TWI536594B - Solar cell and module comprising the same - Google Patents

Description

太陽能電池及其模組 Solar cell and its module

本發明是有關於一種太陽能電池及其模組，特別是指一種晶體矽太陽能電池及其模組。 The invention relates to a solar cell and a module thereof, in particular to a crystal germanium solar cell and a module thereof.

參閱圖1、2，一般太陽能電池包含一光電轉換基板91、配置於該光電轉換基板91之一受光面911上的一正面電極92，以及配置於該光電轉換基板91之一背面912上的一背電極93。該背電極93包括彼此間隔排列於該背面912上且沿一第一方向901長向延伸的數個匯流電極段931，以及覆蓋於該背面912與該數個匯流電極段931上之一集電極層932。該集電極層932具有分別對應該數個匯流電極段931而使該數個匯流電極段931外露的數個開口933。 Referring to FIGS. 1 and 2, a general solar cell includes a photoelectric conversion substrate 91, a front electrode 92 disposed on a light receiving surface 911 of the photoelectric conversion substrate 91, and a surface disposed on a back surface 912 of the photoelectric conversion substrate 91. Back electrode 93. The back electrode 93 includes a plurality of bus electrode segments 931 spaced apart from each other and extending along a first direction 901, and a collector electrode covering the back surface 912 and the plurality of bus electrode segments 931. Layer 932. The collector layer 932 has a plurality of openings 933 that respectively correspond to the plurality of bus electrode segments 931 and expose the plurality of bus electrode segments 931.

在製造上，通常會將數個太陽能電池與其它構件封裝成為太陽能電池模組，並且必須藉由焊帶導線(Ribbon)99焊接在其中一個太陽能電池的正面電極92與另一個太陽能電池的背電極93，藉此使相鄰的太陽能電池之間形成電連接。其中，所述焊帶導線99通常包括一銅基材991，以及包覆在該銅基材991之周圍的一焊錫層992。 In manufacturing, several solar cells and other components are usually packaged into a solar cell module, and must be soldered to the front electrode 92 of one of the solar cells and the back electrode of the other solar cell by a ribbon wire 99. 93, thereby making an electrical connection between adjacent solar cells. The strip conductor 99 generally includes a copper substrate 991 and a solder layer 992 surrounding the copper substrate 991.

以所述焊帶導線99焊接在該背電極93的狀況來說，先將焊帶導線99對應該數個匯流電極段931之位置及方向(即沿該第一方向901)擺置，並以一加熱製程使焊帶導線99的焊錫層992熔化而通過該數個開口933並接觸該數個匯流電極段931。當焊錫層992冷卻固化後，即會使焊帶導線99連接於該數個匯流電極段931。 In the case where the strip conductor 99 is soldered to the back electrode 93, the strip conductor 99 is first placed corresponding to the position and direction of the plurality of bus electrode segments 931 (ie, along the first direction 901), and A heating process melts the solder layer 992 of the ribbon conductor 99 through the plurality of openings 933 and contacts the plurality of bus electrode segments 931. When the solder layer 992 is cooled and solidified, the strip conductor 99 is connected to the plurality of bus electrode segments 931.

該數個開口933的尺寸小於該數個匯流電極段931的尺寸，因此該集電極層932具有數個分別重疊於該數個匯流電極段931上的重疊區934，而重疊區934和匯流電極段931之間有一表面高度落差，使該集電極層932整體的厚度並不平均。於是，在將所述焊帶導線99焊接於該背電極93上時，該數個匯流電極段931外露的表面無法完全與所述焊帶導線99的焊錫層992接觸，並形成兩個間隙98，進而導致所述焊帶導線99與匯流電極段931之間的有效結合面積及焊接結合力下降。此外，前述重疊區934也會產生應力集中而造成太陽能電池破片的問題。 The size of the plurality of openings 933 is smaller than the size of the plurality of bus electrode segments 931, so the collector layer 932 has a plurality of overlapping regions 934 respectively overlapping the plurality of bus electrode segments 931, and the overlapping regions 934 and the bus electrodes There is a surface height drop between the segments 931 such that the thickness of the collector layer 932 as a whole is not uniform. Therefore, when the solder ribbon wire 99 is soldered to the back electrode 93, the exposed surface of the plurality of bus electrode segments 931 cannot completely contact the solder layer 992 of the ribbon conductor 99, and two gaps 98 are formed. Further, the effective bonding area and the solder bonding force between the ribbon wire 99 and the bus electrode segment 931 are lowered. In addition, the aforementioned overlap region 934 also causes stress concentration to cause a problem of solar cell fragmentation.

參閱圖3、4，為了克服以上的問題，有業者調整所述開口933及所述匯流電極段931在該第一方向901上的相對長度，使每一個匯流電極段931在該第一方向901上的兩端不會受到該集電極層932的覆蓋。於是，每一開口933除了具有一個對應地位於該匯流電極段931上方的焊接口部935之外，還具有位於該焊接口部935之相反端且露出該光電轉換基板91的兩個露出口部936。 Referring to FIGS. 3 and 4, in order to overcome the above problems, the operator adjusts the relative length of the opening 933 and the bus electrode segment 931 in the first direction 901 such that each of the bus electrode segments 931 is in the first direction 901. The upper ends are not covered by the collector layer 932. Thus, each opening 933 has, in addition to the soldering port portion 935 correspondingly located above the bus bar electrode segment 931, a second exposed end portion at the opposite end of the soldering port portion 935 and exposing the photoelectric conversion substrate 91. 936.

藉由前述設計，使該集電極層932整體的厚度 變得較為平均，可增加所述匯流電極段931和所述導電焊帶99之間有效的焊接面積及焊接結合力，同時又能改善累積應力的問題，降低太陽能電池封裝為模組時的模組破片率。不過，因為該光電轉換基板91的背面912對應該兩個露出口部936的露出表面913並未設置任何的電極，因此，該光電轉換基板91位於前述露出表面913附近的區域所產生的載子，則需要傳輸較長的路徑才能傳送到該數個匯流電極段931。換句話說，前述結構雖能降低太陽能電池封裝為模組時的模組破片率，卻衍生載子移動路徑較長、載子復合機率較高等問題，致使電流收集效果較差，從而降低模組封裝輸出功率。 The thickness of the collector layer 932 as a whole by the foregoing design It becomes more average, and the effective welding area and the welding bonding force between the bus electrode segment 931 and the conductive ribbon 99 can be increased, and at the same time, the problem of cumulative stress can be improved, and the mode when the solar cell package is a module can be reduced. Group fragmentation rate. However, since the back surface 912 of the photoelectric conversion substrate 91 does not have any electrodes corresponding to the exposed surfaces 913 of the two exposed opening portions 936, the carriers generated by the photoelectric conversion substrate 91 located in the vicinity of the exposed surface 913 are provided. , a longer path needs to be transmitted to be transmitted to the plurality of bus electrode segments 931. In other words, although the foregoing structure can reduce the module fragmentation rate when the solar cell package is a module, but the problem that the carrier has a long moving path and a high carrier composite probability, the current collection effect is poor, thereby reducing the module package. Output Power.

因此，本發明之目的，即在提供一種太陽能電池及其模組，其在兼顧低破片率的同時還能提高電流收集效果以增進模組封裝輸出功率。 Therefore, the object of the present invention is to provide a solar cell and a module thereof which can improve the current collecting effect while improving the module package output power while taking into consideration the low fragmentation rate.

於是，本發明太陽能電池，包含：一光電轉換基板、一正面電極、一背面匯流電極段，以及一集電極層。 Thus, the solar cell of the present invention comprises: a photoelectric conversion substrate, a front electrode, a back side bus electrode segment, and a collector layer.

該光電轉換基板包括彼此相反的一受光面與一背面。該正面電極位於該受光面上。該背面匯流電極段位於該背面上且沿一第一方向延伸，該背面匯流電極段包括一主體部及由該主體部延伸出的一第一延伸部。該第一延伸部之寬度小於該主體部之寬度，且該第一延伸部具有遠離該主體部之一遠端。該集電極層位於該背面，並包括與 該背面匯流電極段重疊且沿該第一方向延伸的一開口。該開口可區分為與該主體部重疊之一接合區，以及與該主體部不重疊之一第一露出區。該第一露出區位於該開口在沿該第一方向上之一端。該第一延伸部的遠端與該主體部在沿該第一方向上分別位於該第一露出區之兩側。 The photoelectric conversion substrate includes a light receiving surface and a back surface opposite to each other. The front electrode is located on the light receiving surface. The back side bus electrode segment is located on the back surface and extends along a first direction. The back side bus electrode segment includes a body portion and a first extension portion extending from the body portion. The width of the first extension is smaller than the width of the body portion, and the first extension has a distal end away from the body portion. The collector layer is located on the back side and includes The back side bus electrode segments overlap and an opening extending in the first direction. The opening may be divided into one of the joint regions overlapping the body portion and a first exposed region that does not overlap the body portion. The first exposed area is located at one end of the opening along the first direction. The distal end of the first extension portion and the main body portion are respectively located on opposite sides of the first exposed area in the first direction.

本發明太陽能電池模組，包含：相對設置的一第一板材與一第二板材、一第一太陽能電池與一第二太陽能電池、一焊帶導線，以及一封裝材。 The solar cell module of the present invention comprises: a first plate and a second plate disposed oppositely, a first solar cell and a second solar cell, a ribbon wire, and a package.

該第一太陽能電池與該第二太陽能電池排列於該第一板材與該第二板材之間，該第二太陽能電池為如前所述的太陽能電池。該焊帶導線連接該第一太陽能電池與該第二太陽能電池，該焊帶導線包括連接該第一太陽能電池的一第一導線段，以及電性連接於該第二太陽能電池的背面匯流電極段的一第二導線段。該封裝材位於該第一板材與該第二板材之間，並包覆在該第一太陽能電池、該第二太陽能電池及該焊帶導線的周圍。 The first solar cell and the second solar cell are arranged between the first plate and the second plate, and the second solar cell is a solar cell as described above. The ribbon wire is connected to the first solar cell and the second solar cell, the ribbon wire includes a first wire segment connecting the first solar cell, and a back side bus electrode segment electrically connected to the second solar cell a second wire segment. The encapsulant is located between the first plate and the second plate and is wrapped around the first solar cell, the second solar cell, and the tape lead.

本發明之功效在於：透過前述創新的結構設計，可藉由該第一延伸部協助收集該光電轉換基板內對應該第一露出區的部位所生成的載子，縮短前述部位所生成的載子的移動路徑，因而可降低載子復合機率，提升電流收集效果及模組封裝輸出功率。 The effect of the present invention is that, through the above-mentioned innovative structural design, the carrier generated by the portion corresponding to the first exposed region in the photoelectric conversion substrate can be assisted by the first extending portion, and the carrier generated by the portion can be shortened. The moving path can reduce the carrier composite probability, improve the current collecting effect and the module package output power.

11‧‧‧第一板材 11‧‧‧ first plate

12‧‧‧第二板材 12‧‧‧Second plate

13‧‧‧太陽能電池 13‧‧‧Solar battery

131‧‧‧第一太陽能電池 131‧‧‧First solar cell

132‧‧‧第二太陽能電池 132‧‧‧Second solar cell

14‧‧‧焊帶導線 14‧‧‧welding wire

141‧‧‧第一導線段 141‧‧‧First wire segment

142‧‧‧第二導線段 142‧‧‧Second wire segment

15‧‧‧封裝材 15‧‧‧Package

2‧‧‧光電轉換基板 2‧‧‧Photoelectric conversion substrate

21‧‧‧受光面 21‧‧‧Stained surface

22‧‧‧背面 22‧‧‧ Back

221‧‧‧露出表面 221‧‧‧ exposed surface

23‧‧‧射極層 23‧‧ ‧ emitter layer

3‧‧‧抗反射層 3‧‧‧Anti-reflective layer

4‧‧‧正面電極 4‧‧‧Front electrode

41‧‧‧正面匯流電極 41‧‧‧ Positive Convergence Electrode

42‧‧‧正面指狀電極 42‧‧‧Front finger electrodes

5‧‧‧背表面電場 5‧‧‧Back surface electric field

6‧‧‧背面匯流電極段 6‧‧‧Backside bus electrode segment

600‧‧‧背面匯流電極 600‧‧‧Backside bus electrode

61‧‧‧第一延伸部 61‧‧‧First Extension

610‧‧‧遠端 610‧‧‧Remote

611‧‧‧延伸子部 611‧‧‧Extensions

612‧‧‧連接子部 612‧‧‧Connected subsection

613‧‧‧外邊 613‧‧‧ outside

614‧‧‧延伸子部外邊 614‧‧‧External extensions

615‧‧‧連接子部外邊 615‧‧‧Connected outside the subsection

62‧‧‧第二延伸部 62‧‧‧Second extension

620‧‧‧遠端 620‧‧‧Remote

621‧‧‧延伸子部 621‧‧‧Extensions

622‧‧‧連接子部 622‧‧‧Connected subsection

623‧‧‧外邊 623‧‧‧ outside

624‧‧‧延伸子部外邊 624‧‧‧External extensions

625‧‧‧連接子部外邊 625‧‧‧Connected outside the subsection

63‧‧‧主體部 63‧‧‧ Main body

630‧‧‧端緣 630‧‧‧ edge

630’‧‧‧端緣 630’‧‧‧ edge

631‧‧‧第一連接處 631‧‧‧First connection

632‧‧‧第二連接處 632‧‧‧Second junction

633‧‧‧側邊 633‧‧‧ side

7‧‧‧集電極層 7‧‧‧ Collector layer

70‧‧‧開口 70‧‧‧ openings

71‧‧‧接合區 71‧‧‧ junction area

72‧‧‧第一露出區 72‧‧‧First exposed area

721‧‧‧外邊 721‧‧‧ outside

73‧‧‧第二露出區 73‧‧‧Second exposed area

731‧‧‧外邊 731‧‧‧ outside

74‧‧‧基部 74‧‧‧ base

75‧‧‧第一擴張部 75‧‧‧First Expansion Department

76‧‧‧第二擴張部 76‧‧‧Second Expansion Department

77‧‧‧第一收縮部 77‧‧‧First constriction

78‧‧‧第二收縮部 78‧‧‧Second constriction

81‧‧‧第一連接電極 81‧‧‧First connecting electrode

82‧‧‧第二連接電極 82‧‧‧Second connection electrode

91‧‧‧光電轉換基板 91‧‧‧Photoelectric conversion substrate

901‧‧‧第一方向 901‧‧‧First direction

911‧‧‧受光面 911‧‧‧Glossy

912‧‧‧背面 912‧‧‧ back

913‧‧‧露出表面 913‧‧‧ exposed surface

92‧‧‧正面電極 92‧‧‧Front electrode

93‧‧‧背電極 93‧‧‧Back electrode

931‧‧‧匯流電極段 931‧‧‧Concurrent electrode segment

932‧‧‧集電極層 932‧‧‧ collector layer

933‧‧‧開口 933‧‧‧ openings

934‧‧‧重疊區 934‧‧‧Overlapping area

935‧‧‧焊接口部 935‧‧‧welding mouth

936‧‧‧露出口部 936‧‧‧Exports Department

98‧‧‧間隙 98‧‧‧ gap

99‧‧‧焊帶導線 99‧‧‧welding wire

991‧‧‧銅基材 991‧‧‧Copper substrate

992‧‧‧焊錫層 992‧‧‧ Solder layer

Y‧‧‧第一方向 Y‧‧‧First direction

X‧‧‧第二方向 X‧‧‧second direction

W1~W11‧‧‧寬度 W1~W11‧‧‧Width

D1~D11‧‧‧距離 D1~D11‧‧‧Distance

L1~L7‧‧‧長度 L1~L7‧‧‧ length

本發明之其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中： 圖1是一般太陽能電池之一背面示意圖，圖中以假想線額外畫出數個焊帶導線；圖2是圖1的太陽能電池之一局部剖面示意圖，圖中的剖面位置如圖1之A-A線所示，並且該太陽能電池之背面朝上繪製，主要顯示該太陽能電池的背面與該數個焊帶導線的關係；圖3是另一種太陽能電池之一局部背面示意圖，圖中同樣以假想線額外畫出數個焊帶導線；圖4是圖3的太陽能電池之一局部背面示意圖，圖中的剖面位置如圖3之B-B線所示，並且該太陽能電池之背面朝上繪製，主要顯示該太陽能電池的背面與該數個焊帶導線的關係；圖5是本發明太陽能電池模組之一第一實施例之一局部剖視示意圖；圖6是該第一實施例之一太陽能電池之一正面示意圖；圖7是該第一實施例之太陽能電池之一背面示意圖，圖中以假想線額外畫出數個焊帶導線；圖8是沿圖7之C-C線所取之一局部剖面示意圖，圖中為了方便示意而將該太陽能電池之一背面朝上繪製，但圖中並未如圖7般以假想線額外畫出焊帶導線；圖9是圖7的局部背面放大圖，主要顯示該太陽能電池之一集電極層的一開口與一背面匯流電極段的關係，但圖中並未如圖7般以假想線額外畫出焊帶導線；圖10是類似圖7之一局部背面放大圖，圖中省略該太 陽能電池之集電極層，並且主要顯示該太陽能電池之背面匯流電極段的結構；圖11是類似圖7之一局部背面放大圖，圖中單獨顯示該太陽能電池之集電極層，並且主要顯示該集電極層之開口的結構；圖12是類似圖7之一局部背面放大圖，主要說明以形狀界定區分該開口的結構；圖13是本發明太陽能電池模組之一太陽能電池之一第二實施例之一局部背面放大圖；圖14是本發明太陽能電池模組之一太陽能電池之一第三實施例之一局部背面放大圖，圖中以假想線額外畫出焊帶導線；圖15是本發明太陽能電池模組之一太陽能電池之一第四實施例之一局部背面放大圖；圖16是本發明太陽能電池模組之一太陽能電池之一第五實施例之一局部背面放大圖；圖17是本發明太陽能電池模組之一太陽能電池之一第六實施例之一局部背面放大圖，圖中以假想線額外畫出焊帶導線；圖18是本發明太陽能電池模組之一太陽能電池之一第七實施例之一局部背面放大圖；圖19是本發明太陽能電池模組之一太陽能電池之一第八實施例之一局部背面放大圖，圖中以假想線額外畫出焊帶導線； 圖20是本發明太陽能電池模組之一太陽能電池之一第九實施例之一局部背面放大圖，圖中以假想線額外畫出焊帶導線；圖21是本發明太陽能電池模組之一太陽能電池之一第十實施例之一局部背面放大圖，圖中以假想線額外畫出焊帶導線；圖22是本發明太陽能電池模組之一太陽能電池之一第十一實施例之一背面放大圖；圖23是本發明太陽能電池模組之一太陽能電池之一第十二實施例之一背面放大圖；及圖24是本發明太陽能電池模組之一太陽能電池之一第十三實施例之一背面放大圖。 Other features and effects of the present invention will be apparent from the embodiments of the drawings, in which: 1 is a schematic view of a back side of a general solar cell. In the figure, a plurality of solder ribbon wires are additionally drawn by an imaginary line; FIG. 2 is a partial cross-sectional view of the solar cell of FIG. 1, and the cross-sectional position in the figure is shown in FIG. As shown, and the back side of the solar cell is drawn upwards, mainly showing the relationship between the back side of the solar cell and the plurality of solder ribbon wires; FIG. 3 is a partial rear view of another solar cell, which is also additionally provided by an imaginary line. Figure 5 is a partial rear view of the solar cell of Figure 3, the cross-sectional position in the figure is shown as BB line in Figure 3, and the back side of the solar cell is drawn upwards, mainly showing the solar energy FIG. 5 is a partial cross-sectional view showing a first embodiment of a solar cell module of the present invention; FIG. 6 is a front view of one of the solar cells of the first embodiment; FIG. 7 is a schematic rear view of one of the solar cells of the first embodiment, in which a plurality of ribbon conductors are additionally drawn by imaginary lines; FIG. 8 is a partial section taken along line CC of FIG. In the figure, in the figure, one of the solar cells is drawn upwards for convenience of illustration, but in the figure, the ribbon is not additionally drawn as an imaginary line as shown in FIG. 7; FIG. 9 is a partial enlarged view of FIG. A relationship between an opening of one of the collector layers of the solar cell and a backside bus electrode segment is shown, but the strip conductor is not additionally drawn as an imaginary line as shown in FIG. 7; FIG. 10 is a partial back surface similar to FIG. Enlarged view, the figure is omitted The collector layer of the solar cell, and mainly shows the structure of the back side bus electrode segment of the solar cell; FIG. 11 is a partial back enlarged view similar to FIG. 7, the collector layer of the solar cell is separately shown, and the main display is The structure of the opening of the collector layer; FIG. 12 is a partial back enlarged view similar to FIG. 7, mainly illustrating the structure defining the opening by shape; FIG. 13 is a second solar cell of the solar cell module of the present invention. FIG. 14 is a partially enlarged side elevational view of a third embodiment of a solar cell of one of the solar cell modules of the present invention, in which a ribbon is additionally drawn with an imaginary line; FIG. 15 is A partial rear enlarged view of a fourth embodiment of a solar cell of a solar cell module of the present invention; FIG. 16 is a partial rear enlarged view of a fifth embodiment of a solar cell of one of the solar cell modules of the present invention; 17 is a partial back enlarged view of a sixth embodiment of a solar cell of one of the solar cell modules of the present invention, in which an additional strip conductor is drawn with an imaginary line; 18 is a partial rear enlarged view of a seventh embodiment of a solar cell of one of the solar cell modules of the present invention; FIG. 19 is a partial back enlarged view of an eighth embodiment of a solar cell of one of the solar cell modules of the present invention; In the figure, the ribbon wire is additionally drawn with an imaginary line; 20 is a partial rear enlarged view of a ninth embodiment of a solar cell of a solar cell module of the present invention, in which an additional fused wire is drawn; FIG. 21 is a solar cell module of the present invention. One of the tenth embodiments of the battery is a partial rear enlarged view, in which the ribbon is additionally drawn with an imaginary line; and FIG. 22 is an enlarged view of one of the eleventh embodiments of the solar cell of the solar cell module of the present invention. 23 is a rear enlarged view of a twelfth embodiment of a solar cell of one of the solar cell modules of the present invention; and FIG. 24 is a thirteenth embodiment of a solar cell of one of the solar cell modules of the present invention; An enlarged view of the back.

在本發明被詳細描述之前，應當注意在以下的說明內容中，類似的元件是以相同的編號來表示。 Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

參閱圖5，本發明太陽能電池模組之一第一實施例包含：相對設置的一第一板材11與一第二板材12、陣列式地排列於該第一板材11與該第二板材12之間的數個太陽能電池13、數個焊帶導線14，以及一封裝材15。 Referring to FIG. 5, a first embodiment of a solar cell module of the present invention comprises: a first plate 11 and a second plate 12 disposed opposite to each other, and arranged in an array on the first plate 11 and the second plate 12 A plurality of solar cells 13, a plurality of ribbon conductors 14, and a package material 15 are interposed.

該第一板材11與該第二板材12的材料沒有特殊限制，可使用玻璃或塑膠板材，而且位於該數個太陽能電池13之受光側的板材必須可透光。每一焊帶導線14連接兩相鄰的太陽能電池13之間，並包括連接該兩相鄰的其中之一太陽能電池13的正面側的一第一導線段141，以及 連接該兩相鄰的其中另一太陽能電池13的背面側的一第二導線段142。 The material of the first plate 11 and the second plate 12 is not particularly limited, and a glass or plastic plate may be used, and the plate on the light receiving side of the plurality of solar cells 13 must be permeable to light. Each of the strip conductors 14 is connected between two adjacent solar cells 13 and includes a first wire segment 141 connecting the front side of one of the two adjacent solar cells 13 and A second wire segment 142 on the back side of the two adjacent solar cells 13 is connected.

在本實施例中，該數個太陽能電池13進一步區分成數個第一太陽能電池131與一第二太陽能電池132。在實施上，所述第一太陽能電池131的數量也可為一個，此時，焊帶導線14的數量也可為一個，並連接於該第一太陽能電池131與該第二太陽能電池132之間。因此，第一太陽能電池131的數量及焊帶導線14的數量不以本實施例圖式所揭露的態樣為限。 In this embodiment, the plurality of solar cells 13 are further divided into a plurality of first solar cells 131 and a second solar cell 132. In practice, the number of the first solar cells 131 may also be one. In this case, the number of the ribbon wires 14 may also be one, and is connected between the first solar cell 131 and the second solar cell 132. . Therefore, the number of the first solar cells 131 and the number of the ribbon wires 14 are not limited to the aspects disclosed in the drawings of the embodiment.

該封裝材15位於該第一板材11與該第二板材12之間，並包覆在該數個太陽能電池13及該焊帶導線14的周圍。該封裝材15的材質例如可透光的乙烯醋酸乙烯共聚物(EVA)，或其他可用於太陽能電池模組封裝的相關材料，並不限於本實施例的舉例。 The encapsulant 15 is located between the first plate 11 and the second plate 12 and is wrapped around the plurality of solar cells 13 and the tape leads 14 . The material of the encapsulant 15 is, for example, a light transmissive ethylene vinyl acetate copolymer (EVA), or other related materials usable for the solar cell module package, and is not limited to the examples of the embodiment.

在本實施例中，該數個太陽能電池13的結構皆相同，當然，該數個太陽能電池13的結構也可不相同，以下僅以其中一個太陽能電池13為例說明其結構。 In the present embodiment, the structures of the plurality of solar cells 13 are the same. Of course, the structures of the plurality of solar cells 13 may be different. Hereinafter, only one of the solar cells 13 will be described as an example.

參閱圖6、7、8，該太陽能電池13包含：一光電轉換基板2、一抗反射層3、一正面電極4、數個背面匯流電極段6，以及一集電極層7。圖7中以假想線額外畫出該數個焊帶導線14的第二導線段142，藉此顯示該數個第二導線段142配置於應該太陽能電池13上的位置，以說明兩者之間對應關係。 Referring to FIGS. 6, 7, and 8, the solar cell 13 includes a photoelectric conversion substrate 2, an anti-reflection layer 3, a front electrode 4, a plurality of back surface bus electrode segments 6, and a collector layer 7. The second wire segment 142 of the plurality of ribbon conductors 14 is additionally drawn in an imaginary line in FIG. 7, thereby showing that the plurality of second wire segments 142 are disposed on the solar cell 13 to indicate the relationship therebetween. Correspondence relationship.

該光電轉換基板2可為p型或n型的基板，並 可為單晶或多晶矽基板。該光電轉換基板2包括彼此相反的一受光面21與一背面22，以及位於該受光面21處之內的一射極層23。該射極層23與其所鄰接的該光電轉換基板2之其他部分形成p-n接面，並可將特定波段之入射光轉換成光電流。 The photoelectric conversion substrate 2 may be a p-type or n-type substrate, and It can be a single crystal or polycrystalline substrate. The photoelectric conversion substrate 2 includes a light receiving surface 21 and a back surface 22 opposite to each other, and an emitter layer 23 located inside the light receiving surface 21. The emitter layer 23 forms a p-n junction with other portions of the photoelectric conversion substrate 2 adjacent thereto, and converts incident light of a specific wavelength band into a photocurrent.

該抗反射層3位於該受光面21上且接觸該射極層，該抗反射層3的材料例如氮化矽(SiN_x)等，用於提升光線入射量以及降低載子表面複合速率(Surface Recombination Velocity，簡稱SRV)。 The anti-reflection layer 3 is located on the light-receiving surface 21 and contacts the emitter layer. The material of the anti-reflection layer 3 is, for example, tantalum nitride (SiN _x ) or the like, for increasing the incident amount of light and reducing the surface recombination rate of the carrier (Surface) Recombination Velocity, referred to as SRV).

該正面電極4配置於該受光面21上，並可利用網版印刷導電漿料並經燒結之方式而製成。實際上該正面電極4可以包括至少一正面匯流電極41，以及連接該正面匯流電極41的數個正面指狀電極42。 The front electrode 4 is disposed on the light receiving surface 21, and can be formed by screen printing a conductive paste and sintering it. In fact, the front electrode 4 may include at least one front bus electrode 41 and a plurality of front finger electrodes 42 connected to the front bus electrode 41.

每一正面匯流電極41沿一第一方向Y延伸，該數個正面匯流電極41分別沿一第二方向X間隔排列。每一正面指狀電極42沿該第二方向X延伸，該數個指狀匯流電極分別沿該第一方向Y間隔排列。在本實施例中，該第一方向Y垂直該第二方向X。而所述正面匯流電極41的數量也可僅為一個，而不限於本實施例所揭露的形式。 Each of the front surface bus electrodes 41 extends in a first direction Y, and the plurality of front side bus electrodes 41 are respectively arranged in a second direction X. Each of the front finger electrodes 42 extends along the second direction X, and the plurality of finger bus electrodes are respectively arranged along the first direction Y. In this embodiment, the first direction Y is perpendicular to the second direction X. The number of the front bus electrodes 41 may also be only one, and is not limited to the form disclosed in the embodiment.

參閱圖7、8、9，該數個背面匯流電極段6位於該背面22上，而電性連接地接觸該背面22。該數個背面匯流電極段6分別皆沿該第一方向Y延伸，並且是數個沿該第一方向Y間隔排列以構成一組背面匯流電極600。在本實施例中，該光電轉換基板2為多晶矽基板，而該數 個背面匯流電極段6構成沿該第二方向X間隔排列的三組背面匯流電極600。至於每一組背面匯流電極600中的背面匯流電極段6的數量，則不以本實施例所揭露的形式為限。 Referring to Figures 7, 8, and 9, the plurality of back side bus electrode segments 6 are located on the back side 22 and are electrically connected to the back side 22. The plurality of back side bus electrode segments 6 respectively extend along the first direction Y, and are arranged at intervals along the first direction Y to form a set of back side bus electrodes 600. In this embodiment, the photoelectric conversion substrate 2 is a polycrystalline germanium substrate, and the number The back side bus electrode segments 6 constitute three sets of back side bus electrodes 600 arranged in the second direction X. As for the number of the back side bus electrode segments 6 in each of the back side bus electrodes 600, it is not limited to the form disclosed in the embodiment.

該集電極層7整層地配置在該背面22上而電性連接地接觸該背面22，所謂整層地配置係指外觀上大致呈片狀並覆蓋該光電轉換基板2的背面22側大部分區域。在本實施例中，該集電極層7接觸該背面22的部位，部分的金屬元素會擴散至該背面22內側，進而使該光電轉換基板2位於該背面22內側處局部區域之摻雜濃度大於該光電轉換基板2內部，藉此形成一背表面電場(Back-Surface Field，簡稱BSF)5，能降低少數載子的表面複合速率及增加多數載子的橫向傳輸能力以提升載子收集效率，進而提升電池的光電轉換效率。 The collector layer 7 is disposed on the back surface 22 in an entire layer and electrically connected to the back surface 22, and the entire layer is disposed in a substantially sheet shape and covers most of the back surface 22 side of the photoelectric conversion substrate 2. region. In this embodiment, the collector layer 7 contacts the portion of the back surface 22, and a portion of the metal element diffuses to the inner side of the back surface 22, so that the doping concentration of the photoelectric conversion substrate 2 at a portion of the inner side of the back surface 22 is greater than The inside of the photoelectric conversion substrate 2, thereby forming a Back-Surface Field (BSF) 5, can reduce the surface recombination rate of a minority carrier and increase the lateral transmission capability of most carriers to improve the carrier collection efficiency. In turn, the photoelectric conversion efficiency of the battery is improved.

該集電極層7包括分別與該數個背面匯流電極段6重疊且沿該第一方向Y延伸的數個開口70。在本實施例中，該數個開口70是對應該數個背面匯流電極段6而分成三組，並且分別沿該第二方向X間隔排列。該數個開口70分別與該數個背面匯流電極段6重疊且位置相互對應，藉此使該數個背面匯流電極段6可外露以供所述焊帶導線14的第二導線段142焊接結合，並透過所述焊帶導線14將電能向外導出。在實施上，由於該數個背面匯流電極600也可構成兩組背面匯流電極600，此時，該數個開口70也會對應地分成二組而沿該第二方向X間隔排列。 The collector layer 7 includes a plurality of openings 70 respectively overlapping the plurality of back side bus electrode segments 6 and extending in the first direction Y. In the present embodiment, the plurality of openings 70 are divided into three groups corresponding to the plurality of back surface bus electrode segments 6, and are respectively arranged along the second direction X. The plurality of openings 70 overlap with the plurality of back surface bus electrode segments 6 and correspond to each other, thereby allowing the plurality of back surface bus electrode segments 6 to be exposed for soldering and bonding of the second wire segments 142 of the ribbon conductors 14. And discharging the electrical energy outward through the ribbon conductor 14. In practice, the plurality of back side bus electrodes 600 may also constitute two sets of back side bus electrodes 600. In this case, the plurality of openings 70 are also correspondingly divided into two groups and arranged in the second direction X.

在本實施例中，每一開口70的結構都相同，每一背面匯流電極段6的結構也都相同，故以下僅以其中一組相互位置對應且重疊的開口70與背面匯流電極段6為例進行說明。不過在實施上，在一太陽能電池13中，每一開口70只要能位置對應該數個背面匯流電極段6的其中之至少一背面匯流電極段6即可，該數個開口70的結構不以相同為絕對之必要，該數個背面匯流電極段6的結構也不以相同為絕對之必要。 In the present embodiment, the structure of each of the openings 70 is the same, and the structure of each of the back surface bus electrode segments 6 is also the same. Therefore, only the openings 70 and the back surface bus electrode segments 6 corresponding to each other and overlapping each other are The example is explained. However, in practice, in a solar cell 13, each opening 70 can be positioned corresponding to at least one of the back side bus electrode segments 6 of the plurality of back side bus electrode segments 6, and the structures of the plurality of openings 70 are not The same is absolutely necessary, and the structure of the plurality of back side bus electrode segments 6 is not absolutely necessary.

參閱圖8、9、10、11，該背面匯流電極段6包括一主體部63，及由該主體部63的相反兩側延伸出的一第一延伸部61與一第二延伸部62。 Referring to FIGS. 8, 9, 10, and 11, the back side bus electrode segment 6 includes a main body portion 63, and a first extending portion 61 and a second extending portion 62 extending from opposite sides of the main body portion 63.

該主體部63具有沿該第一方向Y排列且反向弧凸的兩個端緣630、630’，以及沿該第一方向Y延伸而連接於該兩個端緣630、630’之間的兩個側邊633。該集電極層7跨過而覆蓋於該兩個側邊633至少其中之一，藉以連接於該等匯流電極段6的部分區域，於是，該集電極層7所收集而來的電能會傳到至該背面匯流電極段6，再透過相連的所述焊帶導線14將電能向外導出。 The main body portion 63 has two end edges 630, 630' arranged along the first direction Y and oppositely curved, and extending along the first direction Y to be connected between the two end edges 630, 630' Two sides 633. The collector layer 7 is overlaid to cover at least one of the two side edges 633, thereby being connected to a partial region of the bus electrode segments 6, so that the collected electrical energy of the collector layer 7 is transmitted to To the back side bus electrode section 6, the electric energy is outwardly led out through the connected strip conductors 14.

每一端緣630、630’皆具有兩個沿該第二方向X排列的一第一連接處631與一第二連接處632。在圖中，則以假想線分別標示該第一連接處631與該第二連接處632。 Each of the end edges 630, 630' has two first joints 631 and a second joint 632 arranged along the second direction X. In the figure, the first joint 631 and the second joint 632 are respectively indicated by imaginary lines.

該第一延伸部61與該主體部63於該端緣630的第一連接處631及第二連接處632相接，該端緣630的 第一連接處631及第二連接處632的距離D1大於該主體部63的寬度W1。 The first extension portion 61 is in contact with the first connection portion 631 and the second connection portion 632 of the end portion 630 of the main body portion 63. The distance D1 between the first connection portion 631 and the second connection portion 632 is greater than the width W1 of the main body portion 63.

該第一延伸部61具有分別由該端緣630的第一連接處631與第二連接處632沿該第一方向Y延伸的兩個延伸子部611，以及與該端緣630間隔且沿該第二方向X延伸而連接於該等延伸子部611之間的一連接子部612。 The first extension portion 61 has two extension sub-sections 611 extending from the first connection portion 631 and the second connection portion 632 of the end edge 630 in the first direction Y, and is spaced apart from the end edge 630 and along the The second direction X extends to be connected to a connecting sub-portion 612 between the extended sub-portions 611.

由於該第一延伸部61為收集載子之用，而非用於和焊帶導線14接觸，因此，該第一延伸部61之寬度W2、W3小於該主體部63之寬度W1，以節省材料不必要的消耗。所述的寬度W1、W2係指垂直該第一延伸部61之延伸方向上的長度，在本實施例中，是指該兩個延伸子部611在該第二方向X上的寬度W2，以及該連接子部612在該第一方向Y上的寬度W3。在實施上，所述寬度W2具體可為100~500μm，而所述寬度W3具體可為100~500μm。 Since the first extension portion 61 is for collecting carriers, and is not for contacting the ribbon conductor 14, the width W2, W3 of the first extension portion 61 is smaller than the width W1 of the body portion 63 to save material. Unnecessary consumption. The widths W1 and W2 are the lengths in the extending direction of the first extending portion 61, and in the present embodiment, the width W2 of the two extending sub-sections 611 in the second direction X, and The width W3 of the connecting subsection 612 in the first direction Y. In practice, the width W2 may be specifically 100-500 μm, and the width W3 may specifically be 100-500 μm.

其中，為了顧及網印精度的容許範圍，所述寬度W2宜為100μm以上，並且所述寬度W3宜為100μm以上。另一方面，由於該第一延伸部61接觸該光電轉換基板2之背面21處的位置，受到該第一延伸部61的遮擋，該集電極層7覆蓋於該第一延伸部61之部位不接觸該背面21，從而使前述位置不會形成該背表面電場5，又因為背表面電場5能降低少數載子的表面複合速率及增加多數載子的橫向傳輸能力以提升載子收集效率，進而提升電池的光電轉換效率，因此，所述寬度W2宜為500μm以下，並且所述寬度W3宜為500μm以下，以避免過分縮小該背表面 電場5存在於該光電轉換基板2中的面積比例。 In order to take into consideration the allowable range of the screen printing accuracy, the width W2 is preferably 100 μm or more, and the width W3 is preferably 100 μm or more. On the other hand, the position of the first extension portion 61 contacting the back surface 21 of the photoelectric conversion substrate 2 is blocked by the first extension portion 61, and the collector layer 7 covers the portion of the first extension portion 61. Contacting the back surface 21 such that the aforementioned position does not form the back surface electric field 5, and because the back surface electric field 5 can reduce the surface recombination rate of the minority carriers and increase the lateral transmission capability of the majority carriers to improve the carrier collection efficiency, Increasing the photoelectric conversion efficiency of the battery, therefore, the width W2 is preferably 500 μm or less, and the width W3 is preferably 500 μm or less to avoid excessively reducing the back surface. The area ratio of the electric field 5 present in the photoelectric conversion substrate 2.

在本實施例中，該第一延伸部61的連接子部612具有遠離該主體部63之一遠端610。 In the present embodiment, the connecting sub-portion 612 of the first extension portion 61 has a distal end 610 away from the main body portion 63.

該第二延伸部62與該主體部63於該端緣630’的第一連接處631及第二連接處632相接，該端緣630’的第一連接處631及第二連接處632的距離D2大於該主體部63的寬度W1。 The second extension portion 62 is in contact with the first connection portion 631 and the second connection portion 632 of the end portion 630 ′. The first connection portion 631 and the second connection portion 632 of the end edge 630 ′ are The distance D2 is larger than the width W1 of the main body portion 63.

在本實施例中，該第二延伸部62與第一延伸部61的結構相同且鏡向對稱，因此，該第二延伸部62之寬度W4、W5同樣小於該主體部63之寬度W1，並且該第二延伸部62同樣具有分別由該端緣630’的第一連接處631及第二連接處632沿該第一方向Y延伸的兩個延伸子部621，以及與該端緣630’間隔且沿該第二方向X延伸而連接於該等延伸子部621之間的一連接子部622。該連接子部622具有遠離該主體部63之一遠端620。 In this embodiment, the second extension portion 62 has the same structure and mirror symmetry as the first extension portion 61. Therefore, the widths W4 and W5 of the second extension portion 62 are also smaller than the width W1 of the main body portion 63, and The second extension portion 62 also has two extension sub-sections 621 extending from the first connection portion 631 and the second connection portion 632 of the end edge 630' along the first direction Y, and is spaced apart from the end edge 630' And extending along the second direction X to be connected to a connecting sub-portion 622 between the extending sub-portions 621. The connector subsection 622 has a distal end 620 that is remote from the body portion 63.

如同對該第一延伸部61之相同設計概念，由於該第二延伸部62為收集載子之用，而非用於和焊帶導線14接觸，因此，該第一延伸部61之寬度W2、W3小於該主體部63之寬度W1，以節省材料不必要的消耗。所述的寬度W4、W5係指垂直該第二延伸部62之延伸方向上的長度，在本實施例中，是指該兩個延伸子部621在該第二方向X上的寬度W4，以及該連接子部622在該第一方向Y上的寬度W5。在實施上，所述寬度W4具體可為100~500μm，而所述寬度W5具體可為100~500μm。至於所述寬 度W4、W5之數值上下限的臨界意義分別相同於所述寬度W2、W3，故不再贅述。 As with the same design concept of the first extension portion 61, since the second extension portion 62 is for collecting carriers, and not for contacting the ribbon conductor 14, the width W2 of the first extension portion 61 is W3 is smaller than the width W1 of the main body portion 63 to save unnecessary consumption of materials. The widths W4 and W5 refer to the length in the extending direction of the second extending portion 62. In this embodiment, the width W4 of the two extending sub-sections 621 in the second direction X, and The width W5 of the connecting sub-portion 622 in the first direction Y. In practice, the width W4 may be specifically 100-500 μm, and the width W5 may specifically be 100-500 μm. As for the width The critical meanings of the upper and lower limits of the values of degrees W4 and W5 are the same as the widths W2 and W3, respectively, and therefore will not be described again.

以是否與該主體部63重疊的方式來看，該開口70可區分為與該主體部63重疊之一接合區71，以及與該主體部63不重疊之一第一露出區72與一第二露出區73。該第一露出區72與該第二露出區73分別位於該開口70在沿該第一方向Y上之相反兩端。 The opening 70 can be distinguished as one of the joint regions 71 overlapping the main body portion 63, and one of the first exposed regions 72 and a second portion that does not overlap the main body portion 63, as viewed in a manner overlapping with the main body portion 63. The exposed area 73. The first exposed area 72 and the second exposed area 73 are respectively located at opposite ends of the opening 70 in the first direction Y.

該第一露出區72的一外邊721呈弧狀，在該第一方向Y上，該第一露出區72只要確保足夠焊接面積即可，在本實施中，該第一露出區72的最大寬度W10具體可為300~400μm。 An outer edge 721 of the first exposed region 72 has an arc shape. In the first direction Y, the first exposed region 72 only needs to ensure a sufficient soldering area. In the present embodiment, the maximum width of the first exposed region 72 is W10 can be specifically 300~400μm.

該第二露出區73的一外邊731亦呈弧狀，在該第一方向Y上，該第二露出區73只要確保足夠焊接面積即可，在本實施中，該第二露出區73的最大寬度W11具體可為300~400μm。 An outer edge 731 of the second exposed area 73 is also arcuate. In the first direction Y, the second exposed area 73 is only required to ensure a sufficient soldering area. In the present embodiment, the second exposed area 73 is the largest. The width W11 may specifically be 300 to 400 μm.

該光電轉換基板2之背面22具有分別位置對應於該第一露出區72與該第二露出區73的數個露出表面221。該數個露出表面221不被該背面匯流電極段6所覆蓋，亦不被該集電極層7所覆蓋。 The back surface 22 of the photoelectric conversion substrate 2 has a plurality of exposed surfaces 221 respectively corresponding to the first exposed area 72 and the second exposed area 73. The plurality of exposed surfaces 221 are not covered by the back side bus electrode segments 6 and are not covered by the collector layer 7.

在實施上，該數個露出表面221可能被該太陽能電池13的其他層體所覆蓋，例如在一PERC CELL結構中，在該背面22與該背面匯流電極段6、該集電極層7之間可設置有一該鈍化層，在此情形下該數個露出表面221受到該鈍化層所覆蓋。 In practice, the plurality of exposed surfaces 221 may be covered by other layers of the solar cell 13, such as in a PERC CELL structure, between the back surface 22 and the back side bus electrode segment 6, the collector layer 7. A passivation layer may be provided, in which case the plurality of exposed surfaces 221 are covered by the passivation layer.

在本實施例中，該第一延伸部61與該主體部63共同圈圍該第一露出區72，該第一延伸部61與該第一露出區72不重疊，並且該第一延伸部61的遠端610與該主體部63在沿該第一方向Y上分別位於該第一露出區72之兩側。該主體部63的端緣630和該第一露出區72鄰接，而該第一延伸部61則不鄰接第一露出區72，也就是該第一延伸部61的延伸子部611、連接子部612分別皆與該第一露出區72相間隔。 In the embodiment, the first extending portion 61 and the main body portion 63 are enclosed around the first exposed portion 72. The first extending portion 61 does not overlap with the first exposed portion 72, and the first extending portion 61 The distal end 610 and the main body portion 63 are respectively located on both sides of the first exposed area 72 along the first direction Y. The end edge 630 of the main body portion 63 is adjacent to the first exposed portion 72, and the first extending portion 61 does not abut the first exposed portion 72, that is, the extended sub-portion 611 and the connecting sub-portion of the first extending portion 61. Each of the 612 is spaced apart from the first exposed area 72.

在該第一方向Y上，該第一露出區72的外邊721與該連接子部612的最小距離D8為300~400μm。在該第二方向X上，該端緣630的第一連接處631和第二連接處632的距離D1大於該第一露出區72的長度L1。 In the first direction Y, the minimum distance D8 of the outer edge 721 of the first exposed region 72 and the connecting sub-portion 612 is 300-400 μm. In the second direction X, the distance D1 of the first joint 631 and the second joint 632 of the end edge 630 is greater than the length L1 of the first exposed area 72.

需要注意的是，所述長度L1在設計上應考量，網印該背面匯流電極段6以及網印形成有該開口70之該集電極層7之間的對位誤差，故所述長度L1不宜過小。又，所述長度L1在設計上還需考量因該集電極層7之披覆而形成於該背面22之內的該背表面電場5的區域大小，因為該集電極層7覆蓋於該第一延伸部61之部位不接觸該背面21，從而使前述位置不會形成該背表面電場5，故所述長度L1也不宜過大。 It should be noted that the length L1 should be considered in design, and the alignment error between the back surface bus electrode segment 6 and the screen layer 7 of the opening 70 is formed, so the length L1 is not suitable. too small. Moreover, the length L1 is also designed to consider the size of the area of the back surface electric field 5 formed in the back surface 22 due to the coating of the collector layer 7, because the collector layer 7 covers the first The portion of the extending portion 61 does not contact the back surface 21, so that the back surface electric field 5 is not formed at the aforementioned position, so the length L1 should not be too large.

另一方面，所述距離D1在設計上應考量所述距離D1應大於所述焊帶導線14的寬度W6(見圖7)，使該第一延伸部61的延伸子部611與該第二延伸部62的延伸子部621不會位於所述焊帶導線14的投影範圍內，前述結構 可減少所述焊帶導線14和『該集電極層7因覆蓋於該等延伸子部611、621上所形成之高起區域』相重疊的機會以確保焊接強度，故所述距離D1也不宜過小。又，所述距離D1在設計上還需考量該背表面電場5的區域大小，故所述距離D1也不宜過大。 On the other hand, the distance D1 should be designed such that the distance D1 should be greater than the width W6 of the ribbon conductor 14 (see FIG. 7), such that the extended subsection 611 of the first extension 61 and the second The extension portion 621 of the extension portion 62 is not located within the projection range of the ribbon conductor 14, the foregoing structure The opportunity to overlap the strip conductor 14 and the raised region formed by the collector layer 7 over the extended sub-portions 611, 621 can be reduced to ensure the soldering strength, so the distance D1 is not suitable. too small. Moreover, the distance D1 is also designed to consider the size of the area of the back surface electric field 5, so the distance D1 should not be too large.

該第二延伸部62與該主體部63共同圈圍該第二露出區73，該第二延伸部62與該第二露出區73不重疊，並且該第二延伸部62的遠端620與該主體部63在沿該第一方向Y上分別位於該第二露出區73之兩側。該主體部63的端緣630’和該第二露出區73鄰接，而該第二延伸部62則不鄰接第二露出區73，也就是該第二延伸部62的延伸子部621、連接子部622分別皆與該第二露出區73相間隔。 The second extending portion 62 and the main body portion 63 together enclose the second exposed area 73. The second extending portion 62 does not overlap with the second exposed portion 73, and the distal end 620 of the second extending portion 62 is The main body portions 63 are respectively located on both sides of the second exposed area 73 along the first direction Y. The end edge 630' of the main body portion 63 is adjacent to the second exposed portion 73, and the second extending portion 62 is not adjacent to the second exposed portion 73, that is, the extended sub-portion 621 and the connector of the second extending portion 62. The portions 622 are each spaced apart from the second exposed region 73.

該第一露出區72只要確保足夠焊接面積即可，在本實施中，在該第一方向Y上，該第二露出區73的最大寬度W11具體為300~400μm，該第二露出區73的外邊731與該連接子部622的最小距離D9為300~400μm。在該第二方向X上，該端緣630’的第一連接處631和第二連接處632的距離D2大於該第二露出區73的長度L2。至於所述距離D2與所述寬度L2之數值上下限的臨界意義，分別相同於所述距離D1與所述寬度L1，故不再贅述。 The first exposed area 72 is only required to ensure a sufficient soldering area. In the first embodiment, the maximum width W11 of the second exposed area 73 is specifically 300-400 μm, and the second exposed area 73 is The minimum distance D9 between the outer edge 731 and the connecting sub-portion 622 is 300 to 400 μm. In the second direction X, the distance D2 between the first joint 631 and the second joint 632 of the end edge 630' is greater than the length L2 of the second exposed region 73. The critical meanings of the upper and lower limits of the distance D2 and the width L2 are the same as the distance D1 and the width L1, respectively, and therefore will not be described again.

參閱圖7、9、10、11，需要說明的是，由於該開口70用於使該背面匯流電極段6的主體部63可外露，並且所述焊帶導線14的寬度W6小於該開口70的接合區 61的寬度W7，進而在焊接所述焊帶導線14時，所述焊帶導線14的第二導線段142可通過該開口70而焊接結合在該主體部63上。 Referring to FIGS. 7, 9, 10, and 11, it is to be noted that the opening 70 is used to expose the main body portion 63 of the back surface bus electrode segment 6, and the width W6 of the ribbon conductor 14 is smaller than the opening 70. Junction area The width W7 of the 61, and further the second wire segment 142 of the ribbon wire 14 can be welded to the body portion 63 through the opening 70 when the ribbon conductor 14 is soldered.

另外，在設計上，由於該開口70主要是作為之後所述焊帶導線14可能延伸經過的區域，將該第一延伸部61與該第二延伸部62設置該開口70外，也就是該第一延伸部61與該第二延伸部62皆不外露於該開口70，前述結構可減少所述焊帶導線14和『該集電極層7因覆蓋於該第一延伸部61的延伸子部611與該第二延伸部62的延伸子部621上所形成之高起區域』相重疊的機會，藉以有效避免造成所述焊帶導線14與該主體部63之間產生架空結構，所導致有效的焊接接觸面積變少而降低兩者之間的焊接結合強度等問題。 In addition, in the design, since the opening 70 is mainly as a region where the solder ribbon wire 14 may extend later, the first extending portion 61 and the second extending portion 62 are disposed outside the opening 70, that is, the first An extension portion 61 and the second extension portion 62 are not exposed to the opening 70. The foregoing structure can reduce the strip conductor 14 and the collector layer 7 from the extension portion 611 covering the first extension portion 61. An opportunity to overlap with the raised region formed on the extended sub-portion 621 of the second extension portion 62, thereby effectively avoiding an overhead structure between the ribbon conductor 14 and the main body portion 63, resulting in an effective The welding contact area is reduced to reduce problems such as the weld bonding strength between the two.

進一步說明的是，當該第一延伸部61的延伸子部611在該第二方向X上的距離D3過短時，所述延伸子部611恐外露於該開口70而與所述焊帶導線14重疊；又當該第二延伸部62的延伸子部621在該第二方向X上的距離D4過短時，所述延伸子部621恐外露於該開口70而與所述焊帶導線14重疊，前述結構將產生上述焊接結合強度降低的問題。 It is further explained that when the distance D3 of the extended sub-portion 611 of the first extending portion 61 in the second direction X is too short, the extended sub-portion 611 is exposed to the opening 70 and the lead-band wire 14 overlapping; when the distance D4 of the extended sub-portion 621 of the second extension portion 62 in the second direction X is too short, the extension sub-section 621 is exposed to the opening 70 and the ribbon conductor 14 Overlapping, the foregoing structure will cause a problem in that the above-described weld bonding strength is lowered.

一般來說，在該第二方向X上，所述焊帶導線14的寬度W6大於該主體部63的寬度W1的40%以上至65%以下。為此，在實施上，該等端緣630、630’的第一連接處631和第二連接處632的距離D1、D2至少大於該主體部 63的寬度W1之40%。 Generally, in the second direction X, the width W6 of the ribbon conductor 14 is greater than 40% to 65% of the width W1 of the body portion 63. To this end, in practice, the distances D1, D2 of the first connection 631 and the second connection 632 of the end edges 630, 630' are at least larger than the main body The width of 63 is 40% of W1.

由於該第一延伸部61的延伸子部611分別由該端緣630的第一連接處631和第二連接處632沿該第一方向Y延伸，因此，該第一延伸部61的延伸子部611在該第二方向X上的距離D3與該距離D1相同，皆為至少大於該主體部63的寬度W1之40%。同樣地，由於該第二延伸部62的延伸子部621分別由該端緣630’的第一連接處631和第二連接處632沿該第一方向Y延伸，因此，該第二延伸部62的延伸子部621在該第二方向X上的距離D4與該距離D2相同，皆為至少大於該主體部63的寬度W1之40%。 Since the extending sub-portion 611 of the first extending portion 61 extends from the first connecting portion 631 and the second connecting portion 632 of the end edge 630 respectively in the first direction Y, the extending portion of the first extending portion 61 The distance D3 of the 611 in the second direction X is the same as the distance D1, and is at least 40% larger than the width W1 of the main body portion 63. Similarly, since the extension sub-section 621 of the second extension portion 62 extends from the first connection portion 631 and the second connection portion 632 of the end edge 630' in the first direction Y, the second extension portion 62 The distance D4 of the extension sub-portion 621 in the second direction X is the same as the distance D2, and is at least 40% larger than the width W1 of the main body portion 63.

較佳地，該等距離D1、D2、D3、D4可大於該主體部63的寬度W1之65%，進而可適用於大部分業者所提供的焊帶導線14，以避免該第一延伸部61與該第二延伸部62外露於該開口70所產生的問題。 Preferably, the equidistances D1, D2, D3, and D4 may be greater than 65% of the width W1 of the main body portion 63, and thus may be applied to the ribbon conductors 14 provided by most manufacturers to avoid the first extension portion 61. And the problem that the second extension portion 62 is exposed to the opening 70.

在本實施例中，該等端緣630、630’的第一連接處631和第二連接處632的距離D1、D2大於該主體部63的寬度W1，該第一延伸部61的延伸子部611在該第二方向X上的距離D3大於該主體部63的寬度W1，該第二延伸部62的延伸子部621在該第二方向X上的距離D4大於該主體部63的寬度W1。 In this embodiment, the distances D1 and D2 of the first connection portion 631 and the second connection portion 632 of the end edges 630, 630' are larger than the width W1 of the main body portion 63, and the extension portion of the first extension portion 61 The distance D3 in the second direction X is greater than the width W1 of the main body portion 63, and the distance D4 of the extended sub-portion 621 of the second extending portion 62 in the second direction X is greater than the width W1 of the main body portion 63.

需要提醒的是，在本實施例所揭露的態樣中，每一組相互位置對應且重疊的開口70與背面匯流電極段6中，該開口70沿該第一方向Y的兩端結構相同，也就是該第一露出區72與該第二露出區73的形狀、大小相同；該 背面匯流電極段6沿該第一方向Y的兩端結構相同，也就是該第一延伸部61與該第二延伸部62的形狀、大小相同。 It should be noted that, in the aspect disclosed in the embodiment, each of the openings 70 and the back surface bus electrode segments 6 corresponding to each other and overlapping each other has the same structure at both ends of the opening 70 along the first direction Y. That is, the shape and size of the first exposed area 72 and the second exposed area 73 are the same; The two ends of the back bus electrode segment 6 along the first direction Y have the same structure, that is, the shape and size of the first extension portion 61 and the second extension portion 62 are the same.

不過在實施上，該第二露出區73也可具有與該第一露出區72不同的結構，該第二延伸部62也可具有與該第一延伸部61不同的結構。除此之外，該背面匯流電極段6也可僅具有該主體部63與該第一延伸部61，而不具有該第二延伸部62；該開口70也可僅具有該接合區71與該第一露出區72，而不具有該第二露出區73。 However, in practice, the second exposed area 73 may have a different structure from the first exposed area 72. The second extended portion 62 may also have a different structure from the first extended portion 61. In addition, the back side bus electrode segment 6 may have only the main body portion 63 and the first extension portion 61 without the second extension portion 62; the opening 70 may also have only the joint region 71 and the The first exposed area 72 does not have the second exposed area 73.

參閱圖12，以形狀來看，該開口70可區分為矩形的一基部74，以及由該基部74之相反兩端向外弧凸的一第一擴張部75與一第二擴張部76。在圖式中，以假想線區分該基部74、該第一擴張部75與該第二擴張部76。該第一露出區72(見圖9)為該第一擴張部75的一部分，該第二露出區73(見圖9)為該第二擴張部76的一部分。於垂直該第二方向X上，該第一擴張部75的最大長度L3大於該基部74的長度L4，該第二擴張部76的最大長度L5大於該基部74的長度L4。 Referring to FIG. 12, the opening 70 can be divided into a rectangular base portion 74 and a first expansion portion 75 and a second expansion portion 76 which are outwardly curved from opposite ends of the base portion 74. In the drawings, the base portion 74, the first expansion portion 75, and the second expansion portion 76 are distinguished by an imaginary line. The first exposed area 72 (see FIG. 9) is part of the first expanded portion 75, and the second exposed area 73 (see FIG. 9) is part of the second expanded portion 76. In the second direction X perpendicular to the vertical direction, the maximum length L3 of the first expansion portion 75 is greater than the length L4 of the base portion 74, and the maximum length L5 of the second expansion portion 76 is greater than the length L4 of the base portion 74.

參閱圖7、8、9，在使用上，透過該光電轉換基板2之背面22形成位置分別對應於該第一露出區72與該第二露出區73的該數個露出表面221，由於該數個露出表面221是沿著所述焊帶導線14的延伸方向排列，並且該數個露出表面221不被該背面匯流電極段6所覆蓋，亦不被該集電極層7所覆蓋，前述設計可避免在所述焊帶導線 14的延伸方向(即該第一方向X)上，該背面匯流電極段6與該集電極層7重疊而產生的局部凸起的結構，進而避免焊接所述焊帶導線14於該太陽能電池13上時因前述局部凸起的結構造成所述焊帶導線14架空的問題，並提升所述焊帶導線14與該背面匯流電極段6的主體部63之間的有效結合面積及焊接結合力，同時降低該太陽能電池13封裝為模組時的模組破片率。 Referring to FIGS. 7, 8, and 9, in use, the rear surface 22 of the photoelectric conversion substrate 2 is formed to correspond to the plurality of exposed surfaces 221 of the first exposed area 72 and the second exposed area 73, respectively. The exposed surfaces 221 are arranged along the extending direction of the strip conductors 14, and the plurality of exposed surfaces 221 are not covered by the back side bus electrode segments 6 and are not covered by the collector layer 7. The foregoing design may be Avoid the wire in the strip a partially convex structure formed by overlapping the back surface bus electrode segment 6 and the collector layer 7 in the extending direction of the first direction (ie, the first direction X), thereby avoiding soldering the solder ribbon wire 14 to the solar cell 13 In the above, the problem of the overhead of the ribbon conductor 14 is caused by the above-mentioned partially convex structure, and the effective bonding area and the welding bonding force between the ribbon conductor 14 and the main body portion 63 of the back surface bus electrode section 6 are improved. At the same time, the module fragmentation rate when the solar cell 13 is packaged as a module is reduced.

進一步地，本實施例還對應地對該背面匯流電極段6的結構進行改良，在該背面匯流電極段6的主體部63的兩端形成分別形成該第一延伸部61與該第二延伸部62，並且該第一延伸部61與該主體部63共同圈圍該第一露出區72，該第二延伸部62與該主體部63共同圈圍該第二露出區73。透過前述創新的結構設計協助收集該光電轉換基板2內對應所述露出表面221的部位所生成的載子，縮短前述部位所生成的載子的移動路徑，因而可降低載子復合機率，提升電流收集效果及模組封裝輸出功率。 Further, in this embodiment, the structure of the back surface bus electrode segment 6 is modified correspondingly, and the first extension portion 61 and the second extension portion are respectively formed at the two ends of the main body portion 63 of the back surface bus electrode segment 6 respectively. 62. The first extending portion 61 and the main body portion 63 together enclose the first exposed area 72. The second extending portion 62 and the main body portion 63 jointly enclose the second exposed area 73. Through the above-mentioned innovative structural design, the carrier generated by the portion corresponding to the exposed surface 221 in the photoelectric conversion substrate 2 is collected, and the moving path of the carrier generated by the above portion is shortened, thereby reducing the carrier composite probability and increasing the current. Collect effects and module package output power.

較佳地，該第一延伸部61的遠端610與該主體部63在沿該第一方向Y上分別位於該第一露出區72之兩側；該第二延伸部62的遠端610與該主體部63在沿該第一方向Y上分別位於該第二露出區73之兩側，前述結構可確保該第一延伸部61能收集該光電轉換基板2內對應該第一露出區72且遠離該主體部63的部位所產生的載子，以及確保該第二延伸部62能收集該光電轉換基板2內對應該第一露出區72且遠離該主體部63的部位所產生的載子。 Preferably, the distal end 610 of the first extending portion 61 and the main body portion 63 are respectively located on opposite sides of the first exposed area 72 along the first direction Y; the distal end 610 of the second extending portion 62 is The main body portion 63 is located on both sides of the second exposed region 73 along the first direction Y. The foregoing structure ensures that the first extending portion 61 can collect the corresponding first exposed region 72 in the photoelectric conversion substrate 2 and A carrier generated at a portion away from the main body portion 63 and a carrier generated by the second extension portion 62 to collect a portion of the photoelectric conversion substrate 2 corresponding to the first exposed region 72 and away from the main body portion 63.

除此之外，由於載子大致上需要到達該主體部63後再經由所述焊帶導線14向外導出，當該背面匯流電極段6的材料選用銀時，該背面匯流電極段6將具有較低電阻的特性，此時，載子可經由低電阻的該第一延伸部61與該第二延伸部62到達該主體部63，而不用經由導電性較該背面匯流電極段6差的所述集電極層7或所述光電轉換基板2，藉此降低載子複合機會，進而提升電池的光電轉換效率。 In addition, since the carrier generally needs to reach the main body portion 63 and then be outwardly led out through the ribbon conductor 14, when the material of the back surface bus electrode segment 6 is silver, the back surface bus electrode segment 6 will have The lower resistance characteristic, at this time, the carrier can reach the main body portion 63 via the first extension portion 61 and the second extension portion 62 of the low resistance, without the difference in conductivity compared with the back surface bus electrode segment 6. The collector layer 7 or the photoelectric conversion substrate 2 is described, thereby reducing the carrier recombination opportunity, thereby improving the photoelectric conversion efficiency of the battery.

參閱圖13，本發明太陽能電池模組之一第二實施例，與該第一實施例大致相同，該第一露出區72的外邊721及該第二露出區73的外邊731皆呈弧狀，兩者之間的差別在於：該第一延伸部61的形狀對應該第一露出區72，也就是該第一延伸部61由該主體部63的其中一端緣630的第一連接處631向外延伸，並且呈弧彎線狀而連接至該端緣630的第二連接處632。該第二延伸部62的形狀對應該第二露出區73，也就是該第二延伸部62由該主體部63的另一端緣630’的第一連接處631向外延伸，並且呈弧彎線狀而連接至該端緣630’的第二連接處632。 Referring to FIG. 13 , a second embodiment of the solar cell module of the present invention is substantially the same as the first embodiment, and the outer edge 721 of the first exposed region 72 and the outer edge 731 of the second exposed region 73 are arc-shaped. The difference between the two is that the shape of the first extension 61 corresponds to the first exposed area 72, that is, the first extension 61 is outwardly connected by the first joint 631 of the one end edge 630 of the main body portion 63. Extending and arcuately connected to the second junction 632 of the end edge 630. The shape of the second extension portion 62 corresponds to the second exposed area 73, that is, the second extension portion 62 extends outward from the first joint 631 of the other end edge 630' of the main body portion 63, and is curved. The second connection 632 is connected to the end edge 630'.

參閱圖14，本發明太陽能電池模組之一第三實施例，與該第二實施例大致相同，兩者之間的差別在於：本實施例的第一延伸部61與第二延伸部62皆不具有所述連接子部612、622(見圖9、13)。 Referring to FIG. 14, a third embodiment of the solar cell module of the present invention is substantially the same as the second embodiment, and the difference between the two is that the first extension portion 61 and the second extension portion 62 of the embodiment are both There are no such connection sub-portions 612, 622 (see Figures 9, 13).

該第一延伸部61具有分別由該端緣630的第一連接處631與第二連接處632彎弧相向延伸的兩個延伸子 部611，每一延伸子部611皆具有遠離於該主體部63的一遠端610。該第二延伸部62具有分別由該端緣630’的第一連接處631與第二連接處632彎弧相向延伸的兩個延伸子部621，每一延伸子部621皆具有遠離於該主體部63的一遠端620。 The first extension portion 61 has two extensions respectively extending from the first connection portion 631 of the end edge 630 and the second connection portion 632. The portion 611 has a distal end 610 away from the main body portion 63. The second extending portion 62 has two extending sub-ports 621 extending from the first connecting portion 631 of the end edge 630' and the second connecting portion 632, and each extending sub-portion 621 has a distance away from the main body. A distal end 620 of portion 63.

值得一提的是，本實施例的第一延伸部61與第二延伸部62皆不具有所述連接子部612、622(見圖9、13)，並令該第一延伸部61與該第二延伸部62的延伸子部611、621位於該焊帶導線14的第二導線段142在垂直該光電轉換基板2的背面22(見圖8)的方向上的投影面積外。前述結構可確保所述焊帶導線14延伸範圍無該第一延伸部61與該第二延伸部62通過，從而可避免所述焊帶導線14和『該集電極層7因覆蓋於所述連接子部612、622上所形成之高起區域』相重疊的機會，藉以有效避免造成所述焊帶導線14與該主體部63之間產生架空結構，所導致有效的焊接接觸面積變少而降低兩者之間的焊接結合強度等問題。 It should be noted that the first extension portion 61 and the second extension portion 62 of the embodiment do not have the connection sub-portions 612, 622 (see FIGS. 9, 13), and the first extension portion 61 and the first extension portion 61 The extended sub-portions 611, 621 of the second extension portion 62 are located outside the projected area of the second wire segment 142 of the ribbon conductor 14 in a direction perpendicular to the back surface 22 (see FIG. 8) of the photoelectric conversion substrate 2. The foregoing structure can ensure that the strip conductor 14 extends beyond the first extension portion 61 and the second extension portion 62, thereby avoiding the solder ribbon wire 14 and the collector layer 7 being covered by the connection. The raised regions formed on the sub-portions 612, 622 overlap, thereby effectively avoiding an overhead structure between the ribbon conductor 14 and the body portion 63, resulting in an effective reduction in the effective solder contact area. Problems such as the strength of the weld joint between the two.

參閱圖15，本發明太陽能電池模組之一第四實施例，與該第一實施例大致相同，兩者之間的差別在於：該第一延伸部61還具有遠離該開口70的一外邊613，該外邊613具有位於該兩個延伸子部611的兩個延伸子部外邊614，以及位於該連接子部612的連接子部外邊615。該兩個延伸子部外邊614分別切齊該主體部63的該兩個側邊633。 Referring to FIG. 15, a fourth embodiment of the solar cell module of the present invention is substantially the same as the first embodiment. The difference between the two is that the first extending portion 61 further has an outer edge 613 away from the opening 70. The outer edge 613 has two outer edges 614 located on the two extending sub-portions 611 and an outer side 615 of the connecting sub-section of the connecting sub-portion 612. The two extension sub-outer edges 614 respectively align the two side edges 633 of the main body portion 63.

該第二延伸部62還具有遠離該開口70的一外邊623，該外邊623具有位於該兩個延伸子部621的兩個延伸子部外邊624，以及位於該連接子部622的連接子部外邊625。該兩個延伸子部外邊624分別切齊該主體部63的該兩個側邊633。 The second extending portion 62 further has an outer edge 623 away from the opening 70. The outer edge 623 has two outer edges 624 located at the two extending sub-portions 621, and is located outside the connecting sub-section of the connecting sub-portion 622. 625. The two extension sub-outsets 624 respectively align the two side edges 633 of the main body portion 63.

除此之外，以形狀來看，該開口70可區分為矩形的一基部74，以及由該基部74之相反兩端向外弧凸的一第一收縮部77與一第二收縮部78。在圖式中，以假想線區分該基部74、該第一收縮部77與該第二收縮部78。在該第二方向X上，該第一收縮部77的最大長度L6小於該基部74的長度L4，該第二收縮部78的最大長度L7小於該基部74的長度L4。 In addition, the opening 70 can be divided into a rectangular base portion 74 and a first constricted portion 77 and a second constricted portion 78 which are outwardly curved from opposite ends of the base portion 74. In the drawings, the base portion 74, the first constricted portion 77, and the second constricted portion 78 are distinguished by an imaginary line. In the second direction X, the maximum length L6 of the first constricted portion 77 is smaller than the length L4 of the base portion 74, and the maximum length L7 of the second constricted portion 78 is smaller than the length L4 of the base portion 74.

在本實施例中，令所述延伸子部外邊614、624切齊該主體部63的側邊633，可降低在製造該背面匯流電極段6的網印製程時所使用的網版的損壞機率。這是因為所述網版的乳劑層上通常形成有用於供導電漿料通過以形成該背面匯流電極段6的落料開口，因應所述延伸子部外邊614、624切齊該主體部63的側邊633的設計，所述落料開口的側邊也可對應的呈直線狀，避免乳劑層形成凸出狀結構，進而避免網版印刷時所使用的刮刀容易傷害前述凸出狀結構而造成所述網版壞損的問題。 In this embodiment, the outer edge 614, 624 of the extended sub-section is aligned with the side 633 of the main body portion 63, which can reduce the probability of damage of the screen used in the screen printing process for manufacturing the back side bus electrode segment 6. . This is because the emulsion layer of the screen is usually formed with a blank opening for the conductive paste to pass through to form the back surface bus electrode segment 6, in response to the outer edge portions 614, 624 of the extension portion being aligned with the body portion 63. The design of the side edge 633, the side of the blanking opening can also be linear, avoiding the formation of a convex structure of the emulsion layer, thereby avoiding the blade used in the screen printing to easily damage the protruding structure. The problem of the screen being damaged.

參閱圖16，本發明太陽能電池模組之一第五實施例，與該第四實施例大致相同，兩者之間的差別在於：該背面匯流電極段6的主體部63呈矩形，該主體部63的 端緣630、630’皆沿該第二方向X延伸。該開口70呈矩形，該開口70的第一露出區72、第二露出區73與接合區71皆呈矩形。需要說明的是，在本發明所列舉的所有實施例中，所述開口70與所述主體部63的兩端或一端皆可如同本實施例所揭露地設計呈矩形狀結構，所以在實施上不以各實施例所揭露的弧形狀結構為限。 Referring to FIG. 16, a fifth embodiment of the solar cell module of the present invention is substantially the same as the fourth embodiment, and the difference between the two is that the main body portion 63 of the back surface bus electrode segment 6 has a rectangular shape, and the main body portion 63 End edges 630, 630' all extend along the second direction X. The opening 70 has a rectangular shape, and the first exposed area 72, the second exposed area 73 and the joint area 71 of the opening 70 are both rectangular. It should be noted that, in all the embodiments of the present invention, the opening 70 and the two ends or one end of the main body portion 63 can be designed as a rectangular structure as disclosed in the embodiment, so that the implementation is It is not limited to the arc shape structure disclosed in the respective embodiments.

參閱圖17，本發明太陽能電池模組之一第六實施例，與該第四實施例大致相同，兩者之間的差別在於：本實施例的第一延伸部61與第二延伸部62分別皆不具有所述連接子部612、622(見圖15)。 Referring to FIG. 17, a sixth embodiment of the solar cell module of the present invention is substantially the same as the fourth embodiment, and the difference between the two is that the first extension portion 61 and the second extension portion 62 of the embodiment respectively None of the connection sub-portions 612, 622 (see Figure 15).

該第一延伸部61具有分別由該端緣630的第一連接處631與第二連接處632沿該第一方向Y向外延伸的兩個延伸子部611，每一延伸子部611皆具有遠離於該主體部63的一遠端610。在該第一方向Y，該兩個遠端610至該第一露出區72的最短距離D10為300~400μm。 The first extension portion 61 has two extending sub-sections 611 extending outward from the first connection portion 631 and the second connection portion 632 of the end edge 630 in the first direction Y, each of the extension sub-sections 611 having A distal end 610 is remote from the body portion 63. In the first direction Y, the shortest distance D10 between the two distal ends 610 to the first exposed area 72 is 300-400 μm.

為了顧及網印精度的容許範圍，所述最短距離D10宜為300μm以上。另一方面，由於該第一延伸部61接觸該光電轉換基板2之背面21(見圖8)處的位置，受到該第一延伸部61的遮擋，該集電極層7覆蓋於該第一延伸部61之部位不接觸該背面21，從而使前述位置不會形成該背表面電場5(見圖8)，又因為背表面電場5，能降低少數載子的表面複合速率及增加多數載子的橫向傳輸能力以提升載子收集效率，進而提升電池的光電轉換效率，因此，所述最短距離D10宜為400μm以下。 In order to take into consideration the allowable range of the screen printing accuracy, the shortest distance D10 is preferably 300 μm or more. On the other hand, since the first extension portion 61 contacts the position at the back surface 21 (see FIG. 8) of the photoelectric conversion substrate 2, it is blocked by the first extension portion 61, and the collector layer 7 covers the first extension portion. The portion of the portion 61 does not contact the back surface 21, so that the aforementioned position does not form the back surface electric field 5 (see FIG. 8), and because the back surface electric field 5 can reduce the surface recombination rate of the minority carriers and increase the majority of the carriers. The lateral transmission capability improves the carrier collection efficiency, thereby improving the photoelectric conversion efficiency of the battery. Therefore, the shortest distance D10 is preferably 400 μm or less.

該第二延伸部62具有分別由該端緣630’的第一連接處631與該第二連接處632沿該第一方向Y向外延伸的兩個延伸子部621，每一延伸子部621皆具有遠離於該主體部63的一遠端620。在該第一方向Y，該兩個遠端620至該第二露出區73的最短距離D11為300~400μm。至於所述最短距離D11之數值上下限的臨界意義相同於所述最短距離D10，故不再贅述。 The second extension portion 62 has two extending sub-sections 621 extending outward from the first connection portion 631 and the second connection portion 632 of the end edge 630', respectively, in the first direction Y, and each extension sub-section 621 Each has a distal end 620 that is remote from the body portion 63. In the first direction Y, the shortest distance D11 between the two distal ends 620 to the second exposed regions 73 is 300 to 400 μm. As for the critical value of the upper and lower limits of the shortest distance D11, the critical meaning is the same as the shortest distance D10, and therefore will not be described again.

當然，在實施上，該第一延伸部61還可具有更多個延伸子部611，該第二延伸部62也還可具有更多個延伸子部621，因而不以本實施例所揭露的兩個為限。 Of course, in the implementation, the first extending portion 61 may further have more extending sub-portions 611, and the second extending portion 62 may also have more extending sub-portions 621, and thus are not disclosed in the embodiment. Two are limited.

令該第一延伸部61與該第二延伸部62的延伸子部611、621位於該焊帶導線14的第二導線段142在垂直該光電轉換基板2的背面22(見圖8)的方向上的投影面積外。前述結構可確保所述焊帶導線14延伸範圍無該第一延伸部61與該第二延伸部62通過，從而可避免所述焊帶導線14和『該集電極層7因覆蓋於所述連接子部612、622上所形成之高起區域』相重疊的機會，藉以有效避免造成所述焊帶導線14與該主體部63之間產生架空結構，所導致有效的焊接接觸面積變少而降低兩者之間的焊接結合強度等問題。 The extending portions 611, 621 of the first extending portion 61 and the second extending portion 62 are located in the direction of the second wire segment 142 of the ribbon conductor 14 in a direction perpendicular to the back surface 22 of the photoelectric conversion substrate 2 (see FIG. 8). Outside the projected area. The foregoing structure can ensure that the strip conductor 14 extends beyond the first extension portion 61 and the second extension portion 62, thereby avoiding the solder ribbon wire 14 and the collector layer 7 being covered by the connection. The raised regions formed on the sub-portions 612, 622 overlap, thereby effectively avoiding an overhead structure between the ribbon conductor 14 and the body portion 63, resulting in an effective reduction in the effective solder contact area. Problems such as the strength of the weld joint between the two.

參閱圖18，本發明太陽能電池模組之一第七實施例，與該第四實施例大致相同，兩者之間的差別在於：該第一延伸部61的形狀對應該第一露出區72，也就是該第一延伸部61由該主體部63的其中一端緣630的第一連 接處631向外延伸，並且呈弧彎線狀而連接至該端緣630的第二連接處632。該第二延伸部62的形狀對應該第二露出區73，也就是該第二延伸部62由該主體部63的另一端緣630’的第一連接處631向外延伸，並且呈弧彎線狀而連接至該端緣630’的第二連接處632。 Referring to FIG. 18, a seventh embodiment of the solar cell module of the present invention is substantially the same as the fourth embodiment. The difference between the two is that the shape of the first extending portion 61 corresponds to the first exposed region 72. That is, the first extension portion 61 is the first connection of the one end edge 630 of the main body portion 63. The joint 631 extends outwardly and is arcuately connected to the second joint 632 of the end edge 630. The shape of the second extension portion 62 corresponds to the second exposed area 73, that is, the second extension portion 62 extends outward from the first joint 631 of the other end edge 630' of the main body portion 63, and is curved. The second connection 632 is connected to the end edge 630'.

參閱圖19，本發明太陽能電池模組之一第八實施例，與該第四實施例大致相同，兩者之間的差別在於：該第一延伸部61的該兩個延伸子部外邊614分別不與該主體部63的兩個側邊633切齊，在該第二方向X上，該兩個延伸子部外邊614的距離D5小於該主體部63的寬度W1(即該兩個側邊633的距離)。該第二延伸部62的該兩個延伸子部外邊624分別不與該主體部63的兩個側邊633切齊，在該第二方向X上，該兩個延伸子部外邊624的距離D6小於該主體部63的寬度W1。 Referring to FIG. 19, an eighth embodiment of the solar cell module of the present invention is substantially the same as the fourth embodiment, and the difference between the two is that the outer edges 614 of the two extended sub-sections of the first extending portion 61 are respectively Not being aligned with the two side edges 633 of the main body portion 63. In the second direction X, the distance D5 of the outer edges 614 of the two extending sub-sections is smaller than the width W1 of the main body portion 63 (ie, the two side edges 633) the distance). The two extending sub-outer edges 624 of the second extending portion 62 are not respectively aligned with the two side edges 633 of the main body portion 63. In the second direction X, the distance D6 of the outer edges of the two extending sub-portions 624 It is smaller than the width W1 of the main body portion 63.

參閱圖5、6、19，具體來說，在該第二方向X上，每一端緣630、630’的第一連接處631和第二連接處632的距離D1、D2大於該主體部63的寬度W1之40%且小於該主體部63於第二方向X上的最大長度(即該寬度W1之100%)。更佳地，可令該第一延伸部61與該第二延伸部62的延伸子部611、621同時位於該正面匯流電極41在垂直該受光面21(見圖8)的方向上的投影面積內。 Referring to FIGS. 5, 6, and 19, in particular, in the second direction X, the distances D1, D2 of the first joint 631 and the second joint 632 of each end edge 630, 630' are greater than that of the main body portion 63. 40% of the width W1 and less than the maximum length of the main body portion 63 in the second direction X (i.e., 100% of the width W1). More preferably, the first extension portion 61 and the extension sub-portions 611, 621 of the second extension portion 62 are simultaneously located at a projection area of the front surface bus electrode 41 in a direction perpendicular to the light-receiving surface 21 (see FIG. 8). Inside.

一般來說，該集電極層7是由含鋁的導電漿料經燒結所製成，所述含鋁的導電漿料在接觸該光電轉換基板的背面時，鋁會擴散至該光電轉換基板2的背面側之內 而形成背表面電場5(見圖8)，前述背表面電場5的電阻抗較低而有助於載子的傳導。由於在該光電轉換基板2的背面22側設置有該第一延伸部61與該第二延伸部62的部位便無法設置該集電極層7，當然也就無法形成前述背表面電場5。 Generally, the collector layer 7 is formed by sintering an aluminum-containing conductive paste, and the aluminum-containing conductive paste diffuses to the photoelectric conversion substrate 2 when contacting the back surface of the photoelectric conversion substrate. Inside the back side The back surface electric field 5 (see FIG. 8) is formed, and the electric resistance of the back surface electric field 5 is low to facilitate the conduction of the carrier. Since the collector layer 7 cannot be provided on the side of the back surface 22 of the photoelectric conversion substrate 2 where the first extension portion 61 and the second extension portion 62 are provided, the back surface electric field 5 cannot be formed.

對應前述現象，本實施例使該第一延伸部61與該第二延伸部62的延伸子部611、621同時位於該正面匯流電極41在垂直該受光面的方向上的投影面積內。因為該受光面21(見圖8)披覆有該正面匯流電極41的部位將會受遮擋而無法受光，因此該光電轉換基板2於該正面匯流電極41在垂直該受光面21(見圖8)的方向上的投影面積內的區域內，其受光量相對較及其他未受遮擋的區域低，故所生成的載子量亦較低。因此在該正面匯流電極41的投影面積內形成所述延伸子部611、621，對於前述無法形成背表面電場5以收集載子的影響較低。亦即，在實施上，希望照光區(即正面匯流電極41之外)所對應的該背表面電場5儘量完整，並使讓所述延伸子部611、621儘量緊鄰照光區而不進入照光區。 Corresponding to the above phenomenon, in the embodiment, the first extension portion 61 and the extension sub-portions 611 and 621 of the second extension portion 62 are simultaneously located in a projected area of the front surface bus electrode 41 in a direction perpendicular to the light-receiving surface. Since the portion of the light-receiving surface 21 (see FIG. 8) that is covered with the front surface bus electrode 41 is blocked from being received by light, the photoelectric conversion substrate 2 is perpendicular to the light-receiving surface 21 at the front surface bus electrode 41 (see FIG. 8). In the region within the projected area in the direction, the amount of received light is relatively lower than that of other unobstructed regions, so the amount of carriers generated is also low. Therefore, the extension sub-portions 611 and 621 are formed in the projected area of the front surface bus electrode 41, and the influence of the back surface electric field 5 on the formation of the carrier is low. That is, in practice, it is desirable that the back surface electric field 5 corresponding to the illumination area (ie, outside the front side bus electrode 41) is as complete as possible, and that the extension sub-sections 611, 621 are placed as close as possible to the illumination area without entering the illumination area. .

需要注意的是，由於所述延伸子部611、621的數量可以為更多的，在此種實施方式中，應以讓所有延伸子部611、621接位於該正面匯流電極41在垂直該受光面的方向上的投影面積內的設計方式為佳。 It should be noted that since the number of the extension sub-portions 611, 621 can be more, in this embodiment, all the extension sub-portions 611, 621 should be placed at the front-side bus electrode 41 in the vertical direction. The design in the projected area in the direction of the face is preferred.

參閱圖20，本發明太陽能電池模組之一第九實施例，與該第八實施例大致相同，兩者之間的差別在於： 本實施例的第一延伸部61與第二延伸部62皆不具有所述連接子部612、622(見圖19)。 Referring to FIG. 20, a ninth embodiment of a solar cell module of the present invention is substantially the same as the eighth embodiment, and the difference between the two is: The first extension portion 61 and the second extension portion 62 of the embodiment do not have the connection sub-portions 612, 622 (see FIG. 19).

該第一延伸部61具有分別由該端緣630的第一連接處631與第二連接處632沿該第一方向Y向外延伸的兩個延伸子部611，每一延伸子部611皆具有遠離於該主體部63的一遠端610。該第二延伸部62具有分別由該端緣630’的第一連接處631與該第二連接處632沿該第一方向Y向外延伸的兩個延伸子部621，每一延伸子部621皆具有遠離於該主體部63的一遠端620。 The first extension portion 61 has two extending sub-sections 611 extending outward from the first connection portion 631 and the second connection portion 632 of the end edge 630 in the first direction Y, each of the extension sub-sections 611 having A distal end 610 is remote from the body portion 63. The second extension portion 62 has two extending sub-sections 621 extending outward from the first connection portion 631 and the second connection portion 632 of the end edge 630', respectively, in the first direction Y, and each extension sub-section 621 Each has a distal end 620 that is remote from the body portion 63.

參閱圖21，本發明太陽能電池模組之一第十實施例，與該第八實施例大致相同，兩者之間的差別在於：該第一延伸部61的形狀對應該第一露出區72，也就是該第一延伸部61由該主體部63的其中一端緣630的第一連接處631向外延伸，並且呈弧彎線狀而連接至該端緣630的第二連接處632。該第二延伸部62的形狀對應該第二露出區73，也就是該第二延伸部62由該主體部63的另一端緣630’的第一連接處631向外延伸，並且呈弧彎線狀而連接至該端緣630’的第二連接處632。 Referring to FIG. 21, a tenth embodiment of a solar cell module of the present invention is substantially the same as the eighth embodiment. The difference between the two is that the shape of the first extending portion 61 corresponds to the first exposed region 72. That is, the first extension portion 61 extends outward from the first joint 631 of the one end edge 630 of the main body portion 63, and is connected to the second joint portion 632 of the end edge 630 in an arcuate shape. The shape of the second extension portion 62 corresponds to the second exposed area 73, that is, the second extension portion 62 extends outward from the first joint 631 of the other end edge 630' of the main body portion 63, and is curved. The second connection 632 is connected to the end edge 630'.

參閱圖22，本發明太陽能電池模組之一第十一實施例，與該第一實施例大致相同，兩者之間的差別在於：該太陽能電池13還包含沿該第一方向Y延伸的數個第一連接電極81，每一第一連接電極81連接於兩相鄰的背面匯流電極段6之間。 Referring to FIG. 22, an eleventh embodiment of the solar cell module of the present invention is substantially the same as the first embodiment, and the difference between the two is that the solar cell 13 further includes a number extending along the first direction Y. Each of the first connection electrodes 81 is connected between two adjacent back surface bus electrode segments 6.

具體來說，該數個第一連接電極81之兩端分別 連接於其中一背面匯流電極段6的第一延伸部61的連接子部612與另一背面匯流電極段6的第二延伸部62的連接子部622。在實施上，每一第一連接電極81在該第二方向X上的寬度W8應大於50μm，並小於正面匯流電極41(見圖6)之寬度。藉由該數個第一連接電極81的增設，可增進收該太陽能電池13整體的載子收集效果，並提高模組封裝輸出功率。 Specifically, the two ends of the plurality of first connection electrodes 81 are respectively A connecting sub-portion 612 connected to the first extension portion 61 of one of the back side bus electrode segments 6 and a connecting sub-portion 622 of the second extension portion 62 of the other back side bus electrode section 6. In practice, the width W8 of each of the first connection electrodes 81 in the second direction X should be greater than 50 μm and smaller than the width of the front surface bus electrode 41 (see FIG. 6). By the addition of the plurality of first connection electrodes 81, the carrier collection effect of the entire solar cell 13 can be enhanced, and the module package output power can be improved.

在實施上，該太陽能電池13可以還包含更多個用於連接在於相鄰的背面匯流電極段6之間的連接電極，故連接在於相鄰的背面匯流電極段6之間的連接電極的數量不限於本實施例的舉例。 In practice, the solar cell 13 may further comprise a plurality of connection electrodes for connection between adjacent back side bus electrode segments 6, so that the number of connection electrodes connected between adjacent back side bus electrode segments 6 is connected. It is not limited to the examples of the embodiment.

參閱圖23，本發明太陽能電池模組之一第十二實施例，與該第六實施例(見圖17)大致相同，兩者之間的差別在於：該太陽能電池13還包含沿該第一方向Y延伸的數個第一連接電極81與數個第二連接電極82，該數個第一連接電極81與該第二連接電極82分別兩兩一組而連接於兩相鄰的背面匯流電極段6之間。 Referring to FIG. 23, a twelfth embodiment of the solar cell module of the present invention is substantially the same as the sixth embodiment (see FIG. 17), and the difference between the two is that the solar cell 13 further includes the first a plurality of first connection electrodes 81 extending in the direction Y and a plurality of second connection electrodes 82. The plurality of first connection electrodes 81 and the second connection electrodes 82 are respectively connected in two groups and connected to two adjacent back surface bus electrodes. Between segments 6.

具體來說，該數個第一連接電極81之兩端分別連接於其中一背面匯流電極段6的第一延伸部61的連接子部612與另一背面匯流電極段6的第二延伸部62的連接子部622。在該第二方向X上，第一連接電極81與相連之連接子部612、622的寬度皆相同。 Specifically, the two ends of the plurality of first connection electrodes 81 are respectively connected to the connection sub-portion 612 of the first extension portion 61 of one of the back surface bus electrode segments 6 and the second extension portion 62 of the other back surface bus electrode segment 6. Connection subsection 622. In the second direction X, the widths of the first connection electrode 81 and the connected connection sub-portions 612, 622 are the same.

該數個第二連接電極82之兩端分別連接於其中一背面匯流電極段6的第一延伸部61的連接子部612與另 一背面匯流電極段6的第二延伸部62的連接子部612。在該第二方向X上，第二連接電極82與相連之連接子部612、622的寬度皆相同。 Two ends of the plurality of second connection electrodes 82 are respectively connected to the connection sub-portion 612 of the first extension portion 61 of one of the back surface bus electrode segments 6 and another A connecting sub-portion 612 of the second extension 62 of the back side bus electrode segment 6. In the second direction X, the width of the second connecting electrode 82 and the connected connecting sub-portions 612, 622 are the same.

除此之外，該數個第一連接電極81與該數個第二連接電極82的外邊分別切齊與其連接的背面匯流電極段6。 In addition, the plurality of first connection electrodes 81 and the outer sides of the plurality of second connection electrodes 82 are respectively aligned with the back surface bus electrode segments 6 connected thereto.

參閱圖24，本發明太陽能電池模組之一第十三實施例，與該第九實施例(見圖20)大致相同，兩者之間的差別在於：該太陽能電池13還包含沿該第一方向Y延伸的數個第一連接電極81與數個第二連接電極82，該數個第一連接電極81與該第二連接電極82分別兩兩一組而連接於兩相鄰的背面匯流電極段6之間。 Referring to FIG. 24, a thirteenth embodiment of a solar cell module of the present invention is substantially the same as the ninth embodiment (see FIG. 20), and the difference between the two is that the solar cell 13 further includes the first a plurality of first connection electrodes 81 extending in the direction Y and a plurality of second connection electrodes 82. The plurality of first connection electrodes 81 and the second connection electrodes 82 are respectively connected in two groups and connected to two adjacent back surface bus electrodes. Between segments 6.

惟以上所述者，僅為本發明之實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及專利說明書內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。 However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

13‧‧‧太陽能電池 13‧‧‧Solar battery

6‧‧‧背面匯流電極段 6‧‧‧Backside bus electrode segment

61‧‧‧第一延伸部 61‧‧‧First Extension

610‧‧‧遠端 610‧‧‧Remote

611‧‧‧延伸子部 611‧‧‧Extensions

612‧‧‧連接子部 612‧‧‧Connected subsection

62‧‧‧第二延伸部 62‧‧‧Second extension

620‧‧‧遠端 620‧‧‧Remote

621‧‧‧延伸子部 621‧‧‧Extensions

622‧‧‧連接子部 622‧‧‧Connected subsection

63‧‧‧主體部 63‧‧‧ Main body

630‧‧‧端緣 630‧‧‧ edge

630’‧‧‧端緣 630’‧‧‧ edge

631‧‧‧第一連接處 631‧‧‧First connection

632‧‧‧第二連接處 632‧‧‧Second junction

633‧‧‧側邊 633‧‧‧ side

7‧‧‧集電極層 7‧‧‧ Collector layer

70‧‧‧開口 70‧‧‧ openings

71‧‧‧接合區 71‧‧‧ junction area

72‧‧‧第一露出區 72‧‧‧First exposed area

721‧‧‧外邊 721‧‧‧ outside

73‧‧‧第二露出區 73‧‧‧Second exposed area

731‧‧‧外邊 731‧‧‧ outside

Y‧‧‧第一方向 Y‧‧‧First direction

X‧‧‧第二方向 X‧‧‧second direction

W1、W7‧‧‧寬度 W1, W7‧‧‧ width

W10、W11‧‧‧寬度 W10, W11‧‧‧ width

D1、D2‧‧‧距離 D1, D2‧‧‧ distance

D8、D9‧‧‧距離 D8, D9‧‧‧ distance

L1、L2‧‧‧長度 L1, L2‧‧‧ length

Claims (21)

一種太陽能電池，包含：一光電轉換基板，包括彼此相反的一受光面與一背面；一正面電極，位於該受光面上；一背面匯流電極段，位於該背面上且沿一第一方向延伸，該背面匯流電極段包括一主體部及由該主體部延伸出的一第一延伸部；該第一延伸部之寬度小於該主體部之寬度，且該第一延伸部具有遠離該主體部之一遠端；及一集電極層，位於該背面，並包括與該背面匯流電極段重疊且沿該第一方向延伸的一開口；該開口可區分為與該主體部重疊之一接合區，以及與該主體部不重疊之一第一露出區；該第一露出區位於該開口在沿該第一方向上之一端；該第一延伸部的遠端與該主體部在沿該第一方向上分別位於該第一露出區之兩側。 A solar cell comprising: a photoelectric conversion substrate comprising a light receiving surface and a back surface opposite to each other; a front surface electrode on the light receiving surface; and a back surface bus electrode segment on the back surface and extending along a first direction The back side bus electrode segment includes a body portion and a first extension portion extending from the body portion; the first extension portion has a width smaller than a width of the body portion, and the first extension portion has a distance away from the body portion a distal end; and a collector layer on the back surface, and including an opening overlapping the back side bus electrode segment and extending along the first direction; the opening may be divided into a joint area overlapping the body portion, and The main body portion does not overlap with one of the first exposed areas; the first exposed area is located at one end of the opening in the first direction; the distal end of the first extending portion and the main body portion are respectively along the first direction Located on both sides of the first exposed area. 如請求項1所述的太陽能電池，其中，該正面電極具有沿該第一方向延伸之一正面匯流電極，該第一延伸部位於該正面匯流電極在垂直該受光面的方向上的投影面積內。 The solar cell according to claim 1, wherein the front electrode has a front side bus electrode extending in the first direction, and the first extending portion is located in a projected area of the front side bus electrode in a direction perpendicular to the light receiving surface . 如請求項1所述的太陽能電池，其中，該第一延伸部與該第一露出區不重疊。 The solar cell of claim 1, wherein the first extension does not overlap the first exposed area. 如請求項1所述的太陽能電池，其中，該第一延伸部與 該主體部共同圈圍該第一露出區。 The solar cell of claim 1, wherein the first extension is The body portion collectively encircles the first exposed area. 如請求項1所述的太陽能電池，其中，該第一延伸部具有互相分離的兩延伸子部；於垂直該第一方向之一第二方向上，該兩延伸子部分別位於該第一露出區的相反兩側。 The solar cell of claim 1, wherein the first extension has two extending sub-sections separated from each other; and in a second direction perpendicular to the first direction, the two extension sub-sections are respectively located at the first exposure The opposite sides of the area. 如請求項1所述的太陽能電池，其中，該第一延伸部之延伸方式對應該第一露出區的一外邊之形狀。 The solar cell of claim 1, wherein the first extension extends in a shape corresponding to an outer edge of the first exposed area. 如請求項6所述的太陽能電池，其中，該第一露出區的該外邊呈弧狀。 The solar cell of claim 6, wherein the outer side of the first exposed area is curved. 如請求項1所述的太陽能電池，其中，該第一延伸部與該主體部於一第一連接處及一第二連接處相接；於垂直該第一方向之一第二方向上，該第一連接處和該第二連接處的距離大於該主體部的寬度之40%。 The solar cell of claim 1, wherein the first extension portion is in contact with the main body portion at a first connection and a second connection; in a second direction perpendicular to the first direction, the The distance between the first joint and the second joint is greater than 40% of the width of the body portion. 如請求項8所述的太陽能電池，其中，在該第二方向上，該第一連接處和該第二連接處的距離大於該主體部的寬度之65%。 The solar cell of claim 8, wherein in the second direction, the distance between the first joint and the second joint is greater than 65% of the width of the body portion. 如請求項9所述的太陽能電池，其中，在該第二方向上，該第一連接處和該第二連接處的距離大於該主體部的寬度。 The solar cell of claim 9, wherein in the second direction, the distance between the first connection and the second connection is greater than the width of the body portion. 如請求項1所述的太陽能電池，其中，該第一延伸部與該主體部於一第一連接處及一第二連接處相接；於垂直該第一方向之一第二方向上，該第一連接處和該第二連接處的距離小於該主體部於該第二方向上的最大長度。 The solar cell of claim 1, wherein the first extension portion is in contact with the main body portion at a first connection and a second connection; in a second direction perpendicular to the first direction, the The distance between the first joint and the second joint is less than the maximum length of the body portion in the second direction. 如請求項11所述的太陽能電池，其中，在該第二方向上，該第一連接處和該第二連接處的距離大於該第一露出區的長度。 The solar cell of claim 11, wherein in the second direction, the distance between the first connection and the second connection is greater than the length of the first exposed area. 如請求項1所述的太陽能電池，其中，該第一延伸部與該主體部於一第一連接處及一第二連接處相接；該主體部具有沿該第一方向延伸且彼此相反的兩個側邊；該第一延伸部具有遠離該開口的一外邊，該外邊與該兩個側邊切齊。 The solar cell of claim 1, wherein the first extension portion is in contact with the main body portion at a first connection portion and a second connection portion; the main body portion has an extension along the first direction and opposite to each other Two side edges; the first extension has an outer edge away from the opening, the outer edge being aligned with the two sides. 如請求項1至13中任一項所述的太陽能電池，其中，該集電極層還具有和該開口沿該第一方向排列的一另一開口；該太陽能電池還包含與該另一開口重疊的一另一背面匯流電極段；該太陽能電池還包含沿該第一方向延伸的一第一連接電極，且該第一連接電極連接該背面匯流電極段及該另一背面匯流電極段之間。 The solar cell of any one of claims 1 to 13, wherein the collector layer further has a further opening aligned with the opening in the first direction; the solar cell further comprising an overlap with the other opening And a further back side bus electrode segment; the solar cell further includes a first connecting electrode extending along the first direction, and the first connecting electrode is connected between the back side bus electrode segment and the other back side bus electrode segment. 如請求項14所述的太陽能電池，其中，該太陽能電池還包含沿該第一方向延伸的一第二連接電極，該第一連接電極與該第二連接電極連接於該背面匯流電極段及該另一背面匯流電極段之間。 The solar cell of claim 14, wherein the solar cell further comprises a second connection electrode extending along the first direction, the first connection electrode and the second connection electrode being connected to the back side bus electrode segment and the Between the other backside bus electrode segments. 如請求項14所述的太陽能電池，其中，該第一連接電極之兩端分別連接於該背面匯流電極的第一延伸部及該另一背面匯流電極。 The solar cell of claim 14, wherein both ends of the first connection electrode are respectively connected to the first extension portion of the back surface bus electrode and the other back surface bus electrode. 如請求項1至13中任一項所述的太陽能電池，其中，該背面匯流電極段還包括由該主體部延伸出且寬度小於該主體部之寬度的一第二延伸部，該第二延伸部具 有遠離該主體部之一遠端；該集電極層的開口還具有與該主體部不重疊之一第二露出區，該第二露出區位於該開口在沿該第一方向上相反於該第一露出區之一端；該第二延伸部的遠端與該主體部在沿該第一方向上分別位於該第二露出區之兩側。 The solar cell of any one of claims 1 to 13, wherein the backside bus electrode segment further comprises a second extension extending from the body portion and having a width smaller than a width of the body portion, the second extension Parts There is a distal end away from the body portion; the opening of the collector layer further has a second exposed area that does not overlap the main body portion, the second exposed area is located at the opening in the first direction opposite to the first One end of the exposed area; the distal end of the second extending portion and the main body portion are respectively located on both sides of the second exposed area in the first direction. 如請求項8至10中任一項所述的太陽能電池，其中，該開口可區分為一基部，以及由該基部之一端向外弧凸的一第一擴張部；於垂直該第二方向上，該第一擴張部的最大長度大於該基部的長度；該第一露出區為該第一擴張部的一部分。 The solar cell of any one of claims 8 to 10, wherein the opening is distinguishable as a base, and a first expansion portion convexly outwardly from one end of the base; in the second direction perpendicular to the second The maximum length of the first expanded portion is greater than the length of the base portion; the first exposed portion is a portion of the first expanded portion. 如請求項11或12所述的太陽能電池，其中，該開口可區分為一基部，以及由該基部之一端向外弧凸的一第一收縮部；於垂直該第二方向上，該第一收縮部的最大長度小於該基部的長度；該第一露出區為該第一收縮部的一部分。 The solar cell of claim 11 or 12, wherein the opening is separable into a base portion, and a first constricted portion that is convex outwardly from one end of the base portion; in the second direction perpendicular to the first direction, the first The maximum length of the constriction is less than the length of the base; the first exposed area is part of the first constriction. 一種太陽能電池模組，包含：相對設置的一第一板材與一第二板材；一第一太陽能電池與一第二太陽能電池，排列於該第一板材與該第二板材之間，該第二太陽能電池為如請求項1所述的太陽能電池；一焊帶導線，連接該第一太陽能電池與該第二太陽能電池，該焊帶導線包括連接該第一太陽能電池的一第一導線段，以及電性連接於該第二太陽能電池的背面匯流電極段的一第二導線段；及 一封裝材，位於該第一板材與該第二板材之間，並包覆在該第一太陽能電池、該第二太陽能電池及該焊帶導線的周圍。 A solar cell module comprising: a first plate and a second plate disposed oppositely; a first solar cell and a second solar cell arranged between the first plate and the second plate, the second The solar cell is the solar cell according to claim 1; a ribbon wire connecting the first solar cell and the second solar cell, the ribbon wire comprising a first wire segment connecting the first solar cell, and Electrically connected to a second wire segment of the back side bus electrode segment of the second solar cell; and An encapsulating material is disposed between the first plate and the second plate and wrapped around the first solar cell, the second solar cell, and the ribbon wire. 如請求項20所述的太陽能電池模組，其中，該第二太陽能電池的背面匯流電極段的第一延伸部位於該焊帶導線的第二導線段在垂直該第二太陽能電池的光電轉換基板的背面的方向上的投影面積外。 The solar cell module of claim 20, wherein the first extension of the back side bus electrode segment of the second solar cell is located at a second wire segment of the ribbon wire in a vertical direction of the photoelectric conversion substrate of the second solar cell The back side of the area is projected outside the area.