Multi-output photovoltaic module and vertical surface photovoltaic power generation device thereof

Abstract

The utility model discloses a multi-path output photovoltaic assembly and a vertical surface photovoltaic power generation device thereof, a plurality of battery pieces in the multi-path output photovoltaic assembly are arranged into at least two rows, each row of battery pieces form a corresponding battery piece string which is mutually insulated and packaged into a strip shape, and a positive output connecting line and a negative output connecting line are respectively led out from each battery piece string. A plurality of multi-path output photovoltaic modules are obliquely arranged and are mounted on the vertical rails at intervals in the vertical direction through respective supporting strips and corresponding module supporting seats, and battery piece strings, located at the same position in the width direction, on the multi-path output photovoltaic modules are electrically connected with one another through output connecting wires of the battery piece strings to form a battery pack string; and the MPPT modules are respectively connected to different inverters or connected to different MPPT input ends on the same inverter. By adopting the multi-path output photovoltaic assembly and the vertical surface photovoltaic power generation device thereof, the influence of the upper row of photovoltaic assemblies on the power generation efficiency after the lower row of photovoltaic assemblies are shaded can be well reduced, and the power generation capacity is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a photovoltaic power generation device, especially to a photovoltaic module and a distributed photovoltaic power generation device installed on a vertical wall surface and composed of the photovoltaic module. BACKGROUND

[0002] The distributed photovoltaic power generation device is a photovoltaic power generation facility constructed and operated at a user's site or nearby, and is suitable for buildings, roofs, walls and other sites to make full use of the surface resources of the buildings. In order to obtain a relatively ideal power generation efficiency, the light-receiving surface of the photovoltaic module in the photovoltaic power generation device must form a certain angle with the horizontal plane so that the light-receiving surface of the photovoltaic module is perpendicular to the sunlight as much as possible. On the wall surface of the building, considering that the photovoltaic module installed with an angle will extend too much from the wall surface, which will not only affect the appearance but also bring many other problems such as inconvenience in installation and heavy load on the wall, it is difficult for the photovoltaic module to form an ideal installation angle. On the other hand, the installation of the photovoltaic module on the wall surface of the building naturally requires the photovoltaic module to be arranged in an up-down manner along the wall surface, which brings another problem that the photovoltaic module in the upper row will cause a long-term and large-area shadow on the side of the photovoltaic module in the lower row close to the wall, especially during the time period before and after noon. Even if the distance between the photovoltaic modules in the upper and lower rows is increased, the shadow cannot be avoided. Once the sunlight is blocked, the part of the photovoltaic module close to the wall cannot generate electricity normally. If there is only one row of battery pieces in the photovoltaic module installed on the wall surface, the power generation capacity of the entire photovoltaic module will decrease significantly after being shaded. If there are more than two rows of battery pieces in the photovoltaic module, bypass diodes will be arranged between the rows of battery pieces to prevent the shaded battery pieces from affecting the power generation capacity of the unshaded battery pieces. When the photovoltaic module in the lower row is shaded and the photovoltaic module in the upper row is normally illuminated, the photovoltaic module will short-circuit the row of battery pieces with low power generation capacity through the bypass diode, and the power generation capacity of the photovoltaic module will also decrease significantly. Therefore, the photovoltaic power generation device installed on the wall is mostly installed vertically with the photovoltaic module attached to the wall surface. However, in this case, there will be a large angle between the sunlight and the light-receiving surface of the photovoltaic module, which will result in low power generation efficiency and poor economic benefits. SUMMARY

[0003] In view of the above problems in the prior art, the technical problem to be solved by the utility model is to provide a multi-output photovoltaic module and a vertical surface photovoltaic power generation device, which can better reduce the influence of the upper row of photovoltaic modules on the power generation efficiency of the lower row of photovoltaic modules after being shaded and improve the power generation capacity.

[0004] In order to solve the above technical problems, the utility model discloses a kind of multi-output photovoltaic modules, including several cell pieces, the several cell pieces are arranged into at least two rows, each cell piece in same row is mutually electrically connected to constitute a cell piece string, each cell piece string is located between upper layer EVA and lower layer EVA and is encapsulated into long strip cell piece package body by the most upper layer flexible light-transmitting panel and the most lower layer back plate, each cell piece string is mutually insulated, every cell piece string leads out two output connecting lines respectively, the two output connecting lines are a positive output connecting line and a negative output connecting line respectively, the output connecting line passes through flexible light-transmitting panel or back plate and extends outside cell piece package body.

[0005] Preferably, the cell piece is a whole piece of crystalline silicon photovoltaic cell or a 1 / 2 piece or a 1 / 4 piece, the 1 / 2 piece is obtained by cutting a whole piece of crystalline silicon photovoltaic cell into two halves along one edge length direction, and the 1 / 4 piece is obtained by cutting the 1 / 2 piece again along the length direction.

[0006] Preferably, the aspect ratio a:b of each cell piece string is 4:1-30:1.

[0007] Preferably, a junction box is arranged on the flexible light-transmitting panel or the back plate, the number of the junction box corresponds to the number of cell piece strings, and the output connecting line extends outside the cell piece package body through the junction box.

[0008] Preferably, a connector is arranged at the end of the output connecting line, and the connectors on the positive output connecting line and the negative output connecting line can be plugged into each other.

[0009] A vertical surface photovoltaic power generation device includes a photovoltaic module and an inverter, the photovoltaic module includes a multi-output photovoltaic module, a bracket is attached to the back of the multi-output photovoltaic module, a plurality of multi-output photovoltaic modules are installed on vertical rails in the up-down direction through the brackets and corresponding module support seats, and the light-receiving surface of the multi-output photovoltaic module is arranged obliquely relative to the horizontal plane; except for the uppermost multi-output photovoltaic module, the cell piece strings at the same position in the width direction of each multi-output photovoltaic module are electrically connected to each other through the output connecting lines to form a cell group string, and each cell group string formed by each multi-output photovoltaic module is connected to different inverters or different MPPT input ends of the same inverter.

[0010] Preferably, the angle α between the light-receiving surface of the obliquely arranged multi-output photovoltaic module and the horizontal plane is 40°-70°.

[0011] Preferably, a plurality of vertical rails are arranged in the left-right direction, and a plurality of multi-output photovoltaic modules are arranged in the up-down direction between each pair of adjacent vertical rails.

[0012] Preferably, each cell string in the uppermost multi-output photovoltaic module is connected to the cell string on the outermost side in the width direction in each of the remaining multi-output photovoltaic modules through a respective output connecting line.

[0013] After the above technical solution, the multi-output photovoltaic module no longer outputs the total generated power as a whole, but outputs the generated power of each row of cell strings distributed in the width direction through a respective output connecting line. The junction box corresponding to the output connecting line and the connector at the end of the output connecting line ensure the convenience of independent output of the generated power. When the photovoltaic modules are arranged in an up-down manner, the cell strings not affected by shading will generate power normally, and the cell strings affected by shading can also output the generated power, which can maximize the power generation capacity of the photovoltaic module and output the generated power of the photovoltaic module. At the same time, the multi-output photovoltaic module is packaged into a long strip by a flexible light-transmitting panel, and no module frame is provided. Compared with the conventional glass panel photovoltaic module, the weight of the multi-output photovoltaic module is very light, the part extending out of the wall surface is short, the load on the wall is small, and the installation process is convenient and labor-saving.

[0014] The multi-output photovoltaic module is arranged in an up-down and left-right manner on the vertical wall surface to form a vertical surface photovoltaic power generation device. The device can maximize the power generation capacity of the photovoltaic module, and the cell strings in the same position in the width direction of each multi-output photovoltaic module except the uppermost multi-output photovoltaic module are connected to the MPPT input end of the same inverter or different inverters, which eliminates the problem of low inverter conversion efficiency caused by the input of cell strings in different positions in the width direction of the inclined multi-output photovoltaic module arranged in an up-down manner into the same inverter MPPT channel. The cell strings in different positions in the width direction can be tracked by the corresponding MPPT controller to maximize the output of the generated power, thereby efficiently converting the generated power of the photovoltaic module and effectively improving the power generation efficiency of the photovoltaic power generation device.

[0015] The cell strings in the uppermost multi-output photovoltaic module are not shaded by the photovoltaic module above, and the light conditions are the same as those of the cell strings on the outermost side in the width direction of the remaining multi-output photovoltaic modules. Therefore, the cell strings in the uppermost multi-output photovoltaic module are connected to the cell strings on the outermost side in the width direction of the remaining multi-output photovoltaic modules through a respective output connecting line, which can maximize the power generation capacity of the uppermost photovoltaic module and further improve the power generation capacity of the photovoltaic power generation device. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model discloses a multi-output photovoltaic module and vertical surface photovoltaic power generation device, which is further described in detail below with reference to the drawings and specific embodiments.

[0017] Figure 1 It is a mechanical structure schematic diagram of one specific embodiment of the utility model multi-output photovoltaic module and vertical surface photovoltaic power generation device.

[0018] Figure 2 It is Figure 1 The right side view of the structure shown.

[0019] Figure 3 It is Figure 1 The structure schematic diagram of the multi-output photovoltaic module in the structure shown.

[0020] Figure 4 It is Figure 1 The schematic diagram of one electrical connection specific embodiment of the utility model multi-output photovoltaic module and vertical surface photovoltaic power generation device.

[0021] In the figure: 1-multi-output photovoltaic module, 11-output connecting line, 12-junction box, 13-battery piece encapsulation, 14-battery piece, 15-battery piece string, 16-connector, 2-module support seat, 3-vertical stand rail, 4-supporting strip, 5-inverter, 6-battery group string. Specific embodiment

[0022] In Figure 1 And Figure 2 The utility model multi-output photovoltaic module and vertical surface photovoltaic power generation device, the long strip-shaped multi-output photovoltaic module 1 is installed on the vertical stand rail 3 through the two supporting strips 4 of its back surface adhesion and the corresponding module support seat 2, and the two supporting strips 4 extend from both ends of the multi-output photovoltaic module 1 as shown in Figure 3 The multi-output photovoltaic module 1 can be connected through the plug-in connection or the fastener installation connection of the two supporting strip 4 extension parts and the corresponding module support seat 2, the module support seat 2 is fixedly connected to the corresponding vertical stand rail 3, a plurality of vertical stand rails 3 are arranged along the left-right direction, and a plurality of multi-output photovoltaic modules 1 are arranged along the up-down direction between each adjacent two vertical stand rails 3, the light receiving surface of the multi-output photovoltaic module 1 is arranged obliquely relative to the horizontal plane, and the included angle α between the light receiving surface of the obliquely arranged multi-output photovoltaic module 1 and the horizontal plane is 40°-70°, and the included angle value is preferably determined according to the latitude of the photovoltaic power generation device installation site, so as to maximize the annual power generation of the photovoltaic power generation device.

[0023] The structure of the multi-output photovoltaic module 1 is as shown in Figure 3As shown, several solar cells 14 are arranged in at least two rows. Solar cells 14 are whole crystalline silicon photovoltaic cells, half-cut cells, or quarter-cut cells. The half-cut cells are formed by cutting a whole crystalline silicon photovoltaic cell into two halves along one side. The quarter-cut cells are formed by cutting the half-cut cells again along their length. Preferably, quarter-cut cells are arranged in two rows. Solar cells 14 in the same row are electrically connected to form a solar cell string 15. The number of solar cells 14 in each solar cell string 15 varies depending on the installation site, resulting in an aspect ratio (a:b) of 4:1 to 30:1 for each solar cell string 15. Each solar cell string 15 is located between the upper and lower EVA layers and passes through the uppermost layer. The flexible light-transmitting panel and the bottommost backplate are laminated and encapsulated into a strip-shaped battery cell package 13. Each battery cell string 15 is insulated from the others. Each battery cell string 15 has two output connection lines 11, one positive and one negative. The output connection lines 11 pass through the flexible light-transmitting panel or backplate and extend beyond the battery cell package 13 through junction boxes 12 provided on the flexible light-transmitting panel or backplate. The number of junction boxes 12 corresponds to the number of battery cell strings 15 and is sealed and bonded to the flexible light-transmitting panel or backplate. The figure shows four junction boxes 12, with two corresponding to each battery cell string 15; that is, each output connection line 11 is equipped with one junction box 12. (See figure). Figure 4 A connector 16 is provided at the end of the output connection line 11 led out through the junction box 12. The connectors 16 on the positive output connection line and the negative output connection line can be plugged into each other and make the positive output connection line and the negative output connection line electrically connected.

[0024] like Figure 4 As shown, except for the top multi-output photovoltaic module 1, the cell strings 15 on each multi-output photovoltaic module 1, positioned at the same width, are electrically connected to each other via their output connection lines 11 to form a battery string 6. Each battery string 6 formed by the multi-output photovoltaic modules 1 is connected to a different inverter 5. In the case of a small photovoltaic power generation device with only one inverter, each battery string 6 is connected to a different MPPT input terminal on the same inverter 5. For the top multi-output photovoltaic module, the wiring depends on the installation site conditions. If the top multi-output photovoltaic module 1 is not shaded, then each cell string 15 within it is connected via its respective output connection line 11 to the outermost battery string 6 in the width direction of the other multi-output photovoltaic modules 1, as shown in the wiring diagram. Figure 4 As shown; if the top multi-output photovoltaic module 1 may be partially shaded during certain periods due to the presence of eaves or other objects above it, just like the bottom multi-output photovoltaic module 1, then all the cell strings 15 of each multi-output photovoltaic module 1 that are in the same position in the width direction are electrically connected to each other through their output connection lines 11 to form their respective cell strings 6.

[0025] The above only lists some preferred embodiments of the present application, but the present application is not limited thereto, and many improvements and changes can be made. As long as the improvements and changes are made on the basis of the basic principles of the present application, they should be considered to fall within the scope of protection of the present application.

Claims

1. A multiple output photovoltaic module comprising a plurality of cells (14), characterized in that: The several battery pieces (14) are arranged into at least two rows, the battery pieces (14) in the same row are electrically connected to each other to form a battery piece string (15), each battery piece string (15) is located between the upper EVA and the lower EVA and is encapsulated into a long strip-shaped battery piece encapsulation (13) through the uppermost flexible light-transmitting panel and the lowermost back plate, the battery piece strings (15) are insulated from each other, and each battery piece string (15) leads out two output connecting lines (11), which are a positive output connecting line and a negative output connecting line respectively, and the output connecting lines (11) extend out of the battery piece encapsulation (13) through the flexible light-transmitting panel or the back plate.

2. The multiple-output photovoltaic assembly of claim 1, wherein: The battery piece (14) is a whole piece or a 1 / 2 piece or a 1 / 4 piece of a crystalline silicon photovoltaic cell, the 1 / 2 piece is obtained by cutting a whole piece of the crystalline silicon photovoltaic cell into two halves along one edge length direction, and the 1 / 4 piece is obtained by cutting the 1 / 2 piece once again along the length direction.

3. The multiple-output photovoltaic assembly of claim 1 or 2, wherein: The length-width ratio a:b of each battery piece string (15) is 4:1-30:

1.

4. The multiple-output photovoltaic assembly of claim 1, wherein: A junction box (12) is arranged on the flexible light-transmitting panel or the back plate, the number of the junction boxes (12) corresponds to the number of the battery piece strings (15), and the output connecting lines (11) extend out of the battery piece encapsulation (13) through the junction boxes (12).

5. The multiple-output photovoltaic assembly of claim 1 or 4, wherein: The output connecting lines (11) are provided with connectors (16) at the ends, and the connectors (16) on the positive output connecting lines and the negative output connecting lines can be plugged into each other.

6. A building integrated photovoltaic power generation device comprising a photovoltaic module and an inverter, characterized by: The photovoltaic module is a multi-output photovoltaic module (1) as claimed in any one of claims 1-5, a back strip (4) is attached to the back of the multi-output photovoltaic module (1), and a plurality of multi-output photovoltaic modules (1) are installed on vertical rails (3) in the up-down direction through the respective back strips (4) and corresponding module support seats (2), and the light-receiving surface of the multi-output photovoltaic module (1) is arranged to be inclined relative to the horizontal plane; except for the uppermost multi-output photovoltaic module (1), the battery piece strings (15) at the same position in the width direction of each multi-output photovoltaic module (1) are electrically connected to each other through the output connecting lines (11) to form a battery string (6), and each battery string (6) formed by the multi-output photovoltaic module (1) is connected to different inverters (5) or to different MPPT input ends of the same inverter (5).

7. The vertical facade photovoltaic power installation according to claim 6, characterized in that: The included angle α between the light-receiving surface of the inclined multi-output photovoltaic module (1) and the horizontal plane is 40°-70°.

8. The vertical facade photovoltaic power installation according to claim 6, characterized in that: A plurality of vertical rails (3) are arranged in the left-right direction, and a plurality of multi-output photovoltaic modules (1) are arranged in the up-down direction between each two adjacent vertical rails (3).

9. The vertical facade photovoltaic power installation according to claim 6 or 8, characterized in that: Each battery piece string (15) in the uppermost multi-output photovoltaic module (1) is connected to the battery string (6) at the outermost side in the width direction of each of the remaining multi-output photovoltaic modules (1) through the respective output connecting lines (11).

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