CN105514185B - A kind of middle low-concentration solar cell - Google Patents

Abstract

The invention discloses a medium-low power concentrating solar cell. The concentrating solar cell is cut from a whole solar cell. Both sides of the front side of the photovoltaic solar cell are main grid lines, and on the main grid lines, there are evenly distributed a number of guiding columns with conductive functions along its length direction. The back electrode A of the solar cell is connected as one pole of the concentrating solar cell, and the back electrode B corresponding to the back of the concentrating solar cell and the effective light-receiving area is used as the other pole of the concentrating solar cell. Both the positive and negative electrodes are on the back of the concentrating solar cell. In the present invention, the positive and negative electrodes of the concentrating solar cell are arranged on the same surface, so that the solar cell is very easy to be processed by SMT. Concentrating solar cells.

Description

A medium and low power concentrated solar cell

technical field

The invention belongs to the technical field of solar energy utilization, and in particular relates to a medium-low power concentrating solar cell.

Background technique

In the current photovoltaic photovoltaic system, the market share of crystalline silicon solar cells accounts for more than 80%, and the flat panel components of crystalline silicon solar cells are mainly composed of solar ultra-clear glass, adhesive (EVA), solar cells (single crystal or polycrystalline) , the backplane material and the aluminum alloy frame are produced through a series of processes (such as: sorting, welding, lamination, frame packaging, etc.). Although the price of crystalline silicon solar cell components has dropped, there is still a big gap compared with traditional electricity costs such as thermal power and hydropower, and one of the most important factors is the price of solar cells.

Most of the commonly used traditional solar cell components are flat solar cell components, which use ordinary flat glass for light transmission. The size of the solar cell panel needs to be the same as the size of the flat glass to completely receive the incident light from the sun. Solar cell modules are expensive to produce.

The photovoltaic technology that uses an optical lens to concentrate the incident light in a large area to a small cell, thereby reducing the amount of cells used to reduce system costs is called concentrated photovoltaic technology. Concentrating photovoltaic technology can be further divided into high-power concentrating photovoltaic (HCPV, concentrating power greater than 300 times), medium-power concentrating photovoltaic and low-power concentrating photovoltaic technology. The cells used in high concentration photovoltaic technology are generally multi-junction compound solar cells. Due to the complex production process and the raw materials used are rare elements such as arsenic, germanium, indium, etc., the cost is very expensive. The requirements for heat dissipation and heat dissipation are extremely high, thus restricting its development. The cells used for low-to-medium magnification concentrating photovoltaics are generally crystalline silicon solar cells, and because there is currently a lack of batteries specially designed for low-to-medium magnification concentrating photovoltaic technology, the sources of the batteries are generally obtained through 156*156mm or 125*125mm cells are obtained by diamond or laser cutting, while the positive and negative poles of crystalline silicon solar cells are generally distributed on both sides of the solar cell (generally the front is the negative pole, and the back is the positive pole). The two poles are connected in series and parallel. For solar cells with a size of 125*125mm or 156*156mm, manual welding or mechanical welding can be used due to their large size. Due to the small size and poor mechanical properties, it is easy to be damaged or poorly welded, which reduces the production efficiency and yield rate, and greatly increases the cost of the module; and cutting the solar cell will inevitably cause solar cells. Efficiency drops, which leads to an increase in the cost of the entire component, restricting its development.

Contents of the invention

The object of the present invention is to solve the above problems, to provide a low-medium power concentrating solar cell capable of producing concentrating photovoltaic modules by patching.

The technical solution of the present invention is realized in the following way: a medium-low power concentrating solar cell, the concentrating solar cell is cut from a whole piece of solar cell, characterized in that: the front fine grid lines of the concentrating solar cell The corresponding part is the effective light-receiving area. The two sides of the front of the concentrator solar cell are main grid lines, and the light energy injected into the effective light-receiving area is effectively converted into electrical energy. The photoelectric conversion current is collected by the front thin grid lines and then transmitted to On the main grid lines on both sides, there are a number of guide columns with conductive function evenly distributed along the length direction of the main grid lines. The guide columns penetrate through the matrix of the concentrating solar cell and connect The electrodes A are connected, and the guide column conducts the current collected by the front fine grid lines to the back electrode A, which serves as one pole of the concentrating solar cell, and the back electrode B corresponding to the back of the concentrating solar cell and the effective light-receiving area serves as The other pole of the concentrating solar cell, the positive and negative electrodes of the concentrating solar cell are on the back of the concentrating solar cell.

In the medium and low power concentrating solar cell of the present invention, a spacer is provided between the back electrode A and the back electrode B.

In the medium-low power concentrating solar cell of the present invention, the surrounding edges of the effective light-receiving area are passivation regions, and the upper and lower corresponding regions of the busbars on both sides of the concentrating solar cell are passivation regions.

In the present invention, the positive and negative electrodes of the concentrating solar cell are arranged on the same surface, so that the solar cell is very easy to carry out SMT patch processing, so that the production of the concentrating module can be carried out effectively, and at the same time, the process production of this design is also very Simple, high-efficiency concentrating solar cells can be produced at a relatively low cost; and through the passivation area around the effective light-receiving area, the efficiency of medium and low-power concentrating solar cells is guaranteed, and the edge leakage current caused by cutting factors is avoided. produce.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a front view of Fig. 1 .

Fig. 3 is a rear view of Fig. 1 .

FIG. 4 is a side view of FIG. 1 .

The marks in the figure: 1 is the concentrating solar cell, 2 is the front fine grid line, 3 is the effective light receiving area, 4 is the main grid line, 5 is the guide column, 6 is the back electrode A, 7 is the back electrode B, 8 is the Spacer, 9 is a passivation area.

detailed description

Below in conjunction with accompanying drawing, the present invention is described in detail.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, it is a medium and low power concentrating solar cell. The concentrating solar cell 1 is cut from a whole solar cell. The corresponding part of the front fine grid line 2 of the concentrating solar cell 1 is an effective light Area 3, the main grid lines 4 on both sides of the front side of the concentrating solar cell 1, the light energy injected into the effective light-receiving area 3 is effectively converted into electrical energy, and the photoelectrically converted current is collected by the front thin grid lines 2 and then transmitted to the On the main grid lines 4 on both sides, there are several guiding posts 5 with conductive function evenly distributed on the main grid lines 4 along its length direction. The back electrode A6 of the photovoltaic solar cell 1 is connected, and the current guide column 5 conducts the current collected by the front fine grid line 2 to the back electrode A6, as a pole of the concentrating solar cell 1, for most crystalline silicon cells , the front side is the negative pole, so the back electrode A is the negative pole, and the back electrode B7 corresponding to the back side of the concentrating solar cell 1 and the effective light-receiving area 3 is used as the other pole of the concentrating solar cell 1, similarly for most crystalline silicon cells Said, the back electrode B is the positive pole, a spacer 8 is arranged between the back electrode A6 and the back electrode B7, and the positive and negative poles of the concentrating solar cell 1 are all on the back side of the concentrating solar cell 1, so that this The solar cell is very easy to be processed by SMT, so that it can effectively produce the concentrating module. At the same time, the production process of this design is also very simple, and it can produce high-efficiency concentrating solar cells at a relatively low cost.

Wherein, the surrounding edges of the effective light-receiving region 3 are passivation regions 9, and the upper and lower corresponding regions of the busbars 4 on both sides of the concentrating solar cell 1 are passivation regions 9, which ensures the low-power concentrating solar cell High efficiency, avoiding the generation of edge leakage current caused by cutting factors.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (3)

1. a kind of middle low-concentration solar cell, the concentrator solar cell（1）Formed by the cutting of monoblock solar cell, its feature It is：The concentrator solar cell（1）The thin grid line in front（2）Corresponding part is effective light area（3）, the optically focused sun Battery（1）Positive both sides be main gate line（4）, it is injected into effective light area（3）Luminous energy be effectively converted as electric energy, photoelectricity The electric current of conversion passes through positive thin grid line（2）The main gate line on both sides is reached after being collected（4）On, in the main gate line（4）On Some diversion columns with conducting function are evenly distributed with along its length（5）, the diversion column（5）Through optically focused sun electricity Pond（1）Matrix and and concentrator solar cell（1）Backplate A（6）It is connected, the diversion column（5）By positive thin grid line（2） The electric current of collection is conducted to backplate A（6）On, it is used as concentrator solar cell（1）A pole, the concentrator solar cell（1） The back side, effective light area（3）Corresponding backplate B（7）It is used as concentrator solar cell（1）An other pole, the optically focused Solar cell（1）Both positive and negative polarity in concentrator solar cell（1）The back side.

2. middle low-concentration solar cell according to claim 1, it is characterised in that：The backplate A（6）With the back side Electrode B（7）Between be provided with spacer region（8）.

3. middle low-concentration solar cell according to claim 1 or 2, it is characterised in that：Effective light area（3） Edge be passivation region（9）, the concentrator solar cell（1）Upper both sides main gate line（4）Upper and lower corresponding region to be blunt Change area（9）.