JP6204152B2 - Solar cell output measuring jig and solar cell output measuring method - Google Patents

Description

  The present invention relates to a solar cell output measuring jig and a solar cell output measuring method.

  Conventionally, as a measurement jig for measuring electric characteristics of a solar battery cell, an output measurement jig for a solar battery cell having a plurality of probe pins that are in contact with bus bar electrodes of the solar battery cell is generally used ( For example, see Patent Documents 1 and 2).

  In recent years, in order to reduce the number of manufacturing steps of solar cells, reduce the amount of electrode material such as Ag paste, and reduce the manufacturing cost, without providing a bus bar electrode, a conductive adhesive film is provided. There has been proposed a method of connecting a tab wire that directly becomes an interconnector so as to intersect the finger electrode. In such a solar cell with a bus bar-less structure, the current collection efficiency is equal to or higher than that of the solar cell in which the bus bar electrode is formed.

When measuring electrical characteristics of such a solar cell with a bus barless structure, it is necessary to directly contact the probe pin with the finger electrode.
However, in the conventional output measuring jig for solar cells, the interval between the probe pins and the interval at which the finger electrodes are formed often do not coincide with each other, and it is impossible to conduct all the finger electrodes. There is a problem that finger electrodes are removed from the measurement target, and accurate electrical characteristics cannot be measured.

Therefore, in order to solve the above problems, the present inventors include a plurality of probe pins that are in contact with linear electrodes (finger electrodes) formed on the surface of the solar battery cell, and a holder that holds the probe pin. Provided, a plurality of the probe pins are arranged, a current measurement terminal for measuring the current characteristics of the solar battery cell by being arranged on the linear electrode, and a plurality of the probe pins are arranged, A solar cell having a voltage measurement terminal for measuring voltage characteristics of the solar cell by being disposed on the linear electrode, wherein the current measurement terminal and the voltage measurement terminal are provided in parallel; A measuring jig has been proposed (see, for example, Patent Document 3).
This proposed technique solves the problem of finger electrodes that are not subject to measurement.
However, the finger electrode in the solar battery cell is often formed by baking the Ag paste after screen printing, and the variation in the thickness direction is large. Therefore, even with this proposed technique, the contact area between each probe pin and the finger electrode is not constant, and as a result, there is a problem that the contact resistance varies and it is difficult to obtain an accurate output value.

  Accordingly, it is currently required to provide a solar cell output measurement jig and a solar cell output measurement method that reduce variations in measured resistance values and enable stable output measurement. .

JP 2006-118983 A JP 2011-99746 A JP2013-102121A

  An object of the present invention is to solve the above-described problems and achieve the following objects. That is, an object of the present invention is to provide a solar cell output measuring jig and a solar cell output measuring method that can reduce variations in measured resistance values and enable stable output measurement.

<1> A plurality of probe pins are arranged, and a current measuring terminal for measuring the current characteristics of the solar battery cell;
A plurality of probe pins are arranged, and a voltage measuring terminal for measuring voltage characteristics of the solar battery cell;
A holder for holding the current measurement terminal and the voltage measurement terminal in parallel;
In the probe pin of the current measurement terminal and the voltage measurement terminal, the surface of the abutting portion in contact with the finger electrode of the solar battery cell has a plurality of grooves. .
<2> The solar cell output measuring jig according to <1>, wherein the shape of the plurality of grooves is a plurality of concentric circles having different diameters.
<3> The solar cell output measurement jig according to <2>, wherein in a plurality of concentric grooves having different diameters, an average interval between adjacent grooves is 30 μm to 300 μm.
<4> The solar cell output measuring jig according to any one of <1> to <3>, wherein an average depth of the grooves is 30 μm to 250 μm.
<5> A plurality of probe pins of the current measurement terminal are arranged in a zigzag,
The solar cell output measurement jig according to any one of <1> to <4>, wherein a plurality of probe pins of the voltage measurement terminal are arranged in a zigzag manner.
<6> An arrangement step of arranging the current measurement terminal and the voltage measurement terminal of the output measuring jig for a solar battery cell according to any one of <1> to <5> on a finger electrode of the solar battery cell;
And a measuring step of measuring electrical characteristics of the solar cell while irradiating light on the surface of the solar cell.

  According to the present invention, it is possible to solve the conventional problems, achieve the object, reduce variations in measured resistance values, and enable stable output measurement for a solar cell. And an output measuring method for solar cells.

FIG. 1A is a bottom view of an example of a contact portion of a probe pin. 1B is a cross-sectional view of the contact portion of FIG. 1A. FIG. 2 is a bottom view of another example of the contact portion of the probe pin. FIG. 3A is a bottom view of another example of the contact portion of the probe pin. 3B is a cross-sectional view of the contact portion of FIG. 3A. FIG. 4 is a photograph of the bottom surface of an example of the contact portion of the probe pin. FIG. 5 is a perspective view of a photograph of an example of finger electrodes in a solar battery cell. FIG. 6A is a schematic diagram of a contact portion between a probe pin contact portion and a finger electrode at the time of output measurement by a conventional solar cell output measurement jig. FIG. 6B shows a schematic diagram of an example of a contact between a probe pin contact portion and a finger electrode at the time of output measurement by the solar cell output measurement jig of the present invention. FIG. 7 is a perspective view for explaining an example of a process for performing an electrical measurement of the solar battery cell with the solar cell output measuring jig of the present invention. FIG. 8 is a perspective view of an example showing the output measuring jig for a solar battery cell of the present invention. FIG. 9 is a bottom view showing an example of an arrangement of current measurement terminals and voltage measurement terminals. FIG. 10 is a bottom view showing another example of the arrangement of current measurement terminals and voltage measurement terminals. FIG. 11 is a side view showing a state in which the current measuring terminals arranged in a zigzag are brought into contact with the finger electrodes. FIG. 12 is a bottom view showing another example of the contact portion of the probe pin. FIG. 13 is a bottom view showing another example of the contact portion of the probe pin. FIG. 14 is a side view showing another example of the contact portion of the probe pin. FIG. 15 is a diagram for explaining current measurement by the solar cell output measuring jig. FIG. 16 is a diagram for explaining voltage measurement using a solar cell output measuring jig. FIG. 17A is a bottom view of the contact portion of the probe pin according to the first embodiment. FIG. 17B is a cross-sectional view of the contact portion of FIG. 17A. FIG. 18 is a schematic diagram illustrating an arrangement of current measurement terminals and voltage measurement terminals according to the first embodiment. FIG. 19 is a schematic diagram for explaining a method of measuring electrical characteristics in the example.

(Output measurement jig for solar cells)
The output measuring jig for solar cells of the present invention has a current measuring terminal, a voltage measuring terminal, and a holder, and further includes other members as necessary.

<Current measurement terminal, voltage measurement terminal>
The current measuring terminal is formed by arranging a plurality of probe pins.
The current measuring terminal is a terminal for measuring current characteristics of the solar battery cell.
The voltage measurement terminal includes a plurality of probe pins arranged.
The voltage measurement terminal is a terminal that measures voltage characteristics of the solar battery cell.

The plurality of probe pins in the current measuring terminal are connected to each other by, for example, solder connection of a copper wire cable and to an ammeter.
A plurality of the probe pins in the voltage measurement terminal are connected to each other by solder connection of a copper wire cable and to a voltmeter, for example.

<< Probe pin >>
The probe pin has a plurality of grooves on the surface of the abutting portion in contact with the finger electrode of the solar battery cell. That is, the probe pin has a contact portion that contacts the finger electrode of the solar battery cell, and the surface of the contact portion has a plurality of grooves.
Since the surface of the contact portion has a plurality of grooves, the contact area between the probe pin and the finger electrode can be increased. As a result, variation in the measured resistance value is reduced, and stable output measurement is possible.

-Groove-
There is no restriction | limiting in particular as a shape of the said groove | channel, According to the objective, it can select suitably, For example, linear shape, circular shape, etc. are mentioned. The shape of the groove is an appearance of the groove, for example, a shape observed in a bottom view of the contact portion.

  The shape of the plurality of grooves may be, for example, a lattice shape, or may be a plurality of concentric circles having different diameters. However, the plurality of concentric circles having different diameters further reduces variation in resistance value. It is preferable in that it can be performed.

  There is no restriction | limiting in particular as a cross-sectional shape of the said groove | channel, According to the objective, it can select suitably, For example, a rectangle, a triangle, etc. are mentioned.

  An example of the groove will be described with reference to the drawings. FIG. 1A is a bottom view of a contact portion having a plurality of grooves formed of a plurality of concentric circles having different diameters, and FIG. 1B is a cross-sectional view thereof. The groove of FIG. 1B has an average depth of 45 μm, and the cross-sectional shape of the groove is an equilateral triangle having the bottom as a vertex (vertical angle is 60 °) and the surface of the contact portion as the bottom.

  Another example of the groove will be described with reference to the drawings. FIG. 2 is a bottom view of the contact portion having a plurality of grooves configured in a lattice shape.

  Another example of the groove will be described with reference to the drawings. FIG. 3A is a bottom view of a contact portion having a plurality of grooves formed of a plurality of concentric circles having different diameters, and FIG. 3B is a cross-sectional view thereof. The grooves in FIGS. 3A and 3B are similar to the grooves shown in FIGS. 1A and 1B in that they are concentric, but the center groove is the largest and the depth of the groove is the deepest. Such an embodiment is also an embodiment of the present invention.

  FIG. 4 shows a photograph of the bottom surface of an example of the contact portion of the probe pin.

In FIG. 5, the perspective view of the photograph of an example of the finger electrode in a photovoltaic cell is shown.
FIG. 6A is a schematic diagram of contact points between the contact portions of the probe pins and the finger electrodes at the time of output measurement using a conventional output measuring jig for solar cells.
FIG. 6B shows a schematic diagram of an example of a contact between a probe pin contact portion and a finger electrode at the time of output measurement by the solar cell output measurement jig of the present invention.

As shown in FIG. 5, the finger electrodes in the solar battery cell have a wavy shape rather than a uniform thickness.
In such a state, in the conventional solar cell output measuring jig, as shown in FIG. 6A, the contact portion 4b of the probe pin is flat, so that there are few contacts with the finger electrode 3a.
On the other hand, in the solar cell output measuring jig of the present invention, as shown in FIG. 6B, the probe pin contact portion 6B has a plurality of grooves, so that the probe pin contact portion 4b and the finger electrode 3a are provided. The contact area between the probe pin and the finger electrode can be increased.

In the plurality of grooves, the average interval between the adjacent grooves is not particularly limited and may be appropriately selected depending on the purpose, but is preferably 30 μm to 300 μm, more preferably 30 μm to 220 μm, and more preferably 40 μm to 150 μm. Particularly preferred. When the average interval is within the particularly preferable range, it is advantageous in that variation in resistance value can be further reduced.
Here, the interval between adjacent grooves is the distance between the centers of two adjacent grooves. The average interval is an average value when the interval is arbitrarily measured at 10 points in the contact portion.

There is no restriction | limiting in particular as an average depth of the said groove | channel, Although it can select suitably according to the objective, 30 micrometers-250 micrometers are preferable, and 45 micrometers-210 micrometers are more preferable.
The depth of the groove may be uniform or non-uniform in the plurality of grooves.
Here, the average depth is an average value when the depth of the groove is arbitrarily measured at 10 locations in the contact portion.

There is no restriction | limiting in particular as an average width | variety of the said groove | channel, According to the objective, it can select suitably, For example, 10 micrometers-100 micrometers etc. are mentioned.
Here, the average width is an average value when the width of the groove is arbitrarily measured at ten locations in the contact portion.

  There is no restriction | limiting in particular as an arrangement | sequence of the said several probe pin in the said current measurement terminal or the said voltage measurement terminal, According to the objective, it can select suitably, For example, a linear arrangement | sequence, a zigzag arrangement | sequence, etc. are mentioned. Among these, a zigzag arrangement is preferable. That is, it is preferable that the plurality of probe pins of the current measuring terminal are arranged in a zigzag manner. The plurality of probe pins of the voltage measurement terminal are preferably arranged in a zigzag manner.

  There is no restriction | limiting in particular as a formation method of the said groove | channel, According to the objective, it can select suitably, For example, cutting etc. are mentioned.

<< Solar cell >>
There is no restriction | limiting in particular as said solar cell, According to the objective, it can select suitably, For example, a thin film type solar cell, a crystalline solar cell, etc. are mentioned.
As the solar cell, a solar cell having a bus bar-less structure is preferable.

Examples of the crystalline solar battery cell include a single crystal silicon solar battery cell and a polycrystalline silicon solar battery cell.
Examples of the thin film solar cell include an amorphous silicon solar cell, a CdS / CdTe solar cell, a dye-sensitized solar cell, an organic thin film solar cell, a microcrystalline silicon solar cell (tandem solar cell). Cell).

The solar battery cell has a finger electrode as a collecting electrode.
The finger electrodes are usually formed by baking after the Ag paste is applied to the surface to be the light receiving surface of the solar cell by screen printing or the like. In addition, the finger electrode is formed with a plurality of lines having a width of, for example, 50 μm to 200 μm substantially in parallel at predetermined intervals, for example, every 2 mm, over the entire light receiving surface.

The solar battery cell has a photoelectric conversion element.
On the back side opposite to the light receiving surface of the photoelectric conversion element, for example, a back electrode made of aluminum or silver is provided. The back electrode is formed on the back surface of the solar cell by, for example, screen printing, sputtering, or the like.

  There is no restriction | limiting in particular as a magnitude | size of the said photovoltaic cell, According to the objective, it can select suitably, For example, 156 mm x 156 mm etc. are mentioned.

<Holder>
The holder is not particularly limited as long as it is a holder that holds the current measurement terminal and the voltage measurement terminal in parallel, and can be appropriately selected according to the purpose.

  There is no restriction | limiting in particular as a material of the said holder, According to the objective, it can select suitably, For example, a resin material etc. are mentioned. Examples of the resin material include glass epoxy resin, acrylic resin, and polycarbonate resin.

There is no restriction | limiting in particular as a shape of the said holder, According to the objective, it can select suitably, For example, a rectangle etc. are mentioned.
In the rectangular holder, the upper and lower surfaces of the holder are, for example, a long side corresponding to the length of one side of the solar battery cell, and a short side corresponding to the width when the current measuring terminal and the voltage measuring terminal are arranged in parallel. It consists of. In the holder, for example, a plurality of probe pins are embedded in a predetermined arrangement constituting the current measurement terminal and the voltage measurement terminal across the upper and lower surfaces.

(Solar cell output measurement method)
The output measuring method of the solar battery cell of the present invention includes an arrangement step and a measurement step, and further includes other steps as necessary.

<Arrangement process>
The arrangement step is particularly limited as long as it is a step of arranging the current measurement terminal and the voltage measurement terminal of the solar cell output measurement jig of the present invention on the finger electrode of the solar cell. And can be appropriately selected according to the purpose.

<Measurement process>
The measurement step is not particularly limited as long as it is a step of measuring the electrical characteristics of the solar cell while irradiating light on the surface of the solar cell, and can be appropriately selected according to the purpose. .
Examples of the electrical characteristics include IV characteristics.

  Hereinafter, an example of the output measuring jig for a solar battery cell and the output measuring method of the solar battery cell of the present invention will be described with reference to the drawings.

[First Output Jig for Solar Cell]
As shown in FIGS. 7 and 8, the solar cell output measuring jig 1 includes a plurality of probe pins 4 that are in contact with the surface electrode 3 formed on the surface of the solar cell 2, and the probe pins 4. And a holder 5 for holding. The solar cell output measuring jig 1 constitutes a current measuring terminal 6 by arranging a plurality of probe pins 4 and constitutes a voltage measuring terminal 7 by arranging a plurality of probe pins 4. .

  And the output measuring jig 1 for photovoltaic cells is connected with the ammeter 8 while the ends of the plurality of probe pins 4 constituting the current measuring terminal 6 are connected by the solder connection of the copper wire cable. Yes. In the solar cell output measurement jig 1, the ends of the plurality of probe pins 4 constituting the voltage measurement terminal 7 are connected to each other by a solder connection of a copper wire cable and to a voltmeter 9.

Each probe pin 4 has a pin main body 4 a held by the holder 5 and an abutting portion 4 b provided at the tip of the pin main body 4 a and abutting against the surface electrode 3 of the solar battery cell 2. The pin body 4a is formed in a columnar shape, and the contact portion 4b is formed in a columnar shape having a larger diameter than the pin body 4a. In the probe pin 4, when the pin body 4 a is held by the holder 5, the contact portion 4 b protrudes from the lower surface 5 b of the holder 5, and the end portion of the pin body 4 a protrudes from the upper surface 5 a of the holder 5. The probe pins 4 are formed such that the ends of the pin main body 4a protruding from the upper surface 5a of the holder 5 are bound together by solder connection of a copper wire cable, etc. A current measuring terminal 6 and a voltage measuring terminal 7 are arranged in the direction.
A groove is formed on the surface of the contact portion 4 b of the probe pin 4.

  The holder 5 that holds the probe pin 4 is formed in a rectangular plate shape using a resin material. The upper and lower surfaces 5a and 5b of the holder 5 are composed of a long side corresponding to the length of one side of the solar battery cell 2 and a short side having a width in which the probe pins 4 are arranged in a predetermined shape. A plurality of probe pins 4 are embedded in the holder 5 in a predetermined arrangement constituting the current measuring terminal 6 and the voltage measuring terminal 7 between the upper and lower surfaces 5a and 5b.

[[Linear arrangement]]
As shown in FIGS. 8 and 9, the current measuring terminal 6 and the voltage measuring terminal 7 are provided on the lower surface 5 b of the holder 5 in parallel with each other. The current measurement terminal 6 and the voltage measurement terminal 7 are both formed in a straight line along the long side direction of the lower surface 5 b of the holder 5. Each probe pin 4 constituting the current measurement terminal 6 and the voltage measurement terminal 7 has a contact portion 4b having a cylindrical shape with a diameter of 3.5 mm, and a gap S1 between adjacent contact portions 4b is a general finger electrode. It is set to 0.1 mm shorter than the interval.

  The current measurement terminal 6 has a plurality of finger electrodes 3a parallel to each other as the surface electrode 3, for example, by setting the interval S1 of the contact portions 4b to be in contact with the surface electrode 3 of the solar battery cell 2 to 0.1 mm. In the solar cell 2 having a so-called bus barless structure in which only the electrodes are formed at predetermined intervals, the contact portions 4b are arranged at intervals shorter than the general interval (for example, 1.0 mm to 2.0 mm) of the finger electrodes 3a. can do. Therefore, according to the output measuring jig 1 for solar cells, even when the intervals between the finger electrodes 3a are varied by the solar cells 2, it is possible to cope with the intervals between all the finger electrodes 3a. Even when the thickness of the finger electrode 3a varies, the probe pin 4 has a plurality of grooves on the surface of the contact portion 4b, so that the contact area between the probe pin 4 and the finger electrode 3a can be increased. This reduces the variation in the measured resistance value and enables stable output measurement.

  As described above, the output measuring jig 1 for the solar battery cell includes the current measuring terminal 6 and the voltage measuring terminal 7 so that a single row of probe electrodes serves as the current measuring terminal and the voltage measuring terminal. The number of probe pins in contact with the finger electrodes 3a can be increased as compared with the above. In particular, according to the solar cell output measuring jig 1, the contact portions 4b of the probe pins 4 on all the finger electrodes 3a. Can be brought into contact with each other. Further, since the current measuring terminal 6 and the voltage measuring terminal 7 are formed in parallel, the width of the upper and lower surfaces 5a and 5b of the holder 5 is not increased, and the shadow loss due to the holder 5 is reduced in measuring the electrical characteristics. It can be kept low and the output can be prevented from decreasing. Even when the thickness of the finger electrode 3a varies, the probe pin 4 has a plurality of grooves on the surface of the contact portion 4b, so that the contact area between the probe pin 4 and the finger electrode 3a can be increased. This reduces the variation in the measured resistance value and enables stable output measurement.

  As shown in FIG. 9, the current measurement terminal 6 and the voltage measurement terminal 7 have the probe pins 4 partially overlapping in the arrangement direction. That is, the current measuring terminal 6 and the voltage measuring terminal 7 are such that the probe pins 4 are arranged in parallel along the long side direction of the lower surface 5b of the holder 5 and the width of the lower surface 5b of the holder 5 orthogonal to the arrangement direction. When viewed from the direction, the probe pins 4 are arranged so that the center of the contact portion 4b of the other probe pin 4 is positioned between the probe pins 4, and the distance S2 between the contact portions 4b is, for example, 0. It is arranged close to 1 mm.

  As a result, the current measuring terminal 6 and the voltage measuring terminal 7 are narrowed in the width direction of the lower surface 5b of the holder 5 by causing the contact portions 4b of the probe pins 4 to partially overlap when viewed from the arrangement direction. Can be arranged. Therefore, the width of the holder 5 in contact with the surface of the solar battery cell 2 is narrowed, and a decrease in output due to shadow loss can be prevented.

  For example, when the solar cell output measuring jig 1 is used for measuring the current-voltage characteristics of a 6-inch solar cell, the long sides of the upper and lower surfaces 5a and 5b of the holder 5 are the length of one side of the solar cell 2. The probe pins 4 constituting the current measuring terminal 6 are arranged in a straight line along the long side direction of the holder 5 with a distance of 0.1 mm and arranged in parallel therewith. Similarly, 42 probe pins 4 constituting the voltage measuring terminal 7 are arranged with an interval of 0.1 mm.

[Zigzag array]
In addition, as shown in FIG. 10, the solar cell output measuring jig 1 is configured such that both the current measuring terminal 6 and the voltage measuring terminal 7 are zigzag along the long side direction of the lower surface 5 b of the holder 5. Good. The current measurement terminal 6 and the voltage measurement terminal 7 are configured such that the abutting portions 4b of the adjacent probe pins 4 partially overlap in the direction orthogonal to the arrangement direction by arranging the probe pins 4 in each row in a zigzag manner. Can be made. That is, the current measuring terminals 6 are adjacent to each other when the probe pins 4 are arranged in a zigzag manner along the long side direction of the lower surface 5b of the holder 5 and viewed from the width direction of the lower surface 5b of the holder 5 orthogonal to the arrangement direction. The abutting portions 4b of the probe pins 4 are arranged so as to overlap each other. The voltage measurement terminal 7 is similarly configured. The spacing S3 between the contact portions 4b of the adjacent probe pins 4 is arranged close to 0.1 mm, for example.

  As described above, the current measuring terminal 6 and the voltage measuring terminal 7 have no gap across the arrangement direction by partially overlapping the contact portions 4b of the adjacent probe pins 4 in the direction orthogonal to the arrangement direction. . Therefore, according to the output measuring jig 1 for solar cells, as shown in FIG. 11, for example, a so-called bus bar-less structure in which only a plurality of finger electrodes 3a parallel to each other as the surface electrodes 3 are formed at a predetermined interval. In the measurement of the electrical characteristics of the solar battery cell 2, the current measurement terminal 6 and the voltage measurement terminal 7 can be brought into contact with all the finger electrodes 3a regardless of the interval between the finger electrodes 3a.

  In addition, the current measurement terminal 6 and the voltage measurement terminal 7 each adjust the overlap width W with the contact portion 4b of the adjacent probe pin 4, thereby narrowing the width of the holder 5 in contact with the surface of the solar battery cell 2. Therefore, it is possible to prevent a decrease in output due to shadow loss. That is, in the configuration in which the probe pins 4 are arranged in a zigzag manner, in order to increase the overlap width in the direction orthogonal to the arrangement direction, the adjacent probe pins 4 are moved in the width direction of the upper and lower surfaces 5a, 5b of the holder 5. However, it is necessary to make them close in the arrangement direction.

  However, when the probe pin 4 is moved in the width direction of the upper and lower surfaces 5a and 5b of the holder 5, the width of the holder 5 increases accordingly, and as a result, the area of the holder 5 covering the surface of the solar battery cell 2 increases and shadow loss occurs. This causes a decrease in output.

  On the other hand, the current measuring terminal 6 and the voltage measuring terminal 7 are spaced at intervals between the finger electrodes 3a as long as the current measuring terminal 6 and the voltage measuring terminal 7 are partially overlapped with the contact portions 4b of the adjacent probe pins 4 in the direction orthogonal to the arrangement direction. Can respond.

  Therefore, the current measurement terminal 6 and the voltage measurement terminal 7 are configured so that each finger electrode 3a has an overlap width W with the abutting portion 4b of the adjacent probe pin 4 less than a predetermined width, for example, 0.1 mm or less. The abutting portion 4b can be abutted in correspondence with the interval, and the width of the holder 5 can be narrowed to prevent a decrease in output due to shadow loss.

  For example, when the solar cell output measuring jig 1 is used for measuring the current-voltage characteristics of a 6-inch solar cell, the long sides of the upper and lower surfaces 5a and 5b of the holder 5 are the length of one side of the solar cell 2. The probe pins 4 constituting the current measuring terminal 6 are zigzag along the long side direction of the holder 5 with a 0.1 mm interval and 0.1 mm in the direction perpendicular to the arrangement direction. 45 are arranged with an overlap width W of 44, and 44 probe pins 4 constituting the voltage measuring terminal 7 are similarly arranged in parallel therewith at an interval of 0.1 mm.

  The contact portion 4b of the probe pin 4 may have any shape such as a triangular shape or a rhombus shape as shown in FIGS. Moreover, as shown in FIG. 14, the contact part 4b of the probe pin 4 may have a hemispherical tip. Of course, the tip may be flat.

  Note that the solar cell output measuring jig 1 is connected to each probe by connecting a cylinder jig (not shown) to the holder 5 and moving the holder 5 up and down in accordance with the operation of the cylinder jig, or manually. The pin 4 may be pressed perpendicularly to the surface electrode 3 of the solar battery cell 2.

[Method for measuring the output of solar cells]
Next, the measurement process of the electrical characteristics of the solar cell 2 using the solar cell output measuring jig 1 will be described.

  The measurement of the electrical characteristics of the solar cell 2 by the solar cell output measuring jig 1 is performed, for example, when the finger electrode 3a and the back electrode 22 are formed on the photoelectric conversion element. Specifically, the solar battery cell 2 is mounted on the mounting table 30 with the light receiving surface on which the finger electrodes 3a are formed facing upward. The mounting table 30 is formed, for example, by applying Au plating to a Cu plate, and is thereby electrically connected to the back electrode 22 of the solar battery cell 2.

  Next, as shown in FIG. 7, the solar cell output measuring jig 1 is arranged so that each of the probe pins 4 of the current measuring terminal 6 and the voltage measuring terminal 7 and all the finger electrodes 3a are orthogonal to each other. The current measuring terminal 6 and the voltage measuring terminal 7 are pressurized with a predetermined load by the load means that does not. At this time, the solar cell output measuring jig 1 is formed with the current measuring terminal 6 and the voltage measuring terminal 7 so that the contact portions 4b of the probe pins 4 are in contact with the finger electrodes 3a. Therefore, the current measuring terminal 6 can come into contact with all the finger electrodes, and the current characteristics can be measured with higher accuracy.

  Here, the total load on the current measuring terminal 6 and the voltage measuring terminal 7 by the load means is preferably in the range of 500 g to 3,000 g. If the total load is less than 500 g, the contact between the contact portion 4b of the probe pin 4 and the finger electrode 3a may be insufficient, leading to a decrease in output. If the total load exceeds 3,000 g, the probe pin 4 There is a possibility of damaging the electrode 3a or the solar battery cell 2.

  When the solar cell output measuring jig 1 is brought into contact with the cell surface, the circuit configuration as shown in FIGS. 15 and 16 is taken, and the solar light is irradiated onto the cell surface, so-called four-terminal method. Thus, the electrical characteristics of the solar battery cell 2 can be measured.

  Here, the solar cell output measuring jig 1 is formed such that the current measuring terminal 6 and the voltage measuring terminal 7 are formed in parallel, so that the width of the upper and lower surfaces 5a and 5b of the holder 5 is not increased. When measuring the electrical characteristics, the shadow loss due to the holder 5 can be kept low, and the output can be prevented from decreasing.

  Further, when the solar cell output measuring jig 1 in which the probe pins 4 in each row of the current measuring terminal 6 and the voltage measuring terminal 7 are arranged in a zigzag manner, the contact portions of the adjacent probe pins 4 are respectively contacted. By partially overlapping the 4b in a direction orthogonal to the arrangement direction, it is possible to eliminate a gap across the arrangement direction. Therefore, the current measurement terminal 6 can be brought into contact with all the finger electrodes 3a regardless of the interval between the finger electrodes 3a, and the current characteristics can be measured with higher accuracy.

  Moreover, in the solar cell output measuring jig 1 having the current measuring terminal 6 and the voltage measuring terminal 7 in such a zigzag arrangement, the overlap width with the contact portion 4b of each adjacent probe pin 4 is less than a predetermined width. For example, by setting it to 0.1 mm or less, the contact portion 4b can be contacted corresponding to the interval between all the finger electrodes 3a, and the width of the holder 5 can be narrowed to prevent a decrease in output due to shadow loss. This makes it possible to measure current-voltage characteristics with higher accuracy.

  Even when the thickness of the finger electrode 3a varies, the probe pin 4 has a plurality of grooves on the surface of the contact portion 4b, so that the contact area between the probe pin 4 and the finger electrode 3a can be increased. This reduces the variation in the measured resistance value and enables stable output measurement.

  The solar cell output measuring jig 1 to which the present invention is applied is an electric cell solar cell in which a bus bar electrode orthogonal to the finger electrode 3a is formed, in addition to the so-called bus bar-less solar cell 2 described above. It can also be used to measure characteristics. In this case, the solar cell output measuring jig 1 makes the current measurement terminal 6 and the voltage measurement terminal 7 abut on the bus bar electrode, but as described above, it can be measured without any problem even if it abuts on the finger electrode 3a. It is.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

  Next, an example in which each photoelectric conversion efficiency of the solar battery cell 2 having the bus bar-less structure is measured using the solar cell output measuring jig 1 to which the present invention is applied will be described.

(Bus barless structure solar cells)
The solar cell 2 having a bus barless structure used in this example has a 6-inch single crystal silicon photoelectric conversion element, and on the light receiving surface side, finger electrodes 3a having a width of 80 μm and a height of 20 μm to 30 μm are arranged at intervals of 2 mm. A plurality of Ag electrodes are formed on the back surface side. The finger electrodes are formed by screen printing using silver paste.

Example 1
The contact surface of the probe pin having a circular tip (diameter: 1.5 mm) is cut into a concentric circle at an angle of 60 °, an average depth of 45 μm, and an average interval (average pitch) between adjacent circles in the concentric circles. A 60 μm groove was formed (FIGS. 17A and 17B).

The probe pins in which the grooves were formed were embedded in a resin material (holder) and fixed so as to be arranged in a zigzag manner as shown in FIG. The base portions (socket portions) of the probe pins arranged in this way were bound to each other by being soldered to a copper wire to produce a solar cell output measuring jig.
One of the bound rows is a current measurement terminal, and the other row is a voltage measurement terminal. These terminals were used by connecting to a solar simulator.

(Example 2)
In Example 1, a solar cell output measuring jig was produced in the same manner as in Example 1 except that the average interval (average pitch) between adjacent concentric circles in the groove of the probe pin 4 was 120 μm. .
The average depth of the grooves was 95 μm.

(Example 3)
In Example 1, a solar cell output measuring jig was produced in the same manner as in Example 1 except that the average interval (average pitch) between adjacent concentric circles in the groove of the probe pin 4 was 250 μm. .
The average depth of the grooves was 210 μm.

(Comparative Example 1)
In Example 1, a solar cell output measuring jig was produced in the same manner as in Example 1 except that the groove was not formed in the contact portion 4b of the probe pin 4.

<Evaluation>
The obtained solar cell output measuring jig 1 was brought into contact with the solar cell 2 having a bus bar-less structure as shown in FIG. 19, and the resistance value between the probe pin and the finger electrode was measured. In addition, the resistance value at the time of 1A current application was measured.
The measurement was performed using a solar simulator (manufactured by Nisshinbo Mechatronics, PVS1116i) under conditions of illuminance of 1,000 W / m ² , temperature of 25 ° C., and spectrum AM of 1.5 G (JIS C8913). The measurement was performed five times, the arithmetic average value of the resistance value and the standard deviation (σ) were obtained, and the degree of variation for each measurement was examined. The measurement results were evaluated according to the following evaluation criteria.
[Evaluation criteria]
○: 1/3 or less of the standard deviation (σ) of the resistance value of Comparative Example 1.
(Triangle | delta): The standard deviation ((sigma)) or less of the resistance value of the comparative example 1 is more than 1/3.
X: The standard deviation (σ) of the resistance value is larger than that of Comparative Example 1.

When a plurality of grooves are provided in the contact portion of the probe pin (Examples 1 to 3), compared to a case where the contact portion of the probe pin does not have a plurality of grooves (Comparative Example 1), the measured resistance It was confirmed that the value was low and there was little variation in resistance value, and more stable output measurement was possible.
In particular, when the average interval (average pitch) between adjacent grooves is 40 μm to 150 μm (Examples 1 and 2), the variation in resistance value is very small (the standard deviation (σ) of the comparative example is a comparative example). 1/3 or less), and was very excellent.

  The solar cell output measuring jig of the present invention increases the contact area between the probe pin and the finger electrode, thereby reducing variations in the measured resistance value and enabling stable output measurement. Can be suitably used for output measurement.

DESCRIPTION OF SYMBOLS 1 Solar cell output measuring jig 2 Solar cell 3 Surface electrode 3a Finger electrode 4 Probe pin 4a Pin main body 4b Contact part 5 Holder 6 Current measurement terminal 7 Voltage measurement terminal 8 Ammeter 9 Voltmeter 22 Back electrode 30 Mounted Stand

Claims (5)

A plurality of probe pins are arranged, and a current measuring terminal for measuring the current characteristics of the solar battery cell,
A plurality of probe pins are arranged, and a voltage measuring terminal for measuring voltage characteristics of the solar battery cell;
A holder for holding the current measurement terminal and the voltage measurement terminal in parallel;
In the probe pins of the current measuring terminal and the voltage measuring terminal, the surface of the contact portion have a plurality of grooves in contact with the finger electrodes of the solar cells,
Wherein the plurality of groove shape of the output measurement jig solar cell, wherein a plurality of concentric der Rukoto of different diameters. The solar cell output measuring jig according to claim 1, wherein, in a plurality of concentric grooves having different diameters, an average interval between adjacent grooves is 30 μm to 300 μm. The solar cell output measuring jig according to claim 1, wherein the average depth of the grooves is 30 μm to 250 μm. A plurality of probe pins of the current measurement terminal are arranged in a zigzag,
The solar cell output measuring jig according to any one of claims 1 to 3, wherein a plurality of probe pins of the voltage measuring terminal are arranged in a zigzag manner. An arrangement step of arranging the current measurement terminal and the voltage measurement terminal of the output measuring jig for a solar battery cell according to any one of claims 1 to 4 on a finger electrode of the solar battery cell,
And a measuring step of measuring electrical characteristics of the solar cell while irradiating the surface of the solar cell with light.