阅读说明：本技术 一种四倒角小片电池的制备方法 (Preparation method of four-chamfer small battery ) 是由 方敏 常振宇 孟祥熙 任常瑞 许佳平 黄计军 于 2019-11-19 设计创作，主要内容包括：本发明公开了一种四倒角小片电池的制备方法,包括如下步骤：1)将可制备电池整片的硅材切割出用于制备小片电池的长方体状硅块；该硅块包括一对相背设置的端面；2)沿与端面相平行的方向对硅块进行切片,得到矩形硅片；3)使硅片的四个角形成倒角,得到四角为倒角的矩形硅片；4)将硅片制成电池片,即得四倒角小片电池。本发明能制备出四个角都是倒角的矩形小片电池。(The invention discloses a preparation method of a four-chamfer small cell, which comprises the following steps: 1) cutting a silicon material capable of preparing a whole battery into a cuboid-shaped silicon block for preparing a small battery; the silicon block comprises a pair of end surfaces which are arranged oppositely; 2) slicing the silicon block along the direction parallel to the end face to obtain a rectangular silicon wafer; 3) forming chamfers at four corners of the silicon wafer to obtain a rectangular silicon wafer with the four chamfers; 4) and preparing the silicon wafer into a battery piece to obtain the four-chamfer small battery. The invention can prepare rectangular small batteries with four chamfered corners.)

1. A preparation method of a four-chamfer small battery is characterized by comprising the following steps:

1) cutting a silicon material capable of preparing a whole battery into a cuboid-shaped silicon block for preparing a small battery; the silicon block comprises a pair of end surfaces which are arranged oppositely;

2) slicing the silicon block along the direction parallel to the end face to obtain a rectangular silicon wafer;

3) forming chamfers at four corners of the silicon wafer to obtain a rectangular silicon wafer with the four chamfers;

4) and preparing the silicon wafer into a battery piece to obtain the four-chamfer small battery.

2. The method of manufacturing a four-chamfered tab cell according to claim 1, wherein in step 2), the four corners of the silicon wafer are chamfered by grinding the four corners of the silicon wafer.

3. The method of manufacturing a four-chamfered die battery according to claim 1, wherein the chamfering of the silicon wafer in step 3) comprises: the two ends of the chamfer edge are respectively connected with a pair of adjacent side lines of the rectangular silicon wafer; the pair of adjacent sidelines are mutually vertical; the chamfer edge is a straight line.

4. The method for manufacturing a four-chamfered tab battery according to claim 3, wherein the included angle between the chamfered edge and one of the pair of adjacent edge lines is 100 to 170 degrees.

5. The method for manufacturing a four-chamfered tab battery according to claim 3, wherein the length of the chamfered edge is 0.5 to 3 mm.

6. The method of manufacturing a four-chamfered die battery according to claim 1, wherein the chamfering of the silicon wafer in step 3) comprises: the two ends of the chamfer edge are respectively connected with a pair of adjacent side lines of the rectangular silicon wafer; the pair of adjacent sidelines are mutually vertical; the chamfer edge is an arc line.

7. The method of making a four fillet die battery as in claim 6, wherein said arc is a circular arc.

8. The method for manufacturing a four-chamfered tab battery as defined in claim 1, wherein the radius of the circular arc line is 0.5 to 3 mm.

9. The method of manufacturing a four-fillet small-chip battery as claimed in any of claims 6 to 8, wherein the arc has a length of 0.5 to 3 mm.

Technical Field

The invention relates to the field of photovoltaics, in particular to a preparation method of a four-chamfer small cell.

Background

With the development of solar cell technology, small cells have appeared, and the conventional small cells are generally formed by cutting a prepared whole cell, for example, a whole cell (square or quasi-square) is cut into two or more rectangular small cells in equal parts, because the cutting is performed along a straight line trajectory, four corners of the conventional small cell are always right-angled, only the whole quasi-square cell (four corners are chamfered) is cut into two small cells in equal parts, the obtained small cell has two chamfers, and the other two corners of the small cell are also right-angled.

The right angle of the small cell is prone to the following problems:

1) in the process of transferring the small batteries, the friction force is large when the right angles of the small batteries and the transferring structures such as a middle clamping device of the equipment are scratched, so that the small batteries are not transferred in place;

2) the right angle of the small cell increases the probability of subfissure and fragmentation of the small cell.

The above problems are avoided or mitigated if the four corners of the small cell can be chamfered, and it is desirable to devise a method of making a four chamfered small cell.

Disclosure of Invention

The invention aims to provide a method for preparing a four-chamfer small battery, which can prepare a rectangular small battery with four chamfers.

In order to achieve the purpose, the invention provides a preparation method of a four-chamfer small cell, which comprises the following steps:

1) cutting a silicon material capable of preparing a whole battery into a cuboid-shaped silicon block for preparing a small battery; the silicon block comprises a pair of end surfaces which are arranged oppositely;

2) slicing the silicon block along the direction parallel to the end face to obtain a rectangular silicon wafer;

3) forming chamfers at four corners of the silicon wafer to obtain a rectangular silicon wafer with the four chamfers;

4) and preparing the silicon wafer into a battery piece to obtain the four-chamfer small battery.

Preferably, in the step 2), four corners of the silicon wafer are chamfered by polishing the four corners of the silicon wafer.

The invention has the advantages and beneficial effects that: a method for manufacturing a four-chamfered small cell is provided, which can manufacture a rectangular small cell having four chamfered corners.

Detailed Description

The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.