TWI648947B - Apparatus and method for inspecting solar cell - Google Patents

Abstract

The invention discloses a detecting device and a method for a solar cell sheet. The method for detecting defects of a solar cell sheet includes providing a solar cell sheet having a light collecting surface and a plurality of main electrode lines disposed on the light collecting surface. Dividing the light collecting surface of the solar cell into a plurality of regions to be tested, wherein each of the main electrode lines passes through at least one of the regions to be tested. At the same time, a plurality of detection areas of the light-receiving surface are irradiated with a detection light. Then, the plurality of sets of actual photocurrent values of the solar cell sheets are measured, and the plurality of sets of the actual photocurrent values respectively correspond to the plurality of the regions to be tested. According to each set of actual photocurrent values of the solar cell, it is determined whether the corresponding test area is defective. In addition, a detection device for a solar cell sheet can be used to perform the above detection method.

Description

Solar cell chip detecting device and method

The present invention relates to a solar cell detection apparatus and method, and more particularly to an apparatus and method for detecting internal defects of a solar cell sheet.

At the production end of the solar cell sheet, it is usually only possible to measure the cell conversion efficiency of the solar cell sheet to initially screen out the defective product. However, the merits of battery conversion efficiency cannot actually reflect whether the solar cell has internal defects such as micro cracks or finger interruptions. These internal defects have no significant effect on the cell conversion efficiency of the solar cell sheet, but have a great influence on the stability, reliability and lifetime of the solar cell sheet.

In the prior art, after a plurality of solar cells are serially welded to form a solar module, an electroluminescence detection system is used to perform internal defect detection on a plurality of solar cells at a time. Specifically, a current is applied to the solar cell module to excite electrons inside the solar cell sheet to a high energy level, and the excited electrons recombine with the holes to emit light. At the same time, an electroluminescence image can be obtained by using a near-infrared camera to capture the weak near-infrared light emitted from the substrate. By analyzing the electroluminescence image, it can be known whether the solar cell in the solar cell module is defective.

However, electroluminescence detection systems are not currently widely used in solar cell production to detect solar cells. The main reason is that the solar cell is not soldered at the production end, so only one solar cell can be detected at a time, which is too time consuming. In addition, additional restrictions on electroluminescence detection systems and image processing techniques are provided. It will also greatly increase the cost of equipment.

In addition, at the production end, when the solar cell sheet is detected for classification determination, it is required to complete at least 3,000 solar cell sheets per hour. In other words, the detection of each solar cell piece needs to be completed in 1 to 2 seconds. Therefore, although the existing laser beam induced current image detection technology can also be used to detect whether the solar cell has internal defects, it takes at least several minutes to measure a solar cell each time, which cannot be met. The detection speed required at the production end.

The technical problem to be solved by the present invention is to provide a solar cell sheet detecting apparatus and method for dividing the solar cell sheet into a plurality of regions to be tested and measuring solar cell sheets in different regions to be tested. The photocurrent value can detect whether the solar cell has defects and the location of the defect in a short time.

In order to solve the above technical problem, one of the technical solutions adopted by the present invention is to provide a detecting device for a solar cell sheet. The solar cell panel comprises a light-receiving surface and a plurality of main electrode lines disposed on the light-receiving surface, the light-receiving surface is divided into a plurality of regions to be tested, and each of the main electrode lines passes through at least one of the regions to be tested. The solar cell detection device includes a light simulation unit, a plurality of probe modules, a plurality of auxiliary measurement modules, and a processing unit. The light simulation unit is configured to provide a detection light that is incident on the light collecting surface. The plurality of probe modules respectively correspond to the plurality of main electrode lines, and each of the probe modules includes a probe unit corresponding to at least one of the regions to be tested. The plurality of auxiliary measurement modules are electrically connected to the plurality of probe modules. A plurality of auxiliary measuring modules are connected in parallel, and a plurality of auxiliary measuring modules are respectively matched with a plurality of probe modules to respectively measure multiple sets of actual photocurrent values of the solar cell sheets, and multiple sets of actual photocurrent values Corresponding to multiple areas to be tested. The processing module is electrically connected to the plurality of auxiliary measuring modules. The processing module determines whether the corresponding area to be tested is defective according to each set of actual photocurrent values of the solar cell.

In order to solve the above technical problem, another technical solution adopted by the present invention A method for detecting a defect of a solar cell, comprising: providing a solar cell sheet, the solar cell sheet having a light collecting surface and a plurality of main electrode lines disposed on the light collecting surface; and collecting the solar cell sheet The surface is divided into a plurality of regions to be tested, wherein each of the main electrode lines passes through at least one of the regions to be tested; and at the same time, a plurality of detection regions of the light-receiving surface are irradiated with a detection light; and the plurality of actual light beams of the solar cell sheet are measured. a current value, wherein the plurality of sets of actual photocurrent values respectively correspond to the plurality of regions to be tested; and determining, according to each set of actual photocurrent values of the solar cell, whether the corresponding region to be tested is defective.

The invention has the beneficial effects of the solar cell sheet detecting device and method provided by the technical solution of the present invention, which can simultaneously measure multiple sets of actual light of the solar cell sheet by using a plurality of auxiliary measuring modules connected in parallel. The current value", because multiple sets of actual photocurrent values will correspond to multiple areas to be tested, and the actual photocurrent value of each group can reflect the carrier composite condition of the corresponding test area, so that the corresponding photocurrent value can be determined according to the actual photocurrent value. Whether the area to be tested is defective.

For the production end, the detection device and method for the solar cell sheet provided by the embodiments of the present invention can be integrated with the original Lumination-Current-Voltage detection system, so that no electroluminescence detection is required. The system and image interpretation device can greatly reduce the cost of equipment construction. In addition, the defect detecting method of the solar cell sheet provided by the present invention simultaneously detects the different areas to be tested, thereby shortening the detecting time.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

1‧‧‧Solar cell test equipment

10‧‧‧Light simulation unit

L‧‧‧Detecting light

11a, 11b‧‧‧ probe module

111a~114a, 111b~114b‧‧‧ probe unit

G1~G4‧‧‧Subgroup

12a, 12b‧‧‧Auxiliary measurement module

121a~124a, 121b~124b‧‧‧Auxiliary measurement unit

13‧‧‧Main measurement module

14‧‧‧Processing module

140‧‧‧Database

15‧‧‧Loading station

150‧‧‧Electrode contact

2‧‧‧Solar cell

2a‧‧‧ Receiving surface

20‧‧‧ front electrode structure

20a, 20b‧‧‧ main electrode line

R11~R24‧‧‧Down area

2b‧‧‧back

21‧‧‧Back electrode

S100~S104, S200‧‧‧ process steps

1 is a side elevational view of a detecting device for a solar cell sheet according to an embodiment of the present invention.

2 is a top plan view showing a solar cell sheet detecting apparatus using a solar cell sheet according to an embodiment of the present invention.

3 is a top plan view showing a solar cell sheet detecting apparatus using a solar cell sheet according to another embodiment of the present invention.

4 is a top plan view showing a solar cell sheet detecting apparatus using a solar cell sheet according to another embodiment of the present invention.

FIG. 5 is a flow chart of a method for detecting a solar cell sheet according to an embodiment of the present invention.

The following is a description of an embodiment of the present invention relating to a "detecting device and method for a solar cell sheet" by a specific embodiment, and those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in the specification. The present invention may be carried out or applied in various other specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention. In addition, the drawings of the present invention are merely illustrative and are not intended to be stated in the actual size. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the scope of the present invention.

Please refer to Figure 1 to Figure 2. 1 is a side elevational view of a solar cell sheet detecting apparatus according to an embodiment of the present invention, and FIG. 2 is a top plan view showing a solar cell sheet detecting apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the detecting device 1 for a solar cell sheet according to an embodiment of the present invention can be used to detect whether a solar cell sheet has defects that cannot be observed by the naked eye, such as microcracking or disconnection. In addition, the detecting device 1 of the solar cell sheet of the embodiment of the present invention can also detect the region where the defect is located, and further classify the solar cell sheet according to the respective test results of the solar cell sheet 2.

The detecting device 1 of the solar cell sheet of the embodiment of the invention comprises a light simulating unit 10, a plurality of probe modules 11a and 11b, a plurality of auxiliary measuring modules 12a and 12b, a main measuring module 13 and a processing module. 14.

The solar cell sheet 2 may be a germanium-based solar cell sheet such as a single crystal germanium solar cell sheet, an amorphous germanium solar cell sheet or a polycrystalline germanium solar cell sheet. In this embodiment, after the solar cell 2 completes most of the process, the solar cell 2 can be continuously detected by the detecting device 1 of the embodiment of the present invention to obtain electrical performance and photoelectric conversion of the solar cell 2. The efficiency and the state of the defect distribution allow the solar cell sheet 2 to be classified or screened.

The solar cell sheet 2 to be detected generally has a light-receiving surface 2a and a back surface 2b opposite to the light-receiving surface 2a. The solar cell sheet 2 includes a front electrode structure 20 provided on the light receiving surface 2a and a back surface electrode 21 provided on the back surface 2b.

Referring first to FIG. 2, the front electrode structure 20 includes a plurality of main electrode lines 20a, 20b, that is, a bus bar, and finger electrodes (not shown) interleaved with the plurality of main electrode lines 20a, 20b. In addition, the light-receiving surface 2a of the solar cell 2 is divided into a plurality of regions R11 to R24, and each of the main electrode lines 20a and 20b passes through at least one of the regions R11 to R24, and each of the main electrodes 20a, 20b will be provided with at least one point to be tested (not labeled) located in the area to be tested R11~R24.

In the embodiment of Fig. 2, the solar cell sheet 2 having the two main electrode lines 20a, 20b will be described as an example. The two main electrode lines 20a, 20b are juxtaposed to each other in the first direction D1, and both of the main electrode lines 20a, 20b extend toward the second direction D2.

As shown in FIG. 2, the light-receiving surface 2a of the solar cell sheet 2 of the present embodiment is divided into m×n regions R11 to R24, where m is each column (ie, arranged along the first direction D1) to be tested. The number of zones, n is the number of zones to be tested per row (ie, arranged along the second direction D2).

The number of R11~R24 in the test area will affect the accuracy of the test results. Therefore, when the accuracy of the detection result is desired, the light-receiving surface 2a can be divided into a larger number of regions R11 to R24 with smaller regions. In the present embodiment, the light-receiving surface 2a is divided into 2 × 4 areas to be tested R11 to R24.

The area to be tested in the same column (arranged along the first direction D1), such as: the area to be tested R11, The number m of R21 is determined according to the number of main electrode lines 20a, 20b. In the present embodiment, each of the main electrode lines 20a (or the main electrode lines 20b) passes through the areas to be tested R11 to R14 (or the areas to be tested R21 to R24) located in the same row. In addition, the areas to be tested R11 to R24 through which the plurality of main electrode lines 20a and 20b pass do not overlap. In other words, only one main electrode line 20a, 20b passes through each of the regions R11 to R24 to be tested, and there is no two main electrode lines 20a, 20b in the same region to be tested R11 to R24. However, in other embodiments, the range of the regions R11 to R24 to be tested may be changed according to actual needs, so that each of the regions R11 to R24 covers two or more main electrode lines 20a and 20b, and the present invention Not limited.

Please refer to Figure 1 again. The light simulation unit 10 is configured to provide a detection light L that is incident on the light-receiving surface 2a. The light intensity and wavelength spectrum of the detection light L generated by the light simulation unit 10 can be adjusted according to actual needs. During the detection process, the detection light L illuminates the entire light-receiving surface 2a of the solar cell sheet 2 to cause the solar cell sheet 2 to generate a photocurrent.

In the above, the plurality of probe modules 11a and 11b are provided corresponding to the plurality of main electrode lines 20a and 20b, respectively. Therefore, the number of probe modules is M and will be the same as the number of main electrode lines 20a, 20b. In addition, each of the probe modules 11a (or 11b) includes a probe unit 111a-114a (or 111b-114b) corresponding to at least one of the regions R11 to R14 (or R21 to R24).

Please refer to Figure 2. In this embodiment, each of the probe modules 11a (or 11b) includes a plurality of probe units 111a-114a (or 111b-114b) corresponding to the same main electrode line 20a (or 20b) to respectively contact the same A plurality of points to be measured on one main electrode line 20a (or 20b). If the number of probe units 111a-114a (or 111b-114b) on each probe module 11a (or 11b) is N, then N and each row of the test area R11~R14 (or R21~R24) The number n is the same.

The total number of the probe units 111a to 114a, 111b to 114b is the same as the number of the regions R11 to R24 to be tested. In one embodiment, the number of the regions R11 to R24 to be tested is R, the number M of probe modules, and the plurality of probe units 111a to 114a (or 111b~) on each probe module 11a (or 11b). The number N of 114b) satisfies the following relationship: R = M × N.

Please refer to Figure 1 again. It is to be noted that the detecting device 1 for a solar cell sheet according to an embodiment of the present invention includes a carrying platform 15 for carrying the solar cell sheet 2. An electrode contact portion 150 for electrically contacting the back surface electrode 21 is disposed on the carrier 15.

When the solar cell 2 is disposed on the carrier 15 , the back electrode 21 can be electrically connected to the main measurement module 13 by contacting the electrode contact portion 150 . Accordingly, when the probe units 111a to 114a, 111b to 114b on the probe modules 11a and 11b are in contact with the main electrode lines 20a and 20b, a detection circuit can be formed.

Referring to FIG. 1 again, the plurality of auxiliary measurement modules 12a and 12b are electrically connected to the plurality of probe modules 11a and 11b, respectively. The plurality of auxiliary measurement modules 12a and 12b in the embodiment are connected in parallel, and the plurality of auxiliary measurement modules 12a and 12b are respectively matched with the plurality of probe modules 11a and 11b to respectively measure the solar cell sheets. The plurality of sets of actual photocurrent values of 2, and the plurality of sets of actual photocurrent values respectively correspond to the plurality of regions R11 to R24 to be tested.

Referring to FIG. 2, each of the auxiliary measurement modules 12a (or 12b) of the embodiment includes a plurality of auxiliary measurement units 121a-124a (or 121b-124b), and a plurality of auxiliary measurement units 121a-124a, 121b to 124b are connected in series to the plurality of probe units 111a to 114a and 111b to 114b, respectively. When the detection light L is incident on the light-receiving surface 2a of the solar cell sheet 2, each of the auxiliary measuring units 121a to 124a, 121b to 124b can detect an actual photocurrent value.

It should be noted that since the detection light L is irradiated to the entire light receiving surface 2a, the actual photocurrent value measured by each of the auxiliary measuring units 121a to 124a, 121b to 124b is not only a part of the solar cell sheet 2 The photocurrent generated by the region is the photocurrent generated by the entire solar cell 2.

However, if there is a defect in the area to be tested R11 to R24 of the solar cell 2, a recombination center of a carrier (hole or electron) is generated in a defective place, so that the measured actual photocurrent is generated. The value is lower. Therefore, the actual photocurrent values measured by the respective auxiliary measuring units 121a-124a, 121b-124b reflect the defects of the corresponding areas R11 to R24. By analyzing these actual photocurrent values, it can be determined whether the solar cell sheet 2 has defects, and The area in which the defect is distributed.

Referring to FIG. 1 again, the processing module 14 is electrically connected to the optical simulation unit 10 and the plurality of auxiliary measurement modules 12a and 12b. The processing module 14 controls the light simulation unit 10 to emit the detection light L on the solar cell 2, and controls the plurality of auxiliary measurement modules 12a, 12b to measure the plurality of actual photocurrent values of the solar cell 2.

In addition, the processing module 14 receives and analyzes the plurality of sets of actual photocurrent values measured by the plurality of auxiliary measurement modules 12a, 12b. Specifically, the processing module 14 determines whether the corresponding test areas R11 R R24 are defective according to each set of actual photocurrent values of the solar cell sheet 2 .

In this embodiment, the processing module 14 further includes a database 140. The database 140 stores a plurality of reference photocurrent values respectively corresponding to the plurality of regions R11 to R24 to be tested. The processing module 14 can determine whether there is a defect in the corresponding test area R11 R R24 by comparing the reference photocurrent value corresponding to the same test area R11 R R24 and the actual photo current value.

For example, in the embodiment, the light-receiving surface 2a of the solar cell 2 is divided into eight regions R11 to R24, so that the processing module 14 is received by the auxiliary measurement modules 12a and 12b. The actual photocurrent values measured at different locations of the solar cell 2 are grouped. Assuming that the solar cell 2 has a defect in the region to be tested R11, the processing module 14 can compare, and the actual photocurrent value measured in the region to be tested R11 is lower than the reference photocurrent value corresponding to the region R11 to be tested. Therefore, it is judged that the defect is located in the area to be tested R11.

In addition, the processing module 14 can classify and screen the solar cell sheets 2 according to the number of regions in which the defects are distributed. In detail, the grading standard and screening conditions of the solar cell sheet 2 can be stored in the database 140. After the processing module 14 determines the defective areas R11 to R24, the number of the to-be-tested areas R11 to R24 having defects is further known, and the total area of the defective areas R11 to R24 is obtained. The ratio of the total area of the smooth surface 2a.

The foregoing grading standard is determined, for example, by setting the ratio of the total area of the areas to be tested R11 to R24 having defects to the total area of the light-receiving surface 2a to fall within the first predetermined range, and then determining that Preferably; if the ratio of the total area of the defective areas R11 to R24 to the total area of the light-receiving surface 2a falls within the second predetermined range, it is suboptimal, and so on. The foregoing screening condition is, for example, that the ratio of the total area of the areas to be tested R11 to R24 having defects to the total area of the light-receiving surface 2a is less than a predetermined value, and if it exceeds the preset value, it is determined to be a defective product.

In another embodiment, the processing module 14 can generate a photocurrent image according to the positions of the plurality of regions R11 to R24 and the actual photocurrent values of the regions R11 to R24, respectively, to facilitate operation. The person interprets the defect distribution of the solar cell sheet 2.

In addition, the detecting device 1 of the solar cell sheet of the embodiment of the present invention can also measure other electrical performances of the solar cell sheet 2. Please refer to Figure 1. Specifically, the detecting device 1 of the solar cell sheet of the embodiment of the present invention further includes a main measuring module 13 electrically connected to the processing module 14. In addition, the main measurement module 13 and the plurality of auxiliary measurement modules 12a and 12b connected in parallel with each other are connected in series.

The main measurement module 13 is controlled by the processing module 14 to detect electrical performance of the solar cell 2, such as open circuit voltage, short circuit current, and photoelectric conversion efficiency. In this embodiment, the main measurement module 13 can be used to measure the total photocurrent value of the solar cell 2, that is, the plurality of actual photocurrent values respectively measured by the plurality of auxiliary measurement modules 12a, 12b. sum.

More specifically, assuming that a plurality of auxiliary measuring units 121a ~ 124a at the actual measuring region photocurrent R11 ~ R14 respectively to the measured value of _{I 11, I 12, I 13} , I 14, and a plurality of auxiliary measuring The actual photocurrent values measured by the cells 121b to 124b in the areas to be tested R21 to R24 are I ₂₁ , I ₂₂ , I ₂₃ , and I _{24 , respectively} . The relationship between the total photocurrent value (I) measured by the main measurement module 13 and each actual photocurrent value I ₁₁ ~I ₂₄ is: I = n ₁₁ × I ₁₁ + n ₁₂ × I ₁₂ + n ₁₃ ×I ₁₃ +...+n ₂₄ ×I ₂₄ . The aforementioned n ₁₁ ~ n ₂₄ are coefficient values corresponding to the plurality of test areas R11 to R24, respectively, and can be obtained by appropriate electrical simulation or by correction measurement.

Accordingly, when the solar cell sheet provided by the embodiment of the present invention is used, the detection device is provided. When the solar cell sheet 2 is subjected to defect detection, the solar cell sheet 2 is first placed on the stage 15 and the detection light L is generated by the light simulation unit 10 to be irradiated onto the entire light-receiving surface 2a of the solar cell sheet 2. Subsequently, the plurality of probe modules 11a, 11b can be controlled to descend to contact the plurality of probe units 111a-114a, 111b-114b in contact with the solar cell sheet 2 at the same time to measure the actual number of the plurality of solar cells 2 Photocurrent value. The processing module 14 further determines whether the corresponding test areas R11 R R24 are defective according to the actual photocurrent values of each group of the received solar cells 2 . Detailed detection steps will be described later.

Accordingly, the detecting device 1 for the solar cell panel provided by the embodiment of the present invention can measure the corresponding actual photocurrent value for each of the to-be-tested regions R11 to R24 of the solar cell panel 2 in a short time, and according to The actual photocurrent value is used to detect whether the solar cell sheet 2 has defects and defect distribution conditions. In addition, the detecting device 1 for the solar cell sheet provided by the embodiment of the present invention can also screen and classify the solar cell sheet 2 according to the defect distribution condition.

Please refer to Figure 3. 3 is a top plan view showing a solar cell sheet detecting apparatus using a solar cell sheet according to another embodiment of the present invention.

The difference from the embodiment of FIG. 2 is that the number of the regions R11 to R21 of the solar cell sheet 2 in the embodiment of FIG. 3 is the same as the number of the main electrode lines 20a, 20b. Compared with the previous embodiment, the number of the regions R11 to R21 to be tested is reduced, but the area is large.

In addition, in the present embodiment, the plurality of probe units 111a to 114a (or 111b to 114b) corresponding to the same main electrode line 20a (or 20b) in each probe module 11a (or 11b) are connected in series. . Each of the auxiliary measurement modules 12a (or 12b) includes at least one auxiliary measurement unit 121a, 121b (one is shown in FIG. 3), and one of the plurality of probe units 111a to 114a (or 111b to 114b) The auxiliary measuring unit 121a (or 121b) is connected in series.

Similar to the previous embodiment, the processing module 14 receives and analyzes the plurality of sets of actual photocurrent values measured by the plurality of auxiliary measurement modules 12a, 12b, and according to each group of actual photocurrent values of the solar cell 2 To determine whether the corresponding test area R11~R21 is defective.

Please refer to FIG. 4. FIG. 4 is a top plan view showing the detection of the solar cell by the detecting device of the solar cell sheet according to another embodiment of the present invention. In the embodiment of FIG. 4, the light-receiving surface 2a is divided into four areas to be tested R11 to R22. The plurality of probe units 111a to 114a (or 111b to 114b) in the same probe module 11a (or 11b) are divided into a plurality of subgroups G1, G2 (or G3, G4). Taking one of the subgroups G1 as an example, the probe units 111a to 112a in each subgroup G1 are connected in series to each other.

In addition, taking the probe module 11a as an example, each of the subgroups G1 and G2 in the same probe module 11a is connected in parallel with each other. In this case, each of the auxiliary measurement modules 12a (or 12b) includes the auxiliary measurement units 121a to 122a (or 121b to 122b) having the same number as the subgroups G1, G2 (or G3, G4). The auxiliary measuring unit 121a will connect the secondary group G1 in series, and the auxiliary measuring unit 122a will connect the secondary group G2 in series, but the auxiliary measuring unit 121a and the auxiliary measuring unit 122a will be connected in parallel. Accordingly, the auxiliary measurement modules 12a, 12b can measure the plurality of sets of actual photocurrent values of the solar cell sheet 2.

In view of the above, the smaller the number of areas to be tested, the larger the area. Therefore, the processing module 14 processes the data faster. However, the smaller the number of regions to be tested, the lower the accuracy of the processing module 14 in determining whether a defect exists. Therefore, those skilled in the art can design the circuit according to the requirements of the actual application, so that the plurality of probe units 111a-114a, 111b-114b in the same probe module 11a, 11b have different connection modes in different modes. For example: switch to all parallel, partial parallel or all series. According to this, the user can switch different measurement modes according to the requirements.

Please refer to Figure 5. FIG. 5 is a flow chart of a method for detecting a solar cell sheet according to an embodiment of the present invention. The method of detecting the solar cell sheet of the present embodiment can be performed by the detecting device 1 of the solar cell sheet of FIGS. 1 to 4.

In step S100, a solar cell sheet is provided. The solar cell sheet has a light collecting surface and a plurality of main electrode lines disposed on the light collecting surface. In step S101, the light collecting surface of the solar cell sheet is divided into a plurality of regions to be tested, wherein each of the main electrode lines passes through at least one of the regions to be tested.

The manner in which the light-receiving surface 2a of the solar cell sheet 2 is divided can be referred to the embodiment of FIGS. 2 to 4 described above. As mentioned above, the number of R11~R24 to be tested can be determined according to actual needs.

In step S102, a plurality of detection areas of the light-receiving surface are simultaneously irradiated with a detection light. In the present embodiment, the detection light L can be generated by the light simulation unit 10 shown in FIG. 1, and the detection light L is irradiated onto the entire light-receiving surface of the solar cell sheet 2 when the detection is performed.

In step S103, a plurality of sets of actual photocurrent values of the solar cell sheet are measured, wherein the plurality of sets of actual photocurrent values respectively correspond to the plurality of regions to be tested. As described above, the plurality of sets of actual photocurrent values of the solar cell sheet 2 can be measured by the auxiliary measuring units 121a to 124a, 121b to 124b of the auxiliary measuring modules 12a and 12b of FIGS. 1 to 4.

Next, in step S104, according to each set of actual photocurrent values of the solar cell sheets, it is determined whether the corresponding area to be tested is defective.

It should be noted that, before step S104 is performed, step S200 may be performed to establish a database, and the database stores a plurality of reference photocurrent values respectively corresponding to the plurality of the regions to be tested.

In one embodiment, the database may be created by providing a standard solar cell, and the standard solar cell is divided into a plurality of standard test areas. The plurality of standard test areas respectively correspond to the plurality of test areas of the solar cell to be tested. Then, the illumination detection light is applied to a plurality of standard test areas of the standard solar cell, and the plurality of sets of reference photocurrent values of the standard solar cell are measured, wherein the plurality of sets of reference photocurrent values respectively correspond to the plurality of standards to be tested Area.

When the standard solar cell is measured to establish a database, it can also be performed by using a solar cell detecting device as shown in FIGS. 1 to 4. In addition, the grading standards and screening conditions of solar cells can be stored in the database for subsequent grading and screening.

Then, according to the actual photocurrent value of each group of the solar cell sheets, The step of determining whether the corresponding area to be tested is defective may include: respectively comparing the reference photocurrent value corresponding to the same area to be tested and the actual photocurrent value; and the error value between the actual photocurrent value and the reference photocurrent value When the predetermined range is exceeded, it is determined that the area to be tested corresponding to the actual photocurrent value has a defect.

[Advantageous Effects of Embodiments]

The invention has the beneficial effects that the detection device and method for the solar cell sheet provided by the embodiments of the present invention can be integrated with the original Luminance-Current-Voltage detection system, so that no electroluminescence is required. The detection system and the image interpretation device can greatly reduce the cost of equipment construction.

The detecting device of the solar cell sheet provided by the embodiment of the invention can analyze whether the solar cell sheet has defects, the location of the defect and the defect distribution, and is beneficial to further classifying and screening the solar cell sheet. In addition, understanding the location of defects and the distribution of defects can also help to trace the causes of defects in the production of solar cells, which can further optimize process parameters and conditions.

In addition, in the method for detecting a solar cell panel provided by the present invention, the detection light is irradiated to all the regions to be tested at the same time to simultaneously detect the different regions to be tested, thereby shortening the detection time. Specifically, the detection time of each solar cell sheet is expected to be achieved within 1 to 2 seconds, and can meet the detection speed required by the production end.

The detecting device of the solar cell sheet provided by the embodiment of the present invention can detect the electrical performance of the solar cell sheet, such as an open circuit voltage, a short circuit current, and a photoelectric conversion efficiency, in addition to detecting the position of the defect.

The above disclosure is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the present specification and the contents of the drawings are included in the application of the present invention. Within the scope of the patent.

Claims (14)

A solar cell sheet detecting device, the solar cell sheet includes a light collecting surface and a plurality of main electrode lines disposed on the light collecting surface, and the light collecting surface is divided into a plurality of areas to be tested, each of which The detecting device of the solar cell sheet includes: a light simulating unit for providing a detecting light that is irradiated on the light receiving surface; and a plurality of probe modules Corresponding to a plurality of the main electrode lines, each of the probe modules includes a probe unit corresponding to at least one of the to-be-measured regions; and a plurality of auxiliary measurement modules electrically connected to each other The probe module, wherein the plurality of auxiliary measurement modules are connected in parallel, and the plurality of auxiliary measurement modules respectively cooperate with the plurality of probe modules to respectively measure the solar energy a plurality of sets of actual photocurrent values of the battery, and a plurality of the actual photocurrent values respectively corresponding to the plurality of the test areas; and a processing module electrically connected to the plurality of the auxiliary measurement modules, wherein The processing module is based on each group of the solar cell sheets The actual current value of said light, to determine if the corresponding test zone is defective. The apparatus for detecting a solar cell of claim 1, wherein each of the main electrode lines passes through a plurality of the regions to be tested, and each of the main electrode lines has a plurality of the regions to be tested. a plurality of to-be-measured points, each of the probe modules includes a plurality of probe units corresponding to the same main electrode line to respectively contact a plurality of the to-be-measured points on the same main electrode line . The detecting device of the solar cell of claim 2, wherein each of the auxiliary measuring modules comprises a plurality of auxiliary measuring units connected in parallel, and the plurality of auxiliary measuring units are respectively connected in series Probe unit. A detecting device for a solar cell sheet according to claim 2, wherein the probe The number of modules, the number of the plurality of probe units on each of the probe modules, and the number of the regions to be tested satisfy the following relationship: R=M×N, where the M is The number of probe modules, the N is the number of the plurality of probe units on each of the probe modules, and the R is the number of the regions to be tested. The detecting device of the solar cell sheet according to claim 2, wherein a plurality of the probe units corresponding to the same main electrode line in each of the probe modules are connected in series, each of the auxiliary The measurement module includes at least one auxiliary measurement unit, and one of the plurality of probe units is connected in series to at least one of the auxiliary measurement units. The detecting device of the solar cell sheet according to claim 5, wherein the number of the regions to be tested is the same as the number of the probe modules. The apparatus for detecting a solar cell of claim 1, further comprising: a main measurement module electrically connected to the processing module to measure a total photocurrent value of the solar cell and transmit the same The total photocurrent value is applied to the processing module, wherein a plurality of the auxiliary measurement modules connected in parallel with each other are connected in series with the main measurement module. The detecting device of the solar cell sheet according to claim 7, wherein the solar cell sheet comprises a back electrode, and the detecting device comprises a carrying platform for carrying the solar cell sheet, and the carrying platform is provided An electrode contact portion for electrically contacting the back surface electrode is electrically connected to the main measurement module through the electrode contact portion. The detecting device of the solar cell sheet according to claim 1, wherein the processing module generates a photocurrent image according to the positions of the plurality of the regions to be tested. The detecting device of the solar cell of claim 1, wherein the processing module includes a database, and the database stores a plurality of reference photocurrent values respectively corresponding to the plurality of the regions to be tested. The processing module compares the reference photocurrent value corresponding to the same one of the to-be-measured regions and the actual photocurrent value to determine whether the corresponding region to be tested is defective. A method for detecting a solar cell, comprising: providing a solar cell sheet, the solar cell sheet having a light-receiving surface and a plurality of main electrode lines disposed on the light-receiving surface; The light-receiving surface is divided into a plurality of regions to be tested, wherein each of the main electrode lines passes through at least one of the regions to be tested; and a plurality of the regions to be tested on the light-receiving surface are irradiated with a detection light. Measure a plurality of sets of actual photocurrent values of the solar cell sheet, wherein the plurality of sets of the actual photocurrent values respectively correspond to the plurality of the regions to be tested; and according to each group of the solar cell sheets The actual photocurrent value is used to determine whether the corresponding area to be tested is defective. The method for detecting a solar cell of claim 11, further comprising: establishing a database, wherein the database stores a plurality of reference photocurrent values respectively corresponding to the plurality of the regions to be tested. The method for detecting a solar cell of claim 12, wherein the step of establishing the database comprises: providing a standard solar cell, wherein the standard solar cell is divided into a plurality of standard test areas, wherein A plurality of the standard test areas respectively correspond to a plurality of the test areas; and the plurality of the standard cells to be irradiated with the detection light on the standard solar cell sheet And measuring a plurality of reference photocurrent values of the standard solar cell, wherein the plurality of sets of the reference photocurrent values respectively correspond to the plurality of sets of the standard test zones. The method for detecting a solar cell according to claim 12, wherein the step of determining whether the corresponding area to be tested is defective according to the actual photocurrent value of each group of the solar cell sheets comprises: Comparing the reference photocurrent value corresponding to the same one of the to-be-measured regions and the actual photocurrent value respectively; and when the error value of the actual photocurrent value and the reference photocurrent value exceeds a predetermined range And determining that the area to be tested corresponding to the actual photocurrent value has a defect.