A high-efficiency back-contact solar cell module and its preparation process

Abstract

The invention discloses a high-efficiency back-contact solar cell assembly, comprising a back-contact cell sheet, an epoxy resin plate, a cell sheet positioning groove, a conductive through groove, a metal foil circuit layer, and an electrode contact ring. The invention enables the cell assembly to position, arrange, and bond the back-contact solar cell sheet, and the bonding structure is uniform and stable, with high production efficiency, which is conducive to improving the efficiency and quality of the cell assembly.

Description

[Technical field]

[0001] The invention relates to the technical field of solar cells, in particular to the technical field of a high-efficiency back-contact solar cell assembly and a preparation process thereof. [Background technology]

[0002] With the rapid development of the photovoltaic industry, high-efficiency solar cell modules have received more and more attention. Among them, back-contact solar cells and modules are a typical representative of high-efficiency photovoltaic products. Because there is no metal grid line or metal main grid line on the front, it effectively eliminates or reduces the front shading of the metal grid line, improves the utilization rate of incident light, and thus achieves the purpose of improving the photoelectric conversion efficiency of the product. Since the positive and negative electrodes of back-contact solar cells are both on the back, when making back-contact battery modules, the use of traditional solder ribbon welding to connect the cells is easy to cause solder to drip onto the grid line, resulting in a short circuit of the grid line and damage to the solar cell. At the same time, there is no positioning structure, which causes the cells to be scattered during the welding process, uneven welding, and even misaligned welding, which seriously affects the quality stability of the battery module. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to propose a high-efficiency back-contact solar cell module and its preparation process, which can enable the battery module to position, arrange and bond the back-contact solar cell sheet. The bonding structure is uniform and stable, the production efficiency is high, and it is beneficial to improve the efficiency and quality of the battery module.

[0004] To achieve the above-mentioned purpose, the present invention proposes a high-efficiency back-contact solar cell module, including a back-contact cell, an epoxy resin board, a cell positioning groove, a conductive through groove, a metal foil circuit layer, and an electrode contact ring, wherein a plurality of positive and negative electrodes are arranged on the back side of the back-contact cell, an epoxy resin board is arranged at the bottom of the back-contact cell, a plurality of cell positioning grooves are arranged on the top of the epoxy resin board, the back-contact cell is installed in a positioning cell groove, a conductive through groove is arranged at the bottom of the positioning cell groove corresponding to the position of the positive and negative electrodes, a metal foil circuit layer is buried in the epoxy resin board, an electrode contact ring is arranged at the position of the conductive through groove, and the electrode contact ring is bonded to the positive and negative electrodes by a conductive adhesive.

[0005] Preferably, the bottom surface of the back contact battery cell is coated with an insulating film layer, the insulating film layer is provided with conductive through holes at corresponding positions of the positive and negative electrodes, and the positive and negative electrodes pass through the conductive through holes.

[0006] Preferably, the depth of the positioning battery slot is less than the depth of the back contact battery sheet, the top of the conductive through slot protrudes from the bottom of the positioning battery slot, and a plurality of transfer elastic pressing sheets are evenly arranged on the top of the edge of the positioning battery slot.

[0007] Preferably, the conductive through groove is a tapered through groove with a gradually enlarged bottom end, the positive and negative electrodes penetrate into the conductive through groove, and the bottom of the conductive through groove is evenly filled with silicone sealant.

[0008] The present invention proposes a preparation process of a high-efficiency back-contact solar cell module, which comprises the following steps in sequence:

[0009] Step 1: Prepare a metal foil circuit layer, and set a thickened electrode contact ring on the metal foil circuit layer according to the position of the positive and negative electrodes of the back contact battery cell;

[0010] Step 2: Place the metal foil circuit layer prepared in step 1 into a mold to prepare an epoxy resin board;

[0011] Step 3: Install the back contact battery cell in the positioning battery slot of the epoxy resin board prepared in step 2, align the positive and negative electrodes with the conductive through slots, and use the transfer elastic pressing sheet to limit and fix the back contact battery cell;

[0012] Step 4: Use laser mirror scanning to detect the docking position of the positive and negative electrodes and the conductive through slots after the processing in step 3, and sort and correct the wrong and missing parts;

[0013] Step 5: Bond the positive and negative electrodes that have passed the test in step 4 to the conductive through slots by high-voltage perfusion conductive adhesive;

[0014] Step 6: Evenly fill the bottom of the conductive groove with silicone sealant to seal it, and complete the preparation of the battery assembly.

[0015] Beneficial effects of the present invention: The present invention combines back-contact battery cells, epoxy resin plates, battery cell positioning grooves, conductive through grooves, metal foil circuit layers, and electrode contact rings together, and after experimental optimization, can position, arrange, and bond the battery assembly to the back-contact solar cell cells. The bonding structure is uniform and stable, and the production efficiency is high, which is beneficial to improving the efficiency and quality of the battery assembly.

[0016] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a high-efficiency back-contact solar cell module of the present invention.

[0018] In the figure: 1-back contact battery cell, 2-epoxy resin plate, 3-battery cell positioning groove, 4-conductive through groove, 5-metal foil circuit layer, 6-electrode contact ring, 7-insulating film layer, 8-transposition elastic pressing sheet. [Specific implementation method]

[0019] See also Figure 1The present invention discloses a high-efficiency back-contact solar cell assembly, comprising a back-contact cell 1, an epoxy resin board 2, a cell positioning groove 3, a conductive through groove 4, a metal foil circuit layer 5, and an electrode contact ring 6. The back of the back-contact cell 1 is provided with a plurality of positive and negative electrodes. The bottom of the back-contact cell 1 is provided with an epoxy resin board 2, and the top of the epoxy resin board 2 is provided with a plurality of cell positioning grooves 3. The back-contact cell 1 is installed in a positioning cell groove, and the bottom of the positioning cell groove is provided with a conductive through groove 4 corresponding to the position of the positive and negative electrodes. The epoxy resin board 2 is embedded with a metal foil circuit layer 5, and the metal foil circuit layer 5 is located at the conductive through groove 4. An electrode contact ring 6 is provided, and the electrode contact ring 6 is bonded to the positive and negative electrodes by a conductive adhesive. The bottom surface of the back contact battery cell 1 is covered with an insulating film layer 7, and the insulating film layer 7 is provided with conductive through holes at the corresponding positions of the positive and negative electrodes, and the positive and negative electrodes pass through the conductive through holes. The depth of the positioning battery slot is less than the depth of the back contact battery cell 1, and the top of the conductive through slot 4 protrudes from the bottom of the positioning battery slot. A number of transfer elastic pressing sheets 8 are evenly arranged on the top of the edge of the positioning battery slot. The conductive through slot 4 is a conical through slot with a gradually enlarged bottom, and the positive and negative electrodes pass through the conductive through slot 4, and the bottom of the conductive through slot 4 is evenly filled with silicone sealant.

[0020] The present invention proposes a preparation process of a high-efficiency back-contact solar cell module, which comprises the following steps in sequence:

[0021] Step 1: prepare a metal foil circuit layer 5, and arrange a thickened electrode contact ring 6 on the metal foil circuit layer 5 according to the positions of the positive and negative electrodes of the back contact battery cell 1;

[0022] Step 2: Place the metal foil circuit layer 5 prepared in step 1 into a mold to prepare an epoxy resin board 2;

[0023] Step 3: Install the back contact battery sheet 1 in the positioning battery slot of the epoxy resin board 2 prepared in step 2, align the positive and negative electrodes with the conductive through slots 4, and use the transfer elastic pressing sheet 8 to limit and fix the back contact battery sheet 1;

[0024] Step 4: Use laser mirror scanning to detect the docking position of the positive and negative electrodes and the conductive through slot 4 after the processing in step 3, and sort and correct the wrong and missing parts;

[0025] Step 5: Perform high-voltage perfusion of conductive adhesive to bond the positive and negative electrodes that have passed the test in step 4 to the conductive through slots 4;

[0026] Step 6: Evenly fill the bottom of the conductive groove 4 with silicone sealant to seal it, and complete the preparation of the battery assembly.

[0027] The present invention combines a back-contact cell 1, an epoxy resin board 2, a cell positioning groove 3, a conductive through groove 4, a metal foil circuit layer 5, and an electrode contact ring 6 together, and after experimental optimization, the battery assembly can be positioned, arranged, and bonded to the back-contact solar cell. The bonding structure is uniform and stable, the production efficiency is high, and it is beneficial to improve the efficiency and quality of the battery assembly.

[0028] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A high-efficiency back-contact solar cell module, characterized in that: The invention comprises a back contact battery cell (1), an epoxy resin plate (2), a battery cell positioning groove (3), a conductive groove (4), a metal foil circuit layer (5), and an electrode contact ring (6), wherein a plurality of positive and negative electrodes are arranged on the back of the back contact battery cell (1), an epoxy resin plate (2) is arranged at the bottom of the back contact battery cell (1), a plurality of battery cell positioning grooves (3) are arranged at the top of the epoxy resin plate (2), the back contact battery cell (1) is installed in the battery cell positioning groove (3), a conductive groove (4) is arranged at the bottom of the battery cell positioning groove (3) corresponding to the position of the positive and negative electrodes, a metal foil circuit layer (5) is buried in the epoxy resin plate (2), and the metal foil circuit layer (5) is provided with an electrode contact ring at the position of the conductive groove (4). (6), the electrode contact ring (6) is bonded to the positive and negative electrodes by a conductive adhesive, the bottom surface of the back contact battery cell (1) is coated with an insulating adhesive film layer (7), the insulating adhesive film layer (7) is provided with conductive through holes at corresponding positions of the positive and negative electrodes, the positive and negative electrodes pass through the conductive through holes, the depth of the battery cell positioning groove (3) is less than the depth of the back contact battery cell (1), the top of the conductive through groove (4) protrudes from the bottom of the battery cell positioning groove (3), a plurality of transfer elastic pressing sheets (8) are evenly arranged on the top of the edge of the battery cell positioning groove (3), the conductive through groove (4) is a tapered through groove with a gradually enlarged bottom, the positive and negative electrodes pass through the conductive through groove (4), and the bottom of the conductive through groove (4) is evenly filled with silicone sealant.

2. A process for preparing a high-efficiency back-contact solar cell module, characterized in that: A preparation process of a high-efficiency back-contact solar cell module comprises the following steps in sequence: Step 1: preparing a metal foil circuit layer (5), and providing a thickened electrode contact ring (6) on the metal foil circuit layer (5) according to the positions of the positive and negative electrodes of the back contact battery sheet (1); Step 2: placing the metal foil circuit layer (5) prepared in step 1 into a mold to prepare an epoxy resin board (2); Step 3: Install the back contact battery cell (1) in the battery cell positioning groove (3) of the epoxy resin plate (2) prepared in step 2, align the positive and negative electrodes with the conductive through groove (4), and use the transfer elastic pressing sheet (8) to limit and fix the back contact battery cell (1); Step 4: Use laser mirror scanning to detect the docking position of the positive and negative electrodes and the conductive grooves (4) after the processing in step 3, and sort and correct the wrong and missing parts; Step 5: bonding the positive and negative electrodes that have passed the test in step 4 to the conductive through slots (4) by high-voltage perfusion of conductive adhesive; Step 6: Evenly fill the bottom of the conductive groove (4) with silicone sealant to seal it, and complete the preparation of the battery assembly.

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