JP2011066231A - Solar battery module and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar battery module in which defective solar battery cells can be individually identified by an easily inspectable configuration and a method, and to provide the method for manufacturing the solar battery module. <P>SOLUTION: The solar battery module 10 includes a substrate 11 and a plurality of solar battery cells 12 mounted to one surface of the substrate 11. The substrate 11 has a first module electrode and a second module electrode which can be connected to the outside, and a plurality of pieces of wiring 31. The solar battery cells 12 are connected in series between the first and second module electrodes via respective pieces of the wiring 31. The substrate 11 further has testing pads 34b each led out from the third wiring 31c for electrically connecting the serially connected solar battery cells 12 among the pieces of the wiring 31. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solar cell module and a manufacturing method thereof, and more particularly to a technique for easily carrying out an electrical performance inspection test in a manufacturing process.

  Conventionally, solar power generation using solar cells (solar cells) has been developed and put into practical use as an energy source. The solar cell converts incident light into electric power and outputs it by the photovoltaic effect. However, generally, the electromotive voltage of one solar cell based on silicon is about 0.5 V, and the electromotive voltage of one solar cell may not be sufficient as a power source for moving a desired electric circuit. is there. Therefore, by forming a solar cell module in which a plurality of solar cells are connected in series, an electromotive voltage at which a desired electric circuit can operate is obtained.

  The solar cell module has a configuration in which a plurality of solar cells installed on a substrate are electrically connected to each other via respective wirings formed on the substrate. In addition, a plurality of solar cells mounted on the substrate are sealed with a resin so as to protect the solar cells.

  However, if even one solar cell module includes defective solar cells, the entire solar cell module becomes a defective product, so that there is a problem in that the manufacturing yield decreases. For example, in the configuration in which a plurality of solar cells are connected in series to increase the electromotive voltage as described above, the electromotive current is the same for all the solar cells connected in series. For this reason, when even one solar cell having a small electromotive force is present among a plurality of solar cells connected in series, the electromotive current of the entire solar cell module is limited by the small electromotive force. There were times when I could not meet.

  Therefore, in order to improve the manufacturing yield of the solar cell module, in the manufacturing process of the solar cell module, after installing the solar cell on the substrate, before fixing and sealing the solar cell, There is an inspection method for inspecting a solar battery cell in a state where the electrode of the solar battery cell is crimped to the wiring of the substrate (for example, see Patent Document 1). According to this method, it is possible to inspect one solar cell at a time, and easily remove any defective product and install another solar cell.

JP 2009-182244 A (released on August 13, 2009)

  However, the conventional inspection method has a problem that it is a configuration and method that are difficult to inspect in order to obtain an appropriate measurement value. That is, since the measurement is performed by applying the test lead of the tester to the thin wiring with a narrow pitch formed on the substrate, the test lead of the tester requires high positional accuracy. Moreover, since it measures in the state which crimped | bonded the electrode of the photovoltaic cell to the wiring of the board | substrate, it is hard to irradiate light to a photovoltaic cell. Furthermore, there is also a problem that damage to the solar battery cell due to pressure bonding occurs.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a solar battery module and a solar battery that can individually identify defective solar battery cells by a configuration and method that can be easily inspected. It is to provide a method for manufacturing a module.

  In order to solve the above problems, a solar cell module of the present invention is a solar cell module comprising a substrate and a plurality of solar cells mounted on one surface of the substrate. The first module electrode and the second module electrode that can be connected to the outside, and a plurality of wirings, wherein the plurality of solar cells are between the first module electrode and the second module electrode. Are connected in series via each of the wirings, and the substrate further includes test pads drawn from wirings that electrically connect the solar cells connected in series among the plurality of wirings. It is characterized by that.

  According to said structure, using the test pad each pulled out from the wiring which electrically connects between the photovoltaic cells connected in series, the electrical property of each photovoltaic cell can be easily measured, It becomes possible to specify a battery cell individually. Thereby, it becomes possible to improve the manufacturing yield of the solar cell module by replacing the specified defective solar cell with another solar cell.

  In the solar cell module of the present invention, it is preferable that the test pad is disposed outside a position where the plurality of solar cells on one surface of the substrate are disposed.

  According to the above configuration, it is possible to easily measure, for example, by simply touching the test lead of the tester from the surface side of the substrate. Further, when the solar cell module is irradiated with light for measurement, it is possible to substantially prevent light shielding by a test lead or the like.

  Further, in order to protect the solar battery cell and measure the test pad, one surface of the substrate covers at least the plurality of solar battery cells and does not cover the test pad. Is preferably formed.

  Further, in the solar cell module of the present invention, the wiring for electrically connecting the solar cells connected in series passes through a through hole penetrating from one surface of the substrate to the other surface, and It is preferable that the other surface of the substrate is drawn out, and the test pad is disposed on the other surface of the substrate.

  According to the above configuration, it is possible to easily measure, for example, by simply touching a test lead of a tester from the back side of the substrate. In addition, when the solar cell module is irradiated with light for measurement, it is possible to prevent light from being blocked by a test lead or the like.

  Furthermore, it is desirable that a sealing resin is formed on one surface of the substrate so as to cover at least the plurality of solar cells in order to protect the solar cells.

  In order to solve the above problems, a method for manufacturing a solar cell module according to the present invention is a method for manufacturing a solar cell module comprising a substrate and a plurality of solar cells mounted on one surface of the substrate. The substrate is provided so that the first module electrode and the second module electrode connectable to the outside, a plurality of wirings, and the plurality of solar cells among the plurality of wirings are connected in series. Each of the plurality of solar cells on one surface of the substrate between the first module electrode and the second module electrode. A first step of mounting so as to be connected in series via wiring, and a second step of forming a sealing resin on one surface of the substrate so as to cover at least the plurality of solar cells, 1 When the solar cell module does not satisfy a predetermined performance between the step and the second step or after the second step, the electrical characteristics of the solar cells are measured using the test pad. The method further includes a test process.

  According to the above method, in the test process, the electrical characteristics of each solar cell are easily measured using the test pads drawn from the wirings that electrically connect the solar cells connected in series. It becomes possible to individually identify defective solar cells.

  Moreover, the manufacturing method of the solar cell module of this invention WHEREIN: It is preferable that the said test process includes the repair process of replacing the solar cell determined to be defective as a result of the said measurement with another solar cell.

  According to said method, it becomes possible to improve the manufacturing yield of a solar cell module by replacing the specified defective solar cell with another solar cell.

  Further, in the method for manufacturing a solar cell module according to the present invention, the test pad is arranged outside the position where the plurality of solar cells on one surface of the substrate are arranged. In the second step, Preferably, the sealing resin is formed so as to cover at least the plurality of solar cells and not cover the test pad.

  According to the above configuration and method, for example, it is possible to easily measure the test lead of the tester simply by applying it from the surface side of the substrate. Further, when the solar cell module is irradiated with light for measurement, it is possible to substantially prevent light shielding by a test lead or the like.

  In the method for manufacturing a solar cell module according to the present invention, the wiring for electrically connecting the solar cells connected in series passes through a through hole penetrating from one surface of the substrate to the other surface. The other side of the substrate is drawn out, and the test pad is preferably disposed on the other side of the substrate.

  According to the above configuration, it is possible to easily measure, for example, by simply touching the test lead of the tester from the back side of the substrate. In addition, when the solar cell module is irradiated with light for measurement, it is possible to prevent light from being blocked by a test lead or the like.

  As described above, in the solar cell module of the present invention, the substrate has the first module electrode and the second module electrode that can be connected to the outside, and a plurality of wirings. The first module electrode and the second module electrode are connected in series via the respective wires, and the substrate is electrically connected between the solar cells connected in series among the plurality of wires. The test pad further includes test pads drawn from the wirings connected to the.

  In the method for manufacturing a solar cell module according to the present invention, the substrate includes a first module electrode and a second module electrode that can be connected to the outside, a plurality of wires, and a plurality of solar cells among the plurality of wires. Are connected to each other in series, and a plurality of solar cells are formed on one surface of the substrate, and the first module electrode and the second module are connected to each other. A first step of mounting the module electrodes so as to be connected in series via the wirings; and a second step of forming a sealing resin on one surface of the substrate so as to cover at least the plurality of solar cells. Each of the solar cells using the test pad when the solar cell module does not satisfy a predetermined performance between the first step and the second step or after the second step. That further include a method of testing step of measuring the electrical characteristics of the pond cells.

  Therefore, it is possible to easily measure the electrical characteristics of each solar cell using test pads drawn from the wirings that electrically connect the solar cells connected in series, and to identify defective solar cells individually. There is an effect that it can be specified. Thereby, the manufacturing yield of a solar cell module can also be improved by replacing the specified defective solar cell with another solar cell.

It is a top view which shows the structure of the solar cell module in one Embodiment of this invention. It is a figure which shows the structure of the photovoltaic cell in the said photovoltaic module, (a) shows the external appearance which looked at the photovoltaic cell from the surface side, (b) shows the external appearance which looked at the photovoltaic cell from the back surface side, (C) shows the state of the photovoltaic effect of the solar battery cell 12. It is a figure which shows the structure of the board | substrate in the said solar cell module, (a) shows the external appearance which looked at the board | substrate from the surface side, (b) shows the external appearance which looked at the board | substrate from the back surface side. (A)-(h) is a figure which shows the manufacturing process flow in the said solar cell module. It is a figure which shows the mode of the dicing of the photovoltaic cell in the manufacturing process flow of the said photovoltaic module. It is an equivalent circuit diagram which shows the electrical structure of the electrical test in the manufacturing process flow of the said solar cell module. It is a figure which shows the structure before dicing a board | substrate in the manufacturing process flow of the said solar cell module. It is a top view which shows the structure of the solar cell module in other embodiment of this invention. It is a figure which shows the structure of the board | substrate in the said solar cell module, (a) shows the external appearance which looked at the board | substrate from the surface side, (b) shows the external appearance which looked at the board | substrate from the back surface side.

[Embodiment 1]
It will be as follows if one Embodiment of this invention is connected based on drawing.

  FIG. 1 is a perspective view showing a configuration example of the solar cell module 10 of the present embodiment. As shown in FIG. 1, the solar cell module 10 includes a substrate 11, solar cells 12, and a sealing resin 13.

  The solar battery cell 12 is a back electrode type solar battery in which one surface (hereinafter referred to as a front surface) is a light incident surface, and the other surface (hereinafter referred to as a back surface) is provided with an electrode that can be connected to the outside. It is. Here, the solar battery cell 12 has a quadrilateral chip shape, and is cut (diced) to a predetermined size after electrodes and the like are formed on one semiconductor substrate (wafer) as described later. ) Is cut out and produced. As the semiconductor substrate of the solar battery cell 12, silicon (crystalline or amorphous), compound (GaAs) or the like can be used, and a thin film type substrate may be used.

  FIG. 2A shows the appearance of the solar battery cell 12 viewed from the front surface side, FIG. 2B shows the appearance of the solar battery cell 12 viewed from the rear surface side, and FIG. 2C shows the photovoltaic power of the solar battery cell 12. Shows the effect. As shown to Fig.2 (a), the surface 12a of the photovoltaic cell 12 has the antireflection film formed in the whole region, and in order to inject the light (sunlight) 22 from the sun 21 efficiently, it is an antireflection texture. Only the structure. As shown in FIG. 2B, the back surface 12 b of the solar battery cell 12 is formed with a positive electrode (positive electrode) 23 and a negative electrode (negative electrode) 24 as electrodes that can be connected to the outside. The + poles 23 and the − poles 24 are arranged in a stripe shape alternately arranged so as to be parallel to each other.

  Moreover, in the photovoltaic cell 12, as shown in FIG.2 (c), the electron-hole pair 25 is excited in the semiconductor substrate with the light 22 which injected from the surface 12a. By this excitation, the holes 26 and the electrons 27 reach the positive electrode 23 and the negative electrode 24, respectively, and can be extracted as an electromotive force. The narrower the interval w1 between the + pole 23 and the -pole 24, the higher the conversion efficiency.

  The substrate 11 is a resin substrate such as glass epoxy, but is not particularly limited as long as it is an insulating substrate having excellent heat resistance. As for the board | substrate 11, a photovoltaic cell is mounted in one surface. Hereinafter, the surface on which the solar cells 12 are mounted is referred to as a front surface, and the opposite surface is referred to as a back surface. FIG. 3A shows an appearance of the substrate 11 viewed from the front surface side, and FIG. 3B shows an appearance of the substrate 11 viewed from the back surface side. The substrate 11 includes a plurality of wirings 31 as wiring patterns, first and second module electrodes 32 and 33 that can be connected to the outside, a test pad 34 that can be connected to the outside, a through hole 35, and a protective film 36. ing.

  As shown by a dotted line in FIG. 3A, solar cells 12 are provided on the surface of the substrate 11 in an arrangement of 2 rows and 5 columns. Depending on the positions of the electrodes of the solar battery cell 12 determined by the arrangement of the solar battery cells 12, the plurality of wirings 31 are connected between the solar battery cells 12, and between the solar battery cell 12 and the first and second module electrodes 32 and 33. And the solar battery cell 12 and the test pad 34b are respectively formed on the front surface and the back surface of the substrate 11 so as to be electrically connected.

  That is, the plurality of wirings 31 are provided so as to connect the solar cells 12 in series between the first and second module electrodes 32 and 33 and are electrically located at one end. A first wiring 31a that electrically connects the positive electrode 23 of the solar battery cell 12 and the first module electrode 32; and a negative electrode 24 of the solar battery cell 12 that is electrically located at the other end. The second wiring 31b that electrically connects the second module electrode 33, the negative electrode 24 of one solar cell 12 and the positive electrode of the other solar cell 12 between the solar cells 12 connected in series. And a plurality of third wirings 31c that electrically connect to the second wiring 31c.

  The first and second module electrodes 32 and 33 are electrodes for performing output as the solar cell module 10, and are disposed on the back surface of the substrate 11. The through hole 35 is disposed on the side where the first wiring 31 a and the second wiring 31 b are provided when viewed from the front surface of the substrate 11, and penetrates from the front surface to the back surface of the substrate 11. The first and second wirings 31a and 31b are led out to the back surface of the substrate 11 through the through holes 35, and are connected to the first and second module electrodes 32 and 33, respectively.

  The test pads 34a and 34b are electrodes for measuring the electrical characteristics of the solar cells 12 in an electrical test in the manufacturing process of the solar cell module 10 described later. The test pad 34 a is disposed on (overlaps) the first wiring 31 a and the second wiring 31 b at the end of the front surface of the substrate 11, and the first wiring 31 a and the second wiring on the back surface of the substrate 11. Is connected to the wiring 31b. The test pad 34a may be formed on either the front surface or the back surface of the substrate 11. The test pad 34 b is disposed (overlapped) on the third wiring 31 c at the end of the surface of the substrate 11. In other words, the test pad 34 b is provided at an electrical intermediate position (intermediate point) of the solar battery cell 12.

  The protective film 36 covers the front surface and the back surface of the substrate 11 so as to have an opening 37. The opening 37 is disposed so as to expose at least the connection portion with the solar battery cell 12 on the wiring 31, the first and second module electrodes 32 and 33, and the test pads 34a and 34b. The protective film 36 is preferably an insulating epoxy resin, polyimide resin, or the like.

  In addition, in the board | substrate 11, electrolytic gold plating may be used as surface treatments, such as a connection part with the photovoltaic cell 12. FIG. In this case, since there is a power supply line for electrolytic gold plating, if the protective film 36 is formed so as to expose a part of the power supply line, the test pads 34a and 34b can be formed, and the number of processes is increased. There is nothing.

  The sealing resin 13 is formed on the surface of the substrate 11 so as to cover at least the solar battery cell 12. As the sealing resin, translucent EVA (ethylene / vinyl acetate copolymer resin), silicone resin, transparent epoxy resin, or the like is used. The sealing resin 13 can protect the solar battery cell 12 and further the surface of the substrate 11.

  Next, the manufacturing method of the solar cell module 10 having the above configuration will be described.

  4A to 4H are diagrams showing a manufacturing process flow of the solar cell module 10. FIG.

  First, as shown in FIG. 4A, a semiconductor substrate 41 (for example, 15 cm square) on which a positive electrode 23 and a negative electrode 24 are formed by a semiconductor manufacturing process is diced into a predetermined size by dicing (for example, 5 cm). Below the corner). At this time, for example, as shown in FIG. 5, it is cut with a circular saw from a predetermined direction. Thereby, the photovoltaic cell 12 can be produced. For example, it may be used without cutting in residential use.

  Subsequently, as illustrated in FIG. 4B, an Ag paste 42 is applied on the wiring 31 formed on the surface of the substrate 11. Alternatively, a solder paste is printed or a conductive adhesive is applied. At this time, in any case, it is applied only to a necessary portion, that is, only to a portion in contact with the electrode of the solar battery cell 12. In FIG. 4B, the application region of the Ag paste 42 is roughly shown. Moreover, the board | substrate 11 is continuously formed in the big board | substrate, and is finally separated into pieces.

  Then, as shown in FIG.4 (c), the individual photovoltaic cell 12 is set | placed after positioning on the surface of the board | substrate 11 (die bond). And as shown in FIG.4 (d), heat is given for a predetermined period and the said paste and adhesive agent are hardened. Thereby, the photovoltaic cell 12 is mounted on the substrate.

  Subsequently, as shown in FIG. 4E, the sealing resin 13 covers at least the plurality of solar cells 12 on the surface of the substrate 11 by, for example, molding, and does not cover the test pads 34a and 34b. To form. In FIG. 4E, the formation region of the sealing resin 13 is roughly shown. And as shown in FIG.4 (f), heat is given for a predetermined period and the said sealing resin 13 is hardened. And the board | substrate 11 is diced into pieces and the solar cell module 10 is produced as shown in FIG.4 (f).

  Then, as shown in FIG.4 (h), an electrical test is performed with respect to the produced solar cell module 10 (test process). The electrical test is a test for measuring an electromotive force generated in the solar cell module 10 by irradiating the solar cell module 10 with light using, for example, a solar light lamp 43. The measurement is performed using a tester 44 having a test lead 45. Then, it is determined whether the measurement result of the electromotive force satisfies a predetermined value (predetermined performance), and the one that satisfies is determined as a final finished product. The predetermined value, that is, the predetermined performance, is determined in advance according to the number of solar battery cells 12 and the like.

  Here, the electrical test will be described in detail. The electrical test is a first test that tests the electrical characteristics of the entire solar cell module 10 and a second test that tests the electrical characteristics of the individual solar cells 12 when the first test fails. Do it in stages.

  In the first test, the test leads 45 are respectively applied to the first and second module electrodes 32 and 33 or the test pad 34a, the solar cell module 10 is irradiated with light, and the electromotive force generated in the solar cell module 10 is measured. To do. This electromotive force is calculated from an electromotive voltage and an electromotive current generated in the solar cell module 10. Then, it is determined whether or not the measurement result of the electromotive force satisfies a predetermined value, those that satisfy the condition are classified as finished products, and those that do not satisfy the second test.

  In the second test, the test leads 45 are respectively applied to the three test pads 34a and 34b, the solar cell module 10 is irradiated with light, and the electromotive force generated in the solar cells 12 is measured. FIG. 6 shows the electrical configuration of the second test. When measuring the electromotive force of a certain solar battery cell 12 (referred to as solar battery cell 1 in the figure), the first test lead 45a is connected to the negative electrode of the solar battery cell 12 by a test pad 34b. (34a). Further, the second test lead 45b is applied to the test pad 34b electrically connected to the positive electrode of the solar battery cell 12. Further, the third test lead 45c is connected to the test pad 34b to which the second test lead 45b is applied. The positive electrode of the solar cell (denoted as the solar cell 2 in the figure) whose negative electrode is electrically connected. Is applied to the test pad 34b (34a) electrically connected.

  Then, the solar cell module 10 is irradiated with light, and the electromotive voltage of the solar cell 1 is measured by the first voltmeter V1 provided between the first test lead 45a and the second test lead 45b. . Further, an electromotive voltage of “solar battery cell 1 + solar battery cell 2” is measured by a second voltmeter V2 provided between the first test lead 45a and the third test lead 45c. In addition, the electromotive voltage of the photovoltaic cell 2 can be calculated by “the value of the second voltmeter−the value of the first voltmeter”. Furthermore, two solar cells are provided by an ammeter A provided between the first test lead 45a and the second test lead 45b and between the first test lead 45a and the third test lead 45c. The electromotive current of the cells 1 and 2 is measured. Then, an electromotive force is calculated from the measured electromotive voltage and electromotive current.

  A power supply E is provided between the first test lead 45a and the third test lead 45c. When the electromotive currents of the two solar cells 1 and 2 are small, the electric power is forcibly applied by the power source E, so that even if solar cells having a small electromotive force are included, the electrical characteristics of the individual solar cells Can be evaluated.

  As a result of measuring the electromotive force, it is determined whether or not the electromotive force satisfies a predetermined value, so that a defective solar battery cell 12 (electromotive force of which the electromotive force is not exerted) from the plurality of solar battery cells 12 is exhibited. It is possible to identify small solar cells 12).

  And after specification, the solar cell module 10 is repaired (repair process). As a repair, the defective solar battery cell 12 is removed from the solar battery module 10 and another solar battery cell 12 is mounted on the substrate 11. And if a 1st test is implemented again and it passes, it will classify | categorize as a finished product, and if it fails, a 2nd test will be performed and the defective photovoltaic cell 12 will be identified and repaired. In this way, it is possible to bring the solar cell module 10 that was initially a defective product to a finished product that satisfies a predetermined performance.

  As described above, the solar cell module 10 includes the substrate 11 having the first and second module electrodes 32 and 33 and the plurality of wirings 31, and the plurality of solar cells 12 mounted on the surface of the substrate 11. The plurality of solar cells 12 are connected in series via the respective wirings 31 between the first module electrode 32 and the second module electrode 33, and the substrate 11 is composed of the plurality of wirings 31. This is a configuration further including test pads 34b each drawn from the third wiring 31c that electrically connects the solar cells 12 connected in series.

  Further, in the method for manufacturing the solar cell module 10, a plurality of solar cells 12 are connected in series between the first module electrode 32 and the second module electrode 33 on the surface of the substrate 11 via each wiring 31. A first step of mounting so as to carry out, and a second step of forming a sealing resin 13 on the surface of the substrate 11 so as to cover at least the plurality of solar cells 12, and the first step and the second step This is a method that further includes a test step of measuring the electrical characteristics of each solar battery cell 12 using the test pad 34b when the solar cell module 10 does not satisfy the predetermined performance during or after the second step.

  Therefore, in the electrical test, the electrical characteristics of the solar cells 12 can be easily obtained by using the test pads 34b drawn from the third wirings 31c that electrically connect the solar cells 12 connected in series. It is possible to measure and identify defective solar cells 12 individually.

  Further, the electrical test includes a repairing step of replacing the solar battery cell 12 determined to be defective as a result of the measurement with another solar battery cell 12. Thereby, it becomes possible to improve the manufacturing yield of the solar cell module 10 by replacing the identified defective solar cell 12 with another solar cell 12.

  Furthermore, in the solar cell module 10, the test pads 34 a and 34 b on the surface of the substrate 11 are arranged at the end of the surface of the substrate 11. Therefore, it is possible to easily measure the test lead 45 of the tester 44 simply by touching it from the surface side of the substrate 11. Further, when the solar cell module 10 is irradiated with light for measurement, it is possible to substantially prevent light shielding by the test leads 45 and the like.

  Further, the test pads 34 a and 34 b on the surface of the substrate 11 are not covered with the sealing resin 13. Therefore, in the description using FIG. 4 described above, the electrical test was performed last. However, the electrical test illustrated in FIG. 4H is not limited to this, and the electrical test illustrated in FIG. It can be carried out at any stage in the processes shown up to after g) (from die bonding to singulation). By carrying out the electrical test before the step of forming the sealing resin 13 in particular, it is possible to reduce labor when repair is necessary.

  In the step of forming the sealing resin 13 shown in FIG. 4E, the sealing resin 13 may be formed in a region as shown in FIG. That is, FIG. 7 shows an example in which the sealing resin 13 is formed so as to cover the plurality of solar cells 12 and not the test pads 34a and 34b. In this case, after hardening the sealing resin 13, the solar cell module 10 reduced in size can be produced by dicing the board | substrate 11 into a piece along a dotted line. However, in this case, it is necessary to perform an electrical test before the dicing step. Further, when the test pads 34a and 34b on the surface of the substrate 11 are not cut, it is necessary to finally seal with a resin.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to the drawings. Configurations other than those described in the present embodiment are the same as those in the first embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and explanation thereof is omitted.

  In the solar cell module 10 of the first embodiment, the test pads 34 a and 34 b are provided on the surface of the substrate 11. On the other hand, in the solar cell module 50 of the present embodiment, test pads 34 a and 34 b are provided on the back surface of the substrate 11.

  FIG. 8 is a diagram illustrating a configuration example of the solar cell module 50 of the present embodiment. FIG. 9A shows an appearance of the substrate 51 as viewed from the front surface side, and FIG. 9B shows an appearance of the substrate 51 as viewed from the back surface side. The solar cell module 50 includes a substrate 51 in addition to the configuration excluding the substrate 11 in the configuration of the solar cell module 10 of the first embodiment.

  The substrate 51 is different from the substrate 11 in the arrangement of the test pads 34a and 34b, and the others have the same configuration. The test pad 34a is disposed on the back surface of the substrate 51 so as to be connected to the first wiring 31a and the second wiring 31b. The test pad 34 b is disposed at the end of the back surface of the substrate 11. The third wiring 31c is drawn out to the back surface of the substrate 11 through the through hole 35, and is connected to the test pad 34b. In other words, the test pad 34 b is provided at an electrical intermediate position (intermediate point) of the solar battery cell 12.

  The solar cell module 50 having the above configuration is manufactured by the same method as the method for manufacturing the solar cell module 10 of the first embodiment described above. Similarly, in the electrical test, the electrical characteristics of the solar cells 12 are measured using the test pads 34b drawn from the third wirings 31c that electrically connect the solar cells 12 connected in series. It is easy to measure, and there is an effect that defective solar cells 12 can be individually identified.

  Further, the electrical test includes a repairing step of replacing the solar battery cell 12 determined to be defective as a result of the measurement with another solar battery cell 12. Thereby, it becomes possible to improve the manufacturing yield of the solar cell module 50 by replacing the identified defective solar cell 12 with another solar cell 12.

  Further, in the solar cell module 50, the test pads 34 a and 34 b on the surface of the substrate 51 are disposed on the back surface of the substrate 51. Therefore, it is possible to easily measure the test lead 45 of the tester 44 simply by touching it from the back side of the substrate 51. Further, when the solar cell module 50 is irradiated with light for measurement, it is possible to prevent light shielding by the test leads 45 and the like.

  In addition, in the description using FIG. 4 described above, the electrical test was performed last. However, the solar cell module 50 is not limited thereto, and the electrical test illustrated in FIG. It can be carried out at any stage in the process shown from after to the end of FIG. 4G (from die bonding to singulation). By carrying out the electrical test before the step of forming the sealing resin 13 in particular, it is possible to reduce the time and labor when repair is necessary.

  In the above description, the solar cell 12 was measured using three test leads 45 in the second test of the electrical test. However, the number of test leads 45 may be increased, and the measurement is performed simultaneously. It becomes possible to increase the number of the photovoltaic cells 12.

  Further, in the above description, the number of solar cells 12, the arrangement on the substrates 11 and 51, the arrangement of the + pole 23 and the -pole 24, etc. are not intended to limit the present invention and are merely examples. Further, in the substrates 11 and 51, wirings and through holes may be formed in addition to the wirings 31 and the through holes 35 described above. In particular, although not shown in the drawings, wiring patterns other than those shown in FIGS. 3 and 9 may be formed on the back surfaces of the substrates 11 and 51.

  Further, the arrangement of the test pads 34a and 34b provided on the surface of the substrate 11 is not limited to the positions shown in FIGS. 1 and 3. However, in consideration of an electrical test, the test pads 34a and 34b are arranged on the substrate 11 side. It is desirable to arrange | position outside the position where the several photovoltaic cell 12 of this surface is arrange | positioned.

  In the above description, the case where the solar battery cell 12 is the back electrode type has been described. However, the present invention is not limited to this, and may be a double-sided electrode type. In the case of using a double-sided electrode type solar cell, the electrode of the solar cell and the substrate 11 are bonded by wire bonding after the step of mounting the solar cell on the substrates 11 and 51 and before the step of conducting the electrical test. A step of connecting the wiring 31 on the 51 may be provided.

  In the examples, the solar cell module using the back electrode type solar cell is described. However, in the case of a solar cell module connected in series using solar cells having electrodes on the front surface and the back surface, Needless to say, the same method can be applied.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be suitably used not only in a field related to a solar battery module including a plurality of solar cells connected in series, but also preferably used in a field related to a manufacturing method of a solar battery module, particularly an inspection method. Further, it can be widely used in the field of power devices including solar cell modules.

DESCRIPTION OF SYMBOLS 10,50 Solar cell module 11,51 Board | substrate 12 Solar cell 13 Sealing resin 23 + Pole 24-Pole 26 Hole 27 Electron 31a 1st wiring (wiring)
31b Second wiring (wiring)
31c Third wiring (wiring)
32 First module electrode 33 Second module electrode 34a Test pad 34b Test pad 35 Through hole 36 Protective film 37 Opening 43 Solar lamp 44 Tester 45 Test lead

Claims (9)

A solar cell module comprising a substrate and a plurality of solar cells mounted on one surface of the substrate,
The substrate includes a first module electrode and a second module electrode that can be connected to the outside, and a plurality of wires.
The plurality of solar cells are connected in series via the wires between the first module electrode and the second module electrode,
The said board | substrate further has the test pad each pulled out from the wiring which electrically connects between the said photovoltaic cells connected in series among these wirings, The solar cell module characterized by the above-mentioned.   2. The solar cell module according to claim 1, wherein the test pad is disposed outside a position where the plurality of solar cells on one surface of the substrate are disposed. 3.   3. The solar cell according to claim 2, wherein a sealing resin is formed on one surface of the substrate so as to cover at least the plurality of solar cells and not to cover the test pad. module. Wirings for electrically connecting the solar cells connected in series are respectively drawn out to the other surface of the substrate through a through hole penetrating from one surface of the substrate to the other surface. And
The solar cell module according to claim 1, wherein the test pad is disposed on the other surface of the substrate.   The solar cell module according to claim 4, wherein a sealing resin is formed on one surface of the substrate so as to cover at least the plurality of solar cells. A solar cell module manufacturing method comprising a substrate and a plurality of solar cells mounted on one surface of the substrate,
The substrate includes a first module electrode and a second module electrode that can be connected to the outside, a plurality of wirings, and a wiring provided to connect the plurality of solar cells among the plurality of wirings in series. Each with a test pad drawn out,
A first step of mounting the plurality of solar cells on one surface of the substrate so as to be connected in series via the wires between the first module electrode and the second module electrode; ,
A second step of forming a sealing resin on one surface of the substrate so as to cover at least the plurality of solar cells,
When the solar cell module does not satisfy a predetermined performance between the first step and the second step or after the second step, the electrical characteristics of each solar cell using the test pad The manufacturing method of the solar cell module characterized by further including the test process which measures this.   The method for manufacturing a solar cell module according to claim 6, wherein the test step includes a repairing step of replacing a solar cell determined to be defective as a result of the measurement with another solar cell. The test pad is disposed outside a position where the plurality of solar cells on one surface of the substrate are disposed,
The method for manufacturing a solar cell module according to claim 6, wherein in the second step, the sealing resin is formed so as to cover at least the plurality of solar cells and not to cover the test pad. . Wirings for electrically connecting the solar cells connected in series are respectively drawn out to the other surface of the substrate through a through hole penetrating from one surface of the substrate to the other surface. And
The method for manufacturing a solar cell module according to claim 6, wherein the test pad is disposed on the other surface of the substrate.

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