has no insufficient welding problem; and if the ratio of S2/S1 is larger than the preset value, judging that the target welding spot has the insufficient welding problem.
In some embodiments, the predetermined value is set in the range of 0.95 to 1.
The technical scheme provided by the embodiment of the application has at least the following advantages: according to the embodiment of the application, the electroluminescent image and the appearance image of the battery string are combined, the target battery piece which is possibly in a false soldering problem in the battery string can be judged through the electroluminescent image of the battery piece, and meanwhile, the position of the target battery piece on the battery string can be obtained; further, a target appearance image corresponding to the target battery piece is found by combining the appearance images at the corresponding positions; judging whether each welding spot on the target battery piece has a cold joint problem or not through the target appearance image, and positioning the target welding spot on the target battery piece, wherein the cold joint problem possibly exists; and finally, judging whether the target welding spot is in cold joint or not based on the amplified image of the target welding spot. By the method of combining the electroluminescence image and the appearance image, the detection range of the battery string is gradually reduced, the position of the target welding spot is further determined, the welding condition of the target welding spot is judged, and the efficiency and the accuracy of detecting the virtual welding spot in the battery string are improved.
Drawings
One or more embodiments are illustrated by corresponding figures in the drawings, which are not to be construed as limiting the embodiments, unless expressly stated otherwise, the drawings are not to scale; in order to more clearly illustrate the embodiments of the present application or technical solutions in the conventional technologies, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic step diagram of a battery string detection method according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an enlarged image provided in an embodiment of the present application.
Detailed Description
As known from the background art, in the process of detecting the battery string, the virtual welding points on the battery string are difficult to efficiently and accurately obtain.
The battery string can be detected by adopting electroluminescence, a certain forward bias voltage can be applied to the battery string in the electroluminescence detection process, electric energy can enable carriers in the battery string to be compounded to emit infrared light, a region with defects on the battery string can become a strong compounding center of minority carriers, the number of the minority carriers on the defect position is reduced, and the luminous intensity of corresponding infrared light is reduced, so that an infrared camera is adopted to shoot an electroluminescence image of the battery string, and the shot image is subjected to image processing to capture the region with the insufficient soldering defects in the battery string. However, since there are many cells in the cell string and there are many welding spots on the same cell, the electroluminescence detection can only detect the approximate area of the virtual welding spot, and cannot accurately detect the specific virtual welding spot, and since both the front and back of the cells have welding spots, the electroluminescence image cannot determine whether the virtual welding spot is located on the front or back of the cell string based on the mechanism of the electroluminescence detection. In addition, the battery string detection can also be realized in a manual detection mode, the battery string is observed by naked eyes, abnormal points are marked, for example, a welding strip on the welding spot is fluctuated by a tool such as a flexible shifting sheet, and if the welding strip can be fluctuated, the welding spot is a virtual welding spot. However, the manual detection speed is slow, the inspection time is long, and the requirements of high yield and high speed of the current battery string component cannot be met.
The embodiment of the application provides a battery string detection method, so that the efficiency and the accuracy of detection of virtual welding spots in a battery string are improved.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in the examples of the present application, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Fig. 1 is a schematic step diagram of a battery string detection method provided in an embodiment of the present application, and fig. 2 is a schematic diagram of an enlarged image provided in the embodiment of the present application, and the following describes the battery string detection method provided in the embodiment in detail with reference to the accompanying drawings, specifically as follows:
referring to fig. 1, a battery string detection method includes:
and step 11, providing a battery string to be detected, wherein the battery string comprises a plurality of battery pieces, a plurality of welding spots are arranged on the battery pieces, and adjacent battery pieces are electrically connected.
For the cell string to be detected, the cell string comprises a plurality of cell pieces, the cell pieces comprise solar cell pieces, and the solar cell pieces can be connected with welding points on the solar cell pieces in series through welding strips, so that the photo-generated current of each solar cell piece in the cell string is led to the outside of the solar cell piece, and the conversion from light energy to electric energy is realized. In some embodiments, the electrical connection between the solder joint and the solder ribbon is accomplished primarily by high temperature soldering. However, for temperature sensitive batteries such as heterojunction batteries, stacked batteries combined with crystalline silicon batteries, and the like, in order to reduce damage to the batteries themselves by high temperature welding, a low temperature welding strip is generally selected and welding is performed at a low welding temperature. The melting point of the low-temperature welding strip is generally lower than 165 ℃, and the problem of insufficient welding between a welding point and the welding strip is easily caused due to the fact that the welding window is narrow in the process of selecting the low-temperature welding strip for low-temperature welding.
For electroluminescent images, in some embodiments, obtaining an electroluminescent image of a battery string comprises: introducing a forward current which is 1-1.5 times of the open-circuit current into the battery string; and acquiring an electroluminescence image represented by infrared light with the wavelength range of 1000-1100 nm emitted by the battery string. By applying a forward current of 1-1.5 times of open-circuit current to the battery string, current carriers in the battery string are compounded to emit infrared light, and a region with a cold joint problem on the battery string can become a strong compounding center of minority current carriers, so that the number of the minority current carriers in the region with the cold joint problem is reduced, and the luminous intensity of the corresponding infrared light is reduced; and then an infrared camera is adopted to shoot an infrared light electroluminescence image of the battery string in the wavelength range of 1000-1100 nm, and the shot electroluminescence image is subjected to image processing, so that an area with a virtual solder joint defect in the battery string can be captured, but based on the imaging mechanism of the electroluminescence image, the electroluminescence image cannot judge whether the virtual solder joint is positioned on the front side or the back side of the battery string.
In some embodiments, obtaining an electroluminescent image and an appearance image of a string of cells comprises: and establishing a coordinate system, and acquiring the coordinate position of each battery piece in the battery string in the coordinate system, wherein the electroluminescence image and the appearance image both comprise coordinate information representing the coordinate position of each battery piece. By establishing a coordinate system, each battery piece can correspond to a coordinate position in the battery string, so that target coordinate information of the target battery piece can be quickly acquired after the target battery piece possibly having a cold joint problem is acquired in the processing process of the electroluminescent image.
For the appearance image, in some embodiments, the appearance image includes a front image and a back image, and in particular, the method of acquiring the front image and the back image includes: providing a first light source to the front side of the battery string; acquiring a front image along a direction opposite to the front of the battery string; providing a second light source to the back of the battery string; and acquiring a back image along a direction opposite to the back of the battery string.
It is understood that the front surface and the back surface of the battery string are provided with a plurality of welding spots, the welding spots on the front surface or the back surface of each battery piece can be electrically connected with the adjacent battery pieces through the welding strips, and correspondingly, the appearance image of the battery string comprises a front surface image and a back surface image. The welding spot is generally white silver paste, the welding spot is subjected to diffuse reflection under illumination, and the welding spot presented by the camera is white; the welding strip is generally a tin-coated copper strip, the surface of the welding strip is provided with tin-lead alloy, the cross section of the welding strip is generally cylindrical, most light rays are reflected to the surface of the battery string by the surface of the welding strip under illumination, and the color of the welding strip is dark (namely the brightness value of the welding strip is smaller than that of a welding spot) presented by a camera; when the solder strip is soldered to the solder joint, tin build-up occurs near the solder strip, thereby presenting a darker area on the solder joint having a diameter greater than the diameter of the solder strip (i.e., the brightness value at the tin build-up is less than the brightness value of the solder joint). Therefore, the welding spots which are possible to have the insufficient soldering problem on the battery piece can be judged through the brightness values of the welding spots presented by the appearance images of the battery strings; under the irradiation of a light source, the appearance images are obtained along the direction which is over against the front or the back of the battery string, the appearance images of all welding spots in the battery string can be obtained at the same angle, and the judgment error caused by the difference of the brightness of the welding spots and the welding strips due to the difference of the obtained angles is avoided.
Further, in some embodiments, the first light source illuminates in a direction perpendicular to the front side of the battery string and the second light source illuminates in a direction perpendicular to the back side of the battery string. When the irradiation direction of the first light source is vertical to the front face of the battery string, the incident light and the reflected light on the front face of the battery string are vertical to the front face of the battery string, all welding points on the front face of the battery string are in the same illumination condition, and the influence on the accuracy of the front face image due to different illumination conditions can be avoided; when the irradiation direction of the second light source is perpendicular to the back of the battery string, the incident light and the reflected light on the back of the battery string are perpendicular to the back of the battery string, all welding points on the back of the battery string are in the same illumination condition, and the influence on the accuracy of the back image caused by different illumination conditions can be avoided.
In some embodiments, the appearance image includes a front image and a back image; after the appearance image is acquired, the method further comprises the following steps: decomposing the front image into a plurality of first sub-images, wherein each first sub-image corresponds to the front surface of a battery piece and comprises coordinate information of the battery piece; and decomposing the back image into a plurality of second sub-images, wherein each second sub-image corresponds to the back of one cell, and each second sub-image comprises coordinate information of the cell.
It can be understood that after the appearance image is obtained, the front side image is decomposed into a plurality of first sub-images corresponding to the front sides of the battery pieces, each first sub-image comprises coordinate information of the corresponding battery piece, the back side image is decomposed into a plurality of second sub-images corresponding to the back sides of the battery pieces, and each second sub-image comprises coordinate information of the corresponding battery piece; after the electroluminescent image is subjected to image processing to obtain a target cell and obtain a target cell, a first sub-image and a second sub-image corresponding to the target cell are directly extracted based on coordinate information of the target cell, so that the efficiency of obtaining an appearance image of the target is improved.
And step 13, carrying out image processing on the electroluminescence image to obtain a target cell, wherein the target cell is a cell with a target welding spot, and the target welding spot is a welding spot which is judged to be in insufficient welding with a welding strip based on the electroluminescence image.
Based on the above-mentioned imaging mechanism of the electroluminescent image, the area with the insufficient solder defect in the battery string can be obtained after the image processing is performed on the electroluminescent image, and the corresponding target battery piece can be obtained through the position corresponding to the area with the insufficient solder defect.
In some embodiments, image processing the electroluminescent image to obtain the target cell further comprises: and acquiring target coordinate information of the target battery piece, wherein the target coordinate information represents the coordinate position of the target battery piece. By establishing a coordinate system, each battery piece can correspond to a coordinate position in the battery string, so that target coordinate information of the target battery piece can be quickly acquired after the target battery piece possibly having a cold joint problem is acquired in the processing process of the electroluminescent image, and the target external image corresponding to the target battery piece in the external image can be quickly corresponding to the coordinate information.
And 14, acquiring a target appearance image corresponding to the target cell slice from the appearance image.
In some embodiments, obtaining a target appearance image corresponding to the target cell slice from the appearance image includes: and acquiring a target appearance image corresponding to the target coordinate information in the appearance image based on the target coordinate information. It is understood that, after the coordinate system is established, each cell corresponds to the coordinate information, and in the target appearance image, the appearance image can be directly enlarged based on the coordinate information to display the target appearance image corresponding to the target cell.
In some embodiments, obtaining the target appearance image corresponding to the target coordinate information in the appearance image based on the target coordinate information includes: acquiring a first target image corresponding to the target coordinate information in the first sub-image; and acquiring a second target image corresponding to the target coordinate information in the second sub-image, wherein the second target image and the first target image form a target appearance image. It can be understood that after a coordinate system is established and the front image and the back image are decomposed, each cell corresponds to coordinate information and a first sub-image and a second sub-image corresponding to the coordinate information, and based on the coordinate information of the target cell, the first sub-image and the second sub-image corresponding to the target coordinate information in the appearance image can be quickly locked, so that the efficiency of obtaining the target appearance image is further improved.
And step 15, acquiring an enlarged image of the target welding spot based on the target appearance image.
Specifically, in some embodiments, the welding points on the adjacent battery plates are electrically connected through welding strips; based on the target appearance image, acquiring an enlarged image of the target welding spot, comprising: acquiring the brightness value of each welding spot in the target appearance image; acquiring a target welding spot from the target appearance image based on the brightness value of the welding spot, wherein the brightness value of the target welding spot is greater than a preset brightness value; and acquiring an enlarged image of the target welding point from the target appearance image. According to the content, the welding spots with the possible insufficient soldering problem on the battery piece can be judged based on the appearance image of the battery string, the brightness values of the welding spots are larger than the brightness value of the welding strip and the brightness value of the accumulated position of the soldering tin, after the welding spots are welded with the welding strip, the soldering tin is accumulated on the surface of the welding spots nearby the welding strip, and the brightness values of the corresponding welding spots are reduced, so that the target welding spots with the possible insufficient soldering problem can be obtained through comparison of the brightness values of the welding spots and the preset brightness values. The preset brightness value may be 90% to 100% of the brightness value when no solder is deposited on the surface of the solder bump, for example, 90%, 93%, 95%, 98%, or 100%.
And step 16, judging the welding condition of the target welding spot based on the amplified image.
Specifically, referring to fig. 2, in some embodiments, determining the welding condition of the target welding point 102 based on the enlarged image 101 includes: referring to fig. 2 (a), a difference S1 between an actual area of the target weld point 102 and an orthographic area of the solder ribbon 103 on the target weld point 102 is obtained; referring to fig. 2 (b), an exposed area S2 of the actual area of the target solder joint 102 is obtained; if the ratio of S2/S1 is less than or equal to the preset value, judging that the target welding spot 102 has no insufficient welding problem; and if the ratio of S2 to S1 is larger than the preset value, judging that the target welding spot 102 has the insufficient welding problem. It can be understood that whether the solder 104 is accumulated on the surface of the target welding spot 102 can be judged by the brightness value, since the surface of the target welding spot 102 is covered with the welding strip 103, the difference S1 between the actual area of the target welding spot 102 and the orthographic projection area of the welding strip 103 on the target welding spot 102 is the exposed area when the target welding spot 102 is not welded with the welding strip 103, and the exposed area S2 of the actual area of the target welding spot 102 is the area where the solder 104 is not accumulated after the target welding spot 102 is subjected to the welding process; the ratio of S2/S1 can be used to determine the degree of deposited solder 104, which correspondingly reflects the soldering condition of the target solder joint 102.
Further, in some embodiments, the preset value is set in a range of 0.95 to 1, for example, 0.95, 0.96, 0.98, 1. When the preset value is equal to 1, namely the exposed area of the target welding point 102 which is not welded with the welding strip 103 is equal to the area of the target welding point 102 which is not accumulated with the soldering tin 104 after the welding process, namely the target welding point 102 is not welded with the welding strip 103; when the preset value is less than 1, that is, the area of the target welding point 102 on which the soldering tin 104 is not deposited after the welding process is smaller than the exposed area of the target welding point 102 on which the soldering tin 104 is not welded with the solder strip 103, that is, the soldering tin 104 is deposited on the surface of the target welding point 102, but the ratio of S2/S1 needs to be at least less than 0.95 to determine that the welding point 102 and the solder strip 103 are effectively welded because the tin layer of the solder strip 103 flows after welding or the tin layer of the solder strip 103 itself is not uniform.
According to the battery string detection method provided by the embodiment of the application, the electroluminescent image and the appearance image of the battery string are combined, the target battery piece which is possibly in a false soldering problem in the battery string can be judged through the electroluminescent image of the battery piece, and meanwhile, the position of the target battery piece on the battery string can be obtained; further, a target appearance image corresponding to the target battery piece is found by combining the appearance images at the corresponding positions; judging whether each welding spot on the target battery piece has a cold joint problem or not through the target appearance image, and positioning the target welding spot on the target battery piece, wherein the cold joint problem possibly exists; and finally, judging whether the target welding spot is in cold joint or not based on the amplified image of the target welding spot. By the method of combining the electroluminescence image and the appearance image, the detection range of the battery string is gradually reduced, the position of the target welding spot is further determined, the welding condition of the target welding spot is judged, and the efficiency and the accuracy of detecting the virtual welding spot in the battery string are improved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the present application, and that various changes in form and details may be made therein without departing from the spirit and scope of the present application in practice.
Claims (10)
1. A method for detecting a battery string, comprising:
providing a battery string to be detected, wherein the battery string comprises a plurality of battery pieces, a plurality of welding spots are arranged on the battery pieces, and the adjacent battery pieces are electrically connected;
acquiring an electroluminescence image and an appearance image of the battery string;
performing image processing on the electroluminescence image to obtain a target cell, wherein the target cell is the cell with a target welding point, and the target welding point is the welding point which is determined based on the electroluminescence image and is in insufficient welding with the welding strip;
acquiring a target appearance image corresponding to the target battery piece from the appearance image;
acquiring an amplified image of the target welding spot based on the target appearance image;
and judging the welding condition of the target welding spot based on the amplified image.
2. The method for detecting a battery string according to claim 1, wherein the acquiring an electroluminescence image and an appearance image of the battery string comprises:
establishing a coordinate system, and acquiring the coordinate position of each battery piece in the battery string in the coordinate system, wherein the electroluminescent image and the appearance image both comprise coordinate information representing the coordinate position of each battery piece;
the image processing of the electroluminescence image to obtain the target cell further comprises: acquiring target coordinate information of the target battery piece, wherein the target coordinate information represents the coordinate position of the target battery piece;
the acquiring a target appearance image corresponding to the target battery piece from the appearance image comprises:
and acquiring the target appearance image corresponding to the target coordinate information in the appearance image based on the target coordinate information.
3. The battery string detection method according to claim 2, wherein the appearance image includes a front surface image and a back surface image; after the appearance image is acquired, the method further comprises the following steps:
decomposing the front image into a plurality of first sub-images, wherein each first sub-image corresponds to the front surface of one battery piece, and each first sub-image comprises coordinate information of the battery piece;
and decomposing the back image into a plurality of second sub-images, wherein each second sub-image corresponds to the back of one battery piece, and each second sub-image comprises coordinate information of the battery piece.
4. The method for detecting a battery string according to claim 3, wherein the acquiring the target appearance image corresponding to the target coordinate information in the appearance image based on the target coordinate information includes:
acquiring a first target image corresponding to the target coordinate information in the first sub-image;
and acquiring a second target image corresponding to the target coordinate information in the second sub-image, wherein the second target image and the first target image form the target appearance image.
5. The method for detecting a battery string according to claim 3, wherein the method for acquiring the front image and the back image comprises:
providing a first light source to the front side of the battery string;
acquiring the front image along the direction opposite to the front of the battery string;
providing a second light source to the back of the battery string;
and acquiring the back image along the direction opposite to the back of the battery string.
6. The method according to claim 5, wherein the first light source irradiates in a direction perpendicular to the front surface of the battery string, and the second light source irradiates in a direction perpendicular to the rear surface of the battery string.
7. The method of inspecting a battery string according to claim 1, wherein acquiring an electroluminescence image of the battery string comprises:
introducing a forward current which is 1-1.5 times of the open-circuit current into the battery string;
and acquiring the electroluminescent image presented by infrared light with the wavelength range of 1000-1100 nm emitted by the battery string.
8. The method for detecting a battery string according to claim 1, wherein acquiring a magnified image of the target welding point based on the target appearance image comprises:
acquiring the brightness value of each welding spot in the target appearance image;
acquiring the target welding point from the target appearance image based on the brightness value of the welding point, wherein the brightness value of the target welding point is greater than a preset brightness value;
and acquiring the amplified image of the target welding point from the target appearance image.
9. The method for inspecting a battery string according to claim 1, wherein the solder points on the adjacent battery pieces are electrically connected by solder ribbons; based on the enlarged image, judging the welding condition of the target welding spot, including:
acquiring the difference S1 between the actual area of the target welding spot and the orthographic projection area of the welding strip on the target welding spot;
obtaining the exposed area S2 of the actual area of the target welding spot;
if the ratio of S2/S1 is less than or equal to a preset value, judging that the target welding spot has no insufficient welding problem;
and if the ratio of S2/S1 is larger than a preset value, judging that the target welding spot has a cold joint problem.
10. The method for detecting a battery string according to claim 9, wherein the preset value is set to a range of 0.95 to 1.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517326A (en) * | 2024-01-04 | 2024-02-06 | 中成空间（深圳）智能技术有限公司 | Batch battery piece detection method, device and system of flexible photovoltaic module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517326A (en) * | 2024-01-04 | 2024-02-06 | 中成空间（深圳）智能技术有限公司 | Batch battery piece detection method, device and system of flexible photovoltaic module |
| CN117517326B (en) * | 2024-01-04 | 2024-05-07 | 中成空间（深圳）智能技术有限公司 | Batch battery piece detection method, device and system of flexible photovoltaic module |
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