JP2012074573A - Solar cell panel and artificial satellite incorporating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a solar cell panel capable of supplying large electric power is needed for an increasingly high-performance artificial satellite or spaceship and consequently is required to be able to deliver a higher output voltage, that when the output voltage of a solar cell panel increases, because the potential difference between the solar cells becomes greater, discharging of electricity between the solar cells energized by solar cell generated power becomes likely to occur, and that since discharging of electricity between the solar cells in a conventional solar cell panel was restricted by restricting the distance between the solar cells or shielding the interface between the solar cells with an insulator, there was a reduction in packaging efficiency, causing the output voltage to drop, or an increase in the weight of a solar cell panel was incurred.SOLUTION: Solar cells are disposed in divided blocks in order for the generated voltage to be below a permissible potential difference, each solar cell being connected in an oblique direction in order, so that the potential difference between any solar cells on a solar cell panel is made to be below a permissible value.

Description

  The present invention relates to a solar cell panel used in an artificial satellite, an airship, or the like, and more particularly to a solar cell panel having a solar cell arrangement structure that has a high output voltage and can suppress discharge between solar cells.

In recent years, a solar cell panel capable of supplying a large amount of electric power has been required with an increase in the performance of artificial satellites and spacecrafts, and accordingly, the output voltage of the solar cell panel needs to be increased.
When the output voltage of the solar cell panel increases, the potential difference between the solar cells increases, and therefore, discharge using the generated power of the solar cells as an energy source is likely to occur between the solar cells.

  As a means for preventing the discharge generated between the solar cells, the distance between adjacent solar cells is made larger than before, or an insulating material such as an RTV adhesive is filled in the gap between the solar cells, and the insulation barrier is formed. (See, for example, Patent Document 1).

  According to Patent Document 1 (FIG. 18 and the like), when the potential difference of one solar cell assembly row is set to V volts, adjacent solar cell assembly rows are connected in reverse directions, so The potential difference between the solar cells in the matching solar cell assembly row is the lowest at 0 volt at the lowest bottom, and the maximum at the top is 2 V, and the potential difference is the largest. This uppermost stage has the largest potential difference and is a portion having a high risk of causing electrostatic breakdown.

The smaller the potential difference between solar cells, the lower the risk of discharge between solar cells, indicating that if there is no insulation barrier between solar cells, it is safer if the voltage is at least ½ or less as compared to the case. (See Patent Document 1, Paragraph 0049).
Therefore, if a solar cell arrangement structure capable of reducing the potential difference between the solar cells can be realized, it is effective for preventing discharge between the solar cells.

  Moreover, in order to obtain a solar cell panel capable of supplying a large amount of power, it is necessary to efficiently attach the solar cell on the substrate of the solar cell panel. In general, a local part where a solar cell cannot be pasted on the substrate is generated due to restrictions on the mechanism of the solar panel, but if a solar panel can be pasted around this local part, the solar panel is more The output voltage can be increased.

Japanese Patent Laid-Open No. 11-274542

Conventionally, as a countermeasure against discharge in a solar cell panel, the distance between adjacent solar cells should be as large as possible, or an insulating material such as an RTV adhesive can be filled in the gap between solar cells and used as an insulation barrier. However, these methods have the following problems.
First, increasing the distance between the solar cells means that the mounting efficiency of the solar cells in the solar cell panel is lowered, and as a result, there is a problem that the output voltage of the solar cell panel is lowered.
Secondly, in the method of filling an insulating material such as an RTV adhesive in the gap between solar cells, the mass of the solar cell panel increases, and the cost increases due to the increased rocket launch cost. In the case where the insulating material is lost on the orbit, the energy source concentrates on the lost part, and the risk of discharge increases conversely.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a solar cell panel capable of supplying a large amount of power and suppressing discharge generated between solar cells. To do.

  The solar cell panel according to the present invention includes a plurality of solar cell strings each including a plurality of solar cell assembly rows made of solar cells and connection lines that electrically connect the solar cell assembly rows, and the solar cell. A solar cell panel including a substrate supporting a battery string, wherein the solar cell panel includes k solar cell assembly rows having a potential gradient in a first direction arranged in a row on the substrate. A battery assembly row group and k solar cell assembly rows adjacent to the first solar cell assembly row group and having a potential gradient in a second direction opposite to the first direction are arranged in a row. N solar cell assembly column group pairs each having a second solar cell assembly column group are arranged at positions that are mirror images of each other, and the solar cell string is connected to the first solar cell assembly. Each of the solar cell assembly columns arranged in a matrix of k rows × n columns in the yellow column group is in the diagonal direction in which the row number and column number of the matrix increase by 1. In the upper or lower row, the solar cell assembly columns forming the first solar cell assembly column group are connected to the assembly columns in order with the connection line. The solar cell assembly column that is connected to the solar cell assembly column that forms the solar cell assembly column group by the connection line, and the connected solar cell assembly column that forms the second solar cell assembly column group has the row number decreased by 1 and the column number is 1 It is formed by being connected by the connection line in order with the solar cell assembly row of the second solar cell assembly row group in the diagonal direction of the increasing reverse eye, and the second Each of the solar cell assembly columns arranged in a matrix of k rows × n columns in the solar cell assembly column group is connected to the solar cell assembly columns in the diagonal direction of the opposite eye by the connection line in order. In the upper or lower row, the solar cell assembly columns forming the second solar cell assembly column group are the solar cell assembly columns of the first solar cell assembly column group in the adjacent solar cell assembly column group pair. The solar cell assembly row connected by the connection line and forming the connected first solar cell assembly row group is the solar cell assembly row of the first solar cell assembly row group in the forward oblique direction. Are connected in order by the connection line.

  According to the solar cell panel of the present invention, discharge generated between solar cells can be suppressed without increasing the distance between the solar cells and without filling the gap between the solar cells with an insulator. It is possible to provide a solar cell panel capable of supplying high power with high performance.

1 is a top view of a solar cell panel 100 according to a first embodiment. 1 is a schematic perspective view illustrating a solar battery cell 1 according to a first embodiment. 1 is a perspective view illustrating a configuration of a solar cell panel 100 according to a first embodiment. FIG. 3 is a diagram of symbols displaying the solar cell assembly row 30 according to the first embodiment. FIG. 3 is a diagram showing an arrangement of solar cell assembly rows 30 of the solar cell panel 100 according to the first exemplary embodiment. In the solar cell panel 100 (k = n = 4) concerning Embodiment 2, it is the figure which wired the solar cell assembly row | line | column 30 arrange | positioned by the eight solar cell strings 40. FIG. In the solar cell panel 100 (k = 2, n = 4) concerning Embodiment 3, it is the figure which wired the solar cell assembly row | line | column 30 arrange | positioned by the four solar cell strings 40. FIG. It is the figure which showed an example of the solar cell panel 100 (k = n = 4) concerning Embodiment 4. FIG. It is the figure which showed an example of the solar cell panel 100 (k = n = 4) concerning Embodiment 5. FIG.

Embodiment 1 FIG.
FIG. 1 is a top view of solar cell panel 100 according to Embodiment 1 of the present invention. The solar cell panel 100 includes a solar cell panel substrate 10 and a plurality of solar cell assembly rows 30 arranged on the solar cell panel substrate 10 and electrically connected thereto. The solar cell assembly rows 30 are electrically connected by a connection line.
Hereinafter, with reference to the drawings, the arrangement of the solar cell assembly rows 30 arranged on the solar cell panel substrate 10 according to a certain rule, and these solar cell assembly rows are electrically connected by connection lines in a certain procedure. The solar cell string 40 thus manufactured will be described.

FIG. 2 is a schematic perspective view showing the solar battery cell 1. The solar cell 1 includes a semiconductor substrate 2 for photovoltaic power generation, a light receiving surface electrode 3 provided on the solar light receiving surface of the semiconductor substrate 2 for collecting current generated in the semiconductor substrate 2, and a semiconductor substrate 2 And a bar electrode 4 connected to one end of each light receiving surface electrode 3 and for collecting and collecting the current collected by the light receiving surface electrode 3. Although not shown, a front surface electrode is provided on the back surface of the semiconductor substrate 2.
The semiconductor substrate 2 has a p-type semiconductor layer and an n-type semiconductor layer, and has a rectangular shape or the like obtained by cutting a square or a corner of the square into a triangle. A diode element for preventing a backflow of current is connected to a corner cut out in a triangular shape.

FIG. 3 is a perspective view showing the configuration of the solar cell panel 100.
One end of the interconnector 6 is connected to a surface electrode (not shown) on the back surface side of the solar battery cell 1, and the other end of the interconnector 6 is connected to the bar electrode 4 of the solar battery cell 1 to be connected. A cover glass 8 is bonded to the light receiving surface side of the solar battery cell 1 with an adhesive 7. By connecting the interconnector 6 to the solar battery cell 1, the plurality of solar battery cells 1 are electrically connected to each other in series.
The solar cells 1 connected in series by the interconnector 6 are fixed to the upper surface of the solar cell panel substrate 10 with an adhesive or the like.
The solar cell panel substrate 10 normally has a sandwich structure in which the upper and lower surfaces of the core 11 that is the core material of the solar cell panel substrate 10 are sandwiched between the skins 12. The core 11 has a honeycomb structure that is lightweight and has high strength. The skin 12 is composed of a composite material sheet using carbon fibers. An insulating layer 13 is provided on the skin 12 on the front side of the solar cell panel substrate 10 (the side on which the solar cells 1 are disposed). For the insulating layer 13, a polyimide film having excellent heat resistance and the like is used because it can withstand use in a space environment.

Here, an assembly of solar cells 1 in which α solar cells 1 as shown in FIG. 3 are connected in series by an interconnector 6 is referred to as a solar cell assembly row 30.
Assuming that the output voltage per solar cell 1 is u volt, a maximum output voltage V = α · u volt is generated in one solar cell assembly row 30.
Here, the notation of FIG. 4 is used to represent a solar cell assembly row 30 in which α solar cells 1 are connected in series. In the notation of FIG. 4, “a” represents the positive electrode (+) terminal of the solar cell assembly row 30, and “b” represents the negative electrode (−) terminal of the solar cell assembly row 30. The letters “V” and “0” written inside the rectangles representing the solar cell assembly row 30 in FIG. 4 are the voltages of the positive terminal a and the negative terminal b, respectively. The maximum output voltage is V = α · u. “V”> “0”, and the voltage gradient is from the positive (+) terminal to the negative (−) terminal.

  This solar cell assembly row 30 is electrically connected in series with another solar cell assembly row 30 via a connection line, and a solar cell string 40 is produced. When the k solar cell assembly rows 30 are connected in series, the maximum output voltage of the solar cell string 40 is V = k · α · u volts. Conductive wiring, metal fittings, etc. are examples of connection lines.

FIG. 5 is a diagram showing an example of the arrangement of solar cell assembly rows 30 in the solar cell panel of the first embodiment.
Solar cell assembly columns 30 of k rows × 2n columns (pieces) (k, n ≧ 2) are arranged on the insulating layer 13 of the solar cell panel substrate 10.

In the arrangement of the solar cell assembly rows 30 shown in FIG. 5, k solar cell assembly rows 30 are arranged in the rightmost row (first row), and the positive electrode terminals a are arranged on the upper side of the solar cell panel 100 in FIG. Is positioned so that the polarity is such that the negative electrode terminal b is positioned on the lower side. That is, each solar cell assembly row 30 is arranged in a potential difference direction (voltage gradient) in which the upper terminal voltage is V volts and the lower terminal voltage is 0 volts.
Here, the arrangement in which the solar cell assembly rows 30 are arranged in the direction of the potential difference (the direction of the voltage gradient) is referred to as an a arrangement.

Thus, in the rightmost row (first row) on the solar cell panel substrate 10, the a-array solar cell assembly rows 30 are arranged in a row in the vertical direction. Hereinafter, the first row of solar cell assembly rows 30 is referred to as a “1Sa row group”.
Then, the individual solar cell assembly rows 30 of the k solar cell assembly rows 30 constituting the 1Sa row group are referred to as 1Sa_1, 1Sa_2, 1Sa_3, 1Sa_4,. Distinguish by.
Note that the individual solar cell assembly columns 1Sa_1, 1Sa_2, 1Sa_3, 1Sa_4,..., 1Sa_k in the “1Sa column group” shown in FIG. The electrical connection between the solar cell assembly rows will be described later. The 1Sa_1 solar cell assembly row 30 is also referred to as a solar cell assembly row 30 at the reference position of the matrix.

Next, in the solar cell panel 100 of FIG. 5, in the column on the left side (second column) of the 1Sa column group, the potential difference in the solar cell assembly column 30 is opposite to that in the first column (arrangement). The k solar cell assembly rows are arranged in a direction in which the gradient is reversed.
That is, each solar cell assembly row 30 is arranged with a voltage gradient in which the voltage at the upper terminal is 0 volts and the voltage at the lower terminal is V volts. Here, the arrangement in which the solar cell assembly rows 30 are arranged in the direction of the potential difference is referred to as b arrangement.

Thus, the solar cell assembly row 30 of b arrangement | sequence is arrange | positioned in the vertical direction in the left adjacent row | line | column (2nd row | line) of the rightmost side of the solar cell panel board | substrate 10 at 1 row.
Hereinafter, the solar cell assembly row 30 in the first row is referred to as a “1Sb row group”.
The individual solar cell assembly rows 30 of the k solar cell assembly rows 30 constituting the 1Sb row group are referred to as 1Sb_1, 1Sb_2, 1Sb_3, 1Sb_4,. Distinguish by.
In addition, each solar cell assembly row | line | column 1Sb_1, 1Sb_2, 1Sb_3, 1Sb_4, ..., 1Sb_k of "1Sb row group" shown in FIG. 5 has shown the state arrange | positioned on the solar cell panel, There is no electrical connection between the solar cell assembly rows.

  Here, the “1Sa column group” and the “1Sb column group” adjacent to the 1Sa column group are referred to as “solar cell assembly column group pair 1S” (see FIG. 5).

On the left side of this “solar cell assembly column group pair 1S” (FIG. 5), a solar cell assembly column group pair having an array that has a mirror image relationship with “solar cell assembly column group pair 1S” is arranged.
That is, the “2Sb column group” having the same arrangement (b arrangement) as the “1Sb column group” of the second column is arranged in the third column, and the “1Sa column group” of the first column is arranged in the fourth column. “2Sa column group” having the same array (a array) is arranged. In this way, the solar cell rows having the arrangement in the first row and the second row in the mirror image relationship are arranged in the third row and the fourth row. This “2Sa column group” and “2Sb column group” are referred to as a “solar cell assembly column group pair 2V”.

Similarly, “solar cell assembly column group pair 3 </ b> S” having an array that has a mirror image relationship with “solar cell assembly column group pair 2 </ b> V” is arranged on the left side of “solar cell assembly column group pair 2 </ b> V”. The
Thereafter, “solar cell assembly column group pair 3V”, which is arranged in a mirror image with “solar cell assembly column group pair 3S”, is repeatedly arranged on the left side of “solar cell assembly column group pair 3S”. Thus, “solar cell assembly column group pair nV” is arranged at the leftmost end (see FIG. 5).

  In this way, on the top surface of the solar cell panel substrate 10, the “1Sa column group”, “1Sb column group”, “2Sb column group”, “ “2Sa column group”, “3Sa column group”, “3Sb column group”, “4Sb column group”, “3Sa column group”,... (Omitted), “(n−1) Sa column group”, “ (N−1) Sb column group ”,“ nSb column group ”, and“ nSa column group ”are arranged. In one column group, k solar cell assembly columns 30 are arranged in the row direction (vertical direction).

  On the other hand, if this arrangement is described using column group pairs, “1S column group pair”, “2V column group pair”, “3S column group” are sequentially arranged on the upper surface of the solar cell panel substrate 10 from the right end to the left end. A pair of column groups of “pair”,... (Omitted), “(n−1) S column group pair” and “nV column group pair” are arranged.

As described above, each of the solar cell assembly columns 30 arranged in a matrix on the solar cell panel substrate 10 is expressed by [XSh_Y] (X: arrangement) using the column group number, the potential difference arrangement, and the row number. Column group number (X = 1, 2,..., N) of the arranged solar cell assembly row, h: direction of voltage gradient of the solar cell assembly row (h = a or b), Y: arranged solar cell assembly It is specified by the column row number (= 1, 2,..., K)).
For example, the solar cell assembly column 30 corresponding to the third (third row) from the bottom of the solar cell panel substrate 10 in the 1Sa column group is specified by [1Sa — 3]. Further, the solar cell assembly column 30 corresponding to the fifth (fifth row) from the bottom of the solar cell panel substrate 10 in the 2Sb column group is specified by [2Sb_5] (see FIG. 5).

  Next, in the solar cell assembly row 30 arranged as shown in FIG. 5, the positive terminal a and the negative terminal b of each solar cell assembly row 30 are connected to the negative terminal b and the positive terminal a of the other solar cell assembly row 30. A solar cell string 40 in which n solar cell assembly rows 30 are connected in series is manufactured by electrically connecting in series using a line.

  Hereinafter, as an example, a wiring example in which the return (−) terminal, the solar cell assembly row 30 and the hot (+) end of the solar cell panel are wired by the solar cell string 40 when k = n is shown below.

[Ι] For the solar cell string 40 including the solar cell assembly row [1Sa_Po] (Po = 1, 2,..., K) of the 1Sa row group respectively connected to the return (−) terminal:

The solar cell assembly rows 30 are connected by a connection line by the following steps.
Step IV-1.
As shown below, in the Sa column group, the column group number is one above and the row number is one above, and the solar cell assembly column of the Sa column group located diagonally above is connected in series (in this way A solar cell assembly column having a column number one higher and a row number one higher is referred to as a solar cell assembly column in the “slanting direction”.
However, if there is no solar cell to be connected in series (a solar cell in the Sa column group located one diagonally above the row number and one row number above), the next step Ι− 2. Move on.
Solar cell connection:
[(1 + i) Sa_ (Po + i)] and [(2 + i) Sa_ (Po + i + 1)]
(Where i = 0, 1, 2, ...)

Step IV-2.
When the solar cell to be connected reaches the solar cell at the upper end (solar cell with row number k), it is connected in series with the solar cell in the Sb column group with the row number one higher and the row number k.
Solar cell connection:
[(K−Po + 1) Sa_k] and [(k−Po + 2) Sb_k]
(Where i is a value satisfying (Po + i + 1) = k, i = k−Po + 1)

Step IV-3.
Next, in the Sb column group, the Sb column group is connected in series with the solar cell of the Sb column group located diagonally below, with the column group number being one higher and the row number being one lower. The solar cell assembly row in which the row number is one up and the row number is one down in the direction is referred to as a solar cell assembly row in the “diagonal direction of the reverse eye”).
[(K−Po + 2 + i) Sb_k−i] and [(k−Po + 3 + i) Sb_ (k− (i + 1))]
(Where i = 0, 1, 2,...).

Step IV-4.
When a solar cell to be connected reaches a solar cell at the lower end of the array (a solar cell with a row number of 1), it is connected in series with a solar cell in the Sa column group having the column group number one higher.
Solar cell connection:
[(2k-Po + 1) Sb_1] and [(2k-Po + 2) Sa_1]
(Here, the value of i is a value satisfying (k− (i + 1)) = 1, i = k−2)

Step IV-5.
As described below, the solar cell is connected in series with the solar cell in the Sa column group located diagonally above and adjacent to the upper row number by one in the Sa column group.
Solar cell connection:
[(2k−Po + 2 + i) Sa_ (1 + i)] and [(2k−Po + 3 + i) Sa_ (2 + i)] (where i = 0, 1, 2,...).

Step IV-6.
V-2. Steps ~~ -5 are repeated until the connected solar cells reach the n-row group pair solar cells. Note that Ι-2. When the solar cell to be connected reaches the n-row group pair solar cell in the process of ˜Ι-5, the next step Ι-7. Move on.

Step IV-7.
V-6. The solar cell in the n-row group pair connected in step 1 and the hot terminal of the solar cell are connected.

Thus, step Ι-1. -Step IV-7. Thus, k solar cell strings 40 having an output voltage of approximately n × V volts are obtained by connecting the solar cells in the Sa column group in series.

[II] Regarding the solar cell string 40 including the solar cell assembly column [1Sb_Po] (Po = 1, 2,..., K) of the 1Sb column group respectively connected to the return (−) terminal:
The solar cells are connected by the following steps.

The solar cell assembly rows 30 are connected by a connection line by the following steps.
Step II-1.
As described below, the Sb column group is connected in series with the Sb column group solar cell located diagonally below and having the column group number one higher and the row number one lower. However, if there is no solar cell to be connected in series (the solar cell in the Sb column group located one diagonally adjacent with the row number one higher and the row number one lower), the next step II- 2. Move on.
Solar cell connection:
[(1 + i) Sb_ (Po−i)] and [(2 + i) Sb_ (Po−i−1)]
(Where i = 0, 1, 2, ...)

Step II-2.
When the solar cell to be connected reaches the solar cell at the lower end (solar cell with a row number of 1), it is connected in series with the solar cell of the Sa column group with a row number of 1 and a row number of 1.
Solar cell connection:
[(Po) Sb_1] and [(Po + 1) Sa_1]
(Here, the value of i is a value satisfying (Po−i−1) = 1, i = Po−2)

Step II-3.
Next, in the Sa column group, the solar cell is connected in series with the solar cell in the Sa column group located diagonally above and adjacent to the row number by one in the Sa column group.
[(Po + 1 + i) Sa_1 + i] and [(Po + 2 + i) Sa_ (2 + i))]
(Where i = 0, 1, 2,...).

Step II-4.
When the solar cell to be connected reaches the solar cell at the upper end of the array (solar cell with row number k), it is connected in series with the solar cell in the Sb column group with the column number one higher and the row number k. .
Solar cell connection:
[(Po + k) Sa_k] and [(Po + k + 1) Sb_k]
(Where i is a value satisfying (2 + i) = k, i = k−2)

Step II-5.
As described below, the Sb column group is connected in series with the Sb column group solar cell located diagonally below and having the column group number one higher and the row number one lower.
Solar cell connection:
[(Po + k + 1 + i) Sb_ (k−i)] and [(Po + k + 2 + i) Sb_ (k−i−1)] (where i = 0, 1, 2,...).

Step II-6.
II-2. Steps II-5 are repeated until the connected solar cell reaches the n-row group pair solar cells. II-2. In the process of II-5, if the already connected solar cells reach the n-row group pair solar cells, the next step II-7. Move on.

Step II-7.
II-6. The solar cell in the n-row group pair connected in step 1 and the hot terminal of the solar cell are connected.

Thus, step II-1. -Step II-7. Thus, k solar cell strings 40 having an output voltage of approximately n × V volts are obtained by connecting the solar cells in the Sb column group in series.

  FIG. 1 shows that when the number of solar cell rows k is equal to the number of column groups n (k = n), each solar cell assembly column 30 of the solar cell panel shown in FIG. -Step IV-7. And Step II-1. -Step II-7. It is an example of the solar cell panel which showed the total 2k solar cell string 40_1 to 40_2k obtained by connecting by.

As shown in FIG. 1, the potential at each positive electrode end of each solar cell assembly row 30 in the solar cell panel 100 in which the solar cell assembly rows 30 are arranged is 0 volts, V volts, 2 V as shown in FIG. Volt, 3V or 4V.
As can be seen from the figure, the maximum potential difference in the solar cell assembly rows included in the same solar cell assembly row group pair is V volts.
Further, the potential difference between the adjacent solar cells between the adjacent solar cell assembly row groups is always kept at V volts or less because the polarities of the adjacent solar cell assembly row groups are the same.

  As described above, according to the solar cell panel 100 according to the first embodiment, the potential difference between the ends of the adjacent solar cell assembly rows can be suppressed to V volts or less, and thus the discharge between the solar cells can be suppressed.

Embodiment 2. FIG.
In Embodiment 2, an example of a solar cell in the case where k = n = 4 will be described as an example in the solar cell panel of Embodiment 1. FIG.
FIG. 6 is a diagram showing connection of solar cell assembly rows 30 when k = n = 4 in the solar cell panel of the first embodiment.
The solar cell panel 30 is provided with 32 (= k × (2 × n)) solar cell assembly rows, and each solar cell assembly row 30 is connected as follows to constitute a solar cell string 40. To do.

(1) Solar cell string 40_1;
(Return end)-[1Sa_1]-[2Sa_2]-[3Sa_3]-[4Sa_4]-(Hot end)
(2) Solar cell string 40_2;
(Return end)-[1Sa_2]-[2Sa_3]-[3Sa_4]-[4Sb_4]-(Hot end)
(3) Solar cell string 40_3;
(Return end)-[1Sa_3]-[2Sa_4]-[3Sb_4]-[4Sb_3]-(Hot end)
(4) Solar cell string 40_4;
(Return end)-[1Sa_4]-[2Sb_4]-[3Sb_3]-[4Sb_4]-(Hot end)
(5) Solar cell string 40_5;
(Return end)-[1Sb_4]-[2Sb_3]-[3Sb_2]-[4Sb_1]-(Hot end)
(6) Solar cell string 40_6;
(Return end)-[1Sb_3]-[2Sb_2]-[3Sb_1]-[4Sa_1]-(Hot end)
(7) Solar cell string 40_7;
(Return end)-[1Sb_2]-[2Sb_1]-[3Sa_1]-[4Sa_2]-(Hot end)
(8) Solar cell string 40_8;
(Return end)-[1Sb_1]-[2Sa_1]-[3Sa_2]-[4Sa_3]-(Hot end)

  As described above, according to the solar cell panel 100 according to the second embodiment, the potential difference between the ends of the adjacent solar cell assembly rows can be suppressed to V volts or less, so that the discharge between the solar cells can be suppressed.

Embodiment 3 FIG.
In Embodiment 3, the case where k = 2 and n = 4 in the solar cell panel of Embodiment 1 will be described.
FIG. 7 is a diagram showing connection of solar cell assembly rows 30 when k = 2 and n = 4 in the solar cell panel of the first embodiment.
Sixteen solar cell assembly rows are arranged on the solar cell panel 30, and each solar cell assembly row is connected as follows to constitute a solar cell string 40.

(1) Solar cell string 40_1;
(Return end)-[1Sa_1]-[2Sa_2]-[3Sb_2]-[4Sb_1]-(hot end)
(2) Solar cell string 40_2;
(Return end)-[1Sa_2]-[2Sb_2]-[3Sb_1]-[4Sa_1]-(Hot end)
(3) Solar cell string 40_3;
(Return end)-[1Sb_2]-[2Sb_1]-[3Sa_1]-[4Sa_2]-(Hot end)
(4) Solar cell string 40_4;
(Return end)-[1Sb_1]-[2Sa_1]-[3Sa_2]-[4Sb_2]-(hot end)

  As described above, according to the solar cell panel 100 according to the third embodiment, the potential difference between the ends of the adjacent solar cell assembly rows can be suppressed to V volts or less, so that the discharge between the solar cells can be suppressed.

Embodiment 4 FIG.
In the fourth embodiment, the effect of offsetting the rotational force acting on the solar cell panel 100 will be described.
FIG. 8 is a top view of the solar cell panel 100 according to Embodiment 4 of the present invention. In the arrangement of the solar cell assembly row 30 described in FIG. 1 of Embodiment 1, k = 4 and n = 4. It is a representation.
In the solar cell panel of FIG. 8, eight solar cell strings 40 are wired. That is, the solar cell string 40 including the solar cell assembly column 1Sa_1 connected to the return (−) terminal (herein, the solar cell string 40_a1; the same applies hereinafter), the solar cell string 40_a2 including 1Sa_2, and the solar cell including 1Sa_3. 8 of the solar cell string 40_b4 including the solar cell string 40_b3 including 1Sb_3, the solar cell string 40_b2 including 1Sb_3, the solar cell string 40_b1 including 1Sb_2, the solar cell string 40_b1 including the battery string 40_a4 and 1Sb_1 The solar cell strings 40 are wired.

Here, the solar cell string 40_a1 and the solar cell string 40_b4 are paired, and the solar cell string 40_a2 and the solar cell string 40_b3, the solar cell string 40_a3 and the solar cell string 40_b2, and the solar cell string 40_a4 and the solar cell string 40_b1 are paired. Then, a solar cell string route that always passes through the solar cell assembly column of the row number that is the line symmetry position within the same solar cell column group pair with respect to the center line of the solar cell panel shown in FIG.
For example, when considering the solar cell string 40_a1 and the solar cell string 40_b4, the solar cell string 40_a1 and the solar cell string 40_b4 are each in the same solar cell array group pair with respect to the center line of the solar cell panel 100 shown in FIG. It passes through the solar cell assembly rows 1Sa_1 and 1Sb_4 which are in line-symmetrical positions.
As described above, the solar cell string pair described above always passes through the solar cell assembly column of the row number which is a line symmetrical position within the same solar cell column group pair with respect to the center line of the solar cell panel. Since the string route is configured, the magnetic moments generated by the respective current loops generated by the power generation of the solar cell strings cancel each other.

Normally, when a rotational force is generated in a solar cell panel due to a magnetic moment, it is necessary to stabilize the posture by injecting gas from a nozzle connected to a gas tank mounted on a satellite in order to cancel the rotational force. As another method, in order to cancel out the magnetic moment generated in the solar cell string, the solar cell string generates the magnetic moment generated by the current flowing in the wiring route connected to the satellite body on the back surface of the solar cell panel. It was necessary to make a detour to cancel out the generated magnetic moment. As a result, the wiring weight increases and the launch cost for launching the satellite into orbit increases, but in the solar panel of the present embodiment, the magnetic moments generated by the current loop flowing through the solar cell string cancel each other. As a result, the overall magnetic moment applied to the panel can be reduced to a substantially zero value.
As described above, since the overall magnetic moment applied to the panel can be reduced in the solar cell panel of the present embodiment, the attitude of the satellite can be stabilized without performing special operations such as gas injection. In addition, a wiring bypass route that cancels out the magnetic moment of the entire solar cell panel is not required, and the panel weight can be reduced, so that an increase in launch vehicle cost due to an increase in satellite weight can be avoided.

  In the above description, the case where k = 4 and n = 4 in the arrangement of the solar cell assembly row 30 described in FIG. 1 has been described as an example. However, the present invention is not limited to this case, and k and n are other values. Even in this case, the same effect can be obtained.

Embodiment 5 FIG.
In the fifth embodiment, even if there is an obstacle or the like in which the solar cell assembly row 30 cannot be arranged in one region of the solar cell panel described in the first to fourth embodiments, this obstacle is avoided. However, a solar cell panel that can suppress variations in output voltage between a plurality of solar cell strings will be described.

As one of the mechanisms possessed by the satellite, a solar cell panel having a solar cell disposed on the surface thereof and a deployable solar cell panel formed by connecting the yokes to each other by a hinge incorporating a deployment spring, There is a mechanism called a hold-down mechanism that is folded and stored in the satellite body, maintains the state, and is released by a deployment signal.
In the satellite having the hold-down mechanism, a mechanism hole is formed in one region of the solar cell panel in order to maintain the folded state of the solar cell panel.

  If a hole is formed in the solar cell panel, the solar cell cannot be attached to a place with the hole. Since a solar cell cannot be attached, the output voltage of a specific solar cell string among a plurality of solar cell strings becomes low, and a large potential difference occurs between the output voltage of other solar cell strings connected in parallel. In such a case, there arises a problem that means for compensating the potential difference must be taken.

FIG. 9 is an example showing the arrangement of solar cell assembly rows 30 when obstacles (holes) are arranged in a row in a part of the solar cell panel in the fifth embodiment.
In the fifth embodiment, a solar cell assembly row 30b in which the size of the solar cell assembly row 30 is reduced so as not to overlap the obstacle (hole) at a place where the obstacle (hole) of the solar cell panel is present, The solar cell assembly row 30b is pasted onto the solar cell panel substrate 10. And the solar cell assembly row | line | column 30 is electrically wired similarly to Embodiment 1-4, and a solar cell string is comprised.

  Thus, in the solar cell panel according to the fifth embodiment, the solar cell assembly row 30 is reduced in size so that it does not overlap the obstacle (hole) and does not cover the obstacle (hole). 30b was prepared, and the solar cell string was configured by electrically wiring the solar cell assembly row 30 in an oblique direction as in the first to fourth embodiments.

  By doing in this way, the fall of the output voltage by having an obstruction (hole) can be disperse | distributed to the several solar cell string 40, without concentrating on a specific solar cell string. As a result, it is possible to avoid the occurrence of a large potential difference between the output voltage of a specific solar cell string among a plurality of solar cell strings and the output voltage of other parallel-connected solar cell strings. it can.

  The solar cell panels shown in FIG. 1 and FIGS. 5 to 9 are examples, and the arrangement of the solar cell assembly rows 30 is a horizontally inverted version of the arrangement shown in FIG. 1 and FIGS. It may be reversed.

  DESCRIPTION OF SYMBOLS 1 Solar cell, 2 Semiconductor substrate, 3 Light-receiving surface electrode, 4 Bar electrode, 6 Interconnector, 7 Adhesive, 8 Cover glass, 10 Solar cell panel board, 11 Core, 12 Skin, 13 Insulation layer, 30 Solar cell assembly Row, 40 solar cell string, 100 solar cell panel.

Claims (3)

A plurality of solar cell strings composed of a plurality of solar cell assembly rows composed of solar cells, and a connection line for electrically connecting the solar cell assembly rows, and a substrate for supporting the solar cell strings. Solar panel,
On the substrate, a first solar cell assembly row group in which k solar cell assembly rows having a potential gradient in a first direction are arranged in a row, and adjacent to the first solar cell assembly row group A second solar cell assembly row group in which k solar cell assembly rows having a potential gradient in a second direction opposite to the first direction are arranged in a row. The battery assembly row group pair is disposed at a position where they are mirror images of each other,
The solar cell string is
Each of the solar cell assembly columns arranged in a matrix of k rows × n columns in the first solar cell assembly column group has an order in which the row number and the column number of the matrix increase by 1. It is connected by the connection line in order with the solar cell assembly row in an oblique direction,
In the upper end or lower end row, the solar cell assembly column forming the first solar cell assembly column group forms the second solar cell assembly column group in the adjacent solar cell assembly column group pair. The solar cell assembly columns that are connected by the connection line and form the connected second solar cell assembly column group are in the reverse diagonal direction in which the row number decreases by 1 and the column number increases by 1. Formed by being connected to the solar cell assembly row of the solar cell assembly row group of 2 in order by the connection line,
Further, each of the solar cell assembly columns arranged in a matrix of k rows × n columns in the second solar cell assembly column group is arranged in order with the solar cell assembly columns in the diagonal direction of the reverse eye. Connected by connecting lines,
In the upper or lower row, the solar cell assembly columns forming the second solar cell assembly column group are the solar cell assembly columns of the first solar cell assembly column group in the adjacent solar cell assembly column group pair. The solar cell assembly row connected by the connection line and forming the connected first solar cell assembly row group is the solar cell assembly row of the first solar cell assembly row group in the forward oblique direction. The solar cell panel is formed by being connected by the connection line in order. The solar cell panel is formed with a hole for a deployment mechanism in which the solar cell panel is stored in a folded state and deployed by a deployment signal.
The solar cell assembly row is arranged so that a small size solar cell assembly row is arranged around the hole as compared with other solar cell assembly rows arranged so as not to cover the hole for the deployment mechanism. The solar cell panel according to claim 1, characterized in that: An artificial satellite equipped with the solar cell panel according to claim 1.

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