Electric leakage tester for detecting leakage current of solar cell

Abstract

The utility model provides an electric leakage tester for detecting leakage current of a solar cell, which can realize electric leakage detection of the solar cell in the production process of the solar cell, and is lower in environmental requirement and low in cost. Comprising a test box body, a sample groove and a display screen are adjacently arranged on a table top of the test box body, a battery piece to be tested is arranged in the sample groove, one side of the test box body is rotatably connected with a machine cover matched with the sample groove in size, and an upper seat is arranged in the machine cover; the upper seat is provided with an upper probe, and the sample groove is internally provided with a lower probe corresponding to the upper probe, so that when the machine cover covers the test box body, the upper probe and the lower probe are respectively contacted with the surface of the battery piece to be tested, and an equivalent circuit is formed; the test box body is internally provided with a control panel which is connected with one another, and the switching power supply, the equivalent circuit and the display screen are all connected with the control panel.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cell detection, in particular to a leakage tester used for detecting leakage current of solar cells. Background Art

[0002] Solar power generation has become the most sought-after energy source due to its environmentally friendly, efficient, energy-saving, and renewable characteristics. A solar cell is a giant semiconductor diode that converts energy based on semiconductor materials. Currently, crystalline silicon solar cells dominate the photovoltaic industry. Crystalline silicon solar cells are primarily divided into two types: one produced by cutting cylindrical single-crystal silicon rods into single-crystal silicon wafers; the other is produced by casting multicrystalline silicon wafers.

[0003] During the production of crystalline silicon solar cells, some impurities and defects will be formed inside the cell due to the silicon wafer itself or the process, and these impurities and defects will act as recombination centers. The recombination process is always accompanied by the directional movement of carriers to generate a small current, which will lead to local leakage and even short circuit. With the increasing use of crystalline silicon cells, the problem of local leakage of crystalline silicon solar cells has gradually attracted people's attention and attention. Therefore, the analysis and discussion of the causes of leakage of crystalline silicon cells has become one of the hot spots in crystalline silicon cell research. In summary, the local leakage of crystalline silicon wafers during the production process mainly includes: 1) leakage current through the PN junction; 2) leakage current along the microscopic channels formed along microscopic cracks or grain boundaries after metallization treatment; 3) surface leakage current along the edge of the cell; In summary, the existence of leakage may cause the prepared components to have the risk of hot spots, which requires leakage detection during the cell production process, thereby improving the cell production yield. At present, commonly used leakage detection instruments include infrared thermal imagers. Their detection principle is: by applying a reverse bias to the battery, a current loop is formed on the battery cell. When there is leakage in an area, the current in that area will be particularly large, and the heat generated will be relatively large. The infrared imager can convert the different heat generated on the surface of the silicon wafer into an electrical signal, and then form a thermal image on the display. It can identify abnormal heating areas and then determine the leakage area. However, in order to obtain a more accurate thermal image, the accuracy of the infrared imager and the detection environment are relatively high. At the same time, it is impossible to quantitatively analyze the size of the leakage current, which makes it difficult to accurately analyze the cause of the leakage current. Utility Model Content

[0004] In view of the above problems, the present invention provides a leakage tester for detecting leakage current of solar cell, which can realize leakage detection of solar cell in the production process of solar cell, has low environmental requirements and low cost.

[0005] The utility model adopts the following technology: a leakage tester for detecting leakage current of solar cells, comprising a test box, a sample slot and a display screen adjacently arranged on a table top of the test box, a cell to be tested being placed in the sample slot, a machine cover rotatably connected to one side of the test box with a machine cover matching the size of the sample slot, an upper seat being housed in the machine cover; an upper probe being provided on the upper seat, a lower probe corresponding to the upper probe being housed in the sample slot, so that when the machine cover is closed on the test box, the upper probe and the lower probe respectively contact the surface of the cell to be tested and form an equivalent circuit; a control board and a switching power supply connected thereto are housed in the test box, and the equivalent circuit and the display screen are both connected to the control board.

[0006] Furthermore, a connecting plate is installed on the upper surface of the upper seat, and a supporting plate integral with the connecting plate is bent and led out from the side of the connecting plate. The supporting plate is L-shaped and connected to the inner side of the cover.

[0007] Furthermore, a fixing plate is installed on the test box body, a telescopic rod is provided between the upper seat and the inner side of the machine cover, one end of the telescopic rod is rotatably connected to the fixing plate through a pin, a sleeve is provided on the inner side of the machine cover, and the other end of the telescopic rod is connected to the sleeve through a connecting bolt;

[0008] Furthermore, a frame-shaped handle is installed on the outside of the cover, and the handle is rotatably connected to the test box;

[0009] Furthermore, the sample tank is provided with a base, the base is provided with a sample stage for placing the cell to be tested, the lower probe is provided on the base, and the top end of the lower probe passes through the sample stage and contacts the bottom surface of the cell to be tested;

[0010] Furthermore, the test box is provided with heat dissipation holes; the test box is provided with a power socket and a switch button, and the power socket and the switch button are both connected to the switching power supply.

[0011] The beneficial effect of the present invention is that after the cover is closed on the test box, the upper probe and the lower probe are respectively in contact with the surface of the battery cell to be tested, and the equivalent circuit formed by the three is connected to the control board, so that the control board can obtain the resistance value of the corresponding part on the battery cell to be tested, and can locate the leakage direction according to the resistance value of different parts, and can be displayed on the display screen interface. The operation is simpler, the environmental requirements are lower, and it has good economic use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of the utility model in an open state;

[0013] Figure 2yes Figure 1 A schematic diagram of the enlarged structure at position I;

[0014] Figure 3 This is a structural diagram of the utility model in a closed state;

[0015] Figure 4 It is a connection diagram of the present utility model. DETAILED DESCRIPTION

[0016] like Figures 1 to 4 As shown, the utility model is a leakage tester for detecting leakage current of solar cells, comprising a test box 1, a sample slot 2 and a display screen 3 are adjacently arranged on the table of the test box 1, the display screen 3 adopts an integrated touch screen, the cell 21 to be tested is placed in the sample slot 2, and a machine cover 4 that matches the size of the sample slot 2 is rotatably connected to one side of the test box 1. Specifically, a frame-shaped handle 5 is assembled on the outer side of the machine cover 4, and the handle 5 is rotatably connected to the test box 1; an upper seat 6 is installed in the machine cover 4; an upper probe 7 is provided on the upper seat 6, and a lower probe 8 corresponding to the upper probe 7 is installed in the sample slot 2, so that when the machine cover 4 is closed on the test box 1, the upper probe 7, The lower probes 8 are in contact with the surface of the battery cell to be tested and form an equivalent circuit; the upper probes 7 and the lower probes 8 are both beryllium copper gold-plated probes, with a large test resistance range, high resistance accuracy and resolution, and at the same time, fast sampling speed, no damage to the battery cell, making data testing and processing more efficient; the number of upper probes 7 and lower probes 8 can be set according to actual conditions, so as to achieve accurate collection of resistance information of different parts of the battery cell to be tested; the test box 1 is equipped with a connected control board 9 and a switching power supply 10, the equivalent circuit and the display screen 3 are both connected to the control board 9, and the function of the switching power supply 10 is to convert 220V AC voltage into 24V DC to power the equipment.

[0017] A connecting plate 11 is mounted on the upper surface of the upper seat 6, and a support plate 12 integral with the connecting plate 11 is bent from the side thereof. The support plate 12 is L-shaped and is connected to the inner side of the cover 4. A fixing plate 13 is mounted on the test box 1, and a telescopic rod 14 is provided between the upper seat 6 and the inner side of the cover 4. One end of the telescopic rod 14 is rotatably connected to the fixing plate 13 via a pin shaft. A sleeve 15 is provided on the inner side of the cover 4, and the other end of the telescopic rod 14 is connected to the sleeve 15 via a connecting bolt.

[0018] The sample tank 2 is equipped with a base 16, on which a sample table 17 for placing the battery cell to be tested is installed. The lower probe 8 is installed on the base 16, and the top of the lower probe 8 passes through the sample table 17 and contacts the bottom surface of the battery cell to be tested; the sample table 17 is designed to the commonly used battery cell size and can be customized to meet the testing requirements of 182 and 210mm specification battery cells.

[0019] The test box 1 is provided with heat dissipation holes 18 ; the test box 1 is provided with a power socket 19 and a switch button 20 , which are both connected to the switching power supply 10 .

[0020] In the present invention, when leakage detection is required, the cover 4 is opened, the battery cell to be tested is placed on the sample table 17, and the cover 4 is closed on the test box 1. The upper probe 7 and the lower probe 8 are respectively in contact with the surface of the battery cell to be tested. The upper probe 7 and the lower probe 8 are in contact with the battery cell to be tested to form an equivalent circuit. The control board is connected to the equivalent circuit. Then the cover 4 is closed and waits for measurement. The switching power supply 10 is turned on by the switch button 20. During the test, the battery cell to be tested is regarded as an equivalent resistor, and the control board 9 detects the voltage at both ends of the equivalent resistor. The equivalent resistance value is calculated by the existing equivalent resistance method and displayed on the display interface. According to the size of the measured resistance value (the resistance threshold value can be set according to the situation. If the measured resistance value is greater than the threshold, it is determined to be leakage, otherwise it is not leakage), the leakage situation of different areas of the battery cell to be tested can be judged. In this way, not only can the overall judgment of whether the entire battery cell to be tested is leaking can be made, but the leakage part can also be accurately located, and the leakage situation of the battery cell can be accurately and efficiently judged. The operation is simpler, the environmental requirements are lower, the cost is lower, and it is also easy to carry.

[0021] During the test, set appropriate parameters for sampling area, speed, and number of times according to actual needs to make the measurement results more accurate.

[0022] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0023] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A leakage tester for detecting leakage current of solar cells, characterized by: The invention comprises a test box body, a sample slot and a display screen are adjacently arranged on the table of the test box body, and a battery cell to be tested is placed in the sample slot. A machine cover matching the size of the sample slot is rotatably connected to one side of the test box body, and an upper seat is installed in the machine cover; an upper probe is provided on the upper seat, and a lower probe corresponding to the upper probe is installed in the sample slot, so that when the machine cover is closed on the test box body, the upper probe and the lower probe respectively contact the surface of the battery cell to be tested and form an equivalent circuit; a connected control board and a switching power supply are installed in the test box body, and the equivalent circuit and the display screen are both connected to the control board.

2. The leakage current tester for detecting leakage current of a solar cell according to claim 1, characterized in that: The upper surface of the upper seat is provided with a connecting plate, the side of the connecting plate is bent to lead out a supporting plate integral with it, the supporting plate is L-shaped, and the supporting plate is connected to the inner side of the machine cover.

3. The leakage current tester for detecting leakage current of a solar cell according to claim 2, characterized in that: A fixing plate is installed on the test box body, a telescopic rod is provided between the upper seat and the inner side of the machine cover, one end of the telescopic rod is rotatably connected to the fixing plate through a pin shaft, a sleeve is provided on the inner side of the machine cover, and the other end of the telescopic rod is connected to the sleeve through a connecting bolt.

4. The leakage current tester for detecting leakage current of a solar cell according to claim 1, characterized in that: A frame-shaped handle is mounted on the outside of the cover, and the handle is rotatably connected to the test box.

5. The leakage current tester for detecting leakage current of a solar cell according to claim 1, characterized in that: The sample tank is provided with a base, on which a sample stage for placing the cell to be tested is provided. The lower probe is provided on the base, and the top end of the lower probe passes through the sample stage and contacts the bottom surface of the cell to be tested.

6. The leakage current tester for detecting leakage current of a solar cell according to claim 1, characterized in that: The test box body is provided with heat dissipation holes; the test box body is provided with a power plug interface and a switch button, and the power plug interface and the switch button are both connected to the switching power supply.

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