Thin film photovoltaic module

Abstract

The utility model discloses a film photovoltaic assembly. The thin film photovoltaic module comprises a plurality of batteries arranged along a first direction, and each battery comprises a first electrode layer, a first charge transfer layer, a power generation function layer, a second charge transfer layer, a second electrode layer and a first conductive wire which are stacked; the battery further comprises an extension part, the extension part and the second electrode layer are integrally formed, and the extension part extends in the thickness direction of the first electrode layer and is in contact connection with the first electrode layer of another battery; the first conductive line is connected to the second electrode layer and extends in a first direction. The power loss when the current passes through the second electrode layer can be reduced, and the output power of the thin film photovoltaic module is improved. And moreover, the cost caused by laser cutting in the manufacturing process of the battery can be reduced, and the influence of depreciation of laser equipment on working procedures is reduced. And meanwhile, the voltage of the thin film photovoltaic module can be reduced, the cost of an inverter in a photovoltaic power generation system can be reduced, and the electric energy cost is further reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of photovoltaic power generation, and in particular to a thin-film photovoltaic module. Background Technology

[0002] Currently, the product structure of glass-based thin-film photovoltaic (PV) modules can include a stacked transparent conductive glass layer, a first charge transport layer, a power generation layer, a second charge transport layer, and a back electrode layer. The transparent electrode material in the transparent conductive glass is typically fluorine-doped tin oxide (FTO) or indium tin oxide (ITO), which has a very high resistivity, generally 100 times that of conventional metals. This results in significant power loss when current passes through the transparent electrode, greatly affecting the power output of the thin-film PV module. For example, the power loss on the transparent electrode under the same transmission path is more than 10 times that on the metal electrode. This also limits the width of the battery bars in the thin-film PV module, increasing the number of battery bars and thus increasing the manufacturing cost. Furthermore, the battery bars in the thin-film PV module are connected in series. When the number of battery bars is large, the voltage of the thin-film PV module is relatively high, increasing the cost of the inverter in the PV power generation system and consequently increasing the cost of electricity. Utility Model Content

[0003] This invention provides a thin-film photovoltaic module to reduce power loss on the electrode layer, thereby reducing the manufacturing cost and electricity cost of the thin-film photovoltaic module.

[0004] In a first aspect, this utility model provides a thin-film photovoltaic module, characterized in that it includes a plurality of cells arranged along a first direction, each cell including a first electrode layer, a first charge transport layer, a power generation functional layer, a second charge transport layer, a second electrode layer, and a first conductive line stacked together; the cell also includes an extension portion, which is integrally formed with the second electrode layer, the extension portion extending along the thickness direction of the first electrode layer and contacting and connecting with the first electrode layer of another cell; the first conductive line is connected to the second electrode layer and extends along the first direction.

[0005] Optionally, the battery further includes at least one second conductive wire, which is disposed in the same layer as the first conductive wire and extends along a second direction; wherein the second direction intersects the first direction.

[0006] Optionally, the battery includes at least two sub-cells arranged along the second direction; in adjacent sub-cells, the second electrode layer of one sub-cell is connected to the first electrode layer of the other sub-cell; each second conductive line includes multiple conductive segments extending along the second direction, and each conductive segment is disposed on the second electrode layer of one sub-cell.

[0007] Optionally, the thickness of the first electrode layer is greater than or equal to 5-15 mm.

[0008] Optionally, each of the batteries includes a plurality of the first conductive lines, which are arranged at equal intervals.

[0009] Optionally, the spacing between adjacent first conductive lines is in the range of 0.5-2 mm.

[0010] Optionally, the width of the first conductive wire is in the range of 0.001-1mm, and the thickness of the first conductive wire is in the range of 0.001-1mm.

[0011] Optionally, the material of the first conductive wire includes a low-temperature conductive adhesive; wherein the low-temperature curing temperature of the low-temperature conductive adhesive is less than or equal to 200°C.

[0012] Optionally, the material of the second electrode layer includes at least one of fluorine-doped tin oxide (FTO), indium tin oxide (ITO), aluminum zinc oxide (AZO), and indium tungsten oxide (IWO).

[0013] The technical solution of this utility model embodiment, by connecting a first conductive line to a second electrode layer and extending the first conductive line along a first direction, makes the first conductive line and the second electrode layer equivalent to a parallel connection. This reduces the equivalent resistance when current flows through the second electrode layer, thereby reducing power loss and increasing the output power of the thin-film photovoltaic module. Furthermore, it reduces the limitation on the width of each cell due to power loss, which helps reduce the number of cells in the thin-film photovoltaic module. This reduces the cost of laser cutting during cell manufacturing and mitigates the impact of laser equipment depreciation on the process. Simultaneously, it lowers the voltage of the thin-film photovoltaic module, which helps reduce the cost of the inverter in the photovoltaic power generation system, thus reducing electricity costs. Attached Figure Description

[0014] Figure 1 A three-dimensional structural schematic diagram of a thin-film photovoltaic module provided for an embodiment of this utility model;

[0015] Figure 2This is a schematic diagram of the cross-sectional structure of a thin-film photovoltaic module obtained by cross-sectioning along a second direction, as provided in an embodiment of the present invention.

[0016] Figure 3 A schematic diagram of current convergence on the second electrode layer in a conventional thin-film photovoltaic module provided as an embodiment of this utility model;

[0017] Figure 4 A method provided for embodiments of this utility model Figure 1 and Figure 2 A schematic diagram of the current busbar on the second electrode layer in the corresponding thin-film photovoltaic module;

[0018] Figure 5 A three-dimensional structural schematic diagram of another thin-film photovoltaic module provided in an embodiment of this utility model;

[0019] Figure 6 This is a top view of a thin-film photovoltaic module provided in an embodiment of the present invention. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of a thin-film photovoltaic module provided in an embodiment of the present invention. Figure 2 This is a schematic cross-sectional view of a thin-film photovoltaic module obtained by cutting along a second direction, as provided in an embodiment of the present invention. The second direction Y intersects with the first direction X. Figure 1 and Figure 2 As shown, the thin-film photovoltaic module includes multiple cells 10 arranged along a first direction X. Each cell 10 includes a first electrode layer 110, a first charge transport layer 120, a power generation layer 130, a second charge transport layer 140, a second electrode layer 150, and a first conductive line 160 stacked together. Each cell 10 also includes an extension 170, which is integrally formed with the second electrode layer 150. The extension 170 extends along the thickness direction Z of the first electrode layer 110 and is in contact with the first electrode layer 110 of another cell 10. The first conductive line 160 is connected to the second electrode layer 150 and extends along the first direction X.

[0022] Specifically, the second electrode layer 150 of the battery 10 can be a transparent electrode material to ensure the transmittance of external light entering the battery 10 from the surface of the second electrode layer 150 away from the second charge transport layer 140. For example, the second electrode layer 150 can be a transparent conductive oxide, such as FTO, ITO, AZO, and IWO. The light then passes through the second electrode layer 150 and the second charge transport layer 140 and reaches the power generation functional layer 130, allowing the power generation functional layer 130 to generate new electron-hole pairs. The direction of the pn junction electric field in the power generation functional layer 130 points towards the p-region. When the direction of the pn junction electric field in the power generation functional layer 130 points towards the second charge transport layer 140, electrons are transported through the first charge transport layer 120 to the first electrode layer 110, and holes are transported through the second charge transport layer 140 to the second electrode layer 150, forming an electric field between the first electrode layer 110 and the second electrode layer 150, thereby creating a certain potential difference between the two electrodes of the battery 10, which is the voltage that the battery 10 can provide. For example, the output voltage of battery 10 can be 1.1V. In this case, the first electrode layer 110 can be the negative electrode of battery 10, and the second electrode layer 150 can be the positive electrode of battery 10. The first charge transport layer 120 is an electron transport layer, and the second charge transport layer 140 is a hole transport layer. In other embodiments, the direction of the pn junction electric field in the power generation functional layer 130 can be set to point towards the first charge transport layer 120. In this case, the transport directions of holes and electrons are reversed, the first electrode layer 110 of battery 10 is the positive electrode of battery 10, the second electrode layer 150 is the negative electrode of battery 10, the first charge transport layer 120 is a hole transport layer, and the second charge transport layer 140 is an electron transport layer. This is not limited here.

[0023] The thin-film photovoltaic module includes multiple cells 10. When forming the multiple cells 10, a first electrode film layer can be formed first. Then, a first groove is formed on the first electrode film layer by laser scribing, disconnecting the first electrode layers 110 corresponding to adjacent cells 10. Next, a first charge transport film layer, a power generation film layer, and a second charge transport film layer are sequentially formed on the first electrode layer 110. Then, a second groove is formed on the first charge transport film layer, power generation film layer, and second charge transport film layer by laser scribing, disconnecting the first charge transport layer 120 corresponding to adjacent cells 10, simultaneously disconnecting the power generation film layer 130 corresponding to adjacent cells 10, and disconnecting the second charge transport layer 140 corresponding to adjacent cells 10. Then, a second electrode layer 150 and an extension 170 are simultaneously formed on the second charge transport layer 140. The extension 170 can be integrally formed, connecting the second electrode layer 150 and the extension 170. Simultaneously, the extension 170 can extend along the thickness direction Z of the first electrode layer 110 to the bottom of the second groove and contact and connect with the first electrode layer 110. This allows the first electrode layer 110 and the second electrode layer 150 to be connected through the extension 170, realizing a series connection between adjacent batteries 10. Moreover, it avoids the need for additional conductive lines, simplifying the process and reducing the difficulty of connecting the batteries 10 in series. Then, a third groove can be formed between adjacent batteries 10 by laser scribing to disconnect the second electrode layer 150 between adjacent batteries 10.

[0024] Figure 1 and Figure 2The illustration exemplarily shows a battery 10 including multiple first conductive lines 160 extending along a first direction X, each first conductive line 160 being disposed on a second electrode layer 150. Exemplarily, the first conductive lines 160 can be disposed on the second electrode layer 150 using processes such as vapor deposition and screen printing. In some embodiments, when the thin-film photovoltaic module further includes an encapsulating film, the encapsulating film covers the second electrode layer 150, and the first conductive lines 160 can be coated copper wires and silver wires integrated with the encapsulating film, coupled to the second electrode layer 150 through lamination. When adjacent batteries 10 are connected in series along the first direction X, the current transmission direction on the second electrode layer 150 is the first direction X, and the transmission distance on the second electrode layer 150 is the width of the battery 10 along the first direction X. At this time, a first conductive line 160 extending along the first direction X is provided on the second electrode layer 150. The first conductive line 160 is connected to the second electrode layer 150, allowing current to pass through it. The first conductive line 160 and the second electrode layer 150 are equivalently connected in parallel, thereby reducing the equivalent resistance when current passes through the second electrode layer 150, thus reducing power loss and improving the output power of the thin-film photovoltaic module. Furthermore, it reduces the limitation on the width of each cell 10 due to power loss, which helps reduce the number of cells 10 in the thin-film photovoltaic module. This reduces the cost of laser cutting during cell 10 manufacturing and mitigates the impact of laser equipment depreciation on the process. Simultaneously, it lowers the voltage of the thin-film photovoltaic module, which helps reduce the cost of the inverter in the photovoltaic power generation system, thereby reducing electricity costs. Additionally, in some embodiments, the resistivity of the material of the first conductive line 160 can be set to be less than the resistivity of the transparent electrode material in the second electrode layer 150. When the first conductive line 160 is disposed on the second electrode layer 150, the current on the second electrode layer 150 can be collected, further reducing the equivalent resistance when the current passes through the second electrode layer 150, and further reducing the power loss when the current passes through the second electrode layer 150. For example, the material of the first conductive line 160 may include metal.

[0025] The technical solution of this embodiment, by connecting a first conductive line to a second electrode layer and extending the first conductive line along a first direction, effectively makes the first conductive line and the second electrode layer connected in parallel. This reduces the equivalent resistance when current flows through the second electrode layer, thereby reducing power loss and increasing the output power of the thin-film photovoltaic module. Furthermore, it reduces the limitation on the width of each cell due to power loss, which helps reduce the number of cells in the thin-film photovoltaic module. This reduces the cost of laser cutting during cell manufacturing and mitigates the impact of laser equipment depreciation on the process. Simultaneously, it lowers the voltage of the thin-film photovoltaic module, which helps reduce the cost of the inverter in the photovoltaic power generation system, thus lowering the cost of electricity.

[0026] Continue to refer to Figure 1 and Figure 2 Each battery 10 includes multiple first conductive lines 160, which are arranged at equal intervals.

[0027] Specifically, the battery 10 may include multiple first conductive lines 160. These multiple first conductive lines 160 can converge currents at different locations on the second electrode layer 150, thereby further reducing the equivalent impedance when current passes through the second electrode layer 150 and further reducing the power loss of the battery 10. When the multiple first conductive lines 160 are arranged at equal intervals, they can be evenly distributed on the second electrode layer 150, thereby improving the uniformity of current distribution when current passes through the second electrode layer 150, ensuring the uniformity of power loss distribution, and avoiding local overheating of the second electrode layer 150.

[0028] In some embodiments, the spacing between adjacent first conductive lines 160 ranges from 0.5 to 2 mm.

[0029] Specifically, when the material of the first conductive line 160 includes metal, the light transmittance of the first conductive line 160 is relatively poor. In this case, setting the spacing between adjacent first conductive lines 160 to be greater than or equal to 0.5 mm can ensure the transmittance of light passing through the first conductive line 160 to the light-emitting functional layer 130, thereby ensuring the output power of the thin-film photovoltaic module. Moreover, setting the spacing between adjacent first conductive lines 160 to be less than or equal to 2 mm can ensure the number of first conductive lines 160, thereby minimizing the equivalent resistance when current passes through the second electrode layer 150 and reducing power loss when current passes through the second electrode layer 150. For example, the spacing between adjacent first conductive lines 160 can be 1 mm.

[0030] In some embodiments, the width of the first conductive line 160 is in the range of 0.001-1mm, and the thickness of the first conductive line 160 is in the range of 0.001-1mm. This can reduce the resistance of the first conductive line 160 while reducing its impact on light shading, thereby improving the overall output power of the battery and thus the output power of the thin-film photovoltaic module.

[0031] In some embodiments, the material of the second electrode layer includes at least one of tin oxide doped with tin fluoride, indium tin oxide, aluminum zinc oxide, and indium tungsten oxide. This ensures the transmittance and conductivity of the second electrode layer.

[0032] In some embodiments, the material of the first electrode layer may include metals such as gold, silver, copper, aluminum and molybdenum, as well as at least one of transparent conductive oxide (TCO).

[0033] Continue to refer to Figure 1 and Figure 2 A back glass 100 may also be provided on the side of the first electrode layer 110 away from the first charge transport layer 120 to protect and encapsulate the other film layers of the battery 10.

[0034] Continue to refer to Figure 2 An encapsulating film 101 may be provided on the side of the first conductive line 160 away from the second electrode layer 150 for encapsulating the battery 10. A front glass 102 may also be provided on the side of the encapsulating film 101 away from the first conductive line 160 for protecting the other film layers of the battery 10.

[0035] For example, Figure 3 This is a schematic diagram of current collection on the second electrode layer in a conventional thin-film photovoltaic module, provided as an embodiment of the present invention. Figure 4 A method provided for embodiments of this utility model Figure 1 and Figure 2 The diagram below shows the current flow on the second electrode layer of the corresponding thin-film photovoltaic module. The following example uses a perovskite cell with dimensions of 1154*7mm, an efficiency of 20.9%, and a current density of 230A / m². 2 Examples and explanations are provided below. Table 1 is a schematic table of power loss of a thin-film photovoltaic module under different current collection methods provided in this embodiment of the present invention. The first current collection method is the current collection method on the second electrode layer in a traditional thin-film photovoltaic module, and the second current collection method is... Figure 1 and Figure 2The provided current-combining method for the second electrode layer in the thin-film photovoltaic module is as follows: P1 represents the power loss of the first electrode layer 110 in cell 10, P2 represents the power loss of the second electrode layer 150 in cell 10, P3 represents the dead zone power loss of cell 10, P4 represents the power loss of the first conductive line 160, P5 represents the power loss caused by shading of the first conductive line 160, P is the sum of the power losses from P1 to P5, and P*N represents the power loss of the thin-film photovoltaic module, which is equal to the power loss P of each cell 10 multiplied by the number of cells N in the thin-film photovoltaic module. As shown in Table 1, under the condition that the size of the cells 10 is the same, the power loss of the second electrode layer 150 in the second current-combining method is reduced by more than 10 times compared to the power loss of the second electrode layer 150 in the first current-combining method. Combined with the power loss of the first conductive line 160 and the shading loss, the power loss of the thin-film photovoltaic module is reduced by 3.15W. At this point, the width of the battery 10 along the first direction X can be increased, reducing the number of batteries 10 in the thin-film photovoltaic module, thereby reducing the cost of laser cutting during the manufacturing process of the battery 10 and the voltage of the thin-film photovoltaic module. Table 2 is a schematic table of power loss of a thin-film photovoltaic module when the battery has different widths along the first direction according to an embodiment of the present invention. Wherein, the width is the width of the battery along the first direction, the first current-combining method is the current-combining method on the second electrode layer in a traditional thin-film photovoltaic module, and the second current-combining method is... Figure 1 and Figure 2The provided current-combining method for the second electrode layer in the thin-film photovoltaic module is as follows: P1 represents the power loss of the first electrode layer 110 in cell 10, P2 represents the power loss of the second electrode layer 150 in cell 10, P3 represents the dead zone power loss of cell 10, P4 represents the power loss of the first conductive line 160, P5 represents the power loss caused by shading of the first conductive line 160, P is the sum of the power losses from P1 to P5, and P*N represents the power loss of the thin-film photovoltaic module, which is equal to the power loss P of each cell 10 multiplied by the number of cells N in the thin-film photovoltaic module. As shown in Table 2, when the width of cell 10 along the first direction X changes from 7mm to twice its original width (14mm), the power loss of the second electrode layer 150 in the first current-combining method increases by about 10 times, resulting in a power loss of over 19W for the thin-film photovoltaic module. In the second current-combining method, the change in power loss of the second electrode layer 150 is relatively small, resulting in a power loss of the thin-film photovoltaic module increasing only from 1.98W to 2.9W. In the second current-combining method, when the width of the battery 10 along the first direction X increases from 7mm to three times its original width, reaching 21mm, the power loss of the thin-film photovoltaic module is 5.6W. Compared to the first current-combining method, without increasing the power loss of the thin-film photovoltaic module, the number of batteries 10 can be reduced by three times, thereby reducing the cost of laser cutting during the manufacturing process of the batteries 10 and reducing the voltage of the thin-film photovoltaic module by three times. For example, when the width of the battery 10 along the first direction X is 7mm, a 1.2*0.6m thin-film photovoltaic module has 81 batteries 10 connected in series. When the output voltage of the battery 10 is about 1V, the voltage of the thin-film photovoltaic module is about 81V. When the maximum voltage within the input voltage range of the inverter in the photovoltaic power generation system is 1000V, a maximum of 12 thin-film photovoltaic modules can be connected in series by one inverter. When the width of the battery 10 along the first direction X is 21mm, a 1.2*0.6m thin-film photovoltaic module has 27 batteries 10 connected in series. When the output voltage of battery 10 is around 1V, the voltage of the thin-film photovoltaic module is around 27V. When the maximum input voltage range of the inverter in the photovoltaic power generation system is 1000V, a single inverter can connect up to 37 thin-film photovoltaic modules in series. This reduces the cost of the inverter, thereby reducing the cost of electricity.

[0036] Table 1

[0037]

[0038] Table 2

[0039]

[0040]

[0041] In some embodiments, the material of the first conductive wire includes a low-temperature conductive adhesive; wherein the low-temperature conductive adhesive has a low-temperature curing temperature of less than or equal to 200°C.

[0042] Specifically, the conductive adhesive can include a colloid and conductive particles. The colloid can be a resin system, such as silicone, acrylic, and epoxy, to ensure the light transmittance of the first conductive line. The conductive particles can be made of metals such as gold, silver, copper, silver-plated copper, and silver-plated nickel to ensure the conductivity of the first conductive line. Moreover, the low-temperature conductive adhesive has a curing temperature of less than or equal to 200°C, which is beneficial for the curing of the first conductive line during the manufacturing process.

[0043] Figure 5 A three-dimensional structural schematic diagram of another thin-film photovoltaic module provided in this embodiment of the present invention is shown below. Figure 5 As shown, the battery 10 also includes at least one second conductive line 180, which is disposed in the same layer as the first conductive line 160 and extends along the second direction Y; wherein the second direction Y intersects the first direction X.

[0044] Specifically, Figure 5 The example illustrates a battery 10 comprising multiple second conductive lines 180 arranged along a first direction X. The extending directions of the second conductive lines 180 intersect the extending directions of the first conductive lines 160, and they are arranged in the same layer, such that the first conductive lines 160 and the second conductive lines 180 intersect. In this case, the second conductive lines 180 and the first conductive lines 160 form a mesh of conductive lines on the second electrode layer 150, thereby further reducing the equivalent resistance when current flows through the second electrode layer 150, thus reducing power loss when current flows through the second electrode layer 150 and improving the output power of the thin-film photovoltaic module. The first conductive lines 160 and the second conductive lines 180 can be made of the same material, for example, both including metal. When the resistivity of the second conductive lines 180 is less than the resistivity of the second electrode layer 150, the current on the second electrode layer 150 can be collected, further reducing power loss when current flows through the second electrode layer 150 and improving the power of the thin-film photovoltaic module.

[0045] Figure 6 This is a top view schematic diagram of a thin-film photovoltaic module provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the battery 10 includes at least two sub-batteries 11 arranged along the second direction Y; in adjacent sub-batteries 11, the second electrode layer 150 of one sub-battery 11 is connected to the first electrode layer 110 of the other sub-battery 11; each second conductive line 180 includes multiple conductive lines 191 extending along the second direction Y, and each conductive line segment 191 is disposed on the second electrode layer 150 of one sub-battery 11.

[0046] Specifically, when the battery 10 includes both a first conductive line 160 and a second conductive line 180, each battery 10 can be divided into multiple series-connected sub-batteries 11 along the second direction Y to reduce the length of each sub-battery 11 along the second direction Y. For example, when forming a first groove on the first electrode film layer by laser scribing, a fourth groove can be simultaneously formed between adjacent sub-batteries 11, thus disconnecting the first electrode layers 110 corresponding to adjacent sub-batteries 11. After forming the second charge transport film layer, when forming the second groove by laser scribing, a fifth groove can be simultaneously formed between adjacent sub-batteries 11, thus disconnecting the first charge transport layer 120, the power generation layer 130, and the second charge transport layer 140 corresponding to adjacent sub-batteries 11. Then, when forming the second electrode layer 150, an extension 170 is formed simultaneously. The extension 170 extends from the second electrode layer 150 to the first electrode layer 110 through the fifth groove, so that the second electrode layer 150 of one sub-battery 11 is connected to the first electrode layer 110 of another sub-battery 11 through the extension 170, thereby realizing the series connection between adjacent sub-batteries 11.

[0047] The second conductive line 180 includes multiple conductive segments 191, each of which is disposed on the second electrode layer 150 of a sub-cell 11. Each conductive segment 191 is effectively connected in parallel with the corresponding second electrode layer 150 of the sub-cell 11, thereby reducing the equivalent resistance when current flows through the second electrode layer 150 of each sub-cell 11 and lowering the power loss of each sub-cell 11. Furthermore, the length of each conductive segment 191 along the second direction Y is less than the length of the second conductive line 180 along the second direction Y, which reduces the current transmission path along the second direction Y, further reducing power loss on the second electrode layer 150 and improving the output power of the thin-film photovoltaic module.

[0048] For example, a thin-film photovoltaic module with a size of 1.2*0.6m is used as an example for illustration. Table 3 is a schematic table showing the influence of the length of the battery along the second direction on the power loss of the thin-film photovoltaic module according to an embodiment of this utility model. Here, length refers to the length of the battery along the second direction Y, P6 is the power loss of the thin-film photovoltaic module when a first conductive line is provided on the second electrode layer, and P7 is the power loss of the thin-film photovoltaic module when a first conductive line and a second conductive line are provided on the second electrode layer. As shown in Table 3, when the length of the battery along the second direction Y gradually decreases, the power loss of the thin-film photovoltaic module corresponding to the current-combining method of providing a first conductive line on the second electrode layer remains basically unchanged, while the power loss of the thin-film photovoltaic module corresponding to the current-combining method of providing a first conductive line and a second conductive line on the second electrode layer gradually decreases, stabilizing after 231mm. Therefore, the battery 10 can be divided into multiple sub-cells 11 along the second direction Y, and the second conductive line 180 can be divided into multiple conductive segments 191 along the second direction Y, thereby reducing the power loss of the thin-film photovoltaic module.

[0049] Table 3

[0050] Length (mm) P6(W) P7(W) 1154 1.93 9.76 577 1.93 3.95 384 1.93 2.93 289 1.94 2.63 231 1.93 2.52 192 1.93 2.50 165 1.94 2.51

[0051] Table 4

[0052]

[0053]

[0054] In some embodiments, the thickness of the first electrode layer is greater than or equal to 5-15 mm.

[0055] Specifically, in conventional thin-film photovoltaic modules, the thickness of the first electrode layer can be set between 50-150 nm. In the technical solution of this embodiment, the thickness of the first electrode layer can be set to be greater than or equal to 5-15 mm, increasing the thickness of the first electrode layer by up to 100 times compared to the thickness of the first electrode layer in conventional thin-film photovoltaic modules. This reduces the power loss of the first electrode layer, thereby reducing the power loss of the thin-film photovoltaic module. Furthermore, it reduces the limitation on the width of the cell along the first direction, which is beneficial for further reducing the number of cells.

[0056] For example, Table 4 is a schematic table illustrating the influence of the width of the battery along the first direction on the power loss of a thin-film photovoltaic module according to an embodiment of the present invention. Wherein, the width is the width of the battery along the first direction X; P6 represents the power loss of the first thin-film photovoltaic module, wherein a first conductive line is disposed on the second electrode layer of the first thin-film photovoltaic module, and the thickness of the first electrode layer ranges from 50-150 nm; P7 represents the power loss of the second thin-film photovoltaic module, wherein a first conductive line and a second conductive line are disposed on the second electrode layer of the second thin-film photovoltaic module, and the thickness of the first electrode layer is the same as that of the first thin-film photovoltaic module; P8 represents the power loss of the third thin-film photovoltaic module, wherein the difference between the third and first thin-film photovoltaic modules is that the thickness of the first electrode layer is increased by 100 times; P9 represents the power loss of the fourth thin-film photovoltaic module, wherein the difference between the fourth and second thin-film photovoltaic modules is that the thickness of the first electrode layer is increased by 100 times. As shown in Table 4, when setting the width of the battery along the first direction and the length along the second direction based on a power loss of 5W for the thin-film photovoltaic module, if only the first conductive line is set on the second electrode layer, the width of the battery along the first direction can be less than or equal to 21mm, and the number of batteries can be reduced by a factor of 3. When the thickness of the first electrode layer increases by 100 times, the width of the battery along the first direction can be less than or equal to 35mm, and the number of batteries can be reduced by a factor of 5. When both the first and second conductive lines are set on the second electrode layer, the length of the battery along the second direction can be less than or equal to 231mm, and the width along the first direction can be less than or equal to 21mm. When the thickness of the first electrode layer increases by 100 times, the width of the battery along the first direction can be set to approximately 105mm, and the number of batteries can be reduced by a factor of 3.

[0057] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A thin film photovoltaic module, characterized by, The battery comprises a plurality of batteries arranged along a first direction, and each battery comprises a first electrode layer, a first charge transport layer, a power generation functional layer, a second charge transport layer, a second electrode layer and a first conductive wire arranged in layers.

2. The thin-film photovoltaic module of claim 1, wherein, The battery further comprises an extension part integrally formed with the second electrode layer, the extension part extending along the thickness direction of the first electrode layer and being in contact with the first electrode layer of another battery.

3. The thin-film photovoltaic module of claim 2, wherein, The battery further comprises at least one second conductive wire arranged in the same layer as the first conductive wire, the second conductive wire extending along a second direction; wherein the second direction intersects the first direction.

4. The thin film photovoltaic module of claim 2, wherein, The battery comprises at least two sub-batteries arranged along the second direction; in adjacent sub-batteries, the second electrode layer of one sub-battery is connected to the first electrode layer of another sub-battery; each second conductive wire comprises a plurality of conductive wire segments extending along the second direction, and each conductive wire segment is arranged on the second electrode layer of a sub-battery.

5. The thin-film photovoltaic module according to any of claims 1 to 4, characterized in that, The thickness of the first electrode layer is greater than or equal to 5-15 mm.

6. The thin film photovoltaic module of claim 5, wherein, Each battery comprises a plurality of first conductive wires arranged at equal intervals.

7. The thin film photovoltaic module of claim 1, wherein, The interval between adjacent first conductive wires ranges from 0.5 mm to 2 mm.

8. The thin film photovoltaic module of claim 1, wherein, The width of the first conductive wire ranges from 0.001 mm to 1 mm, and the thickness of the first conductive wire ranges from 0.001 mm to 1 mm.

9. The thin film photovoltaic module of claim 1, wherein, The material of the first conductive wire comprises low-temperature conductive glue; wherein the low-temperature conductive glue has a low-temperature curing temperature less than or equal to 200℃. The material of the second electrode layer comprises one of fluorine-doped tin oxide (FTO), indium tin oxide (ITO), aluminum zinc oxide (AZO) and indium tungsten oxide (IWO).

Images