Back contact cell iv test bench

Abstract

The utility model relates to solar cell testing technical field discloses a back contact cell IV test platform, including the platform main part for bearing back contact cell piece, the probe row platform is lifted and arranged in the platform main part bottom, the probe row platform upper surface installs several probe rows, and the platform main part top is equipped with the probe hole that guides the probe row movement. The utility model places back contact cell piece on the platform main part top, sets up the probe row platform in the platform main part bottom lifting, and the probe row platform drives the probe row and moves up to be level with the probe hole top, makes the probe row and back contact cell piece's metal grid line complete contact, has solved the existing back contact cell IV test platform in the probe row and the problem of battery back metal grid line contact failure, has improved the accuracy of test result.

Description

Technical Field

[0001] This utility model relates to the field of solar cell testing technology, and more specifically, to a back-contact cell IV test stage. Background Technology

[0002] Back-contact (BC) cells, characterized by high conversion efficiency and low manufacturing cost, are a key development direction in the photovoltaic industry today. Their emitter, surface field, and metal electrodes are all located on the back of the cell and arranged in an interdigital pattern. The front surface of the cell is free of any grid lines that obstruct the light, maximizing the utilization of incident light, reducing optical losses, resulting in a larger effective power generation area, high conversion efficiency, and a more aesthetically pleasing appearance. Therefore, the current-voltage (IV) test of BC cells cannot be performed by directly pressing the front surface with a probe array like HJT (heterojunction) or TopCon cells; it must be performed on the back of the cell.

[0003] In this technical field, there is currently no standardized IV test platform for back-contact batteries in China. IV test platforms from different companies vary, but they generally suffer from poor contact between the probe array and the metal grid lines on the back of the battery, leading to inaccurate and highly volatile fill factor (FF) test results. For example, in platforms where the probe array is pressed down by a cylinder, the air pressure affects the degree of pressing down, thus impacting the contact condition.

[0004] Therefore, it is necessary to propose a back-contact battery IV test stage to at least partially solve the problems existing in the prior art. Utility Model Content

[0005] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To address the aforementioned issues, this utility model discloses a back-contact battery IV test platform; it includes a platform body for supporting back-contact battery cells, a probe row platform is vertically mounted at the bottom of the platform body, several probe rows are mounted on the upper surface of the probe row platform, and a probe hole is provided at the top of the platform body to guide the movement of the probe rows.

[0007] Preferably, a lifting drive assembly is provided on the platform body. The lifting drive assembly includes a drive motor, a transmission mechanism, and lifting rods. The drive motor is installed on the rear side of the platform body, and two lifting rods are slidably disposed on the left and right sides of the platform body. The lifting rods are connected to the probe row platform, and the transmission mechanism is connected between the drive motor and the lifting rods.

[0008] Preferably, the upper surface of the platform body is provided with a number of negative pressure adsorption holes, the bottom of the negative pressure adsorption holes are connected and connected to an air pipe on one side of the platform body, and the air pipe is connected to a negative pressure device.

[0009] Preferably, the air pipe is equipped with an automatic air control valve.

[0010] Preferably, the top of the stage body is provided with four silicon wafer detectors, which are arranged around the stage body and adapted to the size of the back contact cell.

[0011] Preferably, the silicon wafer detector is configured as a photoelectric sensor that emits a sensing signal when the edge of the back contact cell blocks the silicon wafer detector.

[0012] Preferably, a control center is provided on the main body of the stage, and the control center is electrically connected to the drive motor, the automatic air control valve and the silicon wafer detector.

[0013] Preferably, a control valve switch and a probe row platform switch are provided on the front side of the platform body, and the control valve switch and the probe row platform switch are electrically connected to the control center.

[0014] Preferably, the bottom of the platform body is provided with a lower groove to accommodate the probe row platform, and the side of the platform body is provided with a side groove to accommodate the lifting rod.

[0015] Preferably, the negative pressure adsorption holes and probe holes are arranged alternately.

[0016] Preferably, the transmission mechanism includes:

[0017] The first rotating shaft is connected to the output shaft of the drive motor. The drive motor is a dual-axis motor, and there are two corresponding first rotating shafts. The two first rotating shafts protrude from the left and right sides of the platform body, respectively. The ends of the first rotating shafts are connected to the first pulleys.

[0018] A support base is connected to the rear side of the platform body, and a first rotating shaft passes through the support base and is rotatably connected to it;

[0019] The second rotating shaft is connected to the side groove. The second rotating shaft is connected to the second pulley and the gear. The second pulley is connected to the first pulley through the synchronous belt. The side of the lifting rod is provided with transmission teeth, and the gear meshes with the side of the lifting rod.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] This embodiment provides a back-contact battery IV test stage, in which the back-contact battery cell is placed above the main body of the stage, and a probe row stage is raised and lowered at the bottom of the main body of the stage. The probe row stage moves the probe row upward until it is level with the top of the probe hole, so that the probe row makes complete contact with the metal grid lines of the back-contact battery cell. This solves the problem of poor contact between the probe row and the metal grid lines on the back of the battery in the existing back-contact battery IV test stage, and improves the accuracy of the test results.

[0022] The present invention provides a back contact battery IV test platform. Other advantages, objectives and features of the present invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of the present invention. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a top view of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the electrical connection structure of this utility model;

[0028] Figure 5 This is a schematic diagram of the cross-sectional structure of this utility model;

[0029] Figure 6 This utility model Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0030] In the diagram: 100. Stage body; 1. Drive motor; 2. Control center; 3. Lifting rod; 4. Silicon wafer detector; 5. Probe hole; 6. Probe row; 7. Probe row stage; 8. Automatic air control valve; 9. Air pipe; 10. Air control valve switch; 11. Probe row stage switch; 12. Lower groove; 13. Side groove; 14. First rotating shaft; 15. Support base; 16. First pulley; 17. Second rotating shaft; 18. Second pulley; 19. Gear; 20. Synchronous belt. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] Example

[0033] The present invention will now be further described with reference to the accompanying drawings.

[0034] like Figures 1-4 As shown, this embodiment provides a back contact battery IV test platform, including a platform body 100 for supporting back contact battery cells, a probe row platform 7 is provided at the bottom of the platform body 100, a plurality of probe rows 6 are installed on the upper surface of the probe row platform 7, and a probe hole 5 is provided at the top of the platform body 100 to guide the movement of the probe rows 6.

[0035] The working principle and beneficial effects of this utility model are as follows:

[0036] This embodiment provides a back-contact battery IV test platform. During testing, the back-contact battery cell is placed above the platform body 100, and the probe row platform 7 is driven to move upward. The probe row 6 is installed on the probe row platform 7 and can move upward synchronously with the probe row platform 7. The probe row 6 is set at the corresponding position of the probe hole 5. Each probe in the probe row 6 moves upward vertically under the guidance of the probe hole 5 until it is level with the top of the probe hole 5, so that the probe row 6 makes complete contact with the metal grid lines of the back-contact battery cell. This solves the problem of poor contact between the probe row 6 and the metal grid lines on the back of the battery in the existing back-contact battery IV test platform, and improves the accuracy of the test results.

[0037] In one embodiment, a lifting drive assembly is provided on the platform body 100. The lifting drive assembly includes a drive motor 1, a transmission mechanism and lifting rods 3. The drive motor 1 is installed on the rear side of the platform body 100. The two lifting rods 3 are slidably disposed on the left and right sides of the platform body 100 and are connected to the probe row platform 7. The transmission mechanism is connected between the drive motor 1 and the lifting rods 3.

[0038] The working principle and beneficial effects of the above scheme are as follows:

[0039] The drive motor 1 is connected to the lifting rod 3 through a transmission mechanism, which converts the rotational motion of the output shaft of the drive motor 1 into the lifting motion of the lifting rod 3. The lifting rod 3 drives the probe mounting platform 7 to move to achieve lifting.

[0040] In one embodiment, the upper surface of the platform body 100 is provided with a plurality of negative pressure adsorption holes, the bottom of the negative pressure adsorption holes are connected and connected to the air pipe 9 on one side of the platform body 100, and the air pipe 9 is connected to the negative pressure device.

[0041] The negative pressure adsorption holes and probe holes 5 are arranged alternately.

[0042] The working principle and beneficial effects of the above scheme are as follows:

[0043] During the test, the negative pressure device is connected to the negative pressure adsorption hole through the air pipe 9, generating a negative pressure adsorption force on the upper surface of the platform body 100, adsorbing the back contact battery cell onto the surface of the platform body 100 and making contact with the probe head, playing a dual protection role and ensuring good contact between the probe and the back contact battery cell.

[0044] In one embodiment, an automatic air control valve 8 is provided on the air pipe 9. The automatic air control valve 8 can control the opening and closing of the air pipe 9.

[0045] In one embodiment, the top of the stage body 100 is provided with four silicon wafer detectors 4, which are respectively arranged around the stage body 100 and adapted to the size of the back contact cell.

[0046] In one embodiment, the silicon wafer detector 4 is configured as a photoelectric sensor, which emits a sensing signal when the edge of the back contact cell blocks the silicon wafer detector 4.

[0047] The working principle and beneficial effects of the above scheme are as follows:

[0048] Four silicon wafer detectors 4 are mounted on the stage body 100, and the silicon wafer detectors 4 do not protrude from the upper surface of the stage body 100. The silicon wafer sensors can be set as photoelectric sensors, such as infrared sensors. The method of using photoelectric sensors to detect the position of the test piece is existing technology and will not be described in detail here.

[0049] The silicon wafer detector 4 can automatically identify the position of the back contact cell. When the back contact cell is placed in the correct position, all four silicon wafer detectors 4 will simultaneously sense the back contact cell and output a signal to the control center 2 to start the test. When the back contact position is off, the four silicon wafer detectors 4 will not simultaneously sense the back contact cell, that is, all four silicon wafer detectors 4 will not output a signal to the control center 2 and the test will not be started.

[0050] In one embodiment, a control center 2 is provided on the stage body 100, and the control center 2 is electrically connected to the drive motor 1, the air control valve switch 10 and the silicon wafer detector 4.

[0051] The working principle and beneficial effects of the above scheme are as follows:

[0052] The control center 2 receives signals from the silicon wafer detectors 4. When all four detectors 4 emit signals, it indicates that the back contact battery position is accurate. The control center 2 then initiates the test, controlling the drive motor 1 to operate, causing the lifting rod 3 to move the probe mounting platform 7 up and down. Simultaneously, it controls the automatic air control valve 8 to open, opening the air pipe 9 channel and generating negative pressure at the negative pressure adsorption hole to stably adsorb the back contact battery cell. After the test is completed, the control center 2 controls the drive motor 1 to rotate in the opposite direction to reset the probe mounting platform 7, and the automatic air control valve 8 closes.

[0053] Through the above structural design, the control center 2 detects the position of the back contact cell through the silicon wafer detector 4, and automatically controls the operation of the drive motor 1 and the automatic air control valve 8, so that the IV test stage has the functions of automatically identifying the back contact cell, automatically raising and lowering the probe row 6 and automatically ventilating, thus realizing the automated operation of the IV test stage.

[0054] In one embodiment, a control valve switch 10 and a probe row stage switch 11 are provided on the front side of the stage body 100, and the control valve switch 10 and the probe row stage switch 11 are electrically connected to the control center 2.

[0055] The working principle and beneficial effects of the above scheme are as follows:

[0056] By setting the gas control valve switch 10 and the probe tray switch 11, the operator can manually control the operation of the drive motor 1 and the automatic gas control valve 8, which is suitable for both online and offline IV testing needs.

[0057] In one embodiment, the bottom of the platform body 100 is provided with a lower groove 12 for accommodating the probe row platform 7, and the side of the platform body 100 is provided with a side groove 13 for accommodating the lifting rod 3.

[0058] The working principle and beneficial effects of the above scheme are as follows:

[0059] The lower groove 12 is used to accommodate the probe row platform 7 and guide its lifting and lowering. The side groove 13 is used to accommodate the lifting rod 3 and guide its lifting and lowering. By placing the probe row 6 inside the platform body 100, it can be effectively protected from damage by external objects and ensure the accurate positioning of the probe row 6 during lifting and lowering.

[0060] like Figure 5 , Figure 6 As shown, in one embodiment, the transmission mechanism includes:

[0061] The first rotating shaft 14 is connected to the output shaft of the drive motor 1. The drive motor 1 is a dual-axis motor. There are two first rotating shafts 14, and the two first rotating shafts 14 protrude from the left and right sides of the platform body 100 respectively. The end of the first rotating shaft 14 is connected to the first pulley 16.

[0062] Support base 15 is connected to the rear side of platform body 100, and first rotating shaft 14 passes through support base 15 and is rotatably connected to it;

[0063] The second rotating shaft 17 is connected to the side groove 13. The second rotating shaft 17 is connected to the second pulley 18 and the gear 19. The second pulley 18 is connected to the first pulley 16 through the synchronous belt 20. The side of the lifting rod 3 is provided with transmission teeth, and the gear 19 is meshed with the side of the lifting rod 3.

[0064] The working principle and beneficial effects of the above scheme are as follows:

[0065] When drive motor 1 runs in the forward direction, its two output shafts rotate in the forward direction, driving the first rotating shaft 14 to rotate. The first pulley 16 and the second pulley 18 are connected by a synchronous belt 20 to form a belt drive structure, causing the second rotating shaft 17 to rotate synchronously. The gear 19 rotates and, through meshing with the transmission teeth on the side of the lifting rod 3, drives the lifting rod 3 to rise. Conversely, when drive motor 1 runs in the reverse direction, its two output shafts rotate in opposite directions, driving the lifting rod 3 to fall. The synchronous operation of the transmission mechanism on both sides ensures the synchronous lifting and lowering of both sides of the probe row platform 7, reduces displacement deviation on both sides, ensures the movement accuracy of the probe row 6, and prevents its deformation and breakage.

[0066] In one embodiment, an IV test stage in the prior art is used to perform IV testing on the back contact battery and calculate the fill factor. The aforementioned back contact battery IV test stage is used to perform IV testing on the back contact battery and calculate the fill factor.

[0067] The fill factor (FF) is the ratio of the output current to the output voltage of a solar cell multiplied by 100%. It represents the degree of matching between the current and voltage of a solar cell. The closer the fill factor is to 1, the better the performance of the cell and the smaller the internal resistance loss.

[0068] The results of the fill factor (FF) test are shown in the table below:

[0069] Existing IV test platform 78.745 81.832 83.035 82.482 82.7635 Test platform for this scheme IV 83.166 83.186 83.230 83.248 83.214

[0070] As shown in the table, when testing back-contact batteries using the existing IV test stage, the fill factor (FF) fluctuates significantly, approaching 5%. When testing back-contact batteries using the proposed IV test stage, the fill factor (FF) fluctuation is much smaller, within 0.1%. The proposed IV test stage for back-contact batteries significantly reduces the fluctuation of the fill factor test results, thus improving test accuracy.

[0071] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A back-contact battery IV test stage, characterized in that, The system includes a platform body (100) for supporting the back contact cell, a probe row platform (7) is provided at the bottom of the platform body (100), a number of probe rows (6) are installed on the upper surface of the probe row platform (7), and a probe hole (5) is provided at the top of the platform body (100) to guide the movement of the probe rows (6).

2. The back-contact battery IV test stage according to claim 1, characterized in that, A lifting drive assembly is provided on the platform body (100). The lifting drive assembly includes a drive motor (1), a transmission mechanism and lifting rods (3). The drive motor (1) is installed on the rear side of the platform body (100). The two lifting rods (3) are slidably arranged on the left and right sides of the platform body (100) and are connected to the probe row platform (7). The transmission mechanism is connected between the drive motor (1) and the lifting rods (3).

3. The back-contact battery IV test stage according to claim 1, characterized in that, The upper surface of the platform body (100) is provided with several negative pressure adsorption holes. The bottom of the negative pressure adsorption holes are connected and connected to the air pipe (9) on one side of the platform body (100). The air pipe (9) is connected to the negative pressure device.

4. The back-contact battery IV test stage according to claim 2, characterized in that, An automatic air control valve (8) is installed on the air pipe (9).

5. The back-contact battery IV test stage according to claim 4, characterized in that, The top of the stage body (100) is provided with four silicon wafer detectors (4), which are arranged around the stage body (100) and adapted to the size of the back contact cell.

6. The back-contact battery IV test stage according to claim 5, characterized in that, The silicon wafer detector (4) is configured as a photoelectric sensor, and emits a sensing signal when the back contact cell edge blocks the silicon wafer detector (4).

7. The back-contact battery IV test stage according to claim 6, characterized in that, A control center (2) is provided on the main body (100) of the stage, and the control center (2) is electrically connected to the drive motor (1), the automatic air control valve (8) and the silicon wafer detector (4).

8. The back-contact battery IV test stage according to claim 7, characterized in that, A control valve switch (10) and a probe row stage switch (11) are provided on the front side of the stage body (100). The control valve switch (10) and the probe row stage switch (11) are electrically connected to the control center (2).

9. A back-contact battery IV test stage according to claim 1, characterized in that, The bottom of the platform body (100) is provided with a lower groove (12) to accommodate the probe row platform (7), and the side of the platform body (100) is provided with a side groove (13) to accommodate the lifting rod (3).

10. A back-contact battery IV test stage according to claim 3, characterized in that, The negative pressure adsorption holes and probe holes (5) are arranged alternately.

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