Back contact battery piece detection device

Abstract

The utility model belongs to the technical field of photovoltaic cells, and particularly discloses a back contact cell detection device, which comprises a light source, an EL test camera, a hollow support, a transparent glass plate, a flexible circuit board and a bottom buffer part, and the bottom buffer part, the flexible circuit board, a back contact cell, the transparent glass plate and the hollow support are sequentially laminated from bottom to top. The hollow support is made to abut against the transparent glass plate, the transparent glass plate extrudes the back contact battery piece and the flexible circuit board on the bottom buffering piece, and the hollow support is arranged in a hollow mode. According to the utility model, the problems of poor contact and easy wear of the traditional PCB can be solved, and the replacement cost of the circuit board is saved; stable and reliable electrical contact can be formed between the back contact battery piece and the flexible circuit board, and the stability of the back contact battery piece test is improved; meanwhile, the hollow support is used for replacing a traditional probe row to apply pressure, and the light source and the camera cannot be shielded.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic cells, and particularly relates to a back-contact cell detection device. Background Art

[0002] A back-contact cell is a type of solar cell in which both electrodes are disposed on the back of the cell and form an interdigitated structure. Currently, the IV curve test and EL test of the back-contact cell are realized by a detection device as shown in Figure 1 . The probe row is used to press downward against the glass plate, and the back-contact cell is clamped by the glass plate and the PCB board, so that the interdigitated electrodes on the back of the back-contact cell are docked with the probes on the PCB board. During the test, the back-contact cell is irradiated by a light source to generate current and voltage, and the current and voltage are led out through the PCB board to an IV curve tester for an IV curve test. After the IV curve test is completed, an external power supply is transmitted to the back-contact cell through the PCB board to make the back-contact cell emit light, and then the back-contact cell is photographed by a camera for viewing to complete the EL test. However, this detection device has the following deficiencies: the PCB board is in hard contact with the back-contact cell, which is easy to wear, resulting in poor contact, inaccurate testing, and large result fluctuations; and the PCB board wears out quickly and needs to be replaced continuously, increasing the cost; at the same time, due to the need for a probe row to apply pressure on the front, part of the light source will be blocked, and part of the shooting path of the EL test camera will also be blocked. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a back-contact cell detection device to solve the above problems existing in the prior art.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a back-contact cell detection device, which includes a light source, an EL test camera, a hollow bracket, a transparent glass plate, a flexible circuit board, and a bottom buffer. The transparent glass plate and the flexible circuit board are used to clamp the back-contact cell in the middle, so that the front of the back-contact cell abuts against the transparent glass plate, and the electrodes on the back of the back-contact cell are electrically connected to the contacts of the flexible circuit board. The flexible circuit board is electrically connected to an external IV curve tester. The bottom buffer, the flexible circuit board, the back-contact cell, the transparent glass plate, and the hollow bracket are stacked in sequence from bottom to top, so that the hollow bracket abuts against the transparent glass plate, and the transparent glass plate presses the back-contact cell and the flexible circuit board on the bottom buffer. The hollow bracket is hollowly arranged, so that the light source and the EL test camera face the back-contact cell under the transparent glass plate through the hollow part.

[0006] When it is used, the transparent glass plate can be pressed downward by the hollow bracket, so that the transparent glass plate squeezes the back contact battery and the flexible circuit board onto the bottom buffer. Through the buffering effect of the flexible circuit board and the bottom buffer, the electrodes on the back of the back contact battery can be in soft contact with the contacts of the flexible circuit board to form a reliable electrical connection. When it is necessary to test the back contact battery, the light source can be turned on to allow the light to pass through the hollow part of the hollow bracket without obstruction and irradiate the back contact battery through the transparent glass plate. The voltage and current generated by the back contact battery are transmitted to the flexible circuit board through the electrodes on the back, and then output by the flexible circuit board to the external IV curve tester to complete the IV curve test of the back contact battery through the external IV curve tester. After the IV curve test is completed, the flexible circuit board can be connected to an external power supply to inject current into the back contact battery to make the back contact battery emit light. At this time, the back contact battery can be photographed directly without obstruction by the EL test camera to check whether the back contact battery has hidden cracks or other defects.

[0007] In a possible design, the light source and the EL test camera are detachably connected, which facilitates the synchronous assembly and use of the light source and the EL test camera when used.

[0008] In a possible design, the light source is an LED fill light or a xenon lamp. When used, the LED fill light or the xenon lamp can emit strong light, so that the back contact battery sheet can generate electricity efficiently.

[0009] In a possible design, the side of the hollow bracket is provided with a plurality of protrusions. When it is used, the protrusions on the side of the hollow bracket can be used as a fulcrum to apply pressure to the hollow bracket to complete the detection of the back contact battery sheet. In addition, the protrusions are provided on the side of the hollow bracket and will not block the light source and the EL test camera, which is conducive to the detection of the back contact battery sheet.

[0010] In a possible design, a spring is provided on the protrusion. When used, the spring can apply linear pressure to the hollow support through the buffering effect of the spring, so that the transparent glass plate and the back contact battery sheet can be in contact more gently and stably.

[0011] In a possible design, the bottom buffer is an air bag. When used, the air bag can effectively buffer the flexible circuit board and the back contact battery sheet.

[0012] In a possible design, the bottom buffer is a soft rubber pad. When used, the soft rubber pad can effectively buffer the flexible circuit board and the back contact battery sheet.

[0013] In a possible design, a groove for accommodating a back-contact solar cell and a flexible circuit board is provided on the bottom buffer, and the transparent glass plate presses and caps the back-contact solar cell and the flexible circuit board in the groove of the bottom buffer. During application, the back-contact solar cell and the flexible circuit board can be capped and limited in the groove of the bottom buffer by the transparent glass plate for stable testing, improving the reliability of the contact between the back-contact solar cell and the flexible circuit board.

[0014] Beneficial effects: The utility model uses a flexible circuit board to replace the traditional PCB board, which can solve the problems of poor contact and easy wear of the PCB board, saving the cost of replacing the circuit board; and through the corresponding buffer design, a stable and reliable electrical contact can be formed between the back-contact solar cell and the flexible circuit board, improving the stability of the back-contact solar cell test; at the same time, using a hollow bracket to replace the traditional probe row for pressing will not block the light source and the camera. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of an existing back-contact solar cell detection device;

[0017] Figure 2 It is a schematic structural diagram of the back-contact solar cell detection device provided by the embodiment;

[0018] Figure 3 It is a schematic use diagram of the back-contact solar cell detection device provided by the embodiment.

[0019] In the figure: 1. Light source; 2. EL test camera; 3. Hollow bracket; 31. Protrusion; 32. Spring; 4. Transparent glass plate; 5. Flexible circuit board; 6. Bottom buffer; 7. Back-contact solar cell. Detailed Embodiments

[0020] It should be noted here that the description of these embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model. The specific structural and functional details disclosed herein are only used to describe the exemplary embodiments of the present utility model. However, the present utility model can be embodied in many alternative forms and should not be construed as limited to the embodiments set forth herein.

[0021] It should be understood that, unless otherwise clearly specified and defined, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments can be understood according to specific situations.

[0022] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those of ordinary skill in the art should understand that the exemplary embodiments can be implemented without these specific details. For example, the system can be shown in a block diagram to avoid obscuring the example with unnecessary details. In other embodiments, well-known processes, structures, and technologies can be shown without unnecessary details to avoid obscuring the embodiments.

[0023] Embodiment:

[0024] This embodiment provides a back-contact cell detection device, as Figures 2 to 3 shown, including a light source 1, an EL test camera 2, a hollow bracket 3, a transparent glass plate 4, a flexible circuit board 5, and a bottom buffer 6. The transparent glass plate 4 and the flexible circuit board 5 are used to clamp the back-contact cell 7 in the middle, so that the front side of the back-contact cell 7 abuts against the transparent glass plate 4, and the electrodes on the back side of the back-contact cell 7 are electrically connected to the contacts of the flexible circuit board 5. The flexible circuit board 5 is electrically connected to an external IV curve tester. The bottom buffer 6, the flexible circuit board 5, the back-contact cell 7, the transparent glass plate 4, and the hollow bracket 3 are stacked in sequence from bottom to top, so that the hollow bracket 3 abuts against the transparent glass plate 4, and the transparent glass plate 4 presses the back-contact cell 7 and the flexible circuit board 5 onto the bottom buffer 6. The hollow bracket 3 is hollow, so that the light source 1 and the EL test camera 2 face the back-contact cell 7 under the transparent glass plate 4 through the hollow part.

[0025] Furthermore, the light source 1 and the EL test camera 2 are detachably connected to facilitate the synchronous assembly and use of the light source 1 and the EL test camera 2. The light source 1 can adopt an LED fill light or a xenon lamp, and a strong light can be emitted through the LED fill light or the xenon lamp to enable the back-contact cell 7 to generate electricity efficiently.

[0026] Further, a plurality of protruding portions 31 are provided on the side surface of the hollow bracket 3. During use, the protruding portions 31 on the side surface of the hollow bracket 3 can be used as force application points to apply pressure to the hollow bracket 3 to complete the detection of the back-contact cell 7. Moreover, since the protruding portions 31 are provided on the side surface of the hollow bracket 3, they will not block the light source 1 and the EL test camera 2, which is beneficial to the detection of the back-contact cell 7. A spring 32 is provided on the protruding portion 31, and linear pressure can be applied to the hollow bracket 3 through the buffering action of the spring 32, so that the transparent glass plate 4 contacts the back-contact cell 7 more gently and stably.

[0027] Further, the bottom buffer 6 can be an airbag or a soft rubber pad, and the flexible circuit board 5 and the back-contact cell 7 can be effectively buffered through the airbag or the soft rubber pad.

[0028] Further, a groove for accommodating the back-contact cell 7 and the flexible circuit board 5 is provided on the bottom buffer 6, and the transparent glass plate 4 squeezes and covers the back-contact cell 7 and the flexible circuit board 5 in the groove of the bottom buffer 6. During use, the back-contact cell 7 and the flexible circuit board 5 can be covered and limited in the groove of the bottom buffer 6 by the transparent glass plate 4 for stable testing, improving the reliability of the contact between the back-contact cell 7 and the flexible circuit board 5.

[0029] During specific implementation, the hollow bracket 3 can be abutted against the transparent glass plate 4 to apply downward pressure, so that the transparent glass plate 4 squeezes the back-contact cell 7 and the flexible circuit board 5 onto the bottom buffer 6. Through the buffering actions of the flexible circuit board 5 and the bottom buffer 6, the electrodes on the back of the back-contact cell 7 can be in soft contact with the contacts of the flexible circuit board 5 to form a reliable electrical connection. When it is necessary to detect the back-contact cell, the light source 1 can be turned on, so that the light passes through the hollow part of the hollow bracket 3 without obstruction and irradiates the back-contact cell 7 through the transparent glass plate 4. The voltage and current generated by the back-contact cell 7 are transmitted to the flexible circuit board 5 through the electrodes on the back, and then output from the flexible circuit board 5 to an external IV curve tester to complete the IV curve test of the back-contact cell 7 through the external IV curve tester. After the IV curve test is completed, the flexible circuit board 5 can be connected to an external power supply to inject current into the back-contact cell 7 to make the back-contact cell 7 emit light. At this time, the EL test camera 2 can directly face the back-contact cell 7 without obstruction for shooting to check whether there are hidden cracks or other defects in the back-contact cell 7.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A back-contact cell detection device, characterized in that, It includes a light source (1), an EL test camera (2), a hollow bracket (3), a transparent glass plate (4), a flexible circuit board (5), and a bottom buffer (6). The transparent glass plate (4) and the flexible circuit board (5) are used to clamp the back-contact cell (7) in the middle, making the front side of the back-contact cell (7) abut against the transparent glass plate (4), and making the electrodes on the back side of the back-contact cell (7) electrically connected to the contacts of the flexible circuit board (5). The flexible circuit board (5) is electrically connected to an external IV curve tester. The bottom buffer (6), the flexible circuit board (5), the back-contact cell (7), the transparent glass plate (4), and the hollow bracket (3) are stacked in sequence from bottom to top, making the hollow bracket (3) abut against the transparent glass plate (4), and making the transparent glass plate (4) squeeze the back-contact cell (7) and the flexible circuit board (5) on the bottom buffer (6). The hollow bracket (3) is hollowly arranged, so that the light source (1) and the EL test camera (2) are directly opposite to the back-contact cell (7) under the transparent glass plate (4) through the hollow part.

2. The back-contact cell detection device according to claim 1, characterized in that, The light source (1) and the EL test camera (2) are detachably connected.

3. The back-contact cell detection device according to claim 1, wherein, The light source (1) uses an LED fill light or a xenon lamp.

4. The back contact cell detection device according to claim 1, characterized in that Several protruding parts (31) are provided on the side of the hollow bracket (3).

5. The back contact cell detection device according to claim 4, characterized in that, Springs (32) are provided on the protruding parts (31).

6. The back contact cell detection device according to claim 1, wherein, The bottom buffer (6) uses an airbag bag.

7. The back-contact cell detection device according to claim 1, wherein The bottom buffer (6) uses a soft rubber pad.

8. The back-contact cell detection device according to claim 6 or 7, characterized in that, A groove for accommodating the back-contact cell (7) and the flexible circuit board (5) is provided on the bottom buffer (6), and the transparent glass plate (4) squeezes and covers the back-contact cell (7) and the flexible circuit board (5) in the groove of the bottom buffer (6).

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