Solar cell calibration plate and manufacturing method thereof

Abstract

The application discloses a solar cell calibration board and a manufacturing method thereof. The solar cell calibration board comprises a cell chip, the cell chip is provided with a positive electrode end and a negative electrode end, the positive electrode end and the negative electrode end are respectively provided with a first positive electrode conductive strip and a first negative electrode conductive strip, and the first positive electrode conductive strip and the first negative electrode conductive strip are respectively provided with a first positive electrode extension and a first negative electrode extension; the surface of the cell chip is provided with an encapsulation layer, the surface of the encapsulation layer is provided with a second positive electrode conductive strip and a second negative electrode conductive strip, and the second positive electrode conductive strip and the second negative electrode conductive strip are respectively provided with a second positive electrode extension and a second negative electrode extension. The application combines the test characteristics of the cell chip test equipment and the battery assembly test equipment, and through the structural design of the first positive electrode extension, the first negative electrode extension and the encapsulation layer, the solar cell calibration board can be stably placed in the air for a long time, and the cell chip test equipment can be repeatedly calibrated.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic power generation module technology, specifically relating to a solar cell calibration plate and its manufacturing method. Background Technology

[0002] Cadmium telluride (CdTe) solar cells are produced through numerous processes such as coating and laser scribing to form CdTe solar cells. To determine the key power parameters of these cells, power testing is performed. Since the solar cell surface has no leads, the power is typically measured using rows of probes that directly contact the cell film. Each row of probes consists of 15-20mm copper cylindrical pins. Because the power of the solar cell is affected by factors such as temperature, light intensity, and equipment fluctuations, a standard plate with known power ratings is needed for further calibration to ensure the accuracy of the testing equipment. Company-level primary calibration boards are typically calibrated and verified by qualified organizations. These boards use battery modules that have undergone light decay and other experiments and whose power has stabilized, similar to those produced by the company. The reason for choosing battery modules over battery chips is that calibration boards can be stored for a long time and their power parameters have long-term stability. Battery modules, protected by encapsulation materials such as encapsulation films and backplane glass, meet the requirements for calibration boards. In contrast, cadmium telluride battery chips have a molybdenum coating on their surface, which will oxidize and delaminate if exposed to air for a long time, making them unsuitable for prolonged exposure.

[0003] The existing solution involves connecting a battery chip to a battery module testing device via a wire for testing. After testing, the battery chip is immediately used to calibrate the battery chip testing device. However, since the battery chip cannot be encapsulated, it can only be used for a short period of time. After the molybdenum film layer oxidizes, the electrical performance parameters of the battery module testing device will change, leading to inaccurate electrical performance parameters of the battery chip calibration board. As a result, the battery chip used as the standard board becomes unusable, requiring frequent replacement of the calibration board. Repeatedly replacing the calibration board in a short period of time not only wastes the battery chip but also causes instability in the calibration of the battery chip testing device. Summary of the Invention

[0004] The purpose of this invention is to provide a solar cell calibration plate and its manufacturing method to solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention employs the following technical solution: a solar cell calibration plate, comprising a battery chip, the battery chip having a positive terminal and a negative terminal, the positive terminal and the negative terminal respectively having a first positive conductive strip and a first negative conductive strip, and the first positive conductive strip and the first negative conductive strip respectively having a first positive extension portion and a first negative extension portion extending to the outside of the battery chip; an encapsulation layer is provided on the surface of the battery chip, the first positive extension portion and the first negative extension portion are exposed outside the encapsulation layer, the surface of the encapsulation layer has a second positive conductive strip and a second negative conductive strip, and the second positive conductive strip and the second negative conductive strip respectively have a second positive extension portion and a second negative extension portion extending to the outside of the battery chip, the second positive extension portion being connected to the first positive extension portion, and the second negative extension portion being connected to the first negative extension portion.

[0006] As an optional design structure of the above technical solution, the encapsulation layer includes an encapsulation film layer and a TPT flexible backplane layer, which are sequentially disposed on the surface of the battery chip.

[0007] As an optional design structure of the above technical solution, both the first positive conductive strip and the first negative conductive strip are single-sided conductive tin-plated copper foil conductive tapes.

[0008] As an optional design structure of the above technical solution, the second positive conductive strip and the second negative conductive strip are both tin-plated copper foil conductive tapes that are conductive on one side.

[0009] As an optional design structure of the above technical solution, the adhesive of the tin-plated copper foil conductive tape is conductive acrylic adhesive.

[0010] As an optional design structure of the above technical solution, the edge of the battery chip is provided with an annular insulating edge, and the surface of the battery chip is provided with a number of hot spots. The number of hot spots divides the battery chip into at least two battery cells, and each battery cell is provided with a positive terminal and a negative terminal.

[0011] As an optional design structure for the above technical solution, the battery chip is a cadmium telluride thin-film battery chip.

[0012] On the other hand, the present invention adopts the following technical solution: a method for manufacturing a solar cell calibration plate, comprising the following steps:

[0013] Step A: Select a battery chip, and attach a first positive conductive strip and a first negative conductive strip to the positive and negative terminals of the battery chip, respectively, with the first positive extension of the first positive conductive strip and the first negative extension of the first negative conductive strip extending to the outside of the battery chip.

[0014] Step B: Package the battery chip and expose the first positive electrode extension and the first negative electrode extension outside the packaging layer.

[0015] Step C: Connect the first positive extension part with a positive wire and connect the first negative extension part with a negative wire. The ends of the positive wire and the negative wire are respectively provided with positive terminals and negative terminals.

[0016] Step D: Connect the positive and negative terminals using the calibrated battery assembly testing equipment to obtain the performance parameters of the battery chip;

[0017] Step E: Remove the positive and negative electrode wires, and adhere a second positive conductive strip and a second negative conductive strip to the surface of the encapsulation layer. Extend the second positive electrode extension of the second positive conductive strip to the outside of the battery chip and connect it to the first positive electrode extension. Extend the second negative electrode extension of the second negative electrode conductive strip to the outside of the battery chip and connect it to the first negative electrode extension to obtain a solar cell calibration board. When the solar cell calibration board is placed on the battery chip testing equipment, the second positive electrode conductive strip and the second negative electrode conductive strip directly contact the test probes of the battery chip testing equipment. The performance parameters of the battery chip serve as the standard parameters of the battery chip testing equipment, thereby realizing the calibration function of the battery chip testing equipment.

[0018] As an optional design structure of the above technical solution, both the positive terminal and the negative terminal are MC4 terminals.

[0019] As an optional design structure of the above technical solution, the contact point between the second positive electrode extension and the first positive electrode extension is connected by welding, and the contact point between the second negative electrode extension and the first negative electrode extension is connected by welding.

[0020] As an optional design structure of the above technical solution, the first positive conductive strip, the first negative conductive strip, the second positive conductive strip, and the second negative conductive strip are all single-sided conductive tin-plated copper foil conductive tapes.

[0021] As an optional design structure of the above technical solution, the adhesive of the tin-plated copper foil conductive tape is conductive acrylic adhesive.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention combines the testing features of battery chip testing equipment and battery module testing equipment. Through structural designs such as the first positive electrode extension, the first negative electrode extension, and the encapsulation layer, the solar cell calibration plate can not only be placed stably in the air for a long time, but also be repeatedly used to calibrate the battery chip testing equipment. This solves the problem of the short lifespan of solar cell calibration plates in the air, and eliminates the need to replace the solar cell calibration plate, reducing waste and lowering the cost of use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the arrangement structure of the first positive electrode extension and the second positive electrode extension in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the layout structure of the positive and negative conductors in one embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of a solar cell calibration plate in one embodiment of the present invention.

[0027] In the diagram: 1-Battery chip; 2-First positive conductive strip; 3-First negative conductive strip; 4-First positive extension; 5-First negative extension; 6-Encapsulation layer; 7-Second positive conductive strip; 8-Second negative conductive strip; 9-Second positive extension; 10-Second negative extension; 11-Insulating edge; 12-Hot spot line; 13-Positive wire; 14-Negative wire; 15-Positive terminal; 16-Negative terminal. Detailed Implementation

[0028] Example

[0029] like Figures 1-3 As shown, this embodiment provides a solar cell calibration board, including a battery chip 1. The battery chip 1 is a cadmium telluride thin-film battery chip, which belongs to thin-film solar modules. Currently, considering safety and reducing hot spot effects, cadmium telluride thin-film battery chips have three hot spot lines 12 and an insulating edge 11 around them. The hot spot lines 12 and the insulating edge 11 are all blank glass areas reserved by the coating using laser scanning, and are insulating and non-conductive. The three hot spot lines 12 and the insulating edge 11 divide the entire coated battery chip 1 into four battery units. Each battery unit has many laser-etched lines to form a power generation structure.

[0030] like Figure 1As shown, each battery cell has a positive terminal and a negative terminal. The positive terminal and negative terminal are respectively provided with a first positive conductive strip 2 and a first negative conductive strip 3. The first positive conductive strip 2 is adhered to the positive terminal, and the first negative conductive strip 3 is adhered to the negative terminal. The first positive conductive strip 2 and the first negative conductive strip 3 are respectively provided with a first positive extension 4 and a first negative extension 5 extending to the outside of the battery chip 1. Both the first positive conductive strip 2 and the first negative conductive strip 3 have a certain length. A portion of the first positive conductive strip 2 is adhered to the surface of the battery chip 1, and the other portion of the first positive conductive strip 2 extends to the outside of the battery chip 1 as the first positive extension 4. Similarly, a portion of the first negative conductive strip 3 is adhered to the surface of the battery chip 1, and the other portion of the first negative conductive strip 3 extends to the outside of the battery chip 1 as the first negative extension 5.

[0031] like Figure 2 As shown, the surface of the battery chip 1 is provided with an encapsulation layer 6, which encapsulates a portion of the first positive conductive strip 2 and the first negative conductive strip 3. The first positive extension 4 and the first negative extension 5 are exposed outside the encapsulation layer 6. The first positive extension 4 and the first negative extension 5 are convenient to connect to the positive wire 13 and the negative wire 14, and the performance parameters of the battery chip 1 can be detected by the battery assembly testing equipment.

[0032] like Figure 3 As shown, the surface of the encapsulation layer 6 is provided with a second positive conductive strip 7 and a second negative conductive strip 8, and the second positive conductive strip 7 and the second negative conductive strip 8 are respectively provided with a second positive extension 9 and a second negative extension 10 extending to the outside of the battery chip 1. The second positive extension 9 is connected to the first positive extension 4, and the second negative extension 10 is connected to the first negative extension 5. After the performance parameters of the battery chip 1 are tested using the battery module testing equipment, the positive wire 13 and the negative wire 14 connected to the battery module testing equipment can be disconnected, and the battery chip testing equipment can be calibrated using the performance parameters of the battery chip 1.

[0033] In this embodiment, the encapsulation layer 6 includes an encapsulating film layer and a TPT flexible backplane layer, which are sequentially disposed on the surface of the battery chip 1. The dimensions of the encapsulating film layer and the TPT flexible backplane layer match the dimensions of the battery chip 1. The encapsulating film layer is laid on the surface of the battery chip 1, the TPT flexible backplane layer is laid on the surface of the encapsulating film layer, and the second positive electrode conductive strip 7 and the second negative electrode conductive strip 8 are adhered to the surface of the TPT flexible backplane layer.

[0034] In this design, the first positive conductive strip 2 and the first negative conductive strip 3 are both single-sided conductive tin-plated copper foil conductive tapes, and the second positive conductive strip 7 and the second negative conductive strip 8 are also single-sided conductive tin-plated copper foil conductive tapes. Preferably, the adhesive used for the tin-plated copper foil conductive tapes is conductive acrylic adhesive, which can improve the calibration accuracy of the battery chip testing equipment.

[0035] This invention combines the testing features of battery chip testing equipment and battery module testing equipment. Through the structural design of the first positive electrode extension 4, the first negative electrode extension 5, and the encapsulation layer 6, the solar cell calibration plate can not only be placed stably in the air for a long time, but also be repeatedly used to calibrate the battery chip testing equipment.

[0036] This embodiment also provides a method for manufacturing the above-mentioned solar cell calibration plate, including the following steps:

[0037] Step A, as follows Figure 1 As shown, a battery chip 1 with good appearance and electrical performance is selected. A first positive conductive strip 2 and a first negative conductive strip 3 are respectively attached to the positive and negative terminals of the battery chip 1. The first positive conductive strip 2 has a first positive extension 4, and the first negative conductive strip 3 has a first negative extension 5. Both the first positive extension 4 and the first negative extension 5 of the first positive conductive strip 2 and the first negative extension 5 extend to the outside of the battery chip 1. The first positive extension 4 and the first negative extension 5 serve as reserved portions to facilitate the connection of the positive wire 13 and the negative wire 14. The first positive conductive strip 2 and the first negative conductive strip 3 are both single-sided conductive tin-plated copper foil conductive tapes, and the adhesive used for the tin-plated copper foil conductive tapes is conductive acrylic adhesive.

[0038] Step B, as follows Figure 2 As shown, the battery chip 1 is encapsulated, with the first positive electrode extension 4 and the first negative electrode extension 5 exposed outside the encapsulation layer 6. To prevent the battery chip 1 from being oxidized by air, an encapsulation film layer and a TPT flexible backplane layer of the same size as the entire battery chip 1 are sequentially applied to the surface of the battery chip 1, and then encapsulated in a laminator. A portion of the first positive electrode conductive strip 2 and the first negative electrode conductive strip 3 are encapsulated inside the encapsulation layer 6, while the other portions of the first positive electrode conductive strip 2 and the first negative electrode conductive strip 3, namely the first positive electrode extension 4 and the first negative electrode extension 5, are exposed outside the encapsulation layer 6.

[0039] Step C, as Figure 2As shown, a positive electrode wire 13 is used to connect the first positive electrode extension 4, and a negative electrode wire 14 is used to connect the first negative electrode extension 5. Positive electrode terminals 15 and negative electrode terminals 16 are respectively provided at the ends of the positive electrode wire 13 and the negative electrode wire 14. Preferably, both the positive electrode terminal 15 and the negative electrode terminal 16 are MC4 terminals. MC4 terminals can be matched with the wire ports of the battery pack testing equipment so that the positive and negative electrodes of the battery chip 1 can be connected to the corresponding positive and negative electrodes of the battery pack testing equipment.

[0040] Step D: Connect the positive terminal 15 and the negative terminal 16 using the calibrated battery module testing equipment to obtain the performance parameters of battery chip 1. Before using the battery module testing equipment, it should be calibrated using a battery module as a primary calibration board. After the battery module testing equipment is completed, test the performance parameters of battery chip 1 and record the performance parameters of battery chip 1.

[0041] Step E, as Figure 3 As shown, the positive electrode wire 13 and the negative electrode wire 14 are removed. A second positive electrode conductive strip 7 and a second negative electrode conductive strip 8 are adhered to the surface of the encapsulation layer 6. The second positive electrode extension 9 of the second positive electrode conductive strip 7 extends to the outside of the battery chip 1 and connects with the first positive electrode extension 4. The second negative electrode extension 10 of the second negative electrode conductive strip 8 extends to the outside of the battery chip 1 and connects with the first negative electrode extension 5. Both the second positive electrode conductive strip 7 and the second negative electrode conductive strip 8 are single-sided conductive tin-plated copper foil conductive tapes, and the adhesive of the tin-plated copper foil conductive tapes is conductive acrylic adhesive. The contact points of the second positive electrode extension 9 and the first positive electrode extension 4 are connected by welding, and the contact points of the second negative electrode extension 10 and the first negative electrode extension 5 are connected by welding, thus obtaining a solar cell calibration plate.

[0042] When the solar cell calibration plate is placed on the battery chip testing equipment, the positive and negative test probes of the battery chip testing equipment are pressed down, and the test probes make contact with the second positive conductive strip 7 and the second negative conductive strip 8 on the battery chip 1. This means that the position of the test probes does not need to be adjusted during the calibration of the battery chip testing equipment. The performance parameters of the battery chip 1 serve as the standard parameters of the battery chip testing equipment, thus realizing the calibration function of the battery chip testing equipment.

[0043] This invention combines the testing features of battery chip testing equipment and battery module testing equipment. A first positive electrode extension 4 and a first negative electrode extension 5 are pre-installed on the battery chip 1, and it is connected to the battery module testing equipment via a positive electrode wire 13 and a negative electrode wire 14. This allows for the testing of the performance parameters of the battery chip 1. After testing, the positive electrode wire 13 and the negative electrode wire 14 are disconnected, and a second positive electrode extension 9 is connected to the first positive electrode extension 4, and a second negative electrode extension 10 is connected to the first negative electrode extension 5. The second positive electrode conductive strip 7 and the second negative electrode conductive strip 8 directly contact the test probes of the battery chip testing equipment. The performance parameters of the battery chip 1 serve as the standard parameters for the battery chip testing equipment, enabling the calibration function of the equipment. Furthermore, the battery chip 1 has an encapsulation layer 6, allowing the solar cell calibration plate to be stably placed in the air for a longer period. The same solar cell calibration plate can also be repeatedly used to calibrate the battery chip testing equipment, solving the problem of short lifespan of solar cell calibration plates in the air and eliminating the need to replace them, thus reducing waste and lowering operating costs.

[0044] In the description of this invention, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. They can refer to fixed connections, detachable connections, or integral connections; they can be mechanical or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this invention. Furthermore, the specific features and structures described in the embodiments are included in at least one implementation method. Those skilled in the art can combine features from different implementation methods without contradiction. The scope of protection of this invention is not limited to the specific implementation methods described above. Based on the basic technical concept of this invention, implementation methods that can be conceived by those skilled in the art without creative effort are all within the scope of protection of this invention.

Claims

1. A method for manufacturing a solar cell calibration plate, characterized in that, Includes the following steps: Step A: Select a battery chip (1), attach a first positive electrode conductive strip (2) and a first negative electrode conductive strip (3) to the positive and negative terminals of the battery chip (1) respectively, and the first positive electrode extension (4) of the first positive electrode conductive strip (2) and the first negative electrode extension (5) of the first negative electrode conductive strip (3) both extend to the outside of the battery chip (1). Step B: The battery chip (1) is encapsulated, and the first positive electrode extension (4) and the first negative electrode extension (5) are exposed outside the encapsulation layer (6); Step C, the first positive extension (4) is connected by a positive wire (13), and the first negative extension (5) is connected by a negative wire (14). The positive wire (13) and the negative wire (14) are respectively provided with a positive terminal (15) and a negative terminal (16). Step D: Connect the positive terminal (15) and the negative terminal (16) using the calibrated battery assembly testing equipment to obtain the performance parameters of the battery chip (1); Step E: Remove the positive electrode wire (13) and the negative electrode wire (14), and attach the second positive electrode conductive strip (7) and the second negative electrode conductive strip (8) to the surface of the encapsulation layer (6). Extend the second positive electrode extension (9) of the second positive electrode conductive strip (7) to the outside of the battery chip (1) and connect it with the first positive electrode extension (4). Extend the second negative electrode extension (10) of the second negative electrode conductive strip (8) to the outside of the battery chip (1) and connect it with the first negative electrode extension (5) to obtain the solar cell calibration plate. When the solar cell calibration plate is placed on the battery chip testing equipment, the second positive electrode conductive strip (7) and the second negative electrode conductive strip (8) directly contact the test probes of the battery chip testing equipment. The performance parameters of the battery chip (1) serve as the standard parameters of the battery chip testing equipment, thereby realizing the calibration function of the battery chip testing equipment.

2. The method for manufacturing a solar cell calibration plate according to claim 1, characterized in that, Both the positive terminal (15) and the negative terminal (16) are MC4 terminals.

3. The method for manufacturing a solar cell calibration plate according to claim 1, characterized in that, The contact points of the second positive electrode extension (9) and the first positive electrode extension (4) are connected by welding, and the contact points of the second negative electrode extension (10) and the first negative electrode extension (5) are connected by welding.

4. The method for manufacturing a solar cell calibration plate according to claim 1, characterized in that, The first positive conductive strip (2), the first negative conductive strip (3), the second positive conductive strip (7), and the second negative conductive strip (8) are all single-sided conductive tin-plated copper foil conductive tapes, and the adhesive of the tin-plated copper foil conductive tapes is conductive acrylic glue.

5. A solar cell calibration plate, characterized in that, The solar cell calibration plate, manufactured using the method described in claim 1, comprises a battery chip (1). The battery chip (1) has a positive terminal and a negative terminal. The positive terminal and the negative terminal are respectively provided with a first positive conductive strip (2) and a first negative conductive strip (3). The first positive conductive strip (2) and the first negative conductive strip (3) are respectively provided with a first positive extension (4) and a first negative extension (5) extending to the outside of the battery chip (1). An encapsulation layer (6) is provided on the surface of the battery chip (1). Part (4) and the first negative electrode extension (5) are exposed outside the encapsulation layer (6). The surface of the encapsulation layer (6) is provided with a second positive electrode conductive strip (7) and a second negative electrode conductive strip (8). The second positive electrode conductive strip (7) and the second negative electrode conductive strip (8) are respectively provided with a second positive electrode extension (9) and a second negative electrode extension (10) extending to the outside of the battery chip (1). The second positive electrode extension (9) is connected to the first positive electrode extension (4), and the second negative electrode extension (10) is connected to the first negative electrode extension (5).

6. The solar cell calibration plate according to claim 5, characterized in that, The encapsulation layer (6) includes an encapsulation film layer and a TPT flexible backplane layer, which are sequentially disposed on the surface of the battery chip (1).

7. The solar cell calibration plate according to claim 5, characterized in that, The first positive electrode conductive strip (2) and the first negative electrode conductive strip (3) are both single-sided conductive tin-plated copper foil conductive tapes; the second positive electrode conductive strip (7) and the second negative electrode conductive strip (8) are both single-sided conductive tin-plated copper foil conductive tapes.

8. The solar cell calibration plate according to claim 7, characterized in that, The adhesive used for the tin-plated copper foil conductive tape is conductive acrylic adhesive.

9. The solar cell calibration plate according to claim 5, characterized in that, The edge of the battery chip (1) is provided with an annular insulating edge (11), and the surface of the battery chip (1) is provided with a number of hot spots (12). The number of hot spots (12) divides the battery chip (1) into at least two battery cells, and each battery cell is provided with a positive terminal and a negative terminal.

10. The solar cell calibration plate according to claim 5, characterized in that, The battery chip (1) is a cadmium telluride thin-film battery chip (1).

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