Polycrystalline silicon heterojunction back contact battery

Abstract

The utility model discloses a polycrystalline silicon heterojunction back contact battery, which comprises a battery body, a back convex piece, a fixed hole, a U-shaped heat conducting plate, a fin strip, a side through hole, a fixed column, an inner groove and a heat conducting rubber strip, the back convex piece protrudes from the back piece surface of the battery body, the surface of the back convex piece is concavely provided with the fixed hole, and the U-shaped heat conducting plate is arranged in the fixed hole. The back of the cell body of the polycrystalline silicon heterojunction back contact cell is provided with the back lug, the back lug is provided with the U-shaped heat conduction plate, and when the cell body is installed at the frame of the solar panel, the back lug is in contact with the frame of the solar panel through the wing strip of the U-shaped heat conduction plate, so that a spaced ventilation position exists between the frame of the solar panel and the cell body; the heat dissipation space after the battery body is installed is guaranteed, the back protruding pieces can be matched with the heat conduction rubber strips to transmit heat to the U-shaped heat conduction plates and the fin strips, when natural wind or wind power of a fan passes through the fin strips, the heat at the fin strips can be taken away, and it is guaranteed that the battery body can conduct efficient heat dissipation.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a polycrystalline silicon heterojunction back contact battery. Background Art

[0002] Solar cells are well-known devices for converting solar radiation into electrical energy. They can be fabricated on semiconductor wafers using semiconductor processing techniques. In a back contact solar cell, the diffused regions and the metal contacts connected to them are both located on the back surface of the solar cell. The contacts allow an external circuit to be connected to and powered by the solar cell.

[0003] Application No.: CN201610206738.2 discloses a method for manufacturing a high-efficiency solar cell. The method includes providing a thin dielectric layer and a doped polysilicon layer on the back surface of a silicon substrate. Subsequently, both a high-quality oxide layer and a wide-bandgap doped semiconductor layer can be formed on the back and front surfaces of the silicon substrate. Then, a metallization process can be performed to deposit metal fingers on the doped polysilicon layer through contact openings. The deposited metal fingers can form a first metal grid line. A second metal grid line can be formed by directly depositing metal on the emitter region on the back surface of the silicon substrate, thereby eliminating the need for contact openings for the second metal grid line. Among these advantages, the method for manufacturing a solar cell provides reduced thermal processes, reduced etching steps, increased efficiency, and simplified procedures for manufacturing high-efficiency solar cells.

[0004] As a solar cell, the existing polycrystalline silicon heterojunction back contact battery often operates in a hot environment when used for solar power generation. The back surface of this polycrystalline silicon heterojunction back contact battery is usually attached to the surface of the solar panel. When the polycrystalline silicon heterojunction back contact battery dissipates heat, it can only rely on natural wind or a fan for heat dissipation. Since the fitting surface between the polycrystalline silicon heterojunction back contact battery and the solar panel is too tight, the heat dissipation gap of the polycrystalline silicon heterojunction back contact battery is small, thereby affecting the heat dissipation effect of the polycrystalline silicon heterojunction back contact battery. For this reason, we propose a polycrystalline silicon heterojunction back contact battery. Summary of the Utility Model

[0005] The main object of the present utility model is to provide a polysilicon heterojunction back contact battery. A back convex piece is provided on the back surface of the battery body of the polysilicon heterojunction back contact battery, and a U-shaped heat conducting plate is installed at the back convex piece. When the battery body is installed at the frame of the solar panel, the back convex piece contacts the frame of the solar panel with the fins of the U-shaped heat conducting plate, so that there is an interval ventilation position between the frame of the solar panel and the battery body, ensuring the heat dissipation space after the battery body is installed; and the back convex piece can transfer heat to the U-shaped heat conducting plate and the fins in cooperation with the heat conducting rubber strip. When natural wind or the wind of a fan passes between the fins, the heat at the fins can be taken away, ensuring that the battery body can dissipate heat efficiently, and effectively solving the problems in the background art.

[0006] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0007] The polysilicon heterojunction back contact battery includes a battery body, and also includes a back convex piece, a fixing hole, a U-shaped heat conducting plate, fins, side through holes, fixing columns, inner grooves and a heat conducting rubber strip. The back surface of the battery body protrudes with a back convex piece, and a fixing hole is recessed on the surface of the back convex piece. A U-shaped heat conducting plate is clamped outside the back convex piece, and fixing columns for clamping into the fixing holes are integrally formed on the inner groove surface of the U-shaped heat conducting plate. An inner groove is recessed on the inner groove surface of the U-shaped heat conducting plate outside the fixing columns, and a heat conducting rubber strip for adhering to the back convex piece is adhered in the inner groove. Fins are integrally formed on the back plate surface of the U-shaped heat conducting plate away from its inner groove surface, and side through holes penetrate through the surface of the fins.

[0008] Further, three groups of side through holes are arranged on the surface of the fins;

[0009] By adopting the above technical solution, there are more side through holes at the fins for ventilation, improving the heat dissipation ability of the fins.

[0010] Further, three groups of fixing holes are distributed at three points on the surface of the back convex piece, and three groups of fixing columns are distributed at three points on the inner groove surface of the U-shaped heat conducting plate;

[0011] By adopting the above technical solution, the three groups of fixing holes of the back convex piece can be clamped and connected with the three groups of fixing columns of the U-shaped heat conducting plate.

[0012] Further, the size of the inner cavity of the U-shaped heat conducting plate is the same as the size of the sheet body of the back convex piece;

[0013] By adopting the above technical solution, the U-shaped heat conducting plate can be smoothly clamped at the back convex piece for clamping and connection.

[0014] Further, three groups of inner grooves are arranged on the inner groove wall of the U-shaped heat conducting plate, and heat conducting rubber strips are adhered in the three groups of cavities of the inner grooves;

[0015] By adopting the above technical solution, the three groups of inner grooves inside the U-shaped heat conducting plate can be adhered to the convex back pieces in cooperation with heat conducting rubber strips for connection.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] In the utility model, convex back pieces are arranged on the back of the battery body of the polycrystalline silicon heterojunction back contact battery, and a U-shaped heat conducting plate is installed at the convex back pieces. When the battery body is installed at the frame of the solar panel, the convex back pieces contact the frame of the solar panel with the fins of the U-shaped heat conducting plate, so that there is an interval ventilation position between the frame of the solar panel and the battery body, ensuring the heat dissipation space after the battery body is installed;

[0018] Moreover, the convex back pieces can transfer heat to the U-shaped heat conducting plate and the fins in cooperation with heat conducting rubber strips. When natural wind or the wind of a fan passes between the fins, the heat at the fins can be taken away, ensuring that the battery body can dissipate heat efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the polycrystalline silicon heterojunction back contact battery of the utility model.

[0020] Figure 2 It is a schematic diagram of the separation of the convex back piece and the U-shaped heat conducting plate of the polycrystalline silicon heterojunction back contact battery of the utility model.

[0021] Figure 3 It is a schematic diagram of the structure of the U-shaped heat conducting plate of the polycrystalline silicon heterojunction back contact battery of the utility model.

[0022] In the figure: 1. Battery body; 2. Convex back piece; 3. Fixed hole; 4. U-shaped heat conducting plate; 5. Fin; 6. Side through hole; 7. Fixed column; 8. Inner groove; 9. Heat conducting rubber strip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to make the technical means, creative features, achieved purposes and effects of the utility model easy to understand, the utility model will be further described below in conjunction with the specific embodiments.

[0024] Such as Figures 1 - 3As shown, the polycrystalline silicon heterojunction back contact battery includes a battery body 1, and also includes a back tab 2, a fixing hole 3, a U-shaped heat conducting plate 4, fin strips 5, side through holes 6, fixing columns 7, inner grooves 8 and heat conducting rubber strips 9. The back surface of the battery body 1 protrudes with a back tab 2, and a fixing hole 3 is recessed on the surface of the back tab 2. The outside of the back tab 2 is covered with a U-shaped heat conducting plate 4, and fixing columns 7 for engaging with the fixing holes 3 are integrally formed on the inner groove surface of the U-shaped heat conducting plate 4. An inner groove 8 is recessed on the inner groove surface of the U-shaped heat conducting plate 4 outside the fixing columns 7, and a heat conducting rubber strip 9 for adhering to the back tab 2 is adhered in the inner groove 8. The back plate surface of the U-shaped heat conducting plate 4 away from its inner groove surface is integrally formed with fin strips 5, and side through holes 6 penetrate through the surface of the fin strips 5.

[0025] Among them, three groups of the side through holes 6 are arranged on the surface of the fin strips 5;

[0026] By adopting the above technical solution, there are more side through holes 6 at the fin strips 5 for ventilation, which improves the heat dissipation capacity of the fin strips 5.

[0027] Among them, three groups of the fixing holes 3 are arranged at three points on the surface of the back tab 2, and three groups of the fixing columns 7 are arranged at three points on the inner groove surface of the U-shaped heat conducting plate 4;

[0028] By adopting the above technical solution, the three groups of fixing holes 3 of the back tab 2 can be engaged with the three groups of fixing columns 7 of the U-shaped heat conducting plate 4.

[0029] Among them, the size of the inner cavity of the U-shaped heat conducting plate 4 is the same as the size of the sheet body of the back tab 2;

[0030] By adopting the above technical solution, the U-shaped heat conducting plate 4 can be smoothly engaged with the back tab 2 for connection.

[0031] Among them, three groups of the inner grooves 8 are arranged on the inner groove wall of the U-shaped heat conducting plate 4, and heat conducting rubber strips 9 are adhered in the three groups of cavities of the inner grooves 8;

[0032] By adopting the above technical solution, the three groups of inner grooves 8 inside the U-shaped heat conducting plate 4 cooperate with the heat conducting rubber strips 9 to adhere to the back tab 2 for connection.

[0033] It should be noted that the present utility model is a polysilicon heterojunction back-contact battery. After a back convex piece 2 is arranged on the back surface of the battery body 1 of the polysilicon heterojunction back-contact battery, a U-shaped heat-conducting plate 4 with fin strips 5 can be clamped at the back convex piece 2, and then the U-shaped heat-conducting plate 4 is clamped and connected in a fixed hole 3 of the back convex piece 2 by a fixed column 7. Moreover, the three groups of inner grooves 8 inside the U-shaped heat-conducting plate 4 can be adhered to the back convex piece 2 in cooperation with heat-conducting rubber strips 9 for connection. When the battery body 1 is installed at the frame of the solar panel, the fin strips 5 of the U-shaped heat-conducting plate 4 contact the frame of the solar panel through the back convex piece 2, so that there is an interval ventilation position between the frame of the solar panel and the battery body 1. And the back convex piece 2 can transfer heat to the U-shaped heat-conducting plate 4 and the fin strips 5, so that when the wind passes through the fin strips 5, the heat is carried away, assisting the battery body 1 to dissipate heat efficiently. The grid lines on the back surface of the battery body 1 can be arranged at the back convex piece 2.

[0034] It should be noted that the present utility model is a polysilicon heterojunction back-contact battery, and the components in the present utility model are all components known to those skilled in the art, and their structures and principles can all be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0035] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. Heterojunction back contact polysilicon solar cell, comprising a cell body (1), characterized in that: It further includes a back convex piece (2), a fixed hole (3), a U-shaped heat conduction plate (4), fin strips (5), side through holes (6), fixed columns (7), inner grooves (8) and heat conduction rubber strips (9). A back convex piece (2) protrudes from the back surface of the battery body (1), and a fixed hole (3) is recessed on the surface of the back convex piece (2). A U-shaped heat conduction plate (4) is sleeved outside the back convex piece (2), and fixed columns (7) for being inserted into the fixed holes (3) are integrally formed on the inner groove surface of the U-shaped heat conduction plate (4). Inner grooves (8) are recessed on the inner groove surface of the U-shaped heat conduction plate (4) outside the fixed columns (7), and heat conduction rubber strips (9) for adhering to the back convex piece (2) are adhered in the inner grooves (8). Fin strips (5) are integrally formed on the back plate surface of the U-shaped heat conduction plate (4) away from its inner groove surface, and side through holes (6) penetrate through the surface of the fin strips (5).

2. The heterojunction back contact polysilicon solar cell according to claim 1, wherein: Three groups of the side through holes (6) are arranged on the surface of the fin strips (5).

3. The polycrystalline silicon heterojunction back contact battery according to claim 1, wherein: Three groups of the fixed holes (3) are distributed at three points on the surface of the back convex piece (2), and three groups of the fixed columns (7) are distributed at three points on the inner groove surface of the U-shaped heat conduction plate (4).

4. The polycrystalline silicon heterojunction back contact battery according to claim 1, characterized in that: The size of the inner groove cavity of the U-shaped heat conduction plate (4) is the same as the size of the piece body of the back convex piece (2).

5. The heterojunction back contact polysilicon cell according to claim 1, characterized in that: Three groups of the inner grooves (8) are arranged on the inner groove wall of the U-shaped heat conduction plate (4), and heat conduction rubber strips (9) are adhered in the three groups of groove cavities of the inner grooves (8).

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