CN103311350A - A uniform light and heat dissipation device for concentrating photovoltaics - Google Patents

Abstract

The invention discloses a light-dissipating and heat-dissipating device for concentrating photovoltaics. The light-dissipating and heat-dissipating device includes a side part and a bottom surface part. The side part and the bottom surface part form an accommodating space, and solar cells are installed in the accommodating space. The bottom of the inside, the side part includes an internal reflective surface arranged on the inside and a side cooling fin arranged on the outside, the bottom part of the bottom part is provided with a bottom cooling fin, the internal reflecting surface, the side cooling fins and the bottom cooling fin It is an integrally formed structure, and the condenser lens is correspondingly arranged on the upper side of the entrance of the accommodating space. The invention is a device that integrates light uniformity and heat dissipation, exists as a whole, is composed of materials of the same material, and is relatively convenient and simple to manufacture.

Description

A uniform light and heat dissipation device for concentrating photovoltaics

technical field

The invention relates to the technical field of solar energy applications, in particular to a concentrating photovoltaic device for uniform light and heat dissipation.

Background technique

Concentrating photovoltaic power generation technology is a power generation technology that uses an optical system to gather solar energy on solar cells and converts light energy into electrical energy by using the photovoltaic effect. The third generation power generation technology is an important development direction in the utilization of solar power generation. Concentrating photovoltaic power generation technology focuses a large area of sunlight onto a small solar cell, effectively reducing the amount of semiconductor materials used and greatly reducing system costs.

The uniformity and heat dissipation of the focal spot have always been difficult problems in the development of concentrated photovoltaic technology. In terms of the uniformity of the focal spot, optical prisms or light funnels are generally used at present. The disadvantage of using optical prisms is that the tracking accuracy is not high, and the light loss is serious when the light deflection angle is large, and it cannot reflect the light with a large angle deviation to The surface of solar cells causes energy waste; light funnel homogenizers such as "A Concentrating Light Homogenizer for Solar Concentrated Photovoltaic Power Generation" applied by Pony Solar Co., Ltd. (application number 201020234319.8), light funnel The internal sidewalls of the light are not treated, and the energy loss is serious when the light is reflected in the light funnel. In terms of heat dissipation, two methods of passive heat dissipation and active heat dissipation are generally used at present. Passive heat dissipation, such as a concentrating photovoltaic power generation device (application number 200920257675.9) applied by Lida Optoelectronics Co., Ltd., only places heat dissipation under the solar cells In order to achieve a better heat dissipation effect, the required heat sink is relatively large; active cooling generally adopts circulating water cooling or fan cooling, but the disadvantage is that it is relatively bulky and requires additional energy to drive.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a light uniformity and heat dissipation device integrating light uniformity and heat dissipation. It mainly includes three parts: internal reflective surface, bottom heat sink, and side heat sink. It is a device that integrates light uniformity and heat dissipation. It redistributes the focused light through the internal reflective surface, so that the light reaches the bottom evenly for heat dissipation. On the solar cells on the top of the device, it can effectively dissipate the heat of the solar cells through the bottom heat sink and the side heat sink.

For realizing above object, the technical scheme that the present invention takes is:

A uniform light and heat dissipation device for concentrating photovoltaics, the uniform light and heat dissipation device includes a side part and a bottom surface part, the side part and the bottom surface part form an accommodation space, and solar cells are installed at the bottom of the accommodation space, The side part includes an internal reflective surface arranged on the inner side and a side cooling fin arranged on the outside, the bottom part of the bottom part is provided with a bottom cooling fin, and the internal reflecting surface, the side cooling fins and the bottom cooling fin are integrally formed. , and the condenser is correspondingly arranged on the upper side of the entrance of the accommodating space.

The internal reflective surface of the uniform light and heat dissipation device is coated with reflective coatings such as aluminum and silver, which can improve the reflectivity of visible light and absorb part of infrared light. It can effectively reduce the loss of reflected energy and reduce the heat reaching the solar cells.

The heat dissipation part in the uniform light heat dissipation device includes two parts: the bottom heat sink and the side heat sink. The addition of the side heat sink can effectively solve the traditional problem that only the bottom heat sink has an unsatisfactory heat dissipation effect. The side heat sink and the side heat sink The simultaneous application of the bottom cooling fins can enable the solar cells to dissipate heat in all directions, and the heat dissipation effect is better, effectively improving the photoelectric conversion efficiency of the solar cells.

When the uniform light and heat dissipation device of the patent of the present invention is used for concentrated photovoltaic power generation, the solar cells are placed at the inner bottom of the uniform light and heat dissipation device, and the bottom of the solar cells and the upper part of the bottom radiator are coated with thermal conductive silicone grease or Materials with good thermal conductivity such as silver paste can dissipate heat better. Sunlight is focused by the concentrating system on the internal reflection surface of the uniform light heat dissipation device, and evenly reaches the solar cell after reflection, and part of the light energy is converted into electrical energy, and part of it is converted into heat energy, while the side and bottom heat sinks can quickly dissipate the heat. Take away, thereby effectively improving the photoelectric conversion efficiency of solar cells.

The side cooling fins or/and the bottom cooling fins are composed of a plurality of rectangular cooling sub-fins uniformly distributed along their longitudinal or transverse directions.

The side cooling fins or/and the bottom cooling fins are composed of a plurality of circular cooling sub-fins stacked in sequence, or are composed of circular cooling sub-fins and cylindrical cooling sub-fins, or are composed of any irregular-shaped cooling sub-fins. slice composition.

Compared with the prior art, the present invention has the following advantages:

1. The light uniform heat dissipation device mainly includes three parts: the internal reflection surface, the bottom heat sink, and the side heat sink. It is a device that integrates light uniformity and heat dissipation. It exists as a whole and is composed of materials of the same material. It is more convenient and simple.

2. The heat dissipation part includes two parts: the bottom heat sink and the side heat sink. The addition of the side heat sink can effectively solve the problem that the traditional cooling effect of only the bottom heat sink is not ideal. The simultaneous application of the side heat sink and the bottom heat sink, It can make the solar cells perform all-round heat dissipation.

3. The internal reflective surface is coated with a reflective coating, which can improve the reflectivity of visible light and absorb part of infrared light, which can effectively reduce the loss of reflected energy.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the uniform light and heat dissipation device of the present invention;

Fig. 2 is a schematic structural diagram of a concentrating photovoltaic module applying the structure of Fig. 1;

Fig. 3 is a schematic structural view of Embodiment 2 of the uniform light and heat dissipation device of the present invention;

FIG. 4 is a schematic structural view of a concentrated photovoltaic module applying the structure in FIG. 3 .

Among them: 1. Internal reflective surface; 2. Side heat sink; 3. Bottom heat sink; 4. Concentrating mirror; 5. Uniform light heat dissipation device; 6. Solar cells.

Detailed ways

The content of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 1, a uniform light and heat dissipation device for concentrated photovoltaics mainly includes three parts: an internal reflection surface 1, a bottom heat dissipation fin 3, and a side heat dissipation fin 2. The internal reflection surface 1 is coated with an aluminum film with high reflectivity , the bottom and side cooling fins are composed of a plurality of rectangular cooling sub-fins arranged horizontally and vertically along the sides. Figure 2 is a schematic diagram of a concentrating photovoltaic module. The solar cells 6 are placed on the inner bottom of the uniform light and heat dissipation device 5, and the bottom of the solar cell 6 and the inner bottom of the uniform light and heat dissipation device 5 are coated with thermally conductive silicone grease After the sunlight is focused by the condenser lens 4, it is reflected by the internal reflection surface 1, and the obtained relatively uniform focal spot reaches the surface of the solar cell 6, and the light energy is partially converted into electrical energy and partially converted into heat energy, while the side heat sink 2 And the heat sink 3 at the bottom can quickly take away the heat, thereby effectively improving the photoelectric conversion efficiency of the solar cell.

Example 2

As shown in Figure 3, a uniform light and heat dissipation device for concentrated photovoltaics mainly includes three parts: an internal reflection surface 1, a bottom heat sink 3, and a side heat sink 2. The internal reflection surface 1 is coated with a silver film with high reflectivity , the heat sinks used on the bottom and sides are composed of circular, cylindrical or other irregularly shaped heat sinks. Figure 4 is a schematic diagram of a concentrating photovoltaic module. The solar cell 6 is placed on the inner bottom of the uniform light and heat dissipation device 5, and the bottom of the solar cell 6 and the inner bottom of the uniform light and heat dissipation device 5 are coated with silver paste. After the sunlight is focused by the concentrator 4, it is reflected by the internal reflection surface 1, and the obtained relatively uniform focal spot reaches the surface of the solar cell 6, and part of the light energy is converted into electrical energy, and part of it is converted into heat energy, while the side heat sink 2 and the The heat sink 3 at the bottom can quickly take away the heat, thereby effectively improving the photoelectric conversion efficiency of the solar cells.

The above detailed description is a specific description of the feasible embodiments of the present invention. This embodiment is not used to limit the protection scope of the present invention. All equivalent implementations or changes that do not depart from the present invention should be included in the protection scope of this case. middle.

Claims (6)

1. A uniform light and heat dissipation device for concentrating photovoltaics, characterized in that the uniform light and heat dissipation device (5) includes a side part and a bottom part, and the side part and the bottom part form an accommodation space, and the solar cells ( 6) Installed on the bottom of the accommodating space, the side part includes an internal reflection surface (1) arranged on the inside and a side cooling fin (2) arranged on the outside, and the bottom part of the bottom part is provided with a bottom cooling fin (3), the internal reflection surface (1), the side cooling fins (2) and the bottom cooling fins (3) are integrally formed, and the condenser mirror (4) is correspondingly arranged on the upper side of the entrance of the accommodating space. 2. The uniform light and heat dissipation device for concentrating photovoltaics according to claim 1, characterized in that, the internal reflection surface (1) is coated with a reflective coating. 3. The uniform light and heat dissipation device for concentrating photovoltaics according to claim 2, characterized in that the reflective coating is aluminum or silver. 4. The uniform light and heat dissipation device for concentrating photovoltaics according to claim 1, characterized in that the upper part of the bottom surface and the lower part of the solar cells (6) are coated with thermally conductive silicone grease or silver paste. 5. The concentrating photovoltaic uniform light and heat dissipation device according to claim 1, characterized in that, the side heat sink (2) or/and the bottom heat sink (3) are composed of a plurality of uniformly distributed longitudinally or transversely Composed of rectangular fins. 6. The light-dissipating and heat-dissipating device for concentrating photovoltaics according to claim 1, characterized in that, the side heat sink (2) or/and the bottom heat sink (3) are sequentially stacked by a plurality of circular heat sinks Composed, or composed of circular heat sinks and cylindrical heat sinks alternately distributed.

Images