Solar cell unit and solar cell module

Abstract

The invention provides a solar cell unit and a solar cell module which can reduce the number of components and improve yield compared with the prior art. The present invention is configured so as to have a first power generation region, a second power generation region, a first current collection wiring section capable of conducting with the first power generation region, a second current collection wiring section capable of conducting with the second power generation region, and a through-hole section, the first current collection wiring section being provided independently of the second current collection wiring section without being continuous with the second current collection wiring section. And a through part that includes one or a plurality of through-holes, that extends in the direction in which the first current collection wiring part extends, that partitions the first power generation region and the second power generation region, and that restricts conduction between the first power generation region and the second power generation region, and that is disposed so as to be spaced apart from the second current collection wiring part across the through part.

Description

Technical Field

[0001] The present invention relates to a solar cell unit and a solar cell module. Background Art

[0002] In recent years, a transparent solar cell module that is used as a window glass and allows light to pass through in the thickness direction has been known (for example, Patent Document 1).

[0003] For example, in the transparent solar cell module of Patent Document 1, a plurality of solar cell units divided into rectangles are arranged at intervals in a checkerboard pattern, and the solar cell units adjacent in the vertical direction are connected by an interconnector. Thus, light can pass through in the thickness direction from the gaps in the left-right direction between the solar cell units.

[0004] Patent Document 1: International Publication No. 2020 / 189240

[0005] However, for the solar cell module of Patent Document 1, since the solar cell panel being processed is cut into small pieces and the solar cell units are connected together by an interconnector, there are problems that the cutting process of the solar cell units becomes cumbersome, the yield is low, and the cost is high.

[0006] In addition, for the solar cell module of Patent Document 1, each solar cell unit is small and the number thereof is large, so the solar cell units sometimes shift during sealing. Therefore, measures need to be taken for alignment of the solar cell units.

[0007] Thus, there is room for further improvement in the solar cell module of Patent Document 1. Summary of the Invention

[0008] Therefore, an object of the present invention is to provide a solar cell unit and a solar cell module that can reduce the number of components and improve the yield compared to the prior art.

[0009] A solar cell unit according to one aspect of the present invention for solving the above problems includes: a first power generation region; a second power generation region; a first current collection wiring portion capable of conducting with the first power generation region; a second current collection wiring portion capable of conducting with the second power generation region; and a through portion. The first current collection wiring portion is not connected to the second current collection wiring portion but is independently provided, and is arranged at an interval from the second current collection wiring portion with the through portion therebetween. The through portion includes one or more through holes, extends along the extending direction of the first current collection wiring portion to divide the first power generation region and the second power generation region, and restricts conduction between the first power generation region and the second power generation region.

[0010] According to this configuration, the first power generation region and the second power generation region are divided by the through portion, and small pieces of solar cells are formed analogously in one solar cell unit. Therefore, the number of components can be reduced, and the yield can be increased compared to the case of cutting a solar cell panel during processing as in Patent Document 1, and the cost can be reduced.

[0011] According to this configuration, light can pass through in the thickness direction through the through portion, and thus it can be applied to a transparent solar cell module.

[0012] In a preferred configuration, the aperture ratio of the above-mentioned through portion is 10% or more and 90% or less.

[0013] In a preferred configuration, the above-mentioned first current collecting wiring portion and the above-mentioned second current collecting wiring portion each have: a plurality of finger electrode portions extending in the extending direction of the through portion; and a bus bar electrode portion connecting one end side of the plurality of finger electrode portions, and a part of the through portion is located between the bus bar electrode portion of the first current collecting wiring portion and the bus bar electrode portion of the second current collecting wiring portion.

[0014] According to this configuration, the through portion is formed up to between the bus bar electrodes closer to the end portion, and it is possible to limit the conduction between the first power generation region and the second power generation region while increasing the aperture ratio.

[0015] However, the transparent solar cell module of Patent Document 1 generates electricity through the entire solar cell unit. Therefore, when any of the solar cell units constituting the solar cell string cannot generate electricity due to hot spots or the like, the entire string to which the solar cell unit belongs cannot generate electricity. In the case of Patent Document 1, each solar cell unit is extremely small. Therefore, even if a column of solar cell strings cannot generate electricity, the decrease in the power generation area is small.

[0016] However, in the case of a normal solar cell module, the solar cell unit has a certain size. Therefore, when one solar cell unit cannot generate electricity, the power generation area of the solar cell module decreases significantly.

[0017] Therefore, the solar cell module according to one configuration of the present invention has a plurality of the above-mentioned solar cell units, the solar cell units are directly or connected via a conductive member, and in the solar cell unit, there are a first solar cell unit and a second solar cell unit. The first solar cell unit is configured such that the first current collecting wiring portion is connected to the first current collecting wiring portion of the second solar cell unit, and the second current collecting wiring portion is connected to the second current collecting wiring portion of the second solar cell unit.

[0018] According to this configuration, the first power generation regions of the first and second solar cell units, and the second power generation regions of the first and second solar cell units can be substantially independently electrically connected respectively. Therefore, even if it is assumed that the first power generation region of the first solar cell unit is short-circuited and cannot generate electricity, electricity can still be generated on the second power generation region side of the first solar cell unit. Therefore, compared with the case of using the entire solar cell unit for power generation, a decrease in the power generation area can be suppressed.

[0019] In addition, a solar cell module according to one aspect of the present invention includes a plurality of the above-described solar cell units, and a solar cell string formed by directly or via a conductive member connecting a plurality of the above-described solar cell units in series. The solar cell string is configured such that the first current collecting wiring portion of the solar cell unit between the solar cell unit on the most upstream side and the solar cell unit on the most downstream side in the direction of electric current flow is connected to the first current collecting wiring portion of the adjacent solar cell unit, and the second current collecting wiring is connected to the second current collecting wiring portion of the adjacent solar cell unit.

[0020] According to this configuration, among the solar cell units between the solar cell unit on the most upstream side and the solar cell unit on the most downstream side in the direction of electric current flow, the first and second power generation regions of the adjacent solar cell units can be electrically connected separately. Therefore, even if the first power generation region in the solar cell unit is short-circuited and cannot generate electricity, electricity can still be generated on the second power generation region side. Compared with the case of using the entire solar cell unit for power generation, a decrease in the power generation area can be suppressed.

[0021] However, for the transparent solar cell module of Patent Document 1, the gap between adjacent solar cell units is wider than the interval between the finger electrode portions within the solar cell unit. Therefore, when a non-ferrous metal layer is used for the finger electrode portions, light is reflected at each finger electrode portion in the solar cell unit, and light is not reflected in the gap between the solar cell units. As a result, the gap between the solar cell units is obvious, and the solar cell module looks uneven. When used as a window glass, it sometimes causes a sense of incongruity.

[0022] A solar cell module according to one embodiment of the present invention includes a plurality of the above-described solar cell units. The solar cell units are directly or indirectly connected via conductive members. Among the solar cell units, there are a first solar cell unit and a second solar cell unit. The first solar cell unit has a first side, and the first current collecting wiring portion extends along the first side. The second current collecting wiring portion extends at an interval from the first current collecting wiring portion and in the extending direction of the first current collecting wiring portion. The first solar cell unit is configured such that the through portion is located between the first current collecting wiring portion and the second current collecting wiring portion and extends in the extending direction of the first current collecting wiring portion. The second solar cell unit has a second side that extends substantially parallel to the first side of the first solar cell unit and a third current collecting wiring portion that extends along the second side, and is arranged at an interval from the first solar cell unit. The interval between the first current collecting wiring portion and the second current collecting wiring portion is 0.9 times or more and 1.1 times or less the interval between the first current collecting wiring portion and the third current collecting wiring portion of the second solar cell unit. The distance between the first side of the first solar cell unit and the second side of the second solar cell unit is 0.9 times or more and 1.1 times or less the width of the through portion.

[0023] Here, the so-called "substantially parallel" means substantially parallel, that is, the inclination angle of the other side with respect to one side is less than 3 degrees. That is, the "second side that extends substantially parallel to the first side" means the second side with an inclination angle less than 3 degrees with respect to the first side, and also includes the case where the second side is parallel to the first side.

[0024] According to this embodiment, the interval between the first current collecting wiring portion and the second current collecting wiring portion in the first solar cell unit and the interval between the first current collecting wiring portion of the first solar cell unit and the third current collecting wiring portion of the second solar cell unit are substantially equal, and the interval of the gap between the first solar cell unit and the second solar cell unit is substantially equal to the width of the through portion formed by the through hole. Therefore, light can be transmitted uniformly. As a result, the overall appearance of the solar cell module looks substantially uniform, and it is not likely to cause a sense of incongruity when used as a window glass.

[0025] A solar cell module according to one aspect of the present invention includes a plurality of solar cell units, which are directly or indirectly connected via conductive members. Each of the plurality of solar cell units includes: a first power generation region; a second power generation region; a first current collection wiring portion capable of conducting with the first power generation region; a second current collection wiring portion capable of conducting with the second power generation region; and a conduction limiting portion that divides the first power generation region and the second power generation region and limits conduction between the first power generation region and the second power generation region. Among the plurality of solar cell units, there are a first solar cell unit and a second solar cell unit. The first solar cell unit is configured such that the first current collection wiring portion is independent of the second current collection wiring portion and is connected to the first current collection wiring portion of the second solar cell unit, and the second current collection wiring portion is connected to the second current collection wiring portion of the second solar cell unit.

[0026] According to this aspect, since there is a conduction limiting portion that divides the first power generation region and the second power generation region within the solar cell unit and limits conduction, the first power generation region and the second power generation region can generate electricity substantially independently. Therefore, compared with the case of cutting a solar cell panel during processing as in Patent Document 1, the number of components can be reduced, the yield can be improved, and the cost can be reduced.

[0027] According to this aspect, the first power generation region of the first solar cell unit and the first power generation region of the second solar cell unit, and the second power generation region of the first solar cell unit and the second power generation region of the second solar cell unit can be conducted substantially independently. Therefore, even if it is assumed that the first power generation region of the first solar cell unit cannot generate electricity due to hot spots or the like, power can be generated on the side of the second power generation region of the first solar cell unit. Therefore, compared with the case of using the entire solar cell unit to generate electricity, a decrease in the power generation area can be suppressed.

[0028] A solar cell module according to one aspect of the present invention includes a first solar cell unit and a second solar cell unit. The first solar cell unit has a first side and includes: a first current collecting wiring portion extending along the first side; a second current collecting wiring portion spaced apart from the first current collecting wiring portion and extending along the extending direction of the first current collecting wiring portion; and a through portion located between the first current collecting wiring portion and the second current collecting wiring portion and formed by one or more through holes extending along the extending direction of the first current collecting wiring portion. The through portion is a conduction limiting portion that limits conduction between the first current collecting wiring portion side and the second current collecting wiring portion side in the first solar cell unit. The second solar cell unit is disposed at a distance from the first solar cell unit. The second solar cell unit has: a second side extending substantially parallel to the first side of the first solar cell unit; and a third current collecting wiring portion extending along the second side. The distance between the first current collecting wiring portion and the second current collecting wiring portion is 0.9 times or more and 1.1 times or less the distance between the first current collecting wiring portion and the third current collecting wiring portion. The distance between the first side of the first solar cell unit and the second side of the second solar cell unit is 0.9 times or more and 1.1 times or less the width of the through portion.

[0029] According to this aspect, the distance between the first current collecting wiring portion and the second current collecting wiring portion in the first solar cell unit and the distance between the first current collecting wiring portion of the first solar cell unit and the third current collecting wiring portion of the second solar cell unit are substantially equal. The distance between the first solar cell unit and the second solar cell unit is substantially equal to the width of the conduction limiting portion formed by the through holes. Therefore, light can pass through evenly. As a result, the overall appearance of the solar cell module looks substantially uniform, and it is not likely to cause a sense of disharmony when used as a window glass.

[0030] According to this aspect, in the first solar cell unit, the first current collecting wiring portion side and the second current collecting wiring portion side can generate electricity substantially independently. Therefore, compared with the case of cutting a solar cell panel during processing as in Patent Document 1, the number of components can be reduced, the yield can be improved, and the cost can be reduced.

[0031] As long as the above aspects are included within the technical scope of the present invention, the aspects can be subordinate to each other, a part of the structure can be cited, and a part of the structure can be replaced.

[0032] The solar cell unit and the solar cell module according to the present invention can reduce the number of components and improve the yield compared with the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a perspective view of a solar cell module according to a first embodiment of the present invention.

[0034] Figure 2 is Figure 1 A top view of the solar cell module, and the first light-transmissive substrate and the first sealing material are omitted for ease of understanding.

[0035] Figure 3 is Figure 1 A cross-sectional view of the solar cell module, wherein Figure 3 (a) of Figure 2 is a sectional view taken along line A-A of Figure 3 (b) of Figure 2 is a sectional view taken along line B-B of Figure 3 For ease of understanding, the shading of the sealing material is omitted in both (a) and (b) of

[0036] Figure 4 is Figure 2 An explanatory view of the solar cell unit, wherein Figure 4 (a) of Figure 4 is a perspective view observed from the side of the first light-transmissive substrate, Figure 4 (b) of

[0037] Figure 5 is Figure 2 An explanatory view of the solar cell string, wherein Figure 5 (a) of Figure 5 is a top view showing the relationship of the power generation regions of the respective solar cell units,

[0038] Figure 6 is a top view showing the relationship of the solar cell units adjacent longitudinally in Figure 2

[0039] Figure 7 A perspective view of the solar cell unit according to another embodiment of the present invention.

[0040] Figure 8 A top view of the solar cell module according to another embodiment of the present invention.

[0041] Figure 9 An explanatory view of the solar cell string according to another embodiment of the present invention, wherein Figure 9 (a) of Figure 9 is a top view of the solar cell string in which the through holes are arranged at the vertices of an equilateral triangle, Detailed implementation mode

[0042] Hereinafter, embodiments of the present invention will be described in detail.

[0043] The solar cell module 1 of the first embodiment of the present invention is mainly suitable for use as a window glass and is a transparent solar cell module that allows light to pass through in the thickness direction. In addition, the solar cell module 1 is a double-sided light-receiving type solar cell module that can convert the light energy incident from both main surface sides into electric energy.

[0044] As Figure 1 such, the solar cell module 1 is mainly erected relative to the horizontal plane and is appropriately installed on a window frame or the like in a vertical posture in which the vertical direction is the longitudinal direction Y and the horizontal direction is the lateral direction X. Therefore, in the following description, unless otherwise specified, the description will be based on the Figure 1 posture.

[0045] As Figure 1 such, the solar cell module 1 includes translucent substrates 2 and 3, a solar cell group 5 (5a to 5d), a first extraction wiring 6 (6a to 6d), a second extraction wiring 7 (7a to 7d), a first sealing material 8, and a second sealing material 9.

[0046] In the solar cell module 1, a plurality of solar cell groups 5 and extraction wirings 6 and 7 are arranged between the two translucent substrates 2 and 3, and the gap between the translucent substrates 2 and 3 is filled and sealed with the sealing materials 8 and 9.

[0047] (Translucent substrates 2 and 3)

[0048] The translucent substrates 2 and 3 are translucent members that extend in a planar shape and allow light to pass through in the thickness direction.

[0049] As Figure 1 such, the translucent substrates 2 and 3 of the present embodiment are plate-like bodies having a quadrilateral shape extending in the lateral direction X and the longitudinal direction Y.

[0050] The translucent substrates 2 and 3 are members having translucency and insulation properties, and for example, a translucent insulating substrate such as a glass substrate can be used.

[0051] (Solar cell group 5)

[0052] As Figures 1 to 3 such, the solar cell group 5 (5a to 5d) includes a plurality of solar cell units 20 and a conductive adhesive material 21, and is a series connection group in which the plurality of solar cell units 20 are connected in series via the conductive adhesive material 21.

[0053] (Solar cell unit 20)

[0054] As Figure 4 andFigure 5 As such, the solar cell unit 20 includes a photoelectric conversion substrate 30, a first collector electrode 31 (31a to 31h), a second collector electrode 32 (32a to 32h), a through portion 33 (33a to 33g), and a power generation region 35 (35a to 35h).

[0055] As Figure 4 such, the solar cell unit 20 has a quadrilateral shape when viewed from above, and includes horizontal sides 36, 37 extending along the horizontal direction X and vertical sides 38, 39 extending along the vertical direction Y.

[0056] The solar cell unit 20 of the present embodiment is square, the horizontal sides 36, 37 are parallel to each other, and the vertical sides 38, 39 are parallel to each other.

[0057] As Figure 4 such, the photoelectric conversion substrate 30 is a plate-shaped substrate having a first main surface 45 and a second main surface 46 as two main surfaces, and is a portion that converts light energy into electric energy.

[0058] The photoelectric conversion substrate 30 is formed by laminating a semiconductor layer on a semiconductor substrate, and has a PN junction between the semiconductor substrate and the semiconductor layer.

[0059] The solar cell unit 20 of the present embodiment is a crystalline solar cell unit using a crystalline silicon substrate as the semiconductor substrate.

[0060] As Figure 4 shown in (a) of [], the first collector electrode 31 is a conductive layer provided on the first main surface 45 side and partially laminated on the photoelectric conversion substrate 30.

[0061] The first collector electrode 31 is composed of a first bus electrode portion 50 and a plurality of first finger electrode portions 51 (51a, 51b).

[0062] The first collector electrode 31 is not particularly limited as long as it has conductivity, and may be formed of a metal such as gold, silver, aluminum, copper, palladium or a metal alloy thereof, for example.

[0063] As Figure 4 shown in (a) of [], each of the first collector electrodes 31a to 31h is independently provided alone and is not directly connected to each other.

[0064] The first bus electrode portion 50 is provided on one end portion (the end portion on the vertical side 38 side) in the horizontal direction X when viewed from above, is a connecting portion that connects the end portions of the first finger electrode portions 51a, 51b, and extends along the vertical direction Y.

[0065] The first bus electrode portion 50 functions as a pad for connecting to the second bus electrode portion 60 of an adjacent solar cell unit 20 via a conductive adhesive material 21.

[0066] The width (length in the longitudinal direction Y) of the first bus electrode portion 50 is not particularly limited, and is preferably 1 mm or more and 8 mm or less.

[0067] The first finger electrode portions 51a and 51b are linear electrode portions that extend parallel to the transverse sides 36 and 37 from the middle portion in the longitudinal direction Y of the first bus electrode portion 50 toward the other end portion (the end portion on the longitudinal side 39 side) in the transverse direction X.

[0068] The first finger electrode portions 51a and 51b are arranged in parallel at intervals in the longitudinal direction Y, and both extend from the first bus electrode portion 50 near one end portion (the end portion on the longitudinal side 38 side) in the transverse direction X to near the other end portion (the end portion on the longitudinal side 39 side). That is, the first finger electrode portions 51a and 51b extend in a manner that crosses the photoelectric conversion substrate 30 in the transverse direction X when viewed from above.

[0069] The widths of the first finger electrode portions 51a and 51b are narrower than the width of the first bus electrode portion 50, and are preferably 30 μm or more and 70 μm or less.

[0070] As Figure 4 shown in (b) of , the second collector 32 is a conductive layer provided on the second main surface 46 side and partially laminated on the photoelectric conversion substrate 30.

[0071] The second collector 32 is composed of a second bus electrode portion 60 and a plurality of second finger electrode portions 61 (61a, 61b).

[0072] The second collector 32 is not particularly limited as long as it has conductivity, and for example, it can be composed of a metal such as gold, silver, aluminum, copper, palladium, or a metal alloy thereof.

[0073] Each of the second collectors 32a to 32h is independently and separately provided, and is not directly connected to each other.

[0074] The second bus electrode portion 60 is provided on the other end portion (the end portion on the longitudinal side 39 side) side in the transverse direction X, is a connecting portion that connects the end portions of the second finger electrode portions 61a and 61b, and extends along the longitudinal direction Y.

[0075] The second bus electrode portion 60 is a portion that functions as a pad for connecting the first bus electrode portion 50 of the adjacent solar cell unit 20 via the conductive adhesive material 21.

[0076] The width (length in the longitudinal direction Y) of the second bus electrode portion 60 is not particularly limited, and is preferably 1 mm or more and 8 mm or less.

[0077] The second finger-shaped electrode portions 61a and 61b are linear electrode portions that extend parallel to the transverse sides 36 and 37 from the middle portion on the longitudinal Y of the second bus bar electrode portion 60 toward one end portion on the transverse X (the end portion on the side of the longitudinal side 38). That is, the second finger-shaped electrode portions 61a and 61b extend in a direction opposite to that of the first finger-shaped electrode portion 51a provided on the first main surface 45 side.

[0078] The second finger-shaped electrode portions 61a and 61b are arranged side by side at intervals in the longitudinal Y, and both extend from the second bus bar electrode portion 60 near the other end portion on the transverse X (the end portion on the side of the longitudinal side 39) to near the one end portion (the end portion on the side of the longitudinal side 38).

[0079] That is, similar to the first finger-shaped electrode portions 51a and 51b, the second finger-shaped electrode portions 61a and 61b extend in a manner that crosses the photoelectric conversion substrate 30 in the transverse X.

[0080] The width of the second finger-shaped electrode portions 61a and 61b is narrower than the width of the second bus bar electrode portion 60, and is preferably 30 μm or more and 70 μm or less.

[0081] As Figure 5 shown, the through portion 33 is a conduction restriction portion (conductive restriction portion) that extends along the transverse X to divide the adjacent power generation regions 35, 35 in the longitudinal Y and restricts the conduction between the power generation regions 35, 35.

[0082] The through portion 33 is a portion that penetrates the photoelectric conversion substrate 30 in the thickness direction and allows light to pass through in the thickness direction of the solar cell unit 20, and is a through hole group in which a plurality of through holes 70 are arranged in a columnar shape and side by side at equal intervals in the transverse X.

[0083] The opening shape of the through hole 70 is not particularly limited, and may be a polygonal shape such as a triangle, a quadrilateral, a pentagon, or a hexagon, or may be a circular shape, an elliptical shape, or a groove shape.

[0084] The opening shape of the through hole 70 in the present embodiment is circular.

[0085] The through portion 33 is preferably Figure 6 as shown, the shortest distance d1 between the adjacent through holes 70, 70 in the transverse X is 0.1 mm or more and 2 mm or less.

[0086] The through portion 33 preferably has a portion where the adjacent power generation regions 35, 35 in the longitudinal Y are connected between the through holes 70, 70.

[0087] As Figure 6 shown, the diameter d3 of the minimum circumscribed circle of the through hole 70 is preferably 0.1 mm or more and 2 mm or less.

[0088] The so-called "minimum circumscribed circle diameter" here refers to the smallest circle that includes all parts inside. The minimum circumscribed circle diameter of the through-hole 70 refers to the smallest circle that includes the entire opening of the through-hole 70 inside.

[0089] Preferably, the intervals d2 between the through-holes 70, 70 adjacent in the longitudinal direction Y of the through portion 33 are equal intervals.

[0090] Preferably, the solar cell unit 20 has an opening ratio of the through portion 33 of 10% or more and 90% or less.

[0091] The so-called "opening ratio" here refers to the ratio of the area of the opening to the total area when viewed from above.

[0092] The power generation area 35 is a power generation area capable of generating electricity by receiving light, and is an area where the through-hole 70 is not formed.

[0093] The power generation area 35 is an area divided by the through portion 33 and arranged in parallel in the longitudinal direction Y, and extends along the transverse direction X.

[0094] Figure 5 The power generation areas 35a, 35h located at both ends in the longitudinal direction Y shown in (a) are areas outside the through portion 33 in the longitudinal direction Y, and the remaining power generation areas 35b to 35g are areas between the through portions 33, 33 arranged in parallel in the longitudinal direction Y.

[0095] As Figure 5 shown, each of the power generation areas 35a to 35h is correspondingly arranged with each of the collector electrodes 31, 32, and can be respectively conducted with each of the collector electrodes 31, 32.

[0096] (Conductive adhesive material 21)

[0097] The conductive adhesive material 21 is a conductive component having conductivity, and is an adhesive material that connects the bus bar electrode portions 50, 60 of the solar cell units 20, 20 adjacent in the transverse direction X.

[0098] The conductive adhesive material 21 of the present embodiment is a conductive adhesive film provided with conductive adhesive materials on both sides of a conductive film.

[0099] (Take-out wirings 6, 7)

[0100] As Figure 1 , Figure 2 shown, the take-out wirings 6, 7 extend from between the light-transmitting substrates 2, 3 along the inside and outside, and are wirings for taking out the power generated from each solar cell group 5 to the outside.

[0101] The first take-out wiring 6 is in a comb shape and can be adhered to each first bus bar electrode portion 50 of the solar cell unit 20 directly or via a conductive adhesive material.

[0102] That is, the first extraction wiring 6 can make each first bus electrode portion 50 have the same potential by connecting to each first bus electrode portion 50 of the solar cell unit 20.

[0103] Each of the first extraction wirings 6a to 6d is provided independently and is separately connected to a terminal box (not shown).

[0104] The second extraction wiring 7 is in a comb shape and can be bonded to each second bus electrode portion 60 of the solar cell unit 20 directly or via a conductive adhesive material.

[0105] That is, the second extraction wiring 7 can make each second bus electrode portion 60 have the same potential by connecting to each second bus electrode portion 60 of the solar cell unit 20.

[0106] Each of the second extraction wirings 7a to 7d is provided independently and is separately connected to a terminal box (not shown).

[0107] (Sealing materials 8, 9)

[0108] The sealing materials 8 and 9 have sealing properties, are components that seal the solar cell stack 5 together with the light-transmissive substrates 2 and 3, and are also adhesive materials that bond between the light-transmissive substrates 2 and 3.

[0109] Next, the positional relationship of each part of the solar cell module 1 of the present embodiment will be described.

[0110] For the solar cell module 1, as Figure 1 , Figure 2 shown, a plurality of solar cell stacks 5 are arranged in parallel at intervals in the longitudinal direction Y (vertical direction), and a gap is formed between the adjacent solar cell stacks 5 and 5 in the longitudinal direction Y.

[0111] For the solar cell module 1, Figure 6 the interval D1 (the shortest distance between the horizontal sides 37 and 36) between the solar cell units 20A and 20B of the adjacent solar cell stacks 5 and 5 shown in the longitudinal direction Y is preferably 0.9 times or more and 1.1 times or less of the diameter d3 (the width of the through portion 33) of the minimum circumscribed circle diameter of the through hole 70, and more preferably equal to the diameter d3.

[0112] For the solar cell module 1, Figure 6The interval D2 between the bus electrode portions 50, 50 (60, 60) adjacent in the longitudinal direction Y of the respective solar cell units 20A, 20B shown is preferably 0.9 times or more and 1.1 times or less of the interval D3 between the bus electrode portion 50A (60A) closest to the lateral side 37 in the solar cell unit 20A and the bus electrode portion 50B (60B) closest to the lateral side 36 in the solar cell unit 20B, and more preferably equal to the interval D3.

[0113] For the solar cell module 1, the aperture ratio based on the through-holes 33 of the respective solar cell units 20 and the gaps between the solar cell groups 5, 5 is preferably 10% or more and 90% or less.

[0114] For the solar cell unit 20a, as Figure 3 shown in (a) of Figure 5 and (b) of

[0115] each collector 32 is not connected to other collectors 32 adjacent in the longitudinal direction Y, but is connected to the respective collectors 31 of the adjacent solar cell unit 20b. For the solar cell unit 20b, each collector 32 is not connected to other collectors 32 adjacent in the longitudinal direction Y, but is connected to the respective collectors 31 of the adjacent solar cell unit 20c. Figure 5 As

[0116] shown in (a) of

[0117] each power generation region 35a to 35h of the solar cell unit 20b is electrically connected to the respective power generation regions 35a to 35h of the solar cell unit 20a adjacent in the lateral direction X and is electrically connected to the respective power generation regions 35a to 35h of the solar cell unit 20c.

[0118] That is, the first power generation region 35a on the collector 31a side and the second power generation region 35b on the collector 31b side are physically separated by the through portion 33, and the chips of the solar cell are formed analogously in one solar cell unit 20. Therefore, it is possible to improve the yield while reducing the number of components compared to the prior art, and to reduce costs. In addition, since the number of components can be reduced, it is easy to keep the interval of the solar cell modules 5 constant, and from a distance, the gaps between the through portion 33 and the solar cell modules 5, 5 can be made of the same tone.

[0119] In the solar cell module 1 according to the first embodiment, light can pass through in the thickness direction through the through portion 33 of each solar cell unit 20 and the gaps between the solar cell units 20, 20 adjacent in the longitudinal direction Y. Therefore, it can function as a transparent solar cell module.

[0120] In the solar cell module 1 according to the first embodiment, as Figure 6 shown, a part of the through hole 70 of the through portion 33 is located between the bus bar electrode portions 50(60) of the collector 31a (first current collecting wiring portion) and the bus bar electrode portions 50(60) of the collector 31b (second current collecting wiring portion). Therefore, the through portion 33 can be provided near the longitudinal sides 38, 39 in the lateral direction X, and the conduction between the first power generation region 35a and the second power generation region 35b can be further restricted.

[0121] In the solar cell module 1 according to the first embodiment, as Figure 5 shown, for the first solar cell unit 20b between the solar cell unit 20a on the most upstream side and the solar cell unit 20c on the most downstream side in the direction of electric current flow, the collector 31a on the first main surface 45 side is not connected to the collector 31b adjacent in the longitudinal direction Y, but is connected to the collector 32a on the second main surface 46 side of the second solar cell unit 20a, and the collector 31b on the first main surface 45 side is connected to the collector 32b on the second main surface 46 side of the second solar cell unit 20a.

[0122] In addition, for the first solar cell unit 20b, the collector 32a on the second main surface 46 side is not connected to the collector 32b adjacent in the longitudinal direction Y, but is connected to the collector 31a on the first main surface 45 side of the third solar cell unit 20c, and the collector 32b on the second main surface 46 side is connected to the collector 31b on the first main surface 45 side of the third solar cell unit 20c.

[0123] That is, the first power generation regions 35a of the second solar cell unit 20a, the first power generation regions 35a of the first solar cell unit 20b, and the first power generation regions 35a of the third solar cell unit 20c are connected in series electrically, and the second power generation regions 35b of the second solar cell unit 20a, the second power generation regions 35b of the first solar cell unit 20b, and the second power generation regions 35b of the third solar cell unit 20c are connected in series electrically.

[0124] Therefore, in the solar cell module 1 according to the first embodiment, the first power generation regions 35a of the respective solar cell units 20a to 20c and the second power generation regions 35b of the respective solar cell units 20a to 20c can be conducted substantially independently. Therefore, even if it is assumed that the first power generation region 35a of the first solar cell unit 20b is short-circuited and cannot generate electricity, it is possible to generate electricity on the side of the second power generation region 35b of the first solar cell unit 20b. Therefore, compared with the case of using the entire solar cell unit 20 for power generation, a decrease in the power generation area can be suppressed.

[0125] In the solar cell module 1 according to the first embodiment, as Figure 6 such, the interval D2 between the collector 31 (first current collecting wiring portion) and the collector 31 (second current collecting wiring portion) adjacent in the longitudinal direction Y in the solar cell unit 20A (20B) is 0.9 times or more and 1.1 times or less of the interval D3 between the collector 31 (first current collecting wiring portion) closest to the lateral side 37 in the solar cell unit 20A and the collector 31 (third current collecting wiring portion) closest to the lateral side 36 in the solar cell unit 20B.

[0126] In addition, in the solar cell module 1 according to the first embodiment, when viewed from above, the lateral side 37 (first side) of the solar cell unit 20A is parallel to the lateral side 36 (second side) of the solar cell unit 20B, and the distance D1 between the lateral side 37 of the first solar cell unit 20A and the lateral side 36 of the second solar cell unit 20B is 0.9 times or more and 1.1 times or less of the width d3 of the through portion 33.

[0127] That is, for the solar cell module 1, the intervals between the collectors 31 adjacent in the longitudinal direction Y are equally spaced, and the interval of the gap between the solar cell unit 20A and the solar cell unit 20B is equal to the width of the through portion 33 formed by the through hole 70. Therefore, light can be transmitted evenly. As a result, the overall appearance of the solar cell module 1 looks substantially uniform, and it is not likely to cause a sense of incongruity when used as a window glass.

[0128] In the above-described embodiment, the first collector 31 includes two first finger electrode portions 51a and 51b, but the present invention is not limited thereto. The number of the first finger electrode portions 51 constituting the first collector 31 is not particularly limited. The first collector 31 may also include three or more first finger electrode portions 51 as Figure 7 shown. Similarly, the second collector 32 includes two second finger electrode portions 61a and 61b, but the present invention is not limited thereto. The number of the second finger electrode portions 61 constituting the second collector 32 is not particularly limited. The second collector 32 may also include three or more second finger electrode portions 61.

[0129] In the above-described embodiment, eight power generation regions 35 are defined by seven through-holes 33, but the present invention is not limited thereto. The power generation regions 35 may be defined by one or more and six or less through-holes 33, or may be defined by eight or more through-holes 33.

[0130] By changing the number of the through-holes 33 in this way and changing the number of the through-holes 70 constituting the through-holes 33, the aperture ratio of the solar cell module 1 can be adjusted.

[0131] In the above-described embodiment, the solar cell groups 5a to 5d are connected in parallel to a terminal box (not shown) connected to an external load, but the present invention is not limited thereto. As Figure 8 shown, the solar cell groups 5a to 5d may also be connected by connection wirings 80a to 80c to form a series connection group, and the most upstream solar cell group 5a and the downstream solar cell group 5c of the series connection group may be connected to extraction wirings 6 and 7 and connected in series to the terminal box. In this case, the solar cell groups 5 and 5 (for example, solar cell groups 5a and 5b) adjacent in the longitudinal direction Y are arranged in a front-back inverted configuration. That is, the positive and negative directions of the solar cell groups 5 and 5 adjacent in the longitudinal direction Y are different from each other.

[0132] In the above-described embodiment, the through-hole 33 is configured such that the through-holes 70 are arranged in a line, but the present invention is not limited thereto. The through-hole 33 may also be configured such that the through-holes 70 are arranged in multiple lines.

[0133] In this case, the through-holes 70 and 70 adjacent in the longitudinal direction Y may be offset in the lateral direction X as shown in Figure 9 (a) thereof, or may be arranged in a straight line in the longitudinal direction Y as shown in Figure 9 (b) thereof.

[0134] The through-hole 33 is preferably configured to fill the planar figure formed by connecting the centers of adjacent through-holes 70.

[0135] For the through-hole 33, it may be as Figure 9The figure formed by connecting the centers of the most adjacent through-holes 70 is an equilateral triangle as shown in (a) of Figure 9 or a square as shown in (b) of

[0136] In the above-described embodiment, each solar cell group 5 is composed of three solar cell units 20a to 20c, but the present invention is not limited thereto. As long as the number of solar cell units 20 constituting any one solar cell group 5 is two or more, the number of solar cell units 20 constituting other solar cell groups 5 is not particularly limited.

[0137] In the above-described embodiment, the solar cell module 1 is composed of four solar cell groups 5a to 5d, but the present invention is not limited thereto. The solar cell module 1 may also be composed of one or more and three or less solar cell groups 5, or may be composed of five or more solar cell groups 5.

[0138] In the above-described embodiment, the through portion 33 is composed of a plurality of through-holes 70, but the present invention is not limited thereto. The through portion 33 may also be composed of one through-hole 70. In addition, in the solar cell unit 20, adjacent power generation regions 35, 35 may be connected in part, and the end portions in the extending direction of the through portion 33 may also be composed of cut portions. That is, a part of the through portion 33 may also be a cut portion extending in the lateral direction X from the end portions constituting the longitudinal sides 38, 39.

[0139] In the above-described embodiment, the case where the solar cell unit 20 is a crystalline solar cell unit has been described, but the present invention is not limited thereto. The solar cell unit 20 may also be other types of solar cell units.

[0140] In the above-described embodiment, for the solar cell module 1, the solar cell groups 5 are arranged in the longitudinal direction Y (vertical direction), but the present invention is not limited thereto. The solar cell groups 5 may also be arranged in the lateral direction X (horizontal direction). In this case, it is preferable to rotate the solar cell module 1 by 90 degrees so that it is horizontally and vertically reversed.

[0141] In the above-described embodiment, the solar cell units 20, 20 belonging to the solar cell group 5 and adjacent in the lateral direction X are connected by the conductive adhesive material 21, but the present invention is not limited thereto. They may also be connected by other conductive components such as wirings.

[0142] As long as the above-described embodiments are included in the technical scope of the present invention, the respective components can be freely replaced and added between the respective embodiments.

[0143] Explanation of reference numerals

[0144] 1... solar cell module; 20, 20a to 20c, 20A, 20B... solar cell units (first solar cell unit, second solar cell unit); 21... conductive adhesive material; 31, 31a to 31h... first collector electrode (first current collecting wiring portion, second current collecting wiring portion, third current collecting wiring portion); 32, 32a to 32h... second collector electrode (first current collecting wiring portion, second current collecting wiring portion, third current collecting wiring portion); 33... through portion (conductance limiting portion); 35, 35a to 35h... power generation region (first power generation region, second power generation region); 36... horizontal side (second side); 37... horizontal side (first side); 50, 50A, 50B... first bus bar electrode portion; 51, 51a, 51b... first finger electrode portion; 60, 60A, 60B... second bus bar electrode portion; 61, 61a, 61b... second finger electrode portion; 70... through hole.

Claims

1. A solar cell unit, wherein, the solar cell unit has: a first power generation region; a second power generation region; a first current collecting wiring portion capable of conducting with the first power generation region; a second current collecting wiring portion capable of conducting with the second power generation region; and a through portion, the first current collecting wiring portion is not continuous with the second current collecting wiring portion but is provided independently, and is arranged at an interval from the second current collecting wiring portion with the through portion therebetween, the through portion includes one or more through holes, extends along the extending direction of the first current collecting wiring portion to divide the first power generation region and the second power generation region, and restricts the conduction between the first power generation region and the second power generation region.

2. The solar cell unit according to claim 1, wherein, the opening ratio based on the through portion is 10% or more and 90% or less.

3. The solar cell unit according to claim 1 or 2, wherein, the first current collecting wiring portion and the second current collecting wiring portion each have: a plurality of finger electrode portions extending along the extending direction of the through portion; and a bus bar electrode portion connecting one end side of the plurality of finger electrode portions, a part of the through portion is located between the bus bar electrode portion of the first current collecting wiring portion and the bus bar electrode portion of the second current collecting wiring portion.

4. A solar cell module having a plurality of the solar cell units according to claim 1 or 2, wherein, the solar cell module has a solar cell string formed by directly connecting or connecting via a conductive member a plurality of the solar cell units, the solar cell string is configured such that the first current collecting wiring portion of the solar cell unit between the solar cell unit on the most upstream side and the solar cell unit on the most downstream side in the direction of electric current flow is connected to the first current collecting wiring portion of the adjacent solar cell unit, and the second current collecting wiring is connected to the second current collecting wiring portion of the adjacent solar cell unit.

5. A solar cell module, wherein, the solar cell module has a plurality of the solar cell units according to claim 1 or 2, and the solar cell units are directly or connected via a conductive member, in the solar cell units, there are a first solar cell unit and a second solar cell unit, the first solar cell unit has a first side, the first current collecting wiring portion extends along the first side, and the second current collecting wiring portion is arranged at an interval from the first current collecting wiring portion and extends along the extending direction of the first current collecting wiring portion, the first solar cell unit is configured such that the through portion is located between the first current collecting wiring portion and the second current collecting wiring portion and extends along the extending direction of the first current collecting wiring portion, the second solar cell unit has: a second side extending substantially parallel to the first side of the first solar cell unit; and a third current collecting wiring portion extending along the second side, and the second solar cell unit is arranged at an interval from the first solar cell unit. The distance between the first current collecting wiring portion and the second current collecting wiring portion is 0.9 times or more and 1.1 times or less the distance between the first current collecting wiring portion and the third current collecting wiring portion. The distance between the first side of the first solar cell unit and the second side of the second solar cell unit is 0.9 times or more and 1.1 times or less the width of the through portion.

6. A solar cell module having a plurality of solar cell units directly or via conductive members connected to each other, wherein, each of the plurality of solar cell units includes: a first power generation region; a second power generation region; a first current collecting wiring portion capable of being electrically connected to the first power generation region; a second current collecting wiring portion capable of being electrically connected to the second power generation region; and a conduction restricting portion that divides the first power generation region and the second power generation region and restricts conduction between the first power generation region and the second power generation region. Among the plurality of solar cell units, there are a first solar cell unit and a second solar cell unit. The first solar cell unit is configured such that the first current collecting wiring portion is independent of the second current collecting wiring portion and is connected to the first current collecting wiring portion of the second solar cell unit, and the second current collecting wiring portion is connected to the second current collecting wiring portion of the second solar cell unit.

7. A solar cell module, wherein, the solar cell module has a first solar cell unit and a second solar cell unit. The first solar cell unit has a first side and includes: a first current collecting wiring portion extending along the first side; a second current collecting wiring portion spaced apart from the first current collecting wiring portion and extending in the extending direction of the first current collecting wiring portion; and a through portion located between the first current collecting wiring portion and the second current collecting wiring portion and formed by one or more through holes extending in the extending direction of the first current collecting wiring portion. The through portion is a conduction restricting portion that restricts conduction between the first current collecting wiring portion side and the second current collecting wiring portion side in the first solar cell unit. The second solar cell unit is disposed at a distance from the first solar cell unit. The second solar cell unit has: a second side extending substantially parallel to the first side of the first solar cell unit; and a third current collecting wiring portion extending along the second side. The distance between the first current collecting wiring portion and the second current collecting wiring portion is 0.9 times or more and 1.1 times or less the distance between the first current collecting wiring portion and the third current collecting wiring portion. The distance between the first side of the first solar cell unit and the second side of the second solar cell unit is 0.9 times or more and 1.1 times or less the width of the through portion.

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