CN206629012U - A kind of double-sided solar battery electricity generation system waterborne - Google Patents

Abstract

The utility model discloses a double-sided solar battery power generation system on water, which comprises a double-sided solar battery component array, a bracket system, a light-gathering element and a floating support, and the floating support can make the double-sided solar battery component array, the bracket system and the concentrating element are floating on the water surface; the support system is arranged on a floating support, and the double-sided solar cell assembly array is supported on the support system; the light concentrating element is arranged under the double-sided solar cell assembly array . By adopting the utility model, solar power generation can be realized on the water surface, and both the front and the back of the double-sided solar cell module array can absorb sunlight; The sunlight absorbed by the back of the solar cell module array improves the overall power generation of the double-sided solar cell power generation system.

Description

A double-sided solar cell power generation system on water

technical field

The utility model relates to the technical field of solar cell component systems, in particular to a double-sided solar cell power generation system on water.

Background technique

Today, with the shortage of traditional energy sources and increasing environmental pressure, photovoltaic solar power generation is favored by people because of its non-polluting and renewable characteristics, and it is a renewable energy source with broad development prospects. Ordinary photovoltaic power generation system is composed of solar cell components, solar controller, battery and so on.

The solar battery module is the core part of the solar power generation system. Its function is to convert solar energy into electrical energy, and then send the electricity to the storage battery for storage, or push the load to work.

A solar cell is a device that effectively absorbs solar radiation energy and converts light energy into electrical energy by using the photovoltaic effect. When sunlight shines on a semiconductor P-N junction (P-N Junction), a new hole-electron pair (V-E pair) is formed. ), under the action of the P-N junction electric field, holes flow from the N region to the P region, electrons flow from the P region to the N region, and a current is formed after the circuit is turned on.

With the development of solar cell technology, double-sided solar cells have attracted more and more attention from the industry due to their high photoelectric conversion efficiency, and are expected to enter large-scale industrial production. Therefore, it is necessary to modify the conventional single-sided solar cell power generation system to give full play to the advantages of the double-sided solar cell power generation system.

Utility model content

The technical problem to be solved by the utility model is to provide a double-sided solar power generation system on water, which can realize solar power generation on the water surface, and both the front and back of the double-sided solar cell module array can absorb sunlight; For power generation, the back surface reflects sunlight through the water surface, increasing the sunlight absorbed by the back of the double-sided solar cell module array, and improving the overall power generation of the double-sided solar cell power generation system.

In order to solve the above technical problems, the utility model provides a double-sided solar power generation system on water, which includes a double-sided solar cell The module array, the support system and the concentrating element are floating on the water surface; the support system is arranged on a floating support, and the double-sided solar cell module array is supported on the support system; the light concentrating element is arranged on both sides Below the solar battery module array, it is used for converging sunlight reflected by the water surface to the back of the double-sided solar battery module array through refraction and/or reflection.

As an improvement to the above scheme, the light concentrating element is a reflector arranged at different heights directly below the double-sided solar cell module array, which is used to reflect the sunlight reflected on the reflector by the water surface and converge to the double-sided solar cell module array through re-reflection. The back side of the solar cell module array.

As an improvement of the above solution, the light concentrating element is a total reflection mirror arranged at different heights directly below the double-sided solar cell module array, which is used to converge the sunlight reflected by the water surface to the double-sided solar cell module array through reflection or refraction according to the incident angle. The back side of the solar cell module array.

As an improvement of the above solution, the support system includes a support and an angle adjustment mechanism, and the angle adjustment mechanism can drive the double-sided solar cell module array to turn over, so that the front side of the double-sided solar cell module array can obtain maximum direct sunlight.

As an improvement to the above solution, the floating support is a ship or an artificial floating platform.

As an improvement to the above solution, the double-sided solar cell module array is a P-type double-sided solar cell module array or an N-type double-sided solar cell module array.

As an improvement of the above solution, the solar cell module array is a P-type double-sided solar cell module array, which includes P-type double-sided solar cells arranged in an array, and the P-type double-sided solar cells include a back silver main grid, an aluminum grid line, back silicon nitride film, back aluminum oxide film, P-type silicon, N-type emitter, front silicon nitride film and positive silver electrode; said back silicon nitride film, back aluminum oxide film, P-type silicon, N-type The emitter, the front silicon nitride film and the front silver electrode are sequentially stacked and connected from bottom to top;

The silicon nitride film on the back and the aluminum oxide film on the back are laser-grooved to form 30-500 laser grooved areas arranged in parallel, and at least one group of laser grooved units is arranged in each laser grooved area, and the aluminum grid The line is connected to the P-type silicon through the laser grooved area; the aluminum grid line is vertically connected to the back silver busbar.

As an improvement of the above scheme, when 2 or more sets of laser grooving units are set in each laser grooving area, each group of laser grooving units is arranged in parallel, and the distance between two adjacent groups of laser grooving units is 5 -480 μm.

As an improvement of the above solution, each group of laser grooved units includes at least one laser grooved unit, and the pattern of the laser grooved units is a circle, an ellipse, a triangle, a quadrangle, a pentagon, a hexagon, a cross or a star shape.

As an improvement of the above scheme, each group of laser grooving units includes a laser grooving unit with a pattern of strips and rectangles; the same group of laser grooving units are arranged at intervals along the extending direction of the aluminum grid lines, and two adjacent laser grooving units The spacing distance is 0.01-50mm; the back silver main grid is a continuous straight grid; or the back silver main grid is arranged in intervals; or the back silver main grid is arranged in intervals, and each adjacent segment are connected by connected regions.

Implementing the utility model has the following beneficial effects:

The utility model includes a double-sided solar cell assembly array, a bracket system, a light-concentrating element and a floating support, which can realize solar power generation on the water surface, and both the front and the back of the double-sided solar cell assembly array can absorb sunlight; Direct sunlight power generation, the back side reflects sunlight through the water surface, increases the sunlight absorbed by the back side of the double-sided solar cell module array, and improves the overall power generation of the double-sided solar cell power generation system.

Description of drawings

Fig. 1 is a structural schematic diagram of the first embodiment of a double-sided solar power generation system on water of the utility model;

Fig. 2 is a structural schematic diagram of the second embodiment of a double-sided solar power generation system on water of the utility model;

Fig. 3 is a schematic structural view of a P-type double-sided solar cell of the present invention;

Fig. 4 is another schematic structural view of the P-type double-sided solar cell of the present invention;

Fig. 5 is another schematic structural view of the P-type double-sided solar cell of the present invention;

Fig. 6 is another schematic structural view of the P-type double-sided solar cell of the present invention;

Fig. 7 is a schematic structural diagram of the first embodiment of the laser grooved area of the P-type double-sided solar cell of the present invention;

Fig. 8 is a schematic structural diagram of the second embodiment of the laser grooved area of the P-type double-sided solar cell of the present invention;

Fig. 9 is a structural schematic diagram of the third embodiment of the laser grooved area of the P-type double-sided solar cell of the present invention;

Fig. 10 is a structural schematic diagram of the fourth embodiment of the laser grooved area of the P-type double-sided solar cell of the present invention;

Fig. 11 is a schematic structural diagram of the fifth embodiment of the laser grooved area of the P-type double-sided solar cell of the present invention;

Fig. 12 is a schematic structural diagram of the sixth embodiment of the laser grooved area of the P-type double-sided solar cell of the present invention;

Fig. 13 is a structural schematic diagram of the seventh embodiment of the laser grooved area of the P-type double-sided solar cell of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. It is only a statement that the orientation words such as up, down, left, right, front, back, inside, and outside appearing or about to appear in the text of the utility model are only based on the accompanying drawings of the utility model, and it is not a reference to the utility model. New specific restrictions.

As shown in Figure 1, the utility model embodiment provides a double-sided solar power generation system on water, including a double-sided solar cell module array 10, a support system 12, a concentrating element 13 and a floating support 11, the floating support 11 can make the double-sided solar cell module array 10, the support system 12 and the concentrating element 13 float on the water surface; the support system 12 is arranged on the floating support 11, and the described double-sided solar cell On the bracket system 12; the light concentrating element 13 is arranged under the double-sided solar cell module array 10, which is used to gather the sunlight reflected by the water surface to the back of the double-sided solar cell module array 10 through refraction and/or reflection .

The utility model includes a double-sided solar cell assembly array 10, a bracket system 12, a light-concentrating element 13 and a floating support 11, which can realize solar power generation on the water surface, and both the front and the back of the double-sided solar cell assembly array 10 can absorb sunlight. Light; the front side generates electricity through direct sunlight, and the back side reflects sunlight through the water surface, increasing the sunlight absorbed by the backside of the module array, and improving the overall power generation of the double-sided solar cell power generation system.

According to the first embodiment of the present utility model, the light concentrating element 13 is a reflector arranged at different heights directly below the double-sided solar cell module array 10, which is used to pass sunlight reflected from the water surface onto the reflector. The reflection again converges to the back of the double-sided solar cell module array 10 .

On the water surface, especially the sea surface, the sunlight will be reflected in different directions by the waves on the sea surface, forming ever-changing light spots. The above-mentioned light spots will change the irradiation angle with the waves, and their light paths will intersect each other, which is different from the approximate parallel light when the sun is directly shining. On the other hand, the power generation of the double-sided solar cell module on the water is directly related to the area irradiated by sunlight. Due to cost and safety reasons, the area array of the double-sided solar cell module on the water is limited by the area of the floating support 11. Therefore, it is a feasible method to increase the power generation under the same specifications of the double-sided solar power generation system on water to obtain more sunlight on the back of the double-sided solar cell module.

In this embodiment, the sunlight reflected by the sea surface is reflected to the back of the double-sided solar cell module array 10 by mirrors arranged at different heights directly below the double-sided solar cell module array 10, and after overlapping of multiple reflectors, The characteristic of random reflection of seawater to sunlight is cleverly used to achieve the concentrating effect of a concave mirror much larger than the area of the double-sided solar cell module array 10, so that the back of the double-sided solar cell module can receive more sunlight, thereby improving overall power generation.

As shown in Figure 2, according to the second embodiment of the utility model, the light concentrating element 13 is a total reflection mirror arranged at different heights directly below the double-sided solar cell module array 10, which is used to reflect the surface of the water. The sunlight converges to the back of the double-sided solar cell module array 10 through reflection or refraction according to the incident angle.

In the present embodiment, the incident surface 131 of the total reflection mirror and the sea surface include an angle between 60°-120 degrees, and the exit surface 132 faces the double-sided solar cell module array 10, and the sunlight with an included angle of less than 45° with the sea surface passes from the incident surface 131 enters the total reflection mirror, and irradiates from the exit surface 132 to the back of the double-sided solar cell module array 10 through the reflection of the slope 133; the sun's rays with an angle greater than 45 degrees with the sea surface directly enter from the slope 133 of the total reflection mirror, and pass through the slope 133 The refracted light is emitted from the exit surface 132 and irradiates the back side of the double-sided solar cell module array 10 . The concentrating effect is similar to that of a concave mirror much larger than the area of the double-sided solar cell module array 10, so that the back of the double-sided solar cell module gets more sunlight, thereby increasing the overall power generation.

On the other hand, the light concentrating elements 13 of the two above-mentioned embodiments can gather sunlight from different directions to the back of the double-sided solar cell module array 10, thereby stabilizing the reflected light of the seawater whose brightness is constantly changing, thereby achieving stable current output.

Preferably, the support system 12 includes a support 121 and an angle adjustment mechanism 122, the angle adjustment mechanism 122 can drive the double-sided solar cell module array 10 to turn over, so that the front of the double-sided solar cell module array 10 can obtain maximum direct sunlight. The angle adjustment mechanism 122 can adjust the angle of the double-sided solar cell module array 10 by detecting the sun irradiation angle in real time; it can also actively adjust the angle of the double-sided solar cell module array 10 according to the sun's operation law. The floating support 11 is a ship or an artificial floating platform. Of course, the light concentrating element 13 can also use the support system 12 to reflect and/or refract sunlight to the back of the double-sided solar cell module array 10 in a targeted manner.

The utility model discloses a double-sided solar cell component array 10 , the double-sided solar cell component array 10 is a P-type double-sided solar cell component array 10 or an N-type double-sided solar cell component array 10 . More preferably, the solar cell module array is a P-type double-sided solar cell module array 10, which includes P-type double-sided solar cells arranged in an array.

Correspondingly, as shown in Figure 3, the utility model discloses a P-type double-sided solar cell, including a back silver main grid 1, an aluminum grid line 2, a back silicon nitride film 3, a back aluminum oxide film 4, a P-type Silicon 5, N-type emitter 6, front silicon nitride film 7 and front silver electrode 8; the back silicon nitride film 3, back aluminum oxide film 4, P-type silicon 5, N-type emitter 6, front silicon nitride The film 7 and the positive silver electrode 8 are sequentially stacked and connected from bottom to top;

The back silicon nitride film 3 and the back aluminum oxide film 4 are laser-grooved to form 30-500 groups of laser grooved areas arranged in parallel, and at least one group of laser grooved units 9 is arranged in each laser grooved area. The aluminum grid line 2 is connected to the P-type silicon 5 through the laser grooved area; the aluminum grid line 2 is vertically connected to the back silver main grid 1 .

The utility model improves the existing single-sided solar cell, no longer has an all-aluminum back electric field, but turns it into many aluminum grid lines 2, adopts laser slotting technology on the back silicon nitride film 3 and the back surface The aluminum oxide film 4 is provided with laser grooved areas, and the aluminum grid lines 2 are printed on these parallel laser grooved areas, so as to form local contact with the P-type silicon 5, and the densely arranged parallel aluminum grid lines 2 can not only It plays the role of increasing the open circuit voltage Voc and short circuit current Jsc, reducing the recombination rate of minority carriers, and improving the photoelectric conversion efficiency of the battery. It can replace the all-aluminum back electric field of the existing single-sided battery structure, and the aluminum grid line 2 is not fully covered On the backside of the silicon wafer, sunlight can be projected into the silicon wafer from between the aluminum grid lines 2, so that the backside of the silicon wafer absorbs light energy and greatly improves the photoelectric conversion efficiency of the cell.

Preferably, the number of aluminum grid lines 2 is 30-500 corresponding to the number of laser grooved areas, more preferably, the number of aluminum grid lines 2 is 80-220. The aluminum grid lines 2 can be straight lines, curves, arcs, waves, broken lines, etc. The shape of the laser grooved area corresponds to the aluminum grid lines 2, and its implementation is not limited to the ones mentioned in the present invention. Example.

As shown in Figure 4, it is the backside of the silicon wafer. The aluminum grid line 2 is vertically connected to the back silver busbar 1, and the back silver busbar 1 is a continuous straight gate. Since the silicon nitride film 3 and the aluminum oxide film 4 on the back are provided with Laser slotting area, when aluminum paste is printed to form aluminum grid line 2, the aluminum paste is filled into the laser slotting area, so that aluminum grid line 2 forms local contact with P-type silicon 5, electrons can be transmitted to aluminum grid line 2, and aluminum The back silver main grid 1 intersected by the grid lines 2 collects the electrons on the aluminum grid lines 2, so it can be seen that the aluminum grid lines 2 of the present invention can improve the open circuit voltage Voc and the short circuit current Jsc, and reduce the recombination of minority carriers. efficiency, and the role of electron transmission, can replace the existing single-sided solar cell all-aluminum back electric field, not only reduce the amount of silver paste and aluminum paste, reduce production costs, but also achieve double-sided absorption of light energy, significantly expanding the application of solar cells range and improve photoelectric conversion efficiency.

The back silver main grid 1 described in the utility model can be arranged in intervals and sections in addition to the continuous straight grid as shown in FIG. 4 , as shown in FIG. 5 . It can also be arranged in intervals and sections, and the adjacent sections are connected by connecting areas, as shown in FIG. 6 . The connected area can be a triangle, a quadrilateral, a pentagon, a circle, an arc or a combination of the above figures, at least one connected area, and the width of the connected area is 0.01-4.5mm.

It should be noted that when two or more sets of laser grooving units 9 are arranged in each laser grooving area, each group of laser grooving units 9 is arranged in parallel, and the distance between two adjacent groups of laser grooving units 9 5-480μm.

Each group of laser grooving units 9 includes at least one laser grooving unit 9, and the pattern of the laser grooving units 9 is circular, elliptical, triangular, quadrilateral, pentagonal, hexagonal, cross or star.

The following is further explained by specific examples:

1. The case where the pattern of the laser grooving unit 9 in each laser grooving area is the same:

1.1 The same group of laser slotting units 9 have the same pattern

1.1.1 As shown in Figure 7, each laser grooving area is provided with a group of laser grooving units 9, the laser grooving unit 9 is a continuous strip rectangle, and the length of the laser grooving unit 9 is the same as the length of the aluminum grid line; or The length of the laser slotting unit 9 is 0.01-5mm shorter than the length of the aluminum grid line; or the length of the laser slotting unit 9 is 0.01-5mm longer than the length of the aluminum grid line.

1.1.2 As shown in Figure 8, each laser grooving area is equipped with 2 or more sets of laser grooving units 9 (the example in the figure is 3 groups), each group of laser grooving units is arranged in parallel, and two adjacent groups of laser grooving units The pitch between cell units is 5-480 μm. The laser slotting unit 9 is a continuous strip rectangle, the length of the laser slotting unit 9 is the same as the length of the aluminum grid line; or the length of the laser slotting unit 9 is 0.01-5mm shorter than the length of the aluminum grid line; or the laser slotting unit 9 The length is 0.01-5mm longer than the length of the aluminum grid wire.

1.1.3 As shown in Figure 9, each laser grooving area is provided with a group of laser grooving units 9, and the laser grooving units 9 are arranged at intervals along the extending direction of the aluminum grid lines, and the patterns of the same group of laser grooving units 9 can be circular , oval, triangle, quadrilateral, pentagon, hexagon, cross or star, the example in the picture is a rectangle.

1.1.4 As shown in Figure 10, each laser grooving area is equipped with 2 or more groups of laser grooving units 9 (the example in the figure is 3 groups), each group of laser grooving units is arranged in parallel, and two adjacent groups of laser grooving units The pitch between cell units is 5-480 μm. The laser grooving units 9 are arranged at intervals, and the pattern of the laser grooving units 9 can be circular, elliptical, triangular, quadrilateral, pentagonal, hexagonal, cross or star, and the example in the figure is a rectangle.

1.2 The pattern of the laser groove unit 9 in the same group is different

1.2.1 As shown in Figure 11, each laser grooving area is provided with a set of laser grooving units 9, the laser grooving units 9 are arranged at intervals, and the patterns of the laser grooving units 9 can be circular, elliptical, triangular, or quadrilateral , Pentagon, hexagon, cross or star, the pattern of the laser slotting unit 9 is not exactly the same.

1.2.2 As shown in Figure 12, each laser grooving area is provided with 2 or more sets of laser grooving units 9, the laser grooving units 9 are arranged at intervals along the extending direction of the aluminum grid lines, and the pattern of the laser grooving units 9 can be Continuous long line segments, circles, ellipses, triangles, quadrangles, pentagons, hexagons, crosses or stars, the arrangement of the laser grooving units 9 in different groups of laser grooving units 9 is partly or completely different, as shown in Fig. The example in the figure is the case where all the laser grooving units 9 in different groups are different.

2. The pattern of the laser grooving unit 9 in different laser grooving areas is not exactly the same:

In the above Figures 7-12, a single laser slotting area is combined, as shown in Figure 13, or except that the laser slotting unit 9 is a continuous long line segment, 1.1.1-1.1.4 and 1.2.1-1.2.2 In one of the cases, different arrangements are made for different laser grooved regions.

It should be noted that the distance between the laser grooved regions in the above different cases may be the same or different. The distance between two adjacent laser groove units 9 in the same group of laser groove units 9 is 0.01-50 mm, and the distance between the laser groove units 9 in the same group can be the same or different.

The width of the laser grooved area in the utility model is 10-500 μm; the width of the aluminum grid line 2 located below the laser grooved area is larger than the width of the laser grooved area, and the width of the aluminum grid line 2 is 30-550 μm. Select a larger value such as 500 μm for the width of the above-mentioned aluminum grid line 2, and select a smaller value such as 40 μm for the width of the laser grooved area, so that multiple groups of laser grooved areas can be arranged side by side on the same aluminum grid line 2 to ensure that the aluminum grid line 2 and P-type silicon 5 have sufficient contact area.

In summary, the P-type double-sided solar cell described in the present invention is provided with a plurality of aluminum grid lines 2 arranged in parallel, which not only replaces the all-aluminum back electric field in the existing single-sided solar cell to realize back light absorption, but also is used for the back silver electrode The sub-gate structure in is used to conduct electrons. The production of the P-type double-sided solar cell described in the utility model can save the amount of silver paste and aluminum paste, reduce production costs, and realize double-sided absorption of light energy, significantly expand the application range of solar cells and improve photoelectric conversion efficiency.

What is disclosed above is only a preferred embodiment of the utility model, and of course it cannot limit the scope of rights of the utility model. Therefore, the equivalent changes made according to the claims of the utility model are still covered by the utility model. scope.

Claims (10)

1. a kind of double-sided solar electricity generation system waterborne, it is characterised in that including double-sided solar battery assembly array, carriage support System, collective optics and floating support thing, the floating support thing can make double-sided solar battery assembly array, mounting system and Collective optics is swum on the water surface；The mounting system is on floating support thing, the double-sided solar battery assembly array It is supported in the mounting system；Below double-sided solar battery assembly array, it is used for the water surface collective optics The sunshine of reflection is by refraction and/or reflecting focal to the back side of the double-sided solar battery assembly array.

2. double-sided solar electricity generation system waterborne as claimed in claim 1, it is characterised in that the collective optics is located at double Reflective mirror immediately below the solar cell module array of face on different height, it is used in water-reflected to the reflective mirror Sunlight passes through reflecting focal again to the back side of the double-sided solar battery assembly array.

3. double-sided solar electricity generation system waterborne as claimed in claim 1, it is characterised in that the collective optics is located at double Completely reflecting mirror immediately below the solar cell module array of face on different height, it is used for the sunlight by water-reflected according to incidence Angle converges to the back side of the double-sided solar battery assembly array by reflecting or reflecting.

4. double-sided solar electricity generation system waterborne as claimed in claim 1, it is characterised in that the mounting system includes support And angle adjusting mechanism, the angle adjusting mechanism can drive double-sided solar battery assembly array to overturn, make the two-sided sun The front of energy cell array module obtains maximum sun light direct beam.

5. double-sided solar electricity generation system waterborne as claimed in claim 1, it is characterised in that the floating support thing be ship or Artificial floating platform.

6. double-sided solar electricity generation system waterborne as claimed in claim 1, it is characterised in that the double-sided solar battery group Part array is p-type double-sided solar battery assembly array or N-type double-sided solar battery assembly array.

7. double-sided solar electricity generation system waterborne as claimed in claim 1, it is characterised in that the solar cell module battle array P-type double-sided solar battery assembly array is classified as, it includes the p-type double-sided solar battery of array setting, and the p-type is two-sided too Positive energy battery includes carrying on the back silver-colored main grid, alum gate line, back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter stage, front nitrogen SiClx film and positive silver electrode；The back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter stage, front side silicon nitride film and Positive silver electrode stacks gradually connection from bottom to up；

The back side silicon nitride and backside oxide aluminium film form the 30-500 laser be arrangeding in parallel after lbg and opened Groove area, at least 1 group of lbg unit is set in each lbg area, and the alum gate line passes through lbg area and P-type silicon It is connected；The alum gate line is with carrying on the back silver-colored main grid vertical connection.

8. double-sided solar electricity generation system waterborne as claimed in claim 7, it is characterised in that set when in each lbg area When putting 2 groups or more than 2 groups lbg units, each group lbg unit be arranged in parallel, two adjacent groups lbg unit it Between spacing be 5-480 μm.

9. double-sided solar electricity generation system waterborne as claimed in claim 8, it is characterised in that every group of lbg unit includes At least one lbg unit, the pattern of lbg unit is circle, ellipse, triangle, quadrangle, pentagon, six sides Shape, cross or star.

10. double-sided solar electricity generation system waterborne as claimed in claim 9, it is characterised in that every group of lbg unit bag It is the rectangular lbg unit of strip to include a pattern；Arranged with group lbg unit along alum gate line bearing of trend compartment Cloth, the spacing distance of two neighboring lbg unit is 0.01-50mm；The silver-colored main grid of the back of the body is continuous straight grid；Or the back of the body Silver-colored main grid is set in space segmentation；Or the silver-colored main grid of the back of the body is set in space segmentation, is connected between each adjacent sectional by connected region Connect.