Novel graphite boat frame

Abstract

The utility model relates to the field of solar cell production. A novel graphite boat frame comprises a graphite boat frame smooth structure section 41, a graphite boat frame gradient structure section 42 and a graphite boat rectangular structure section 43 which are connected in sequence, the graphite boat frame smooth structure section 41 is a semicircular plate, the graphite boat frame gradient structure section 42 is an isosceles trapezoid plate, and the graphite boat rectangular structure section 43 is a rectangular plate. And a graphite boat clamping point 3 is arranged on the graphite boat rectangular structure section 43.

Description

TECHNICAL FIELD

[0001] The utility model discloses a solar cell production field. BACKGROUND

[0002] In the manufacture of crystalline silicon solar cells, the plating process of the front and back surfaces uses plasma enhanced chemical vapor deposition (PECVD) technology. In PECVD technology, the graphite boat of the silicon wafer carrying device needs to be powered, and the deposition of the medium film on the surface of the silicon wafer is realized by loading voltage on adjacent boat pieces. In the design of the lower graphite boat piece, the boat piece is a graphite piece with a hollow center and a uniform thickness at the edge, and the cell piece will inevitably be scratched by the graphite boat frame when the cell piece is inserted into the graphite boat piece, forming a boat frame EL defect. UTILITY MODEL CONTENTS

[0003] The utility model discloses a solar cell production field.

[0004] The utility model employs the technical scheme that a novel graphite boat frame, including sequentially connected graphite boat frame smooth structure section 41, graphite boat frame gradient structure section 42, graphite boat rectangular structure section 43, graphite boat frame smooth structure section 41 is a half circle board, graphite boat frame gradient structure section 42 is a trapezoidal board, graphite boat rectangular structure section 43 is a rectangular board, graphite boat rectangular structure section 43 has graphite boat clamping point 3 on it.

[0005] The length of the graphite boat rectangular structure section 43 is 1.5-3cm, and when the silicon wafer is loaded on the graphite boat, the length of the contact part between the silicon wafer and the graphite boat rectangular structure section 43 is 1-2.5cm.

[0006] The waist length of the graphite boat frame gradient structure section 42 is 3-5cm, and when the silicon wafer is loaded on the graphite boat, the included angle e between the silicon wafer and the graphite boat frame gradient structure section 42 is 1-20 °.

[0007] The radius of the graphite boat frame smooth structure section 41 is 0.2-0.5cm.

[0008] The utility model has the advantages that the graphite boat frame is designed as a smooth gradient structure, which effectively reduces the contact area between the cell piece and the graphite boat frame under the condition that the electric field intensity between the graphite boat frames remains unchanged.

[0009] Compared to traditional graphite boat designs, this design does not affect the uniformity of the electric field distribution between the two graphite boats. Instead, the rounded edges at the intersection of the gradient and horizontal structures of the graphite boats, combined with the smoothed structure of the graphite boats, improve the uniformity of charge distribution across the boats. The smoothed structure eliminates areas of high curvature, improving the uniformity of charge distribution across the boat surface. The gradient structure reduces friction between the graphite boat and the silicon wafer, minimizing EL defects such as scratches and frame marks. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the utility model;

[0011] Figure 2 It is a schematic diagram of the graphite boat frame structure of the prior art;

[0012] Among them, 1-battery cell, 2-traditional graphite boat frame, 3-graphite boat card point, 4-new graphite boat frame, 41-graphite boat frame smooth structure segment, 42-graphite boat frame gradient structure segment, 43-graphite boat rectangular structure segment, a-one end point of the graphite boat frame gradient structure segment, b-the other end point b of the graphite boat frame gradient structure segment, c-graphite boat card point end point, d-one end point d of the graphite boat frame rectangular structure segment, e-the angle between the silicon wafer and the graphite boat frame gradient structure segment. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solutions and advantages of this patent more clear, this patent is further described in detail below in conjunction with the embodiments.

[0014] This utility model patent is a new type of battery cell loading device, such as Figure 1 As shown, it is composed of a new graphite boat frame 4 and a graphite boat clamping point 3. The new graphite boat frame 4 includes:

[0015] 1. Graphite boat frame rectangular structure segment. Figure 1 As shown, the rectangular structure section 43 of the graphite boat frame cooperates with the graphite boat clamping point 2 to carry the battery cell 1.

[0016] It should be noted that the length bd of the rectangular structure section 43 of the graphite boat frame is 1.5-3 cm, and the length of the contact portion bc between the battery cell and the rectangular structure section of the graphite boat frame is 1-2.5 cm.

[0017] Graphite boat frame gradient structure segment, such as Figure 1 As shown, there is a certain inclination angle e between the graphite boat frame gradient structure segment 42 and the lower surface of the battery cell 1, and the battery cell 1 does not contact the graphite boat frame gradient structure segment 42; the intersection b between the graphite boat frame gradient structure segment 42 and the graphite boat frame rectangular structure segment 43 is connected by an arc.

[0018] It is important to note that the length ab of the waist of the graphite boat frame gradient structure section 42 is 3-5 cm, the inclination angle e between the waist of the graphite boat frame gradient structure section 42 and the lower surface of the battery piece 1 is 1-20°, and the radius of the arc at the junction between the graphite boat frame gradient structure section 42 and the graphite boat horizontal structure 43 is 0.5-1 cm.

[0019] Graphite boat frame smooth structure. As shown in Figure 1 , the graphite boat frame smooth structure section 41 is shaped as a circular arc with a certain radius, tangent to the intersection point a of the graphite boat frame gradient structure section 42.

[0020] It is important to note that the radius of the circular arc in the graphite boat frame smooth structure section 41 is 0.2-0.5 cm.

[0021] Finally, it is further emphasized that the graphite boat frame gradient structure section 42 and the graphite boat frame smooth structure section 41 do not contact the battery piece 1. As shown in Figure 2 , compared with the design of the traditional graphite boat frame 2, it does not affect the uniformity of the electric field distribution between the two graphite boat frames. On the contrary, the circular arc treatment at the junction between the graphite boat frame gradient structure section 42 and the graphite boat frame rectangular structure section 43, and the graphite boat frame smooth structure section 41 can change the uniformity of the charge distribution in the graphite boat frame. Embodiment

[0022] A new battery piece loading device:

[0023] Graphite boat frame rectangular structure section. As shown in Figure 1 , the length bd of the graphite boat frame rectangular structure section 43 is 1.5 cm, and the length bc of the contact part between the battery piece and the graphite boat frame rectangular structure section is 1.0 cm.

[0024] Graphite boat frame gradient structure. As shown in Figure 1 , there is a certain inclination angle e between the waist of the graphite boat frame gradient structure section 42 and the lower surface of the battery piece 1, and the battery piece 1 does not contact the graphite boat frame gradient structure section 42; the junction b between the graphite boat frame gradient structure section 42 and the graphite boat frame rectangular structure section 43 is connected by an arc.

[0025] The length ab of the waist of the graphite boat frame gradient structure section 42 is 3.0 cm, the inclination angle e between the graphite boat frame gradient structure section 42 and the lower surface of the battery piece 1 is 1°, and the radius of the arc at the junction between the graphite boat frame gradient structure section 42 and the graphite boat horizontal structure 43 is 1.0 cm.

[0026] Graphite boat frame smooth structure. As shown in Figure 1 , the graphite boat frame smooth structure section 41 is shaped as a circular arc with a certain radius, tangent to the intersection point a of the graphite boat frame gradient structure section 42. The radius of the circular arc in the graphite boat frame smooth structure section 41 is 0.5 mm.

Claims

1. A novel graphite boat frame, characterized by: The graphite boat frame round smooth structure section (41), the graphite boat frame gradient structure section (42) and the graphite boat rectangular structure section (43) are sequentially connected, the graphite boat frame round smooth structure section (41) is a semicircular plate, the graphite boat frame gradient structure section (42) is a isosceles trapezoidal plate, and the graphite boat rectangular structure section (43) is a rectangular plate, and the graphite boat rectangular structure section (43) is provided with a graphite boat clamping point (3).

2. A novel graphite boat frame as claimed in claim 1, wherein: The length of the graphite boat rectangular structure section (43) is 1.5-3 cm, and when the silicon wafer is loaded on the graphite boat, the length of the contact part of the silicon wafer and the graphite boat rectangular structure section (43) is 1-2.5 cm.

3. The novel graphite boat frame according to claim 1, characterized in that: The waist length of the graphite boat frame gradient structure section (42) is 3-5 cm, and when the silicon wafer is loaded on the graphite boat, the included angle e of the silicon wafer and the graphite boat frame gradient structure section (42) is 1-20°.

4. The novel graphite boat frame according to claim 1, characterized in that: The radius of the graphite boat frame round smooth structure section (41) is 0.2-0.5 cm.

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