JP4582723B1 - Apparatus and method for evaluating characteristics of solar cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell characteristic evaluation apparatus capable of easily and accurately performing characteristic evaluation of a solar cell in which positive and negative electrodes are formed on the back side of a light receiving surface.
An apparatus for evaluating the characteristics of a solar cell in which positive and negative electrodes are formed on the back side of a light receiving surface, the support unit supporting the back side of the solar cell, and the support unit. And an irradiating means 20 for irradiating light to the light receiving surface of the solar cell. The supporting means 10 has a conductive pattern in contact with each electrode of the solar cell, and a flat porous plate that supports the conductive pattern on the surface side. A plate and suction means 19 for sucking the back side of the porous plate are provided.
[Selection] Figure 1

Description

  The present invention relates to a solar cell characteristic evaluation apparatus and method, and more particularly to a solar cell characteristic evaluation apparatus and method in which positive and negative electrodes are formed on the back side of a light receiving surface.

  In order to evaluate the performance of a solar cell, it has been conventionally performed to measure the current-voltage characteristics (IV characteristics) between electrodes by irradiating pseudo-sunlight on a light receiving surface. Recently, a so-called back contact type (or back electrode type) solar cell in which an electrode is not formed on the light receiving surface but arranged on the back surface opposite to the light receiving surface has been developed. Efficiency is improved.

  As a solar cell characteristic evaluation device having two types of electrodes on the back side of the light receiving surface, for example, a configuration disclosed in Patent Document 1 is known. In this characteristic evaluation apparatus, as shown in FIG. 6, the solar battery cell 50 is placed on a transparent stage 52 so that the light receiving surface 50 a is in contact, and the probes 54 and 55 are lowered to emit the emitter of the solar battery cell 50. The IV characteristic can be evaluated by bringing the artificial sunlight of the xenon lamp 58 into contact with the electrode 56 and the base electrode 57 and transmitting the stage 52 from the lower surface side and irradiating the light receiving surface 50a.

Japanese Patent Laid-Open No. 10-178192

  However, since the positive and negative electrodes are concentrated on the back side opposite to the light receiving surface, the back contact type solar battery cell uses the conventional characteristic evaluation device that lowers the probe and presses it against the electrode. However, there is a problem that it is difficult to reliably contact the probe while ensuring insulation.

  Accordingly, an object of the present invention is to provide a solar cell characteristic evaluation apparatus and method capable of easily and accurately performing the characteristic evaluation of a solar cell in which positive and negative electrodes are formed on the back side of the light receiving surface.

The object of the present invention is an apparatus for evaluating the characteristics of a solar cell in which positive and negative electrodes are formed on the back side of the light receiving surface, and is supported by the support means for supporting the back side of the solar cell, and the support means. Irradiating means for irradiating light to the light receiving surface of the solar cell, and the supporting means includes a wiring sheet in which a conductive pattern that contacts each electrode of the solar cell is formed on an insulating film, and a large number of fine holes. A flat plate having a flat plate and suction means for sucking the back side of the porous plate, and the wiring sheet has a plurality of suction holes formed at positions not overlapping the conductive pattern of the insulating film. and it has the by the suction of the suction means, said porous plate said wiring sheet characterization of solar cell capable of sucking the solar cell on the wiring sheet through the suction holes while being held on the surface side of the It is achieved by location.

  In the solar cell characteristic evaluation apparatus, the conductive pattern may have a comb-tooth portion. In this case, it is preferable that the suction hole is formed between adjacent comb teeth. The porous plate is preferably made of a plastic sintered body.

Further, the object of the present invention is a method for evaluating the characteristics of a solar cell using the above-described solar cell characteristic evaluation apparatus, the step of adsorbing the solar cell on the wiring sheet, and the light reception of the solar cell. And measuring a current-voltage characteristic under light irradiation on the surface.

  According to the solar cell characteristic evaluation apparatus and method of the present invention, it is possible to easily and accurately evaluate the characteristics of a solar cell in which positive and negative electrodes are formed on the back side of the light receiving surface.

It is a schematic block diagram of the characteristic evaluation apparatus of the solar cell which concerns on one Embodiment of this invention. It is the top view which looked at an example of the photovoltaic cell used as the object of characteristic evaluation from the back side. It is a top view of the support apparatus in the characteristic evaluation apparatus of the solar cell shown in FIG. It is principal part sectional drawing equivalent to the AA cross section of FIG. 3, and has expanded and shown a part. It is an expanded sectional view of the wiring sheet in the characteristic evaluation apparatus of the solar cell shown in FIG. It is a schematic block diagram which shows the conventional characteristic evaluation apparatus of a solar cell.

  Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a solar cell characteristic evaluation apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, the solar cell characteristic evaluation device 1 includes a support device 10 on which solar cells are mounted, and an irradiation device 20 that emits light from above the support device 10.

  The support device 10 includes a frame body 12 at an upper portion of the casing 11, and is configured to be capable of adsorbing and holding solar cells supported by the frame body 12 by operating the vacuum pump 19 to make the inside of the casing 11 have a negative pressure. ing. In addition, the irradiation device 20 includes a light source such as a xenon lamp, and can irradiate the light receiving surface of the solar battery cell mounted on the support device 10.

  As shown in FIG. 2, a solar cell 100 to be subjected to characteristic evaluation has a positive electrode 101 and a negative electrode 102 on the back surface side, and does not have an electrode on the light receiving surface on the front surface side. Cell. A plurality of positive electrodes 101 and negative electrodes 102 are arranged in parallel to each other along one side of the solar battery cell 100, and the positive electrodes 101 are arranged in the recesses 103. The solar battery cell 100 is formed so as to be thickest in the positive electrode 101 and the negative electrode 102 and thinnest in the peripheral insulating portion, and the thickness at the concave portion 103 is an intermediate size between them. Is set.

  3 is a plan view of a support device in the solar cell characteristic evaluation apparatus shown in FIG. 1, and FIG. 4 is a cross-sectional view of a main part corresponding to the AA cross section of FIG. As shown in FIGS. 3 and 4, the frame 12 constituting the upper portion of the support device 10 has a recess 12 a formed on the upper surface side and a through hole 12 b communicating with the central portion of the recess 12 a on the lower surface side. A bolt or the like is inserted into the mounting hole 12 c formed in the peripheral edge portion and fixed to the upper end of the casing 11. As shown in a partially enlarged view in FIG. 4, the porous plate 13 and the wiring sheet 14 are accommodated in the recess 12 a of the frame 12, and the solar battery cell 100 to be evaluated is the frame 12. It arrange | positions on the wiring sheet 14 so that it may become flush with the upper surface.

  The porous plate 13 is a flat plate-like member having substantially the same size as the recess 12a, and is disposed so as to be in contact with the bottom surface of the recess 12a. The porous plate 13 only needs to have a large number of fine holes, and a netting material or punching metal can be used. However, the solar battery cell 100 can be securely adhered to the wiring sheet 14. In addition, it is preferable to have a certain degree of elastic compressibility with strength, and further to have electrical insulation. As the porous plate 13 having such properties, a plastic sintered body obtained by pressing and compacting a plastic powder such as polyethylene, polypropylene, and polyamide can be preferably exemplified. Specifically, Mitsubishi Plastics, Inc. “Fildas S” made by the manufacturer can be exemplified. If the hole diameter of the porous plate 13 is too small, it is difficult to sufficiently adsorb the solar battery cell 100. On the other hand, if the hole diameter is too large, the wiring sheet 14 is fitted into the hole and deforms. Therefore, it is preferable to set the average pore diameter to about 36 to 125 μm. Moreover, when using a plastic sintered compact as the porous plate 13, it is preferable to set an average porosity to about 35-50%.

  As shown in an enlarged cross-sectional view in FIG. 5, the wiring sheet 14 includes a conductive pattern 14b made of a conductive material on one surface of a rectangular insulating film 14a serving as a base. The insulating film 14a is preferably excellent in elasticity and strength in addition to insulating properties. In this embodiment, polyimide resin is used, but silicone rubber or synthetic rubber may be used. Moreover, although copper is used as the material of the conductive pattern 14b in this embodiment, other metals such as silver and nickel, alloys, and the like may be used.

  As shown in FIG. 3, the conductive pattern 14 b is formed of a positive electrode 101 and a negative electrode 102 of the solar battery cell 100 from current collecting portions 14 c and 14 d formed in a band shape along a pair of opposite sides of the insulating film 14 a. Corresponding to the plurality of positive electrode connecting comb teeth 14e and negative electrode connecting comb teeth 14f. The insulating film 14a has an adjacent comb tooth portion 14e, 14f (that is, between two positive electrode connecting comb tooth portions 14e, and a positive electrode connecting comb tooth portion 14e and a negative electrode connecting comb tooth portion. 14 f), a plurality of suction holes 14 g (filled portions in the drawing) are formed at equal intervals along the comb tooth direction.

  The conductive pattern 14b and the suction hole 14g can be formed by etching, for example. That is, after laminating a sheet-like conductive layer on the insulating film 14a and removing the conductive layer portion other than the conductive pattern 14b by etching, the insulating film 14a is selectively etched to form the suction holes 14g. Alternatively, the conductive pattern 14b may be formed after the suction hole 14g is first formed by etching or die cutting.

  Next, the operation of the solar cell characteristic evaluation apparatus 1 having the above-described configuration will be described. First, the solar battery cell 100 and the positive electrode 101 and the negative electrode 102 of the solar battery cell 100 are in contact with the positive electrode connecting comb tooth part 14e and the negative electrode connecting comb tooth part 14f of the wiring sheet 14. The alignment with the wiring sheet 14 is performed, and the solar battery cell 100 is placed on the wiring sheet 14. The alignment between the solar battery cell 100 and the wiring sheet 14 is performed by transferring the solar battery cell 100 above the wiring sheet 14 by a transfer device (not shown) such as a vacuum pad. After adjusting the position by imaging the alignment mark or the like, it can be automatically performed by lowering the solar battery cell 100.

  Next, when the vacuum pump 19 is operated, the back side of the porous plate 13 is sucked. As a result, the wiring sheet 14 comes into close contact with the porous plate 13, and the solar battery cell 100 is sucked through the plurality of suction holes 14 g formed in the wiring sheet 14, and the positive electrode 101 and the negative electrode of the solar battery cell 100 are sucked. 102 are in close contact with the positive electrode connecting comb teeth 14e and the negative electrode connecting comb teeth 14f, respectively.

  And the current-voltage characteristic of the photovoltaic cell 100 is measured under the light irradiation with respect to the light-receiving surface of the photovoltaic cell 100 from the irradiation apparatus 20. FIG.

  According to the solar cell characteristic evaluation apparatus 1 of the present embodiment, the porous plate 13 has a large number of fine holes, whereby the entire wiring sheet 14 can be uniformly adsorbed to the porous plate 13. The wiring sheet 14 can be maintained in a flat state. Then, by sucking the back surface side of the solar battery cell 100 through the plurality of suction holes 14g formed at positions not overlapping the conductive pattern 14b of the insulating film 14a, the solar battery is formed at a portion other than the conductive pattern 14b. Since the cell 100 and the wiring sheet 14 can be reliably adhered, the entire positive electrode 101 and the negative electrode 102 of the solar battery cell 100 can be reliably brought into contact with the conductive pattern 14b. The evaluation of IV characteristics can be performed stably and accurately. The close contact between the solar battery cell 100 and the wiring sheet 14 can be more reliably performed because the porous plate 13 has elastic compressibility.

  As mentioned above, although one Embodiment of this invention was explained in full detail, the specific aspect of this invention is not limited to the said embodiment. For example, in the present embodiment, the conductive pattern 14b is formed in a comb-teeth shape and includes a positive electrode connection comb-teeth portion 14e and a negative electrode connection comb-teeth portion 14f, but the shape of the conductive pattern 14b Is not particularly limited, and can be appropriately changed according to the shape and arrangement of the positive and negative electrodes formed on the back surface side of the solar battery cell. When the conductive pattern 14b is formed in a comb-teeth shape, it is preferable to form the suction holes 14g between the adjacent comb-teeth portions 14e and 14f as in the present embodiment, whereby the comb-teeth portion is formed. The solar battery cell 100 can be reliably adhered between 14e and 14f, and the electrical insulation between the comb tooth portions 14e and 14f can be ensured.

  Moreover, in this embodiment, the wiring sheet 14 in which the conductive pattern 14b is formed on the insulating film 14a is arranged on the surface side of the porous plate 13, and the conductive pattern 14b of the wiring sheet 14 is connected to the solar battery cell. Although the positive electrode 101 and the negative electrode 102 on the back surface side of 100 are brought into contact with each other, the conductive pattern may be directly formed on the surface of the porous plate. According to this configuration, since the insulating film 14a is not necessary, the formation of the suction hole 14g is not necessary, and the manufacturing cost of the characteristic evaluation apparatus can be reduced, and the solar battery cell and the conductive pattern can be reliably secured. Can be adhered to. Also in this configuration, the conductive pattern can be formed by etching.

  Moreover, in this embodiment, although the object of characteristic evaluation is made into the photovoltaic cell 100, it is good also about the photovoltaic module which connected the several photovoltaic cell.

DESCRIPTION OF SYMBOLS 1 Solar cell characteristic evaluation apparatus 10 Support apparatus 13 Porous plate 14 Wiring sheet 14a Insulating film 14b Conductive pattern 14e Positive electrode connecting comb tooth part 14f Negative electrode connecting comb tooth part 14g Suction hole 19 Vacuum pump 20 Irradiation apparatus 100 Solar cell 101 Positive electrode 102 Negative electrode

Claims (4)

An apparatus for evaluating the characteristics of a solar cell in which positive and negative electrodes are formed on the back side of the light receiving surface,
Support means for supporting the back side of the solar cell;
Irradiating means for irradiating light to the light receiving surface of the solar cell supported by the supporting means,
The support means is
A wiring sheet in which a conductive pattern in contact with each electrode of the solar cell is formed on an insulating film;
A flat porous plate having a large number of micropores ;
A suction means for sucking the back side of the porous plate;
The wiring sheet has a plurality of suction holes formed at positions that do not overlap the conductive pattern of the insulating film,
An apparatus for evaluating characteristics of a solar cell , wherein the wiring sheet is held on the surface side of the porous plate by suction of the suction means, and the solar cell can be sucked onto the wiring sheet through the suction hole . The solar cell characteristic evaluation apparatus according to claim 1, wherein the conductive pattern has comb teeth, and the suction holes are formed between adjacent comb teeth. The solar cell characteristic evaluation apparatus according to claim 1 , wherein the porous plate is made of a plastic sintered body. A method for evaluating characteristics of a solar cell using the solar cell characteristic evaluation apparatus according to claim 1,
Adsorbing solar cells on the wiring sheet;
A method for evaluating characteristics of a solar cell, comprising: measuring current-voltage characteristics under light irradiation on a light receiving surface of the solar cell.

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