CN105405906A - Double-sided power-generating photovoltaic assembly - Google Patents

Abstract

The invention discloses a double-sided power generation photovoltaic module, comprising a laminated board, the laminated board includes a glass layer stacked from top to bottom, a first EVA layer, a battery pack layer, a second EVA layer and a back plate layer; the battery pack layer It is composed of multiple battery strings, and multiple battery strings are arranged in a horizontal array. Each battery string is composed of a plurality of battery slices in series, and the battery slices are connected by wires. The battery slices are double-sided power generation battery slices; the backplane layer is made of transparent materials; it also includes several optimizers, each An optimizer is connected to a string of battery layers, and adjusts the output current or voltage of each string of battery slices to make the output current of each string of battery strings consistent, and several optimizers realize the current summary output through wires.

Description

A double-sided power generation photovoltaic module

technical field

The invention relates to the technical field of photovoltaic modules, in particular to a double-sided power generation photovoltaic module.

Background technique

With the continuous development of photovoltaic module technology, the application of photovoltaic power generation has become increasingly popular and developed rapidly, and has gradually become an important source of power supply. Photovoltaic modules can convert light energy into electrical energy under sunlight to realize photovoltaic power generation.

At present, photovoltaic modules use a large number of solar cells connected to form solar cell strings, which are packaged and then connected to a junction box, which is an interface for outputting current. It mainly converts light energy into electrical energy through solar cells, so the intensity of sunlight directly affects the output of current. In order to solve this problem, the existing photovoltaic modules not only use double-sided panels, but also use reflective equipment to irradiate sunlight to the back of the solar cells, effectively improving the power generation efficiency.

For example, Chinese patent (CN203660980U) discloses a double-sided power generation photovoltaic module with a reflector, including a frame and a solar cell panel, the solar cell panel is a double-sided cell panel for double-sided power generation, and a solar cell panel and a frame bottom plate are provided. There is a reflector, and a card slot is arranged on the inner side of the frame, and the reflector is arranged in the card slot.

Light is irradiated on the front of the solar panel to generate current, and the light is reflected by the reflector to the back of the solar panel to generate current, making full use of light resources to greatly improve the power generation efficiency. Due to the uneven light, there will be differences in the current generated by the solar panels. If the output of each solar panel is connected in series, it will cause a current mismatch and reduce the efficiency.

Contents of the invention

The main purpose of the present invention is to provide a photovoltaic module that is reliable, simple in structure and realizes double-sided power generation, and can be widely used in daily life.

Another object of the present invention is to provide a double-sided power generation photovoltaic module, in which by adjusting the voltage or current of each battery string, the output current of each battery string is consistent, preventing current mismatch, and improving the light energy conversion rate .

In order to achieve the above object, the present invention provides a double-sided power generation photovoltaic module, which includes: a laminated board, which includes a glass layer stacked from top to bottom, a first EVA layer, a battery pack layer, a second EVA layer and backplane layer;

The battery pack layer is composed of a plurality of battery strings arranged in a horizontal array; each of the battery strings is U-shaped and consists of a plurality of battery slices in series, and the battery slices are connected in series. Through the wire connection, the current summary output is realized, and the battery slice is a double-sided power generation battery slice;

The backplane layer is made of a transparent material;

It also includes a number of optimizers, each of which is connected to a string of battery pack layers, specifically, the optimizer is connected to the first and last ends of each string of battery pack layers, and adjusts the Output current or voltage, so that the current output by each battery string is consistent, and several optimizers realize the current summary output through wires.

Wherein, the battery sheet is a square silicon material battery, the outer surface is covered with a layer of anti-reflection protective film, and the two battery sheets are connected by wires made of silver to realize the current summary output.

Correspondingly, a frame is also included, and the frame is used for fixing the laminated board and is arranged at a peripheral position of the laminated board.

Correspondingly, a junction box is also included, the junction box is arranged on the backplane layer, the junction box is provided with an installation slot for placing the optimizer, and the optimizer is fixed in the installation slot. Correspondingly, the wires at the first and last ends of each battery string pass through the backplane to connect to the optimizer.

Preferably, the junction box is made of waterproof material, such as plastic. Since the optimizer needs to dissipate heat, the function of dissipating heat is realized by increasing the volume of the junction box and setting a plurality of ventilation holes.

In one embodiment, the backsheet layer is a backsheet layer made of PEO (polyethylene oxide) or PET (polyethylene terephthalate) material. The thickness of the back plate is 0.2-0.4 microns.

Preferably, an EVA adhesive layer and a fluorine-containing film layer are respectively provided on the upper and lower surfaces of the backsheet layer, and the EVA adhesive layer is adjacent to the second EVA layer. The thicknesses of the EVA adhesive layer and the fluorine-containing film layer are both less than 0.1 micron, and the thickness of the stacked EVA adhesive layer, the back plate and the fluorine-containing film layer is about 0.5 micron.

In one embodiment, the upper surface of the glass layer is coated with a layer of silicon dioxide.

In one embodiment, the glass layer is a glass layer made of patterned tempered glass material.

Preferably, the number of the battery strings is 3 strings, that is, the number of the optimizers is also 3.

Due to the adoption of the above technology, the double-sided power generation photovoltaic module of the present invention is compared with the prior art. More solar energy is converted into photoelectric current, so that the power generation efficiency is greatly improved. By setting the optimizer and adjusting the voltage or current of the cells, the output photocurrent of each cell string can be adjusted to match and reduce losses.

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

Description of drawings

Fig. 1 is the structural representation of laminated board of the present invention;

Fig. 2 is a schematic structural diagram of the connection between the battery pack layer and the optimizer according to the present invention.

reference sign

1 laminate

2 layers of glass

3 first EVA layer

4 battery pack layers

5 second EVA layer

6 backplane layers

7 optimizer

8 cells

9 wires

10 battery strings.

detailed description

The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present invention.

As shown in Figures 1 and 2, the double-sided power generation photovoltaic module includes: a laminated board 1 and a frame, the frame is used to fix the laminated board 1, and is arranged at the peripheral position of the laminated board 1, and the laminated board 1 includes from top to bottom laminated glass layer 2, first EVA layer 3, battery pack layer 4, second EVA layer 5 and backsheet layer 6;

The battery pack layer 4 is composed of a plurality of battery strings 10 arranged in a horizontal array, each battery string 10 is U-shaped, and is composed of a plurality of battery slices 8 in series, and the battery slices 8 are connected by wires. 9 connections, the cell 8 is a cell for double-sided power generation;

The backplane layer 6 is made of a transparent material. Specifically, the backplane layer 6 is a backplane layer made of PEO or PET material;

It also includes a number of optimizers 7, each optimizer 7 is connected to a string of battery pack layers 10, and adjusts the output current or voltage of each string of battery slices 8, so that the output current of each string of battery strings 10 is consistent, and several optimizers 7 The current summary output is realized through the wire 9 .

Wherein, the optimizer 7 adjusts the output current and voltage of each string of battery slices 8 so that the output current of each string of battery slices 8 is consistent. for example:

There are currently three battery strings, the total power of the photovoltaic modules is 240W, the input power of each battery string is 80W, the input voltage is 10V, and the input current is 8A. If a solar cell in one of the battery strings cannot be irradiated with sunlight, the current of the battery string is 0 without using the optimizer, so the total output power P of the photovoltaic module is 160W.

In the case of using the optimizer, the optimizer adjusts the voltage and current of each battery string to make the output current of each battery string consistent. Specifically, the input current of the battery string is 4A, and the input voltage is 11V, so that the output current is 8A. Since the input power is equal to the output power, the output voltage is 5.5V, that is, the total output power of the photovoltaic module is P=5.5X8+10X8+10X8=204W.

The battery sheet 8 is a double-sided battery sheet. When the front of the battery sheet 8 is irradiated by sunlight to generate current, since the back plate layer 6 is made of a transparent material, the backside of the battery sheet 8 is irradiated by reflected sunlight. current. Use the installation site to achieve reflection, such as the ground, etc. At the same time, a reflective device can also be added to reflect sunlight to the back of the battery sheet.

Correspondingly, a junction box is also included, the junction box is arranged on the backplane layer, the junction box is provided with an installation groove for placing the optimizer, and the optimizer is fixed in the installation groove. Correspondingly, the wires at the first and last ends of each battery string pass through the backplane to connect to the optimizer.

Wherein, the junction box is made of waterproof material, such as plastic. Since the optimizer needs heat dissipation, the effect of heat dissipation is achieved by increasing the volume of the junction box and setting multiple ventilation holes.

Wherein, the frame is a frame made of anodized aluminum profile, or may be a plastic frame, or the peripheral position of the laminated board is directly sealed with an adhesive tape.

Among them, the glass layer 2 adopts ultra-clear low-iron embossed tempered glass. By using the embossed pattern, the specular reflection of sunlight can be effectively avoided, the transmittance of sunlight can be increased, the use efficiency can be effectively improved, and the power generation capacity of the cell can be enhanced.

Correspondingly, the upper surface of the glass layer 2 is coated with a layer of silicon dioxide. Further increase the transmittance of sunlight and reduce the energy loss caused by reflected light.

Wherein, the upper and lower surfaces of the back sheet layer 6 are respectively provided with an EVA bonding layer and a fluorine-containing film layer, and the EVA bonding layer is adjacent to the second EVA layer.

The thickness of the back plate layer 6 is 0.2-0.4 micron, which is used to block the entry of water vapor. The upper and lower surfaces of the back sheet layer 6 are respectively pasted with fluorine-containing fluorocarbon films, the thickness of which is less than 0.1 micron, which is used to prevent the erosion of the PET material by the ultraviolet rays of the sun's rays and to block the entry of water vapor.

Due to the uneven irradiation of sunlight, the current generated by each cell is different. Since each string of battery strings is connected in series, once a cell cannot be irradiated with sunlight, the current of the entire string of battery strings will be affected. At this time, the optimizer adjusts the current and voltage of each string of battery strings, and automatically adjusts the output current of each string of battery strings while keeping the total output energy unchanged to achieve consistent regulation, thereby avoiding power loss .

According to said preferred embodiment, the present invention also provides the following advantages:

(1) The structure is simple and reliable;

(2) The present invention adopts double-sided power generation cells to realize double-sided power generation, and cooperates with the back plate made of transparent materials to convert more solar energy into photocurrent, greatly improving power generation efficiency.

(3) The present invention uses an optimizer to adjust the voltage or current of the battery slices, so that the output current of each string of battery strings is consistent, thereby avoiding power loss.

(4) The present invention has a junction box on which the optimizer is fixed to protect the optimizer and effectively prolong the service life.

The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and the scope of the present invention cannot be limited only by this embodiment. The adoption of the scope of the patent, that is, all equivalent changes or modifications made according to the spirit disclosed in the present invention still fall within the scope of the patent of the present invention.

Claims (8)

1. A double-sided power generation photovoltaic module, comprising a laminate (1), the laminate (1) comprising a stacked glass layer (2), the first EVA layer (3), a battery pack layer ( 4), the second EVA layer (5) and the backboard layer (6), are characterized in that: The battery pack layer (4) is composed of a plurality of battery strings (10), and the plurality of battery strings (10) are arranged in a horizontal array, and each of the battery strings (10) is U-shaped, and consists of multiple The battery slices (8) are connected in series, and the battery slices (8) are connected by wires (9), and the battery slices (8) are double-sided power generating battery slices; The backboard layer (6) is made of a transparent material; It also includes several optimizers (7), each of which is connected to a string of battery pack layers (10), and adjusts the output current or voltage of each string of battery slices (8), so that each string The currents output by the battery strings (10) are consistent, and the several optimizers (7) realize the aggregated current output through the wires (9). 2. The double-sided power generation photovoltaic module according to claim 1, characterized in that: the back sheet layer (6) is a back sheet layer made of PEO or PET material. 3. The double-sided power generation photovoltaic module according to claim 1, characterized in that: the glass layer (2) is a glass layer made of embossed tempered glass material. 4. The double-sided power generation photovoltaic module according to claim 1, characterized in that: the upper surface of the glass layer (2) is coated with a layer of silicon dioxide. 5. The double-sided power generation photovoltaic module according to claim 1, characterized in that: the upper and lower surfaces of the back plate layer (6) are respectively provided with an EVA adhesive layer and a fluorine-containing film layer, and the EVA adhesive layer layer is adjacent to the second EVA layer. 6. The double-sided power generation photovoltaic module according to claim 1, characterized in that: it also includes a junction box, the junction box is arranged on the back plate layer (6), and the junction box is provided with Place the installation groove of the optimizer (7), and the optimizer 7 is fixed in the installation groove. 7. The double-sided power generation photovoltaic module according to claim 1, characterized in that: the thickness of the back plate layer (6) is 0.2-0.4 microns. 8. The double-sided power generation photovoltaic module according to claim 1, characterized in that: it also includes a frame, the frame is used to fix the laminate (1), and is arranged on the laminate (1) surrounding location.