JP6281706B2 - Solar cell module manufacturing method and solar cell module manufacturing system - Google Patents

Description

  The present invention relates to a method for manufacturing a solar cell module, a method for manufacturing a solar cell, and a system for manufacturing a solar cell module.

  The solar cell module includes a plurality of solar cells connected by a wiring material, and a protective member such as a glass substrate that protects the solar cells (for example, see Patent Document 1). For example, the solar cells are ranked according to the output in the manufacturing process, and a plurality of solar cells constituting the solar cell module are selected from each rank according to the target output of the solar cell module. This selection is performed using the center value of the output width of each rank. That is, a plurality of solar cells are selected so that the solar cell module output calculated using the center value of each rank satisfies the target output.

JP 2011-049283 A

  However, since the output distribution of the manufactured solar battery cell varies, when the solar battery cell is selected using the center value, there are cases where many solar battery modules that do not satisfy the target output are generated due to variations in module output. Therefore, in order to suppress the generation of solar battery modules that do not satisfy the target output, it is necessary to select solar cells so that the output is slightly higher than the target output. For this reason, the usage amount of the solar cells located on the high output side in the output distribution increases, the inventory of the solar cells located on the high output side in the output distribution decreases, and the low output in the output distribution. The problem that the inventory of the photovoltaic cell located in the side increases occurs. When the inventory of solar cells of a specific rank increases, the solar cells of that rank must be disposed of.

  The method for manufacturing a solar cell module according to the present invention prepares a plurality of solar cells, measures the characteristic values of the solar cells, assigns the solar cells to a plurality of ranks based on the measured characteristic values, and ranks them. An average value of characteristic values is calculated for each set of a predetermined number of divided solar cells, and a plurality of solar cells are selected from at least one of the sets based on the average value and the target module characteristic value. A string of battery cells is produced.

  A standard deviation of characteristic values is calculated for each set, and a plurality of solar cells are selected from at least one of the sets based on the average value, the standard deviation, and the target module characteristic value, and a string of solar cells is produced. Is preferred.

  The solar cell module manufacturing system according to the present invention measures the characteristic values of the solar cells, distributes the solar cells to a plurality of ranks based on the measured characteristic values, and calculates the average value of the characteristic values for each rank. Means for calculating, and means for selecting a plurality of solar cells from at least one of the ranks to produce a string of the solar cells based on the average value and the target module characteristic value.

  ADVANTAGE OF THE INVENTION According to this invention, the target solar cell module can be manufactured efficiently.

It is the top view which looked at the solar cell module which is an example of embodiment which concerns on this invention from the light-receiving surface side. It is a figure which shows a part of XX sectional view of FIG. It is a figure for demonstrating the manufacturing system of the solar cell module which is an example of embodiment which concerns on this invention, and the manufacturing method of a solar cell module. It is a figure which shows the structure of the control apparatus in the manufacturing system of FIG. It is a flowchart for demonstrating the manufacturing method of the solar cell module which is an example of embodiment which concerns on this invention. It is a figure which shows the output distribution of the photovoltaic cell which is an example of embodiment which concerns on this invention. It is a figure which shows the output distribution of the solar cell module which is an example of embodiment which concerns on this invention.

The manufacturing method of the solar cell module 10 and the manufacturing system 50 of the solar cell module which are examples of the embodiment according to the present invention will be described in detail below with reference to the drawings, but the application of the present invention is not limited to this.
The drawings referred to in the embodiments are schematically described, and the dimensional ratios of the components drawn in the drawings may be different from the actual products. Specific dimensional ratios and the like should be determined in consideration of the following description.

  With reference to FIG.1 and FIG.2, the structure of the solar cell module 10 is demonstrated. FIG. 1 is a plan view of the solar cell module 10 as seen from the light receiving surface side. FIG. 2 is a cross-sectional view of the solar cell module 10 cut in the thickness direction along line XX in FIG.

  The solar cell module 10 includes a plurality of solar cells 11, a first protective member 12 disposed on the light receiving surface side of the solar cell 11, and a second protective member 13 disposed on the back surface side of the solar cell 11. Is provided. The plurality of solar cells 11 are sandwiched between the first protective member 12 and the second protective member 13 and are sealed with a filler 14. For the first protective member 12 and the second protective member 13, for example, a translucent member such as a glass substrate, a resin substrate, or a resin film can be used. The second protective member 13 may be, for example, a white member that does not have translucency. For the filler 14, for example, a resin such as ethylene vinyl acetate copolymer (EVA) can be used.

  The solar cell module 10 includes a wiring member 15 that connects a plurality of solar cells 11. The wiring member 15 bends in the thickness direction of the solar cell module 10 between the adjacent solar cells 11 and connects the solar cells 11 in series. Moreover, the solar cell module 10 includes a transition wiring member 16 that connects the wiring members 15, a frame 17 that is attached to the periphery of the first protective member 12 and the second protective member 13, a terminal box (not shown), and the like. A string 18 in which a plurality of solar cells 11 are connected in series is formed by the wiring member 15 and the transition wiring member 16.

  The solar cell 11 includes a photoelectric conversion unit 20 that generates carriers by receiving sunlight, a first electrode 30 that is a light receiving surface electrode formed on the light receiving surface, and a back surface formed on the back surface. And a second electrode 40 that is an electrode. In the solar battery cell 11, the carriers generated by the photoelectric conversion unit 20 are collected by the first electrode 30 and the second electrode 40, respectively. Here, the “light receiving surface” means a surface on which sunlight mainly enters from the outside of the solar battery cell 11, and the “back surface” means a surface opposite to the light receiving surface. For example, over 50% to 100% of the sunlight incident on the solar battery cell 11 is incident from the light receiving surface side.

  The photoelectric conversion unit 20 includes a substrate 21 made of a semiconductor material such as crystalline silicon (c-Si), gallium arsenide (GaAs), indium phosphide (InP), and an amorphous semiconductor formed on the light receiving surface of the substrate 21. A layer 22 and an amorphous semiconductor layer 23 formed on the back surface of the substrate 21 are included. As the substrate 21, an n-type single crystal silicon substrate is particularly suitable. The amorphous semiconductor layer 22 has a layer structure in which, for example, an i-type amorphous silicon layer and a p-type amorphous silicon layer are sequentially formed. The amorphous semiconductor layer 23 has a layer structure in which, for example, an i-type amorphous silicon layer and an n-type amorphous silicon layer are sequentially formed.

  The first electrode 30 has a transparent conductive layer 31 formed on the amorphous semiconductor layer 22 and a collector electrode 32 formed on the transparent conductive layer 31. Similarly to the first electrode 30, the second electrode 40 includes a transparent conductive layer 41 and a collecting electrode 42. However, it is preferable that the collector electrode 42 has a larger area than the collector electrode 32.

The transparent conductive layers 31 and 41 are made of, for example, a transparent conductive oxide obtained by doping metal oxide such as indium oxide (In ₂ O ₃ ) or zinc oxide (ZnO) with tin (Sn), antimony (Sb), or the like. Composed. The collector electrodes 32 and 42 have a structure in which conductive fillers are dispersed in a binder resin such as an epoxy resin, for example. As the conductive filler, metal particles such as silver (Ag), copper (Cu), nickel (Ni), carbon, or a mixture thereof can be used. Of these, Ag particles are preferred. Alternatively, the collector electrodes 32 and 42 may be metal plating electrodes formed by Ag or Cu plating.

  The collector electrodes 32 and 42 are preferably composed of a plurality of finger portions and a plurality of (for example, two or three) bus bar portions. The finger part is a thin line-like electrode formed over a wide range on the transparent conductive layers 31 and 41, and the bus bar part is an electrode that collects carriers from the finger electrode. In addition, the collector electrode 42 may be comprised from metal layers, such as Ag, instead of a finger part.

  A structure other than the above can be applied to the photoelectric conversion portion. For example, an i-type amorphous silicon layer and an n-type amorphous silicon layer are sequentially formed on the light-receiving surface side of a substrate made of n-type single crystal silicon or the like, and an i-type amorphous silicon layer is formed on the back surface side of the substrate. And a photoelectric conversion part in which a p-type region composed of a p-type amorphous silicon layer and an n-type region composed of an i-type amorphous silicon layer and an n-type amorphous silicon layer are formed. Good. In this case, electrodes (p-side electrode and n-side electrode) are provided only on the back side of the substrate. A photoelectric conversion unit including a substrate made of p-type polycrystalline silicon, an n-type diffusion layer formed on the light-receiving surface of the substrate, and an aluminum metal layer formed on the back surface of the substrate; Also good.

  An example of a method for manufacturing the solar cell module 10 will be described with reference to FIGS. FIG. 3 is a diagram illustrating a manufacturing process of the solar cell module manufacturing system 50 and the solar cell module 10. FIG. 4 is a diagram illustrating a configuration of the control device 60. FIG. 5 is a flowchart showing a manufacturing procedure of the solar cell module 10. FIG. 6 is a diagram showing the output distribution of the solar battery cells 11. FIG. 7 is a diagram showing the output distribution of the solar cell module 10.

  As shown in FIG. 3, the solar cell module 10 can be manufactured using a manufacturing system 50. In the manufacturing process of the solar battery module 10, the characteristic value of the solar battery cell 11 is measured, and the solar battery cells 11 are assigned to a plurality of ranks based on the measured characteristic value. The process described here (hereinafter, "this process" The maximum output Pmax (Maximum Power) is used as the characteristic value. In the manufacturing system 50, the solar cells 11 manufactured by a manufacturing facility (not shown) are transported to the selector device 51, the Pmax of the solar cells 11 is measured by the selector device 51, and a plurality of the solar cells 11 are based on Pmax. Sorted into ranks.

The manufacturing system 50 includes the selector device 51 and a string manufacturing device 52 that connects the plurality of solar cells 11 with the wiring member 15 to form the string 18. Further, the manufacturing system 50 includes a cassette 53 that temporarily accommodates the solar cells 11 ranked by the selector device 51. In this step, seven ranks A, B, C, D, E, F, and G (see FIG. 6) are set in order from the highest Pmax. For ranks A to G, an upper limit value and a lower limit value for Pmax are defined, and for rank A, only a lower limit value for Pmax is defined. Solar cells 11 that are below the lower limit value of rank G are discarded as defective products, for example. The cassette 53 has at least seven cassettes 53 _{A to} 53 _G corresponding to the ranks (in FIG. 3, 53 _E , 53 _F and 53 _G are omitted from the viewpoint of clarifying the drawing), and the cassettes 53 _A to 53 Each of 53 _G can hold a predetermined number, for example, 100 solar cells 11. Each rank can be provided with a plurality of cassettes.

  The manufacturing system 50 includes a control device 60 that integrally controls the operation of the system. The control device 60 includes a selector control unit 61 that controls the selector device 51, a string production control unit 62 that controls the string production device 52, information for performing ranking of the solar cells 11, and a measured value of Pmax, which will be described later. Storage unit 63 for storing data such as average values and standard deviations. Examples of information for performing ranking include the upper limit value, the lower limit value, the target output of the solar cell module, and the like of each rank. In addition to these databases, the storage unit 63 can store arithmetic expressions such as standard deviations, control programs, and the like.

  Although FIG. 3 shows one control device 60 that controls the entire manufacturing system 50 in an integrated manner, the functions of the control device 60 may be distributed among a plurality of hardware. Moreover, all the processes may be automatically performed by the function of the control device 60, or a part of this process may be manually performed.

  As shown in FIG. 4, the selector control unit 61 and the string production control unit 62 of the control device 60 each include a plurality of control blocks. The selector control unit 61 includes a characteristic value measuring unit 64 that measures the Pmax of the solar battery cell 11, a rank determining unit 65 that distributes the solar battery cell 11 to each rank based on the measured Pmax, and an average value of Pmax for each rank. An average value calculating means 66 for calculating, and a standard deviation calculating means 67 for calculating a standard deviation of Pmax for each rank are included. The string production control unit 62 uses the average value and the standard deviation to calculate the module output calculation means 68 for calculating the minimum total Pmax of the plurality of solar cells 11, and the wiring material 15 to the selected plurality of solar cells 11. It includes string producing means 69 for attaching and producing the string 18.

  In addition, although the control apparatus 60 was set as the structure which calculates an average value and a standard deviation for every rank, you may comprise so that it may calculate for every manufacturing lot, and the predetermined number of photovoltaic cells 11 divided into each rank It is good also as a structure calculated for every group. The above set may be a unit composed of the maximum number of solar cells 11 that can be accommodated in the cassette, or may be a smaller unit, for example, a predetermined number unit smaller than the maximum number that can be accommodated in the cassette.

  As shown in FIG. 5, in the manufacturing process of the solar cell module 10, first, the photoelectric conversion unit 20 is manufactured (S10). Specifically, an amorphous semiconductor layer 22 including an i-type amorphous silicon layer and a p-type amorphous silicon layer is formed on the light-receiving surface of the substrate 21, and an i-type amorphous film is formed on the back surface of the substrate 21. The photoelectric conversion part 20 is manufactured by forming the amorphous semiconductor layer 23 including the silicon layer and the n-type amorphous silicon layer. The amorphous semiconductor layers 22 and 23 are formed by, for example, CVD or sputtering by placing the cleaned substrate 21 in a vacuum chamber.

For forming the i-type amorphous silicon layer by CVD, for example, a source gas obtained by diluting silane (SiH ₄ ) with hydrogen (H ₂ ) is used. In the case of a p-type amorphous silicon layer, a source gas diluted with hydrogen (H ₂ ) by adding diborane (B ₂ H ₆ ) to silane can be used. In the case of an n-type amorphous silicon layer, a source gas diluted with hydrogen (H ₂ ) by adding phosphine (PH ₃ ) to silane can be used.

  Then, the 1st electrode 30 and the 2nd electrode 40 are each formed on the photoelectric conversion part 20 manufactured by S10 (S11). Transparent conductive layers 31 and 41 are first formed on the amorphous semiconductor layers 22 and 23 of the photoelectric conversion unit 20 by CVD or the like, respectively. Then, collector electrodes 32 and 42 are formed on the transparent conductive layers 31 and 41 by screen printing or electrolytic plating, respectively. The solar battery cell 11 is manufactured by this process.

  In the manufacturing process of the solar cell 11, the solar cell 11 is manufactured under a certain manufacturing condition. For example, Pmax varies due to fluctuations in conditions such as the amount of gas remaining in the vacuum chamber and the plasma generation state. To do. Of course, even in the same lot product with the same raw material and the same manufacturing date, the variation in Pmax occurs. The peak position of the output distribution of Pmax also varies. For example, as shown in FIG. 6, the output distribution of the production lot a has a peak top in the range of rank B, but the output distribution of the production lot b has a peak top in the range of rank C.

The plurality of solar cells 11 manufactured in S11 are transported to the selector device 51, assigned to ranks _{A to G,} and accommodated in the cassettes 53A to 53G corresponding to each rank (S12 to S15). Steps S12 to S15 are automatically executed by the function of the selector control unit 61.

  In S12, Pmax is measured as a characteristic value of the plurality of solar battery cells 11. At this time, the open circuit voltage Voc, the short circuit current Isc, the fill factor FF, and the like may be included as the measured characteristic values. This step is automatically executed by the function of the characteristic value measuring means 64 of the selector control unit 61. In this step, Pmax is measured for all the solar cells 11. Pmax can be measured in accordance with, for example, JIS C 8913.

Subsequently, the solar cells 11 are assigned to a plurality of ranks A to G based on Pmax measured in S12 (S13). This step is executed by the function of the rank determination means 65. Specifically, the upper limit value and the lower limit value of Pmax defining each rank A to G stored in advance in the storage unit 63 are compared with the Pmax of the solar battery cell 11 measured in S12, and the solar battery The cell 11 is classified into ranks A to G. And the photovoltaic cell 11 classified into the ranks _{A- G} is conveyed by cassette 53A-53G by the conveyance means which is not shown in figure. In this case, the measurement value K Pmax also is suitable to be stored are organized for each rank in the storage unit 63, the cassette 53 _A to 53 stowed order and measurement of Pmax to _G of the solar cell 11 More preferably, K is stored as a set of data.

Subsequently, the Pmax of the plurality of solar cells 11 that are ranked in S13, calculates the average value X _A to X _G for each rank (S14). This step is executed by the function of the average value calculation means 66. Specifically, the average values X _{A to} X of Pmax for each rank are obtained by adding together the measured values K arranged for each rank and dividing by the number of measured values K (hereinafter referred to as “data number N”). _G is calculated. The calculation of the average values X _{A to} X _G may be performed sequentially every time Pmax is measured, or may be performed after all the Pmax measurements have been completed.

Subsequently, the standard deviations σ _{A to} σ _G of Pmax are calculated for each rank using the average values X _{A to} X _G calculated in S13 (S15). This step is executed by the function of the standard deviation calculating means 67. The standard deviations σ _{A to} σ _G are calculated for each rank based on the measurement value K arranged for each rank, the number N of data for each rank, and the average values X _{A to} X _G. Calculation of the standard deviation σ _A ~σ _G, for example, the average value X _A to X _G is performed in accordance with the timing calculated.

In this step, from the viewpoint of improving the prediction accuracy of the module output to be manufactured, for example, it is preferable to calculate a value that is twice or three times the standard deviations σ _{A to} σ _{G in} S13, so-called 2σ and 3σ. . Alternatively, the standard deviations σ _{A to} σ _G may be calculated in S13, and 2σ _{A to} 2σ _G and 3σ _{A to} 3σ _G may be calculated in S16 described later.

The average values X _{A to} X _G and the standard deviations σ _{A to} σ _G are stored in the storage unit 63 in association with each other, for example. Then, the stored average values X _{A to} X _G and standard deviations σ _{A to} σ _G become a database used when the string 18 is produced. Alternatively, the information on the average values X _{A to} X _G and the standard deviations σ _{A to} σ _G may be displayed on the corresponding cassette at the time when the process in the selector device 51 is completed. An example of such display is a method of printing characters or barcodes indicating the average value X and standard deviation σ on a label, and sticking the label to the cassettes 53 _A to 53 _G. When 100 solar cells 11 are held in each of the cassettes 53 _{A to} 53 _G , information on the average value X and standard deviation σ of the 100 solar cells 11 is displayed. In this case, in the string production device 52, the display is read or inputted by an operator, and the selection of the solar cells 11 constituting the string 18 is executed.
When a plurality of cassettes are provided in each rank, it is preferable to display information on the average value X and the standard deviation σ for each cassette. In addition, information of the average value X and the standard deviation σ may be displayed for each predetermined number of units of each cassette.

A plurality of solar cells 11 housed in the cassette 53 _A to 53 _G in S13 is conveyed to a string manufacturing apparatus 52 is modularized (S16 to S18). Steps S16 and S17 are automatically executed by the function of the string production control unit 62.

In S16, the average value X _A to X _G, standard deviation σ _A ~σ _G, and on the basis of the target module output Pz, from at least one plurality of solar cells of the cassette 53 _A to 53 _G, corresponding to the rank A~G Cell 11 is selected. This step is executed by the function of the module output calculation means 68 of the string production control unit 62. Specifically, the total Pmax of the plurality of solar cells 11 calculated from the average values X _{A to} X _G and the standard deviations σ _{A to} σ _G , that is, the predicted output of the solar cell module 10 is the target module output Pz. The solar battery cell 11 is selected so that it becomes the above. Note that there are many combinations in the selection of the solar cells 11 for obtaining the target module output Pz, and the combinations are not particularly limited. However, the choice of such solar cell 11, it is preferable to one selection condition inventory per rank of the solar cell 11 in the cassette 53 _A to 53 _G.

  Note that the target module output Pz may be the total Pmax of the selected plurality of solar cells 11, or for the selected plurality of solar cells 11, the solar cell module 10 after the laminating process described later. It may be Pmax of the state. When the Pmax of the state of the solar cell module 10 is set as the target module output Pz, the correlation coefficient between the total Pmax of the selected plurality of solar cells 11 and the Pmax of the state of the solar cell module 10 is determined. Thus, the solar battery cell 11 may be selected. For example, when Pmax in the state of the solar cell module 10 is larger than the total Pmax of the selected plurality of solar cells 11, the output value is smaller than Pmax in the state of the solar cell module 10 in consideration of the correlation coefficient. A plurality of solar cells 11 are selected. On the contrary, when Pmax in the state of the solar cell module 10 is smaller than the total Pmax of the selected plurality of solar cells 11, the output value is larger than Pmax in the state of the solar cell module 10 in consideration of the correlation coefficient. A plurality of solar cells 11 are selected as described above.

Taking the inventory quantity of the solar battery cells 11 into account, taking the case where the solar battery cells 11 are acquired from the cassettes 53 _A , 53 _B , 53 _C as an example, the total Pmax is calculated by Equation 1. U, V, and W are the numbers of the solar cells 11 acquired from the cassettes 53 _A , 53 _B , and 53 _C. In addition, although the case where the photovoltaic cell 11 is acquired from three types of cassettes is illustrated here, the number of cassettes can be arbitrarily set.

そして、数式２を満たすように、Ｕ，Ｖ，Ｗを調整することが好適である。

Then, it is preferable to adjust U, V, and W so as to satisfy Formula 2.

Ｓ１６では、目標出力を満たさない太陽電池モジュールの発生を防止しながら太陽電池セルの使用効率を高めるため、算出されるトータルＰｍａｘの最小値が目標モジュール出力Ｐｚ以上であって、且つ当該最小値が目標モジュール出力Ｐｚに近い値となるように太陽電池セル１１を選択することが好適である。このとき、標準偏差σ_A〜σ_Gの２倍又は３倍の値（２σ_A〜σ_G，３σ_A〜σ_G）を用いてトータルＰｍａｘを算出することが特に好適である。

In S16, in order to increase the use efficiency of the solar battery cells while preventing the generation of solar battery modules that do not satisfy the target output, the calculated minimum value of total Pmax is equal to or greater than the target module output Pz, and the minimum value is It is preferable to select the solar battery cell 11 so as to have a value close to the target module output Pz. At this time, it is particularly preferable to calculate the total Pmax using values (2σ _{A to} σ _G , 3σ _{A to} σ _G ) that are twice or three times the standard deviations σ _{A to} σ _G.

In this step, it can be a plurality of solar cells 11 housed in the cassette 53 _A to 53 _G, module output to produce a solar cell module 10 of the large different grades. For example, as shown in FIG. 7, two types of solar cell modules G1 and G2 having target module outputs Pz1 and Pz2 can be manufactured. FIG. 7 is a diagram showing the frequency distribution of the module output (Pmax), and the solar battery modules G1 and G2 manufactured in this process are selected by the solid line and the solar cells are selected using the center values of ranks A to G. The solar cell modules g1 and g2 (comparative examples) manufactured by doing so are indicated by two-dot chain lines.

In the case of the solar cell modules G1 and G2, since the solar cells are selected using the average values X _{A to} X _G and the standard deviations σ _{A to} σ _G , the module output can be predicted with high accuracy. For this reason, the peak of frequency distribution is sharp compared with the case of the solar cell modules g1 and g2, and the dispersion | variation in the output between each solar cell module becomes small. The peaks of the solar cell modules G1 and G2 are greatly shifted toward the target module outputs Pz1 and Pz2 than the peaks of the solar cell modules g1 and g2. That is, in this process, since the prediction accuracy of the module output is higher than in the case of the comparative example, it is possible to sufficiently prevent the generation of the solar cell module that does not satisfy the target output without giving a large margin to the module output. For this reason, about the solar cell module G1, it can manufacture using many photovoltaic cells located in the low output side in the output distribution which inventory tends to increase in a comparative example. And about the solar cell module G2, it can manufacture using the photovoltaic cell located in a high output in the output distribution which a stock tends to reduce in a comparative example. Furthermore, according to this process, it is also possible to manufacture a solar cell module G3 having a higher output than the solar cell module G2 by using only the solar cells located on the high output side in the output distribution.

  Subsequently, the wiring material 15 is connected to the plurality of solar cells 11 selected in S16 to produce the string 18 (S17). This process is automatically executed by the function of the string creating means 69. The wiring member 15 is attached to the collector electrodes 32 and 42 using, for example, an adhesive made of a film-like or paste-like thermosetting resin, and connects the plurality of solar battery cells 11 in series.

  Subsequently, the constituent members of the solar cell module 10 including the string 18 produced in S17 are stacked and thermocompression bonded (S18). This process is called a laminating process and is performed using a laminator (not shown). In this case, the filler 14 is supplied in the form of a film. In the laminating step, the first resin film constituting the filler 14 is laminated on the first protective member 12, and the string 18 is laminated on the first resin film. Further, a second resin film constituting the filler 14 is laminated on the string 18, and the second protective member 13 is laminated thereon. And it laminates by applying a pressure from the 2nd protection member 13 side, heating at the temperature which each resin film melts. Thus, a structure in which the string 18 is sealed with the filler 14 is obtained. Finally, the frame 17 and the terminal box are attached, and the solar cell module 10 is manufactured.

In this step, the solar cells 11 are assigned to each rank using Pmax as a characteristic value. However, the distribution may be executed using a characteristic value other than Pmax. Specific examples of characteristic values other than Pmax include the fill factor FF, sheet resistance R, short-circuit current Isc, open-circuit voltage Voc, and the like of the solar battery cell 11. Further, in this step, the solar cells 11 are assigned to the respective ranks using only Pmax as a characteristic value, but a plurality of characteristic values may be used. For example, the solar cells 11 that do not satisfy the predetermined short-circuit current Isc may be defective, and the other solar cells 11 may be assigned to each rank using Pmax as a characteristic value.
Moreover, in this process, although the several photovoltaic cell 11 which comprises the solar cell module 10 was selected using the average value X and standard deviation (sigma) of the characteristic value in each rank, a photovoltaic cell was used using only the average value X. 11 may be selected.

  As mentioned above, according to the said manufacturing method, the target solar cell module 10 can be manufactured efficiently. According to the above manufacturing method, the module output to be manufactured is accurately predicted by using the average value and the standard deviation of the solar cell output calculated for each rank in the selection of the solar cells 11 ranked. It becomes possible. For this reason, it becomes easy to obtain the target module output, and the dispersion | variation in the output between the several solar cell modules 10 can be made small. Further, the use efficiency of the solar battery cell is improved, and it is possible to manufacture a further high output module.

  DESCRIPTION OF SYMBOLS 10 Solar cell module, 11 Solar cell, 12 1st protection member, 13 2nd protection member, 14 Filler, 15 Wiring material, 16 Transition wiring material, 17 Frame, 18 String, 20 Photoelectric conversion part, 21 Substrate, 22 , 23 Amorphous semiconductor layer, 30 First electrode, 31, 41 Transparent conductive layer, 32, 42 Collector electrode, 40 Second electrode, 50 Manufacturing system, 51 Selector device, 52 String manufacturing device, 53 Cassette, 60 Control device 61 selector control unit 62 string production control unit 63 storage unit 64 characteristic value measurement unit 65 rank determination unit 66 average value calculation unit 67 standard deviation calculation unit 68 module output calculation unit 69 string production unit

Claims (7)

Prepare multiple solar cells,
Measure the characteristic value of the solar cell,
Based on the measured characteristic values, the solar cells are assigned to a plurality of ranks,
The average value of the characteristic value each calculated for each set of said solar cell a predetermined number divided into the ranks,
Based on the plurality of average values and target module characteristic values calculated for each set of the predetermined number of the solar cells, a plurality of the solar cells from at least one of the set of the predetermined number of the solar cells. A method for manufacturing a solar cell module, in which a string of solar cells is selected. The manufacturing method according to claim 1,
Further, each standard deviation of the characteristic value is calculated for each set of the predetermined number of the solar cells ,
Based on the average value, the standard deviation, and the target module characteristic value, a plurality of the solar cells are selected from at least one of the set of the predetermined number of the solar cells, and a string of the solar cells is obtained. The manufacturing method of the solar cell module to produce. The manufacturing method according to claim 1 or 2,
The method for manufacturing a solar cell module, wherein the characteristic value is an output, and the target module characteristic value is a target module output. A manufacturing method according to claim 2,
The characteristic value is an output, and the target module characteristic value is a target module output;
The total output of the plurality of solar cells calculated from the average value and the standard deviation is greater than or equal to the target module output from at least one of the predetermined number of sets of the solar cells to a plurality of the solar cells. A method for manufacturing a solar cell module, wherein a battery cell is selected. The manufacturing method according to claim 1 or 2,
The characteristic value is an output, and the target module characteristic value is a target module output of the state of the solar cell module,
The plurality of solar cells are selected from at least one of the ranks according to a correlation coefficient between the total output of the plurality of selected solar cells and the output of the state of the solar cell module A method for manufacturing a solar cell module. Means for measuring the characteristic value of the solar battery cell, and distributing the solar battery cell into a plurality of ranks based on the measured characteristic value;
It means for calculating respective average values of the characteristic value for each set of said solar cell a predetermined number divided into the ranks,
Based on the plurality of average values and target module characteristic values calculated for each set of the predetermined number of the solar cells, a plurality of the solar cells from at least one of the set of the predetermined number of the solar cells. Means for selecting the string of solar cells, and
A system for manufacturing a solar cell module. The manufacturing system according to claim 6 ,
Further comprising means for calculating respective standard deviations of the property values for each set of the predetermined number of the solar cells,
The means for producing the string selects a plurality of solar cells from at least one of the predetermined number of sets of the solar cells based on the average value, the standard deviation, and the target module characteristic value. Solar cell module manufacturing system.

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