TW201947869A - Solar cell string and method for manufacturing the same - Google Patents
Solar cell string and method for manufacturing the same Download PDFInfo
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- TW201947869A TW201947869A TW107115302A TW107115302A TW201947869A TW 201947869 A TW201947869 A TW 201947869A TW 107115302 A TW107115302 A TW 107115302A TW 107115302 A TW107115302 A TW 107115302A TW 201947869 A TW201947869 A TW 201947869A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
本發明是有關於一種太陽能電池串及其製造方法，且特別是有關於一種太陽能電池串，在其之匯流電極與導電焊帶之間加入一單面金屬膠帶。 The invention relates to a solar cell string and a method for manufacturing the same, and more particularly to a solar cell string. A single-sided metal tape is added between a bus electrode and a conductive ribbon.
請參考圖1，習知太陽能電池模組9包括許多材料，例如正面玻璃板91、多個太陽能電池90、封裝材93、導電焊帶(ribbon)92、背面板材94等。目前該些太陽能電池90是以導電焊帶92作為串焊連接之用。為了焊接製程，在該些太陽能電池90之正面903及背面904都需設計有匯流電極(busbar)9031、9041，該導電焊帶92分別焊接於該正面903及背面904之匯流電極9031、9041的區域。焊接完該太陽能電池90之正面903後，須將該導電焊帶92轉折，焊接下一片太陽能電池90之背面904，重複數次，才算完成一串太陽能電池90的串焊製程。 Referring to FIG. 1, the conventional solar cell module 9 includes many materials, such as a front glass plate 91, a plurality of solar cells 90, a packaging material 93, a conductive ribbon 92, and a back plate 94. Currently, these solar cells 90 use conductive welding tapes 92 for serial welding connection. For the welding process, busbars 9031 and 9041 need to be designed on the front side 903 and the back side 904 of the solar cells 90. The conductive welding tape 92 is welded to the bus electrodes 9031 and 9041 of the front side 903 and the back side 904, respectively. region. After welding the front surface 903 of the solar cell 90, the conductive welding tape 92 must be turned, and the back surface 904 of the next solar cell 90 should be welded and repeated several times to complete the string welding process of a string of solar cells 90.
然而，當該導電焊帶92焊接於該匯流電極的區域時，該匯流電極9031、9041上的銅與該導電焊帶92上的錫焊料(solder)會形成金屬共晶。由於形成金屬共晶的反應過於劇烈，因此可能導致該太陽能電池90之矽基板破裂的發生，進而降低該匯流電極9031、9041與該導電焊帶92之間的附著力。 However, when the conductive solder tape 92 is soldered to the area of the bus electrode, the copper on the bus electrode 9031, 9041 and the tin solder on the conductive solder tape 92 will form a metal eutectic. Because the reaction of forming the metal eutectic is too violent, it may cause the silicon substrate of the solar cell 90 to crack, thereby reducing the adhesion between the bus electrodes 9031, 9041 and the conductive bonding tape 92.
因此，便有需要一種太陽能電池串及其製造方法，能克服上述問題。 Therefore, there is a need for a solar cell string and a method for manufacturing the same that can overcome the above problems.
本發明之一目的是提供一種太陽能電池串，在其之匯流電極與導電焊帶之間加入一單面金屬膠帶。 It is an object of the present invention to provide a solar cell string in which a single-sided metal tape is added between a bus electrode and a conductive bonding tape.
依據上述之目的，本發明提供一種太陽能電池串，包括：相鄰配置的一第一太陽能電池及一第二太陽能電池；一導電焊帶，附著配置於該第一太陽能電池之一第一表面以及該第二太陽能電池之一第二表面；以及一單面金屬膠帶，包括一金屬箔及附著於該金屬箔之一導電膠層，該單面金屬膠帶位於該第一表面與該導電焊帶之間，該導電膠層位於該金屬箔與該第一表面之間，且該導電焊帶直接附著於該金屬箔。 According to the above object, the present invention provides a solar cell string including: a first solar cell and a second solar cell disposed adjacently; a conductive welding tape attached to a first surface of the first solar cell; and A second surface of the second solar cell; and a single-sided metal tape including a metal foil and a conductive adhesive layer attached to the metal foil, the single-sided metal tape is located between the first surface and the conductive tape In the meantime, the conductive adhesive layer is located between the metal foil and the first surface, and the conductive solder tape is directly attached to the metal foil.
在該匯流電極與該導電焊帶之間加入本發明之單面金屬膠帶仍具有下列功能：應用在太陽能電池片之導電金屬線為銅電鍍製程時，可防止該匯流電極上的銅與該導電焊帶上的錫焊料在形成金屬共晶時，因反應過於劇烈而導致矽基板破裂的發生。因此，本發明之單面金屬膠帶可作為該匯流電極與該導電焊帶之間焊接時的緩衝，以提升該匯流電極與該導電焊帶之間較大的附著力。 Adding the single-sided metal tape of the present invention between the bus electrode and the conductive solder tape still has the following functions: When the conductive metal wire applied to the solar cell is a copper plating process, the copper on the bus electrode and the conductive material can be prevented. When the solder on the solder ribbon forms a metal eutectic, the silicon substrate cracks due to the reaction being too violent. Therefore, the single-sided metal tape of the present invention can be used as a buffer when welding between the bus electrode and the conductive welding tape, so as to improve the larger adhesion between the bus electrode and the conductive welding tape.
1‧‧‧太陽能電池串 1‧‧‧solar cell string
1’‧‧‧太陽能電池串 1’‧‧‧solar cell string
10‧‧‧太陽能電池 10‧‧‧ solar cell
10a‧‧‧太陽能電池 10a‧‧‧solar battery
10b‧‧‧太陽能電池 10b‧‧‧solar battery
101‧‧‧第一表面 101‧‧‧first surface
102‧‧‧第二表面 102‧‧‧Second surface
103‧‧‧第一電極層 103‧‧‧first electrode layer
1031‧‧‧匯流電極 1031‧‧‧bus electrode
1032‧‧‧指狀電極 1032‧‧‧finger electrode
104‧‧‧第二電極層 104‧‧‧Second electrode layer
11‧‧‧導電焊帶 11‧‧‧Conductive welding tape
111‧‧‧金屬核心 111‧‧‧ metal core
112‧‧‧焊料層 112‧‧‧solder layer
12‧‧‧單面金屬膠帶 12‧‧‧Single-sided metal tape
121‧‧‧金屬箔 121‧‧‧ metal foil
122‧‧‧導電膠層 122‧‧‧ conductive adhesive layer
9‧‧‧太陽能電池模組 9‧‧‧ solar cell module
90‧‧‧太陽能電池 90‧‧‧solar battery
903‧‧‧正面 903‧‧‧Front
9031‧‧‧匯流電極 9031‧‧‧bus electrode
904‧‧‧背面 904‧‧‧Back
9041‧‧‧匯流電極 9041‧‧‧bus electrode
91‧‧‧正面玻璃板 91‧‧‧ front glass
92‧‧‧導電焊帶 92‧‧‧Conductive welding tape
93‧‧‧封裝材 93‧‧‧Packaging material
94‧‧‧背面板材 94‧‧‧Back sheet
100A~100C‧‧‧步驟 100A ~ 100C‧‧‧step
圖1為習知太陽能電池模組之剖面示意圖。 FIG. 1 is a schematic cross-sectional view of a conventional solar cell module.
圖2為本發明之第一實施例之太陽能電池串之剖面示意圖。 FIG. 2 is a schematic cross-sectional view of a solar cell string according to a first embodiment of the present invention.
圖3為本發明之第一實施例之第一太陽能電池之平面示意圖。 FIG. 3 is a schematic plan view of a first solar cell according to a first embodiment of the present invention.
圖4為本發明之第一實施例之第一太陽能電池之部分剖面示意圖。 FIG. 4 is a schematic partial cross-sectional view of a first solar cell according to a first embodiment of the present invention.
圖5為本發明之另一實施例之第一太陽能電池之平面示意圖，其未顯示該導電焊帶。 FIG. 5 is a schematic plan view of a first solar cell according to another embodiment of the present invention, and the conductive welding tape is not shown.
圖6為本發明之第一實施例之第二太陽能電池之部分剖面示意圖。 FIG. 6 is a schematic partial cross-sectional view of a second solar cell according to the first embodiment of the present invention.
圖7為本發明之第二實施例之太陽能電池串之剖面示意圖。 FIG. 7 is a schematic cross-sectional view of a solar cell string according to a second embodiment of the present invention.
圖8為本發明之一實施例之太陽能電池串之製造方法之流程圖。 FIG. 8 is a flowchart of a method for manufacturing a solar cell string according to an embodiment of the present invention.
圖9為本發明之一實施例之太陽能電池串之製造方法之剖面示意圖，其顯示將一第一太陽能電池及一第二太陽能電池相鄰配置。 9 is a schematic cross-sectional view of a method for manufacturing a solar cell string according to an embodiment of the present invention, which shows that a first solar cell and a second solar cell are arranged adjacently.
圖10為本發明之第一實施例之太陽能電池串之製造方法之剖面示意圖，其顯示將一單面金屬膠帶貼附於該第一太陽能電池之第一表面上。 FIG. 10 is a schematic cross-sectional view of a method for manufacturing a solar cell string according to a first embodiment of the present invention, which shows that a single-sided metal tape is attached to a first surface of the first solar cell.
圖11為本發明之第一實施例之第一太陽能電池之平面示意圖，其顯示將一單面金屬膠帶貼附於該第一太陽能電池之第一表面上。 FIG. 11 is a schematic plan view of a first solar cell according to a first embodiment of the present invention, which shows that a single-sided metal tape is attached to a first surface of the first solar cell.
為讓本發明之上述目的、特徵和特點能更明顯易懂，茲配合圖式將本發明相關實施例詳細說明如下。 In order to make the foregoing objects, features, and characteristics of the present invention more comprehensible, the related embodiments of the present invention are described in detail below with reference to the drawings.
請參考圖2，其顯示本發明之第一實施例之太陽能電池串之剖面示意圖。該太陽能電池串1包括：多個太陽能電池10、至少一導電焊帶11及至少一單面金屬膠帶12。舉例，該些太陽能電池10包括相鄰配置的一第一太陽能電池10a及一第二太陽能電池10b，且為單面受光的太陽能電池。該導電焊帶11配置於該第一太陽能電池10a之第一表面101以及該第二太陽能電池10b之第二表面102。該第一表面101(例如背面)為一拋光表面，該第二表面102(例如正面)為一粗糙化表面，且該第一表面101和該第二表面102分別朝向該太陽能電池串1之不同面。 Please refer to FIG. 2, which is a schematic cross-sectional view of a solar cell string according to a first embodiment of the present invention. The solar cell string 1 includes a plurality of solar cells 10, at least one conductive welding tape 11, and at least one single-sided metal tape 12. For example, the solar cells 10 include a first solar cell 10a and a second solar cell 10b disposed adjacent to each other, and are single-sided solar cells. The conductive tape 11 is disposed on the first surface 101 of the first solar cell 10a and the second surface 102 of the second solar cell 10b. The first surface 101 (for example, the back surface) is a polished surface, the second surface 102 (for example, the front surface) is a roughened surface, and the first surface 101 and the second surface 102 face the difference of the solar cell string 1 respectively. surface.
該單面金屬膠帶12包括一金屬箔121及附著於該金屬箔121之一導電膠層122，該單面金屬膠帶12位於該第一表面101與該導電焊帶11之間，該導電膠層122位於該金屬箔121與該第一表面101之間，且該導電焊帶11直接附著(例如焊接)於該金屬箔121。舉例，該金屬箔121可為銅材料所製，該導電膠層122可包括一膠層及多個第一導電粒子，該膠層可為環氧樹脂(epoxy)材料所製，且該些導電粒子可為金屬材料所製，例如鋁 (Al)、銀(Ag)、銅(Cu)、金(Au)或其組合的群組。該些導電粒子分佈於該膠層內，藉此該些導電粒子可沿一施壓方向將該導電膠層122電性導通至該金屬箔121。此實施例之單面導電膠帶12只具有一層導電膠層。 The single-sided metal tape 12 includes a metal foil 121 and a conductive adhesive layer 122 attached to the metal foil 121. The single-sided metal tape 12 is located between the first surface 101 and the conductive solder tape 11. The conductive adhesive layer 122 is located between the metal foil 121 and the first surface 101, and the conductive soldering tape 11 is directly attached (eg, welded) to the metal foil 121. For example, the metal foil 121 may be made of a copper material, the conductive adhesive layer 122 may include an adhesive layer and a plurality of first conductive particles, the adhesive layer may be made of an epoxy material, and the conductive The particles may be made of a metal material, such as a group of aluminum (Al), silver (Ag), copper (Cu), gold (Au), or a combination thereof. The conductive particles are distributed in the adhesive layer, so that the conductive particles can electrically conduct the conductive adhesive layer 122 to the metal foil 121 along a pressing direction. The single-sided conductive tape 12 in this embodiment has only one conductive adhesive layer.
請參考圖3及圖4，其顯示本發明之第一實施例之第一太陽能電池之平面及部分剖面示意圖。該第一太陽能電池10a包括位於該第一表面101上之第一電極層103，該單面金屬膠帶12直接附著(例如黏接)於該第一電極層103，而該導電膠層122直接附著(例如黏接)於該第一電極層103。該第一電極層103包括一匯流電極1031及交叉相連於該匯流電極1031的多條指狀電極1032，該單面金屬膠帶12直接附著(例如黏接)於該匯流電極1031。該導電焊帶11包括一金屬核心111及包圍該金屬核心111之一焊料層112，且該焊料層112直接接觸該匯流電極1031之一區域。該金屬核心111可為銅金屬材料，且該焊料層112可為錫焊料。 Please refer to FIG. 3 and FIG. 4, which are schematic plan and partial cross-sectional views of a first solar cell according to a first embodiment of the present invention. The first solar cell 10a includes a first electrode layer 103 on the first surface 101, the single-sided metal tape 12 is directly attached (eg, adhered) to the first electrode layer 103, and the conductive adhesive layer 122 is directly attached. (Eg, adhered to) the first electrode layer 103. The first electrode layer 103 includes a bus electrode 1031 and a plurality of finger electrodes 1032 cross-connected to the bus electrode 1031. The single-sided metal tape 12 is directly attached (eg, adhered) to the bus electrode 1031. The conductive bonding tape 11 includes a metal core 111 and a solder layer 112 surrounding the metal core 111, and the solder layer 112 directly contacts a region of the bus electrode 1031. The metal core 111 may be a copper metal material, and the solder layer 112 may be a tin solder.
在該匯流電極1031與該導電焊帶11之間加入本發明之單面金屬膠帶12具有下列功能：第一、應用在太陽能電池片之導電金屬線以銅電鍍製程形成時，可防止該匯流電極1031上的銅與該導電焊帶11上的錫焊料在形成金屬共晶時，因反應過於劇烈而導致矽基板破裂的發生。因此，本發明之單面金屬膠帶12可作為該匯流電極1031與該導電焊帶11之間焊接時的緩衝，以提升該匯流電極1031與該導電焊帶11之間較大的附著力。第二、應用在導電金屬線為以網印銀漿再燒結而形成時，在該匯流電極1031與該導電焊帶11之間加入該單面金屬膠帶12，搭配使用具有較細銀線的匯流電極，不但可以維持該匯流電極1031與該導電焊帶11之間的拉力(亦即附著力)，同時可以減少銀漿的使用。 Adding the single-sided metal tape 12 of the present invention between the bus electrode 1031 and the conductive solder tape 11 has the following functions: First, the bus electrode can be prevented when the conductive metal wire applied to a solar cell is formed by a copper plating process. When the copper on 1031 and the tin solder on the conductive bonding tape 11 form a metal eutectic, the silicon substrate is cracked due to the reaction being too violent. Therefore, the single-sided metal tape 12 of the present invention can be used as a buffer during welding between the bus electrode 1031 and the conductive welding tape 11, so as to improve the larger adhesion between the bus electrode 1031 and the conductive welding tape 11. Second, when the conductive metal wire is formed by re-sintering the screen-printed silver paste, the single-sided metal tape 12 is added between the bus electrode 1031 and the conductive solder tape 11, and the bus with a thinner silver wire is used in combination. The electrode can not only maintain the tensile force (ie, adhesion) between the bus electrode 1031 and the conductive soldering tape 11, but also reduce the use of silver paste.
請參考圖5，其顯示本發明之另一實施例之第一太陽能電池之平面示意圖，其未顯示該導電焊帶11。該單面金屬膠帶12分成多段貼附於該匯流電極1031的不同區域。該單面金屬膠帶 12之各段長度與該匯流電極1031的相對比率則可視附著力、效率需求而做調整。 Please refer to FIG. 5, which shows a schematic plan view of a first solar cell according to another embodiment of the present invention, and the conductive solder tape 11 is not shown. The single-sided metal tape 12 is divided into a plurality of sections attached to different regions of the bus electrode 1031. The relative ratio of the length of each section of the single-sided metal tape 12 to the bus electrode 1031 can be adjusted according to the adhesion and efficiency requirements.
請參考圖6及圖2，該第二太陽能電池10b包括位於該第二表面102上之第二電極層104，該導電焊帶11直接接觸而附著(例如焊接)於該第二電極層104。本發明之單面金屬膠帶12可以只使用於附著力較差的一面，例如具有拋光表面之背面上的匯流電極。而具有粗糙化表面的正面上的匯流電極，在其附著力符合時，可以不採用本發明之單面金屬膠帶12以確保製程效率，進而避免增加成本。 Please refer to FIG. 6 and FIG. 2. The second solar cell 10 b includes a second electrode layer 104 on the second surface 102. The conductive bonding tape 11 is directly contacted and attached (eg, welded) to the second electrode layer 104. The single-sided metal tape 12 of the present invention can be used only on a side with poor adhesion, such as a bus electrode on a back surface having a polished surface. When the bus electrode on the front side with the roughened surface meets the adhesion, the single-sided metal tape 12 of the present invention may not be used to ensure the process efficiency, thereby avoiding an increase in cost.
前述說明是以具有粗糙化正面及拋光化背面的單面受光式太陽能電池為例，但本發明亦可用於雙面都是粗糙化或雙面都是拋光表面的太陽能電池結構，更進一步而言，這些結構的太陽能電池亦可能因為電極材料、製程或其他因素而使正面及背面兩個表面對導電焊帶的附著力不同，同樣可只使用單面金屬膠帶於附著力較差的一面，提高整個電池串的可靠度而避免增加太多成本，或者，利用本發明的焊接結構，業者可選擇原本因附著力不佳而無法用於量產的電極製程或導電漿料配方，可提高設計的彈性，以及進一步減少成本。 The foregoing description is an example of a single-sided light-receiving solar cell having a roughened front surface and a polished back surface, but the present invention can also be applied to a solar cell structure with both roughened sides or polished surfaces on both sides, and more specifically The solar cells of these structures may also have different adhesion to the conductive tape on the front and back surfaces due to electrode materials, manufacturing processes, or other factors. It is also possible to use only single-sided metal tape on the side with poor adhesion to improve the overall The reliability of the battery string avoids adding too much cost, or, with the welding structure of the present invention, the industry can choose an electrode process or a conductive paste formulation that could not be used for mass production due to poor adhesion, which can improve the flexibility of the design , And further reduce costs.
請參考圖7，其顯示本發明之第二實施例之太陽能電池串之剖面示意圖。該第二實施例之太陽能電池串1’大體上類似於該第一實施例之太陽能電池串1，類似的元件標示類似的標號，其主要差異為：該第二實施例之第一太陽能電池10a及第二太陽能電池10b為雙面受光的太陽能電池。該第一表面101為一粗糙化表面，該第二表面102為一粗糙化表面，且該第一表面101和該第二表面102分別朝向該太陽能電池串1’之不同面。該第一太陽能電池10a包括位於該第一表面101上之第一電極層103，該單面金屬膠帶12直接附著(例如黏接)於該第一電極層103之匯流電極。該第二太陽能電池10b包括位於該第二表面102上之第二電極層104，另一單面金屬膠帶12直接附著(例如黏接)於該第二 電極層104，而該導電膠層122直接附著(例如黏接)於該第二電極層104。該第二電極層104也包括一匯流電極(圖未示)及交叉相連於該匯流電極的多條指狀電極(圖未示)，該另一單面金屬膠帶12直接附著(例如黏接)於該第二電極層104之匯流電極。 Please refer to FIG. 7, which is a schematic cross-sectional view of a solar cell string according to a second embodiment of the present invention. The solar cell string 1 ′ of the second embodiment is substantially similar to the solar cell string 1 of the first embodiment, and similar elements are labeled with similar reference numerals. The main difference is that the first solar cell 10 a of the second embodiment is And the second solar cell 10b is a solar cell that receives light on both sides. The first surface 101 is a roughened surface, the second surface 102 is a roughened surface, and the first surface 101 and the second surface 102 respectively face different faces of the solar cell string 1 '. The first solar cell 10 a includes a first electrode layer 103 on the first surface 101, and the single-sided metal tape 12 is directly attached (eg, adhered) to the bus electrode of the first electrode layer 103. The second solar cell 10b includes a second electrode layer 104 on the second surface 102, and the other single-sided metal tape 12 is directly attached (eg, adhered) to the second electrode layer 104, and the conductive adhesive layer 122 is directly Adhere (eg, adhere) to the second electrode layer 104. The second electrode layer 104 also includes a bus electrode (not shown) and a plurality of finger electrodes (not shown) that are cross-connected to the bus electrode. The other single-sided metal tape 12 is directly attached (eg, bonded). A bus electrode on the second electrode layer 104.
該另一單面金屬膠帶12也包括一金屬箔121及附著於該金屬箔121之一導電膠層122，該另一單面金屬膠帶12位於該第二表面104和該導電焊帶11之間，該另一單面金屬膠帶12之導電膠層122位於該金屬箔121及該第二表面104之間，且該導電焊帶11直接附著(例如焊接)於該另一單面金屬膠帶12之金屬箔121。另外，第二實施例中的太陽能電池串亦可採取圖5之作法，即該另一單面金屬膠帶只覆蓋該第二電極層之匯流電極的部分區域，依附著力、成本考量，圖5的作法可以只用於太陽能電池和導電焊帶間附著力較強的一面以減少成本，或者，可以在太陽能電池的兩面都採用圖5的作法，但在附著力較弱的一面，單面金屬膠帶覆蓋匯流電極的面積比率較高。 The other single-sided metal tape 12 also includes a metal foil 121 and a conductive adhesive layer 122 attached to the metal foil 121. The other single-sided metal tape 12 is located between the second surface 104 and the conductive solder tape 11. The conductive adhesive layer 122 of the other single-sided metal tape 12 is located between the metal foil 121 and the second surface 104, and the conductive solder tape 11 is directly attached (eg, welded) to the other single-sided metal tape 12. Metal foil 121. In addition, the solar cell string in the second embodiment can also adopt the method of FIG. 5, that is, the other single-sided metal tape covers only a part of the bus electrode of the second electrode layer. According to adhesion and cost considerations, FIG. 5 The method can be used only on the side with strong adhesion between the solar cell and the conductive ribbon to reduce costs, or the method shown in Figure 5 can be used on both sides of the solar cell, but on the side with weak adhesion, single-sided metal tape The area ratio covering the bus electrodes is high.
前述第二實施例的焊接結構，亦可用於雙面都是拋光面太陽能電池結構以及亦可用於其中一面為粗糙面而另一面為拋光面的太陽能電池結構，可提高導電焊帶和太陽能電池表面間的附著力或提高設計的選擇彈性。 The welding structure of the foregoing second embodiment can also be used for both the solar cell structure with polished surfaces on both sides and the solar cell structure with one surface being rough and the other surface being polished, which can improve the conductive tape and the surface of the solar cell. Adhesion between them or increase design flexibility.
圖8顯示本發明之一實施例之太陽能電池串之製造方法之流程圖。該太陽能電池串之製造方法包括下列步驟： FIG. 8 shows a flowchart of a method for manufacturing a solar cell string according to an embodiment of the present invention. The method for manufacturing the solar cell string includes the following steps:
請參考圖9，在步驟100A中，將一第一太陽能電池10a及一第二太陽能電池10b相鄰配置。舉例，該些太陽能電池10a、10b包括：一光電轉換基板、一正面電極(亦即第二電極103)及一背面電極(亦即第一電極104)。該正面電極位於該光電轉換基板之一正面(亦即第二表面102)上，且該背面電極位於該光電轉換基板之一背面(亦即第一表面101)上。該光電轉換基板11是指可以光伏(photovoltaic)效應將光能轉換成電能的基板，亦即具有PN接面(P/N junction)或PIN接面(PIN junction)的矽基板，例如單晶 矽或多晶矽基板，該矽基板具有一射極層(圖未示)及一背電場層(圖未示)。該矽基板之主要本體部及該背電場層可為第一導電型，該射極層可為第二導電型並位於該矽基板內靠近該正面處，且該背電場層位於該矽基板內靠近該背面處。 Referring to FIG. 9, in step 100A, a first solar cell 10 a and a second solar cell 10 b are arranged adjacent to each other. For example, the solar cells 10a and 10b include a photoelectric conversion substrate, a front electrode (ie, the second electrode 103), and a back electrode (ie, the first electrode 104). The front electrode is located on a front surface of the photoelectric conversion substrate (that is, the second surface 102), and the back electrode is located on a back surface of the photoelectric conversion substrate (that is, the first surface 101). The photoelectric conversion substrate 11 refers to a substrate that can convert light energy into electric energy by a photovoltaic effect, that is, a silicon substrate having a PN junction (P / N junction) or a PIN junction (for example, single crystal silicon). Or a polycrystalline silicon substrate, the silicon substrate has an emitter layer (not shown) and a back electric field layer (not shown). The main body portion of the silicon substrate and the back electric field layer may be of a first conductivity type, the emitter layer may be of a second conductivity type and be located in the silicon substrate near the front surface, and the back electric field layer is located in the silicon substrate. Near the back.
請參考圖10及圖11，在步驟100B中，將一單面金屬膠帶12貼附於該第一太陽能電池10a之一第一表面101上，其中該單面金屬膠帶12包括一金屬箔121及附著於該金屬箔121之一導電膠層122，該導電膠層122於貼附後附著於該第一表面101。在本實施例中，該第一太陽能電池10a及第二太陽能電池10b可為單面受光的太陽能電池，該第一表面101為一拋光表面，該第二表面102為一粗糙化表面，且該第一表面102和該第二表面102分別朝向該太陽能電池串之不同面。該第一太陽能電池10a包括位於該第一表面101上之第一電極層103，在步驟100B中，以將該單面金屬膠帶12貼附於該第一電極層103，而該導電膠層122被附著於該第一電極層103。詳言之，該第一電極層103包括一匯流電極1031及交叉相連於該匯流電極1031的多條指狀電極1032，在步驟B中，將該單面金屬膠帶12貼附於該匯流電極1031。 Referring to FIG. 10 and FIG. 11, in step 100B, a single-sided metal tape 12 is attached to a first surface 101 of the first solar cell 10 a. The single-sided metal tape 12 includes a metal foil 121 and A conductive adhesive layer 122 attached to the metal foil 121 is attached to the first surface 101 after being attached. In this embodiment, the first solar cell 10a and the second solar cell 10b may be solar cells receiving light on one side, the first surface 101 is a polished surface, the second surface 102 is a roughened surface, and the The first surface 102 and the second surface 102 respectively face different faces of the solar cell string. The first solar cell 10a includes a first electrode layer 103 on the first surface 101. In step 100B, the single-sided metal tape 12 is attached to the first electrode layer 103, and the conductive adhesive layer 122 It is attached to the first electrode layer 103. In detail, the first electrode layer 103 includes a bus electrode 1031 and a plurality of finger electrodes 1032 cross-connected to the bus electrode 1031. In step B, the single-sided metal tape 12 is attached to the bus electrode 1031. .
在另一實施例中，在步驟100B中，該單面金屬膠帶12分成多段貼附於該匯流電極1031的不同區域，如圖5所示。 In another embodiment, in step 100B, the single-sided metal tape 12 is divided into a plurality of sections attached to different regions of the bus electrode 1031, as shown in FIG. 5.
在又一實施例中，在步驟100B中，該第一太陽能電池10a及第二太陽能電池10b可為雙面受光的太陽能電池，該第一表面101為一粗糙化表面，該第二表面102為一粗糙化表面，且該第一表面101和該第二表面102分別朝向該太陽能電池串1之不同面，如圖2所示。 In yet another embodiment, in step 100B, the first solar cell 10a and the second solar cell 10b may be solar cells receiving light on both sides. The first surface 101 is a roughened surface, and the second surface 102 is A roughened surface, and the first surface 101 and the second surface 102 respectively face different faces of the solar cell string 1, as shown in FIG. 2.
在其他實施例中，在步驟100B中，該第二太陽能電池10b包括位於該第二表面102上之第二電極層104，另一單面金屬膠帶12直接附著於該第二電極層104，而該導電膠層12直接附著於該第二電極層104。該第二電極層104也包括一匯流電極(圖未示)及交叉相連於該匯流電極的多條指狀電極(圖未示)，該另一 單面金屬膠帶12直接附著於該匯流電極，如圖7所示。 In other embodiments, in step 100B, the second solar cell 10b includes a second electrode layer 104 on the second surface 102, and the other single-sided metal tape 12 is directly attached to the second electrode layer 104, and The conductive adhesive layer 12 is directly attached to the second electrode layer 104. The second electrode layer 104 also includes a bus electrode (not shown) and a plurality of finger electrodes (not shown) cross-connected to the bus electrode. The other single-sided metal tape 12 is directly attached to the bus electrode. As shown in Figure 7.
在步驟100C中，以焊接方式將一導電焊帶11直接附著於該金屬箔121及附著於該第二太陽能電池10b之一第二表面102，如此以完成該些太陽能電池的電性串接，如圖2及圖3所示。在本實施例中，該第二太陽能電池10b包括位於該第二表面102上之第二電極層104，在步驟100C後，該導電焊帶11直接接觸該第二電極層104，且該導電焊帶11直接接觸該金屬箔121，如圖2所示。 In step 100C, a conductive welding tape 11 is directly attached to the metal foil 121 and a second surface 102 of the second solar cell 10b by welding, so as to complete the electrical series connection of the solar cells. As shown in Figure 2 and Figure 3. In this embodiment, the second solar cell 10b includes a second electrode layer 104 on the second surface 102. After step 100C, the conductive bonding tape 11 directly contacts the second electrode layer 104, and the conductive welding The band 11 directly contacts the metal foil 121 as shown in FIG. 2.
在其他實施例中，該另一單面金屬膠帶12也包括一金屬箔121及附著於該金屬箔121之一導電膠層122，該另一單面金屬膠帶12位於該第二表面102和該導電焊帶11之間，該另一單面金屬膠帶12之導電膠層122位於該金屬箔121及該第二表面102之間，且該導電焊帶11直接附著於該另一單面金屬膠帶12之金屬箔121，如圖7所示。 In other embodiments, the other single-sided metal tape 12 also includes a metal foil 121 and a conductive adhesive layer 122 attached to the metal foil 121. The other single-sided metal tape 12 is located on the second surface 102 and the Between the conductive welding tapes 11, the conductive adhesive layer 122 of the other single-sided metal tape 12 is located between the metal foil 121 and the second surface 102, and the conductive welding tape 11 is directly attached to the other single-sided metal tape. The metal foil 121 of 12 is shown in FIG. 7.
另外，將多個上述太陽能電池串之陣列平鋪於一背面板材/一封裝材與一正面玻璃板/一封裝材之間，並進行一層壓製程以形成一太陽能電池模組。在該層壓製程時，同時也會對該另一單面金屬膠帶12之導電膠層122再次施壓，如此會確保多個太陽能電池的電性串接。 In addition, an array of the above-mentioned solar cell strings is tiled between a back plate / a packaging material and a front glass plate / a packaging material, and a layer of pressing process is performed to form a solar cell module. During the pressing process of the layer, the conductive adhesive layer 122 of the other single-sided metal tape 12 will be pressed again at the same time, which will ensure the electrical series connection of multiple solar cells.
綜上所述，乃僅記載本發明為呈現解決問題所採用的技術手段之較佳實施方式或實施例而已，並非用來限定本發明專利實施之範圍。即凡與本發明專利申請範圍文義相符，或依本發明專利範圍所做的均等變化與修飾，皆為本發明專利範圍所涵蓋。 In summary, it is only a description of the preferred implementations or examples of the technical means adopted by the present invention to solve the problem, and is not intended to limit the scope of patent implementation of the present invention. That is, all changes and modifications that are consistent with the meaning of the scope of patent application of the present invention, or made according to the scope of patent of the present invention, are covered by the scope of patent of the present invention.
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