Detection method and detection system for corrosion performance of solar cell

Abstract

The invention discloses a method and system for detecting the corrosion performance of a solar cell, and belongs to the technical field of cells. The method comprises the following steps: placing a solar cell in a soldering flux, taking the solar cell as a working electrode, and taking the soldering flux as an electrolyte; performing polarization curve scanning on the working electrode to obtain self-corrosion electrical parameters of the solar cell in the soldering flux; and determining the corrosion performance of the solar cell in the scaling powder environment based on the self-corrosion electrical parameters. According to the method, the solar cell is used as a working electrode, the scaling powder is used as electrolyte, the working electrode is subjected to polarization curve scanning, self-corrosion electrical parameters of the solar cell in the scaling powder are obtained, and the corrosion performance of the solar cell in the scaling powder environment is analyzed. The corrosion effect of the scaling powder on the solar cell can be accurately detected, and the use of the scaling powder and a welding strip in the assembly production process can be guided.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a method and system for detecting corrosion performance of a solar cell. Background Art

[0002] Photovoltaic power generation, as a high-quality green and clean energy, has developed rapidly in recent years, and various photovoltaic module products have emerged one after another. The electrode structure of solar cells in photovoltaic modules is mostly metal electrodes, which are prepared using metal slurry. The electrode structure and welding ribbon are welded to achieve current convergence of solar cells and electrical connection between solar cells. The production process of welding ribbon uses flux, and the production process of welding the welding ribbon to the solar cell also uses flux. After the module is prepared, the flux may remain on the solar cell. The flux contains acidic components, which corrode the electrodes and other structures of the solar cell.

[0003] Current corrosion detection of solar cells mostly focuses on the corrosion effect of the adhesive film on the solar cells, while ignoring the effect of the flux on the solar cells. How to detect the corrosion effect of the flux on the solar cells has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a method and a system for detecting the corrosion performance of solar cell sheets, which can accurately detect the corrosion effect of soldering flux on solar cell sheets.

[0005] In a first aspect, the present application provides a method for detecting corrosion performance of a solar cell, comprising:

[0006] Placing a solar cell in a soldering flux, using the solar cell as a working electrode and the soldering flux as an electrolyte;

[0007] Scanning the polarization curve of the working electrode to obtain the self-corrosion electrical parameters of the solar cell in the soldering flux;

[0008] Based on the self-corrosion electrical parameters, the corrosion performance of the solar cell in the flux environment is determined.

[0009] According to the method for detecting the corrosion performance of solar cells of the present application, by using the solar cell as the working electrode and the flux as the electrolyte, the polarization curve of the working electrode is scanned, the self-corrosion electrical parameters of the solar cell in the flux are obtained, and the corrosion performance of the solar cell in the flux environment is analyzed. The corrosion effect of the flux on the solar cell can be accurately detected, and the use of flux and solder strips in the component production process can be guided.

[0010] According to an embodiment of the present application, the solar cell comprises a cell body and a welding ribbon welded to the cell body.

[0011] According to an embodiment of the present application, determining the corrosion performance of the solar cell in the flux environment based on the self-corrosion electrical parameter includes:

[0012] The corrosion rate of the solar cell in the soldering flux environment is determined based on the self-corrosion current in the self-corrosion electrical parameter.

[0013] According to an embodiment of the present application, the self-corrosion current is positively correlated with the corrosion rate of the solar cell in the flux environment.

[0014] According to an embodiment of the present application, determining the corrosion performance of the solar cell in the flux environment based on the self-corrosion electrical parameter includes:

[0015] Based on the self-corrosion potential in the self-corrosion electrical parameter, the corrosion stability of the solar cell in the soldering flux environment is determined.

[0016] According to an embodiment of the present application, the self-corrosion potential is positively correlated with the corrosion stability of the solar cell in the flux environment.

[0017] According to one embodiment of the present application, the step of scanning the polarization curve of the working electrode to obtain the self-corrosion electrical parameters of the solar cell in the solder flux includes:

[0018] Performing an open circuit potential scan so that the working electrode and the electrolyte form an equilibrium potential;

[0019] Performing polarization curve scanning to obtain a polarization curve of the working electrode in the electrolyte;

[0020] Based on the polarization curve, the self-corrosion electrical parameters of the solar cell in the soldering flux are determined.

[0021] In a second aspect, the present application provides a system for detecting corrosion performance of a solar cell, the system comprising:

[0022] An electrochemical workstation and an electrode module connected to the electrochemical workstation, wherein the solar cell is placed in a soldering flux, the solar cell is used as a working electrode of the electrode module, and the soldering flux is used as an electrolyte;

[0023] A detection device, the detection device is connected to the electrochemical workstation, and the detection device is used to scan the polarization curve of the working electrode through the electrochemical workstation to obtain the self-corrosion electrical parameters of the solar cell in the flux; based on the self-corrosion electrical parameters, determine the corrosion performance of the solar cell in the flux environment.

[0024] According to the solar cell corrosion performance detection system of the present application, by using the solar cell as the working electrode and the flux as the electrolyte, the polarization curve of the working electrode is scanned to obtain the self-corrosion electrical parameters of the solar cell in the flux, and the corrosion performance of the solar cell in the flux environment is analyzed. The corrosion effect of the flux on the solar cell can be accurately detected, and the use of flux and solder strips in the component production process can be guided.

[0025] According to one embodiment of the present application, the electrode module further includes a reference electrode and an auxiliary electrode.

[0026] According to one embodiment of the present application, the auxiliary electrode is a graphite electrode, and the reference electrode is a saturated calomel electrode.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 This is one of the flow charts of the method for detecting corrosion performance of solar cells provided in the embodiments of the present application;

[0030] Figure 2 This is the second flow chart of the method for detecting corrosion performance of solar cells provided in the embodiment of the present application;

[0031] Figure 3 This is one of the structural schematic diagrams of the solar cell corrosion performance detection system provided in the embodiment of the present application;

[0032] Figure 4 This is the second structural schematic diagram of the solar cell corrosion performance detection system provided in the embodiment of the present application.

[0033] Reference numerals:

[0034] Electrochemical workstation 310 , electrode module 320 , working electrode 321 , auxiliary electrode 322 , reference electrode 323 , electrolyte 330 , and detection device 340 . DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] Reference below Figure 1-Figure 4 A method for detecting corrosion performance of a solar cell and a system for detecting corrosion performance of a solar cell according to an embodiment of the present application are described.

[0037] The method for detecting the corrosion performance of solar cells in the embodiment of the present application can detect the corrosion effect of flux on solar cells, determine the impact of flux used in the component production process on the reliability of solar cells and photovoltaic components, and help standardize the safe and efficient use of flux.

[0038] like Figure 1 As shown, the method for detecting corrosion performance of a solar cell according to an embodiment of the present application includes steps 110 to 130.

[0039] Step 110 , placing a solar cell in a soldering flux, with the solar cell serving as a working electrode 321 and the soldering flux serving as an electrolyte 330 .

[0040] It is understandable that the solar cell can conduct electricity, and the soldering flux can also conduct electricity. The solar cell is placed in the soldering flux to form an electrochemical system, and the electrode reaction is carried out through the input or output of electrical energy.

[0041] The working electrode 321 is also called a research electrode, and the reaction under study occurs on the working electrode 321 .

[0042] In this embodiment, the solar cell is used as the working electrode 321 and the flux is used as the electrolyte 330 to form an electrochemical system. The corrosion reaction of the flux to the solar cell occurs on the solar cell, and the location where the corrosion reaction occurs includes the solder strip and the cell body of the solar cell.

[0043] Step 120 , scanning the polarization curve of the working electrode 321 to obtain the self-corrosion electrical parameters of the solar cell in the flux.

[0044] The polarization curve is a curve representing the relationship between the electrode potential and the polarization current or the polarization current. The polarization curve of the working electrode 321 can characterize the reaction law of the reaction occurring on the working electrode 321 .

[0045] In this step, the working electrode 321 can be scanned for polarization curve by the electrochemical workstation 310, and the self-corrosion electrical parameters of the solar cell in the soldering flux can be analyzed based on the polarization curve scanned by the electrochemical workstation 310.

[0046] The electrochemical workstation 310 (Electrochemical workstation), also known as an electrochemical measurement system, is a measurement device that integrates multiple electrochemical analysis methods and is used to control and monitor the changes in the current, potential and other electrochemical parameters of an electrochemical cell.

[0047] The electrochemical workstation 310 can integrate a variety of electrochemical analysis methods, such as linear voltammetry, cyclic voltammetry, step voltammetry, pulse voltammetry, square wave voltammetry, etc., to study the kinetic process of electrode reactions, determine reaction rate constants and reaction mechanisms, etc.

[0048] In actual implementation, the electrochemical workstation 310 can be used as a constant potential instrument and a constant current instrument to control the potential and current of the electrochemical system composed of the solar cell and the flux, and monitor their changes to study the electrode reaction of the solar cell corrosion in the flux environment.

[0049] In this embodiment, the solar cell is used as the working electrode 321, and the flux is used as the electrolyte 330. The polarization curve of the working electrode 321 is scanned. The polarization curve can characterize the corrosion law of the flux on the solar cell. The self-corrosion electrical parameters of the solar cell in the flux can be obtained based on the polarization curve.

[0050] In actual implementation, the self-corrosion electrical parameters of the solar cell in the solder flux can be determined based on a curve that conforms to the Tafel relationship in the strong polarization region of the polarization curve, namely the Tafel curve.

[0051] For the Tafel curve, there is a linear relationship between the logarithm of the potential and the current. The slope of the Tafel curve represents the sensitivity of the electrode reaction rate to the potential change, that is, the gradient of the kinetic current changing with the potential. The size and positive and negative sign of the slope can reflect the type and rate of the electrode reaction.

[0052] In actual implementation, the self-corrosion electrical parameters may include the self-corrosion potential and the self-corrosion current at which the solar cell corrodes. The self-corrosion electrical parameters may reflect the stability of the solar cell in a flux environment.

[0053] Step 130: Determine the corrosion performance of the solar cell in a flux environment based on the self-corrosion electrical parameters.

[0054] In this step, the corrosion performance of the solar cell in the flux environment can be analyzed based on the self-corrosion electrical parameters of the solar cell in the flux to determine the corrosion effect of the flux on the solar cell.

[0055] In actual implementation, the electrochemical system composed of solar cells as working electrodes 321 and flux as electrolyte 330 can be used to accurately verify the corrosion effects of different fluxes on solar cells and solder strips, and the corrosion resistance of different solder strips to fluxes can also be accurately verified, so as to guide the use of flux and solder strips in the component production process.

[0056] In the related art, the effect of flux corrosion is examined by dripping flux onto solar cells and testing electrical performance data such as contact resistance before and after the solar cells. The method of dripping flux belongs to macro testing, and the dripping and electrical performance measurement process has large fluctuations. The corrosion performance test results obtained by this method have low accuracy and are difficult to accurately reflect the corrosion effect of flux on solar cells in actual components.

[0057] In the embodiment of the present application, a solar cell is used as a working electrode 321, and flux is used as an electrolyte 330. The polarization curve of the working electrode 321 is scanned to obtain the self-corrosion electrical parameters of the solar cell in the flux. The potential and current of the corrosion process are used to accurately show the corrosion effect of the flux on the solar cell and the solder strip on the solar cell at a microscopic level. The corrosion performance of the solar cell in the flux environment is analyzed by the self-corrosion electrical parameters. The corrosion performance test results are highly accurate and can accurately reflect the corrosion effect of the flux on the solar cell in the actual component.

[0058] Moreover, by replacing different fluxes as electrolyte 330, the corrosion effects of different fluxes on the soldering strips of solar cells and the cell body can be accurately verified. By replacing different soldering strips, the corrosion effects of fluxes on different soldering strips can be accurately verified, which has important guiding significance for the use of fluxes and soldering strips in the component production process.

[0059] According to the method for detecting the corrosion performance of solar cells provided in the embodiment of the present application, by using the solar cell as the working electrode 321 and the flux as the electrolyte 330, the polarization curve of the working electrode 321 is scanned to obtain the self-corrosion electrical parameters of the solar cell in the flux, and the corrosion performance of the solar cell in the flux environment is analyzed. The corrosion effect of the flux on the solar cell can be accurately detected, and the use of flux and solder strips in the component production process can be guided.

[0060] In some embodiments, the solar cell includes a cell body and a welding ribbon welded to the cell body.

[0061] In this embodiment, after preparing the battery cell body, a welding strip is welded on the battery cell body to obtain a solar cell, and a polarization curve is scanned using the solar cell as the working electrode 321, that is, the finished solar cell is used as the working electrode 321 to perform corrosion performance testing, and the test result is more real and accurate.

[0062] In actual implementation, the soldering ribbon can be welded to the electrode structure of the battery cell body, and flux is coated on the soldering ribbon to enhance the welding stability between the soldering ribbon and the battery cell body.

[0063] It is understandable that the corrosion effect of a certain type of flux on solar cells needs to be verified. In the process of preparing solar cells, this type of flux can be used to weld the solder strip to the cell body, and then the corrosion performance test can be carried out.

[0064] In the related art, the effect of flux corrosion is examined by dripping flux onto solar cells and testing electrical performance data such as contact resistance before and after the solar cells. However, the effect of intermetallic compounds generated during component welding is not taken into account, and it is impossible to accurately reflect the corrosion effect of flux on solar cells in actual components.

[0065] In the embodiment of the present application, finished solar cells are used for corrosion performance testing, and the finished solar cells welded with solder strips are used as working electrodes 321. The influence of intermetallic compounds generated during component welding and the interaction between intermetallic compounds and materials such as flux are taken into consideration. The corrosion effect of flux on solar cells and solder strips is more accurately demonstrated at a microscopic level, effectively improving the accuracy of corrosion performance test results, and accurately reflecting the corrosion effect of flux on solar cells in actual components.

[0066] It should be noted that in the electrochemical system, the solar cell is a finished product in the actual production process, and the flux can also be a finished product in the actual production process (no dilution or other operations are required). The polarization curve is made by the electrochemical workstation 310 to obtain the self-corrosion electrical parameters of the working electrode 321, accurately characterize the corrosion process, and then analyze the corrosion impact of the flux or solder strip to be tested.

[0067] The self-corrosion electrical parameters can reflect the stability of the solar cell in the flux environment. The self-corrosion electrical parameters can include the self-corrosion potential and the self-corrosion current at which the solar cell corrodes.

[0068] In some embodiments, step 130, determining the corrosion performance of the solar cell in the flux environment based on the self-corrosion electrical parameter, may include:

[0069] Based on the self-corrosion current in the self-corrosion electrical parameters, the corrosion rate of the solar cell in the flux environment is determined.

[0070] The self-corrosion current can represent the corrosion degree of the electrolyte 330 on the working electrode 321, that is, the corrosion degree of the soldering flux on the solar cell.

[0071] In this embodiment, the corrosion rate of the solar cell in the flux environment can be obtained by judging the time-varying rule of the corrosion degree of the solar cell by the flux according to the self-corrosion current in the self-corrosion electrical parameter.

[0072] In some embodiments, the self-corrosion current is positively correlated with the corrosion rate of the solar cell in a flux environment.

[0073] In this embodiment, a larger self-corrosion current indicates a faster corrosion rate of the working electrode 321 in the electrolyte 330 , that is, a faster corrosion rate of the solar cell in the solder flux.

[0074] For example, taking a solar cell as the working electrode 321 and flux A and flux B as the electrolyte 330 respectively, a polarization curve scan is performed on the working electrode 321 to obtain the self-corrosion electrical parameters of the solar cell in flux A and flux B.

[0075] The self-corrosion current of the solar cell in flux A is greater than that of the solar cell in flux B, indicating that the corrosion rate of the solar cell in flux A is faster. Flux B can be used in the component production process to help improve the reliability of the component.

[0076] In some embodiments, step 130, determining the corrosion performance of the solar cell in the flux environment based on the self-corrosion electrical parameter, may include:

[0077] Based on the self-corrosion potential in the self-corrosion electrical parameters, the corrosion stability of the solar cell in the flux environment is determined.

[0078] The self-corrosion potential can represent the corrosion tendency of the electrolyte 330 on the working electrode 321, that is, the corrosion tendency of the soldering flux on the solar cell.

[0079] It can be understood that the corrosion tendency can be expressed as more susceptible to corrosion and less susceptible to corrosion, reflecting the corrosion stability of the solar cell in the flux environment.

[0080] In this embodiment, the corrosion tendency of the soldering flux on the solar cell is judged according to the self-corrosion potential in the self-corrosion electrical parameter, and the corrosion stability of the solar cell in the soldering flux environment can be obtained.

[0081] In some embodiments, the self-corrosion potential is positively correlated with the corrosion stability of the solar cell in a flux environment.

[0082] In this embodiment, the self-corrosion potential is a negative number. The more negative the self-corrosion potential is, the easier it is for the working electrode 321 to be corroded in the electrolyte 330 , that is, the corrosion stability of the solar cell in the flux environment is poor.

[0083] For example, taking a solar cell as the working electrode 321 and flux A and flux B as the electrolyte 330 respectively, a polarization curve scan is performed on the working electrode 321 to obtain the self-corrosion electrical parameters of the solar cell in flux A and flux B.

[0084] The self-corrosion potential of the solar cell in flux A is lower than that in flux B, that is, the self-corrosion potential of the solar cell in flux A is more negative, indicating that the stability of the solar cell in flux A is worse. In the component production process, flux B can be selected to help improve the reliability of the component.

[0085] In some embodiments, Figure 2 As shown, step 120, scanning the polarization curve of the working electrode 321 to obtain the self-corrosion electrical parameters of the solar cell in the flux, includes:

[0086] Step 121, performing an open circuit potential scan so that the working electrode 321 and the electrolyte 330 form an equilibrium potential;

[0087] Step 122, performing polarization curve scanning to obtain a polarization curve of the working electrode 321 in the electrolyte 330;

[0088] Step 123: Determine the self-corrosion electrical parameters of the solar cell in the solder flux based on the polarization curve.

[0089] In this embodiment, an open circuit potential scan is performed before measuring the polarization curve, so that the working electrode 321 and the electrolyte 330 form an equilibrium potential, and then a polarization curve scan is performed. After the polarization curve is obtained, it is fitted to obtain self-corrosion electrical parameters such as self-corrosion potential and self-corrosion current.

[0090] In actual implementation, the solar cell is placed in the flux, and the open circuit potential scan and polarization curve scan are completed through the electrochemical workstation 310. The Tafel curve in the strong polarization region of the polarization curve is used to fit the self-corrosion electrical parameters of the solar cell in the flux.

[0091] It should be noted that the solar cell is placed in the flux to form an electrochemical system. When the electrochemical workstation 310 is used for testing, a three-electrode system or a two-electrode system can be used.

[0092] Taking a three-electrode system as an example, two specific embodiments are introduced below.

[0093] The three-electrode system refers to that the working electrode 321 , the reference electrode 323 and the auxiliary electrode 322 are all connected to the electrolyte 330 , and the three electrodes can form two circuits.

[0094] In this embodiment, if Figure 4 As shown, the solar cell is used as the working electrode 321, the auxiliary electrode 322 is a graphite electrode, the reference electrode 323 is a saturated calomel electrode, the three electrodes are connected to the electrolyte 330 of the flux, and the three electrodes are connected to the electrochemical workstation 310, through which the open circuit potential scanning, polarization curve scanning and other tasks are completed.

[0095] Before testing the Tafel curve, an open circuit potential scan is performed first to allow the electrode and the electrolyte 330 to form an equilibrium potential, and then a polarization curve scan is performed. After the polarization curve is obtained, the self-corrosion potential and the self-corrosion current are obtained by fitting.

[0096] Among them, the more negative the self-corrosion potential is, the greater the corrosion tendency of the working electrode 321 in this electrolyte 330 is, and the larger the self-corrosion current is, the faster the corrosion rate of the working electrode 321 in this electrolyte 330 is. The test results can verify the corrosion performance of the solder strip and flux, which is convenient for guiding the use of flux and solder strip in the component production process.

[0097] In some embodiments, the solder flux is verified, the solder strip of the working electrode 321 is fixed, and the Tafel curve is tested using different types of solder flux as the electrolyte 330 .

[0098] The A welding strip on the solar cell is fixed, the auxiliary electrode 322 is a graphite electrode, the reference electrode 323 is a saturated calomel electrode, and the electrolyte 330 is three kinds of fluxes, namely, A, B and C.

[0099] The electrochemical workstation 310 was started, the scanning potential range could be ±0.25 V, the scanning speed could be 50 mv / s, the Tafel curve was tested, and the self-corrosion electrical parameters were obtained by fitting as shown in Table 1.

[0100] Table 1

[0101] A flux B flux Acrylic flux Self-corrosion potential -410mv -440mv -470mv Self-corrosion current <![CDATA[2.5×10 -7 A]]> <![CDATA[5.0×10 -7 A]]> <![CDATA[2.3×10 -6 A]]>

[0102] Through comparative analysis in Table 1, among the three fluxes A, B and C, A is the most positive, B is the second, and C is the most negative, indicating that the A soldering strip on the solar cell has the least tendency to corrode in flux A, that is, flux A is weakly corrosive.

[0103] Among the three types of fluxes A, B, and C, A has the smallest self-corrosion current, followed by B and C has the largest current, indicating that after the A solder strip corrodes in flux A, the corrosion rate is the slowest, which indicates that the ability of flux A to further expand corrosion is relatively weak.

[0104] The advantages and disadvantages of the three fluxes are ranked as follows: A>B>C. The corrosion tendency of flux C is abnormally large and does not meet the introduction requirements in the component production process. Flux A and B can be used in the component production process to improve component quality and reliability.

[0105] In other embodiments, the soldering tape is verified, the fixed electrolyte 330 is the same solder flux, different types of soldering tapes are used, and the Tafel curve of the working electrode 321 is tested.

[0106] The working electrodes 321 are welding strips A, B and C respectively, the auxiliary electrode 322 is a graphite electrode, the reference electrode 323 is a saturated calomel electrode, and the electrolyte 330 is a tantalum flux.

[0107] The electrochemical workstation 310 was started, the scanning potential range could be ±0.25 V, the scanning speed could be 50 mv / s, the Tafel curve was tested, and the self-corrosion electrical parameters were obtained by fitting as shown in Table 2.

[0108] Table 2

[0109] A welding strip B welding strip C welding strip Self-corrosion potential -423mv -476mv -454mv Self-corrosion current <![CDATA[2.6×10 -7 A]]> <![CDATA[1.8×10 -6 A]]> <![CDATA[5.4×10 -7 A]]>

[0110] Through comparative analysis in Table 2, among the three types of welding strips A, B, and C, A is the most positive, followed by C, and B is the most negative, indicating that welding strip electrode A has the smallest corrosion tendency in the same flux D, which means that welding strip A has better corrosion resistance.

[0111] Among the three types of welding strips A, B, and C, A has the smallest self-corrosion current, followed by C, and B has the largest current, indicating that the corrosion rate of welding strip electrode A is the slowest after corrosion occurs in the same flux D, which can indicate that welding strip A has a stronger ability to resist further corrosion expansion.

[0112] The advantages and disadvantages of the three types of solder strips are ranked as follows: A>C>B. The corrosion tendency of B solder strip is abnormally large and does not meet the introduction requirements in the component production process. A and C solder strips can be used in the component production process to improve the quality and reliability of the components.

[0113] With the solar cell as the working electrode 321 and the flux as the electrolyte 330, the polarization curve of the working electrode 321 is scanned to obtain the self-corrosion electrical parameters of the solar cell in the flux, and the corrosion performance of the solar cell in the flux environment is analyzed. The corrosion effect of the flux on the solar cell can be accurately detected. By replacing different fluxes as the electrolyte 330, the corrosion effect of different fluxes on the solar cell and the solder strip can be accurately verified. By replacing different solder strips, the corrosion effect of the flux on different solder strips can be accurately verified, which has important guiding significance for the use of flux and solder strips in the component production process.

[0114] The embodiment of the present application also provides a system for detecting the corrosion performance of a solar cell. The system for detecting the corrosion performance of a solar cell can be used to execute the above-mentioned method for detecting the corrosion performance of a solar cell.

[0115] like Figure 3 As shown, the detection system for corrosion performance of solar cell comprises: an electrochemical workstation 310 , an electrode module 320 connected to the electrochemical workstation 310 , and a detection device 340 , wherein the detection device 340 is connected to the electrochemical workstation 310 .

[0116] In this embodiment, the solar cell is placed in the soldering flux, the solar cell is used as the working electrode 321 of the electrode module 320, and the soldering flux is used as the electrolyte 330, forming an electrochemical system.

[0117] The detection device 340 is used to scan the polarization curve of the working electrode 321 through the electrochemical workstation 310 to obtain the self-corrosion electrical parameters of the solar cell in the flux; based on the self-corrosion electrical parameters, the corrosion performance of the solar cell in the flux environment is determined.

[0118] The electrochemical workstation 310 is a measuring device that integrates multiple electrochemical analysis methods and is used to control and monitor the changes in the current, potential and other electrochemical parameters of the electrochemical cell.

[0119] In actual implementation, the electrochemical workstation 310 can be used as a constant potential instrument and a constant current instrument to control the potential and current of the electrochemical system composed of the solar cell and the flux, and monitor their changes to study the electrode reaction of the solar cell corrosion in the flux environment.

[0120] The detection device 340 may be a computer or other equipment connected to the electrochemical workstation 310 , which may send operation instructions to the electrochemical workstation 310 , provide a user operation interactive interface, and display feedback data to the user.

[0121] In this embodiment, the solar cell is used as the working electrode 321, and the flux is used as the electrolyte 330. The detection device 340 scans the polarization curve of the working electrode 321 through the electrochemical workstation 310. The polarization curve can characterize the corrosion law of the flux on the solar cell. The detection device 340 or the electrochemical workstation 310 can obtain the self-corrosion electrical parameters of the solar cell in the flux based on the polarization curve analysis.

[0122] In actual implementation, the self-corrosion electrical parameters of the solar cell in the solder flux can be determined based on a curve that conforms to the Tafel relationship in the strong polarization region of the polarization curve, namely the Tafel curve.

[0123] According to the detection system for the corrosion performance of solar cells provided in the embodiment of the present application, by using the solar cell as the working electrode 321 and the flux as the electrolyte 330, the polarization curve of the working electrode 321 is scanned to obtain the self-corrosion electrical parameters of the solar cell in the flux, and the corrosion performance of the solar cell in the flux environment is analyzed. The corrosion effect of the flux on the solar cell can be accurately detected, and the use of flux and solder strips in the component production process can be guided.

[0124] In some embodiments, the electrode module 320 further includes a reference electrode 323 and an auxiliary electrode 322 .

[0125] In this embodiment, the electrode module 320 has a working electrode 321, a reference electrode 323 and an auxiliary electrode 322, which belongs to a three-electrode system and can simultaneously measure polarization current, potential and other information. The two loops formed in the three-electrode system can improve the measurement accuracy of the polarization curve.

[0126] like Figure 4 As shown, the solar cell is used as the working electrode 321, the auxiliary electrode 322 is a graphite electrode, the reference electrode 323 is a saturated calomel electrode, the three electrodes are connected to the electrolyte 330 of the flux, and the three electrodes are connected to the electrochemical workstation 310, through which the open circuit potential scanning, polarization curve scanning and other tasks are completed.

[0127] In some embodiments, the auxiliary electrode 322 is a graphite electrode, and the reference electrode 323 is a saturated calomel electrode.

[0128] The graphite electrode is based on the conductivity and chemical stability of graphite. During the reaction, ions in the electrolyte 330 will be adsorbed by the graphite electrode. The graphite electrode has high stability and can withstand extreme environments such as high temperature and high pressure.

[0129] The saturated calomel electrode is composed of three parts: mercury, calomel and saturated potassium chloride solution. Mercury and calomel are the active substances of the electrode, while the saturated potassium chloride solution provides an ion conductive environment. The saturated calomel electrode has stable potential characteristics at a certain temperature.

[0130] The potential of the saturated calomel electrode is very stable and not easily affected by external factors. It can provide a reliable potential reference. The saturated calomel electrode has a wide measurement range and is easy to maintain.

[0131] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0132] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0133] In the description of the present application, “plurality” means two or more.

[0134] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0135] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0136] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0137] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for detecting corrosion performance of a solar cell, characterized in that: include: Placing a solar cell in a soldering flux, using the solar cell as a working electrode and the soldering flux as an electrolyte; Scanning the polarization curve of the working electrode to obtain the self-corrosion electrical parameters of the solar cell in the soldering flux; Based on the self-corrosion electrical parameters, the corrosion performance of the solar cell in the flux environment is determined.

2. The method for detecting corrosion performance of a solar cell according to claim 1, characterized in that: The solar cell comprises a cell body and a welding strip welded to the cell body.

3. The method for detecting corrosion performance of a solar cell according to claim 1 or 2, characterized in that: The step of determining the corrosion performance of the solar cell in the flux environment based on the self-corrosion electrical parameter includes: The corrosion rate of the solar cell in the soldering flux environment is determined based on the self-corrosion current in the self-corrosion electrical parameter.

4. The method for detecting corrosion performance of a solar cell according to claim 3, characterized in that: The self-corrosion current is positively correlated with the corrosion rate of the solar cell in the flux environment.

5. The method for detecting corrosion performance of a solar cell according to claim 1 or 2, characterized in that: The step of determining the corrosion performance of the solar cell in the flux environment based on the self-corrosion electrical parameter includes: Based on the self-corrosion potential in the self-corrosion electrical parameter, the corrosion stability of the solar cell in the soldering flux environment is determined.

6. The method for detecting corrosion performance of a solar cell according to claim 5, characterized in that: The self-corrosion potential is positively correlated with the corrosion stability of the solar cell in the flux environment.

7. The method for detecting corrosion performance of a solar cell according to claim 1 or 2, characterized in that: The step of scanning the polarization curve of the working electrode to obtain the self-corrosion electrical parameters of the solar cell in the solder flux includes: Performing an open circuit potential scan so that the working electrode and the electrolyte form an equilibrium potential; Performing polarization curve scanning to obtain a polarization curve of the working electrode in the electrolyte; Based on the polarization curve, the self-corrosion electrical parameters of the solar cell in the soldering flux are determined.

8. A solar cell corrosion performance detection system, characterized in that: include: An electrochemical workstation and an electrode module connected to the electrochemical workstation, wherein the solar cell is placed in a soldering flux, the solar cell is used as a working electrode of the electrode module, and the soldering flux is used as an electrolyte; A detection device, the detection device is connected to the electrochemical workstation, and the detection device is used to scan the polarization curve of the working electrode through the electrochemical workstation to obtain the self-corrosion electrical parameters of the solar cell in the flux; based on the self-corrosion electrical parameters, determine the corrosion performance of the solar cell in the flux environment.

9. The solar cell corrosion performance detection system according to claim 8, characterized in that: The electrode module also includes a reference electrode and an auxiliary electrode.

10. The solar cell corrosion performance detection system according to claim 9, characterized in that: The auxiliary electrode is a graphite electrode, and the reference electrode is a saturated calomel electrode.

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