Utilization method of N-type crystal bar

Abstract

The invention provides an N-type crystal bar utilization method, and relates to the field of photovoltaic technology, and the method comprises the following steps: dividing an N-type crystal bar into an intermediate material and a head-tail high oxygen material, and the intermediate material and the head-tail high oxygen material are cylindrical; wherein the oxygen content of the intermediate material is lower than that of the head-tail high-oxygen material, and the intermediate material is used for producing a TOPCon battery; four-side arc-shaped edge skins of the head and tail oxygen high materials are removed, and the materials are processed into a whole square rod; and the whole square rod is cut according to requirements and then is used for producing the HJT battery. According to the method, the areas with different electrical properties of the N-type crystal bar are classified and utilized by utilizing the difference of the requirements of different battery production processes on the electrical properties of the silicon wafers, so that the utilization rate of the N-type crystal bar is effectively improved, and the remelting cost of head and tail oxygen-rich materials which are originally used as waste materials is reduced.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a method for utilizing N-type crystal rods. Background Technology

[0002] N-type battery technology has developed rapidly due to its high conversion efficiency, becoming the mainstream of the new generation of technology, including TOPCon batteries (tunneling oxide passivation batteries) that use N-type crystal rods as raw materials.

[0003] Currently, the oxygen content in the middle of the pulled N-type crystal rod is lower than that at the head / tail. When used in the TOPCon battery production process, because the TOPCon battery technology has high requirements for the oxygen content of N-type crystal rods, only the middle part of the N-type crystal rod can meet the manufacturing requirements. The high-oxygen crystal rods at the head / tail are recycled as waste. The utilization rate of N-type crystal rods is low and the cost of using them to produce TOPCon batteries is high. Summary of the Invention

[0004] In view of the above situation, the present invention provides a method for utilizing N-type crystal rods, aiming to solve the technical problems of low utilization rate of N-type crystal rods and high cost of using them to produce TOPCon cells, which are currently recycled as waste materials at the beginning / end of the process.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a method for utilizing N-type crystal rods, comprising:

[0007] The N-type crystal rod is divided into intermediate material and head and tail high oxygen material, both of which are cylindrical; wherein, the oxygen content of the intermediate material is lower than that of the head and tail high oxygen material, and it is used to produce TOPCon cells.

[0008] The head and tail high-oxygen material is processed into whole square bars by removing the four-sided arc-shaped edge skin;

[0009] The whole square bar is cut as needed and used to produce HJT batteries.

[0010] In some embodiments of the present invention, the whole square bar is cut as required for the production of HJT batteries, including:

[0011] The whole square bar is cut into half bars at a specific depth angle and along the length direction parallel to the whole square bar using a cutting device;

[0012] Cut the half-bar into multiple halves of a specified thickness along its cross-section;

[0013] The half-cell is used to produce HJT batteries.

[0014] In some embodiments of the present invention, the half-piece is 210 mm long and 105 mm wide.

[0015] In some embodiments of the present invention, the head and tail high oxygen material includes a head high oxygen crystal rod and / or a tail high oxygen crystal rod.

[0016] In some embodiments of the present invention, both the intermediate material and the head and tail oxygen-rich materials are cylindrical.

[0017] The embodiments of the present invention have at least the following advantages or beneficial effects:

[0018] TOPCon cell manufacturing uses a low-temperature diffusion process, which is highly sensitive to oxygen content. Since the HJT cell manufacturing process has lower oxygen content requirements than the TOPCon process, the high-oxygen-content head and tail sections can be used to manufacture HJT cells after squaring and slicing. In other words, this application utilizes the differences in the electrical performance requirements of silicon wafers across different cell manufacturing processes (different oxygen contents lead to different electrical performance) to classify and utilize regions with different electrical properties in N-type crystal rods, effectively improving the utilization rate of N-type crystal rods and reducing the recycling cost of the high-oxygen-content head and tail sections, which would otherwise be considered waste.

[0019] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention.

[0021] This embodiment provides a method for utilizing N-type crystal rods, including the following steps:

[0022] Step S1, Segmentation: The N-type crystal rod is segmented into intermediate material and head-and-tail high-oxygen material. The oxygen content of the intermediate material is lower than that of the head-and-tail high-oxygen material, while still meeting the oxygen content requirements of the TOPCon battery manufacturing process. The intermediate material is used to produce TOPCon batteries. The head-and-tail high-oxygen material includes the head high-oxygen crystal rod and / or the tail high-oxygen crystal rod. Both the intermediate material and the head-and-tail high-oxygen material are cylindrical.

[0023] Step S2, Square Cutting: Remove the four-sided arc-shaped skin from the head and tail oxygen-rich material and process it into a whole square bar.

[0024] Step S3: After cutting the whole square bar as required, it is used to produce HJT cells (heterojunction solar cells), including:

[0025] Step S31: The whole square bar is cut into half bars at a specific depth angle by a cutting device along the length direction parallel to the whole square bar.

[0026] Step S32: Cut the half rod into multiple halves with a specified thickness along the cross-section of the half rod.

[0027] In a specific implementation scenario, the side length of the half piece is: length × width = 210mm × 105mm.

[0028] Step S33: Use the half-cell to produce HJT batteries.

[0029] TOPCon cell manufacturing uses a low-temperature diffusion process, which is highly sensitive to oxygen content. Since the HJT cell manufacturing process has lower oxygen content requirements than the TOPCon process, the high-oxygen-content head and tail sections can be used to manufacture HJT cells after squaring and slicing. In other words, this embodiment utilizes the differences in the electrical performance requirements of silicon wafers across different cell manufacturing processes (different oxygen contents lead to different electrical performance) to classify and utilize regions with different electrical properties in N-type crystal rods, effectively improving the utilization rate of N-type crystal rods and reducing the recycling cost of the high-oxygen-content head and tail sections, which would otherwise be considered waste.

[0030] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for utilizing an N-type crystal rod, characterized in that: include: The N-type crystal rod is divided into an intermediate material and a head-tail oxygen-high material, wherein both the intermediate material and the head-tail oxygen-high material are cylindrical; wherein the oxygen content of the intermediate material is lower than that of the head-tail oxygen-high material, and the intermediate material is used to produce TOPCon batteries; The head and tail high-oxygen materials are processed into whole square bars by removing the four-sided arc-shaped edge skin; The whole square rod is cut as required and then used to produce HJT batteries.

2. The N-type crystal rod utilization method according to claim 1, characterized in that: The whole square rod is cut as required and used to produce HJT batteries, including: Cutting the whole square rod into half rods at a specific depth angle along a length direction parallel to the whole square rod by a cutting device; cutting the half-rod into a plurality of half-slices with a specified thickness along a cross section of the half-rod; The half-sheet is used to produce a HJT cell.

3. The N-type crystal rod utilization method according to claim 2, characterized in that: The half piece has a length of 210 mm and a width of 105 mm.

4. The N-type crystal rod utilization method according to claim 1, characterized in that: The head and tail oxygen high crystal material includes a head oxygen high crystal rod and / or a tail oxygen high crystal rod.

5. The N-type crystal rod utilization method according to claim 1, characterized in that: The intermediate material and the head and tail oxygen high materials are both cylindrical.