CN116705885A - Preparation method of photovoltaic module and photovoltaic module - Google Patents
Preparation method of photovoltaic module and photovoltaic module Download PDFInfo
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- CN116705885A CN116705885A CN202310694662.2A CN202310694662A CN116705885A CN 116705885 A CN116705885 A CN 116705885A CN 202310694662 A CN202310694662 A CN 202310694662A CN 116705885 A CN116705885 A CN 116705885A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 134
- 238000000034 method Methods 0.000 claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 claims abstract description 47
- 230000008569 process Effects 0.000 claims description 35
- 238000003475 lamination Methods 0.000 claims description 27
- 229910000679 solder Inorganic materials 0.000 claims description 19
- 239000010410 layer Substances 0.000 description 27
- 238000004806 packaging method and process Methods 0.000 description 21
- 239000002313 adhesive film Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 238000005336 cracking Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 238000010030 laminating Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 5
- 229920006280 packaging film Polymers 0.000 description 4
- 239000012785 packaging film Substances 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
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- 125000006850 spacer group Chemical group 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
- H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Sustainable Energy (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a preparation method of a photovoltaic module and the photovoltaic module. The method comprises the following steps: a first bus bar is paved on a first welding strip extension section of a first battery string with back contact battery pieces connected in series; the first welding strip extension section is welded to the first bus bar; paving an insulating cushion layer; turning the first bus bar in the direction of the first battery string, and turning the first bus bar to the end back contact battery piece, so that the insulating cushion layer is positioned between the second main surface of the first bus bar and the back surface of the end back contact battery piece; a new first battery string formed by serially connecting back contact battery pieces is paved in the extending direction of the first battery string, and a second welding strip extension section of the first end of the new first battery string is controlled to be positioned on the first main surface of the first bus bar; the second strap extension is welded to the first bus bar to connect the first battery string in parallel with the new first battery string. According to the scheme, the connection difficulty of the battery string and the bus bar in the photovoltaic module can be reduced while the bus bar is hidden, and the mass production yield of the photovoltaic module is improved.
Description
Technical Field
The invention relates to a preparation method of a photovoltaic module and the photovoltaic module.
Background
For the photovoltaic module prepared by adopting the back contact solar cell (hereinafter referred to as back contact cell), the first bus bar is positioned between the back contact cell or at one side of the back contact cell, so that the appearance aesthetic property of the photovoltaic module is affected, and the area and the size of the photovoltaic module are affected.
At present, in order to avoid the influence of a first bus bar at the middle position of a photovoltaic module on the appearance, the area and the size of the photovoltaic module, the first bus bar is vertically placed between two battery strings in the preparation process of the photovoltaic module, two side surfaces of the first bus bar face the two battery strings respectively, then welding strips of the two battery strings are connected to the two side surfaces of the first bus bar respectively, and the first bus bar is folded to the back surface of one battery string. However, the conventional manner in which the solder strips of the two battery strings are respectively connected to both side surfaces of the first bus bar has the following drawbacks:
in the first aspect, since the two battery strings are placed first and then the first bus bar is placed upright, the placing operation of the two battery strings and the first bus bar is required to be high.
In the second aspect, because of the difficulty and complexity of the operation of bending, aligning and connecting the plurality of solder strips of the battery string to the side surfaces of the first bus bar, the accuracy requirements of the production equipment of the photovoltaic module are also relatively high, which is difficult to achieve by the existing production equipment of the photovoltaic module.
In the third aspect, after the plurality of welding strips of two battery strings are connected to the bus bar, in the process of turning over the first bus bar, a pulling force is inevitably applied to the welding strips connected to the outer side face of the turning over direction, the welding strip pulling process is inevitably influenced, the connection between the welding strips and the back contact battery piece is inevitably influenced, the back contact battery piece connected to the welding strips is damaged, and the mass production yield of the photovoltaic module is low.
In the fourth aspect, since the welding strips of the two battery strings are distributed on the two side surfaces of the first bus bar, and the thickness of the bus bar and the welding strips on the two sides are overlapped, the thickness of the photovoltaic module is increased, and the pressure ratio born by the back contact battery piece in the lamination process is larger due to the increase of the thickness, so that the risk of hidden cracking of the edge back contact battery piece of the battery string is higher.
Disclosure of Invention
In view of the above, the invention provides a preparation method of a photovoltaic module and the photovoltaic module, which can effectively simplify the procedures of bus bar laying, battery string and bus bar connection and the like while hiding bus bars and reducing the interval between parallel battery strings in the photovoltaic module, and enable the welding strip extension sections of two parallel battery strings to be welded on the same side of the bus bars, thereby reducing the risk of hidden cracking of battery pieces and effectively improving the mass production yield of the photovoltaic module.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a method for manufacturing a photovoltaic module, comprising:
a1, paving a first bus bar on a first welding strip extension section of a first end of a paved first battery string, wherein the first battery string is formed by serially connecting back contact battery pieces, and the first welding strip extension section is contacted with a first main surface of the first bus bar;
step b1, welding the first welding strip extension section to the first bus bar;
step c1, paving an insulating cushion layer;
d1, turning over the first bus bar in the direction of the first battery string, controlling the first bus bar to be turned over to the position above the end back contact battery piece connected with the first welding strip extension section, enabling the second main surface of the first bus bar to be opposite to the back surface of the end back contact battery piece, enabling the insulating cushion layer to be located between the second main surface of the first bus bar and the back surface of the end back contact battery piece, and enabling the first main surface of the first bus bar and the second main surface to be opposite to each other;
step e1, paving a new first battery string formed by serially connecting back contact battery pieces in the extending direction of the first battery string, and controlling a second welding strip extending section of a first end of the new first battery string to be positioned on the first main surface of the first bus bar;
And f1, welding the second welding strip extension section and the first bus bar so as to enable the first battery string to be connected with the new first battery string in parallel.
In a second aspect, an embodiment of the present invention provides a photovoltaic module, including: the back contact battery pieces are connected in series to form a first battery string, the back contact battery pieces are connected in series to form a new first battery string, a first bus bar and an insulating cushion layer, wherein,
a first strap extension opposite a first end of the first string is welded to a first major surface of the first bus bar, and the first bus bar is folded over to the back surface of the end back contact battery piece of the first end of the first string, a second major surface of the first bus bar opposite the first major surface being opposite the back surface of the end back contact battery piece;
the insulating cushion layer is positioned between the second main surface of the first bus bar and the end back contact battery piece;
the second ribbon extension of the first end of the new first string is welded to the first major surface of the first bus bar.
The technical scheme of the first aspect of the invention has the following advantages or beneficial effects:
1. according to the scheme provided by the embodiment of the invention, the first bus bar connected with the first welding strip extension section of the first battery string is turned over to the back surface of the back contact battery piece at the end part connected with the first welding strip extension section, so that the bus bar is hidden at the back surface of the back contact battery piece, the blocking of the bus bar is avoided, and the distance between two parallel battery strings can be further reduced.
2. According to the scheme provided by the embodiment of the application, the first bus bar is directly paved on the first welding strip extension section of the first end of the first battery string formed by serially connecting the back contact battery pieces, the second welding strip extension section of the new first battery string formed by serially connecting the back contact battery pieces is directly paved on the first bus bar, and compared with the existing bending welding strip extension section and welding the bending welding strip extension section to the side surface of the vertically placed bus bar, the scheme provided by the application does not need to match the bus bar by bending the welding strip extension section and does not need to vertically place the bus bar, so that the working procedures of bus bar paving, battery string and bus bar connection and the like are effectively simplified, the difficulty of a photovoltaic module preparation process is greatly reduced, and the industrialized equipment of the existing photovoltaic module can be directly adopted, so that the quantitative production of the photovoltaic module is realized.
3. The first bus bar is paved on the first welding strip extension section of the first end of the first battery string, the first welding strip extension section is enabled to be in contact with the first main surface of the first bus bar, the first welding strip extension section is welded to the first bus bar, in the process of overturning the first bus bar, the first welding strip extension section overturns along with the first bus bar, the first main surface of the first bus bar is overturned upwards, in the process of paving a new first battery string, the second welding strip extension section of the first end of the new first battery string can be directly paved on the first main surface of the first bus bar, so that the welding strip extension sections of the two battery strings are located on the same side of the bus bar and are main surfaces, the welding strip extension sections are enabled to be firmly welded with the bus bar, and meanwhile, compared with the fact that the welding strips of the two battery strings are distributed on the two sides of the bus bar to increase the thickness of the bus bar area, the pressure of an end battery piece connected with the bus bar in the laminating process is increased, the pressure of the battery piece is not increased, the pressure of the battery piece is effectively reduced, the risk of the photovoltaic assembly is effectively reduced, and the yield of the photovoltaic assembly is effectively increased.
4. According to the photovoltaic module, the first welding strip extending section connected with the first bus bar is driven to turn towards the first battery string through turning of the first bus bar, so that the first welding strip extending section is prevented from being bent in advance to damage the connection between the first welding strip extending section and the battery piece at the end part, in addition, the second welding strip extending section of a new battery string is placed on the first main surface of the first bus bar after the first bus bar is turned, the battery string is prevented from being pulled through turning of the first bus bar, the risk of hidden cracking of the battery piece is further reduced, and the mass production yield of the photovoltaic module is further improved.
Drawings
Fig. 1 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present application;
fig. 2A is a schematic diagram of a partial structure change process corresponding to a method for manufacturing a photovoltaic module according to an embodiment of the present application;
fig. 2B is a schematic diagram of a partial structure change process corresponding to a method for manufacturing a photovoltaic module according to an embodiment of the present application;
fig. 2C is a schematic diagram of a partial structure change process corresponding to a method for manufacturing a photovoltaic module according to an embodiment of the present application;
fig. 3 is a schematic diagram of a partial structure change process corresponding to a method for manufacturing a photovoltaic module according to an embodiment of the present application;
Fig. 4 is a schematic view of a part of the relative positional relationship between parallel battery strings according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a relative positional relationship between battery strings in a photovoltaic module according to an embodiment of the present invention;
fig. 6 is a schematic view of a part of the structure of a photovoltaic module according to an embodiment of the present invention;
fig. 7 is a schematic view of a part of the structure of a photovoltaic module according to an embodiment of the present invention;
fig. 8 is a schematic cross-sectional structure of a photovoltaic module corresponding to an intermediate bus bar according to an embodiment of the present invention;
fig. 9 is a schematic structural view of a bus bar outlet according to an embodiment of the present invention;
fig. 10 is a schematic structural view of another bus bar outlet according to an embodiment of the present invention.
The reference numerals are as follows:
10-a first battery string; 10' -a new first battery string; 11-back contact battery pieces; 11' -end back contact battery plate; 12-a first solder strip extension; 12' -a second solder strip extension; 20-a first bus bar; 21-a first major surface of a first bus bar; 22-a second major surface of the first bus bar; 30-insulating cushion layer; 40-a second bus bar; 50-cover plate; 60-front packaging adhesive film; 60' -post-packaging adhesive film; 70-a back plate; 80-a first bussing line; 80' -second bus line; 80 "-third bus bar.
Detailed Description
The step of laying another structure on one structure in the process of manufacturing the photovoltaic module according to the embodiment of the present invention generally refers to that the other structure is at least partially disposed above the one structure in the process of manufacturing the photovoltaic module, and the other structure can be directly or indirectly connected to the one structure through a subsequent manufacturing process, which does not limit a relative positional relationship between the other structure and the one structure in the process of using the photovoltaic module. For example, laying the first bus bar on the first ribbon extension section generally means that, in the process of manufacturing the photovoltaic module, the first bus bar is placed above the first ribbon extension section, and the first bus bar is at least partially welded to the first ribbon extension section through a subsequent manufacturing process.
The fact that one structure is located above another structure in the process of manufacturing a photovoltaic module according to the embodiment of the present invention generally means that the one structure is at least partially located above a partial area of the other structure facing upwards in the process of manufacturing a photovoltaic module, which does not limit the relative positional relationship between the one structure and the other structure in the process of using the photovoltaic module. For example, the first bus bar being turned over to the top of the end back contact cell to which the first strap extension is connected generally means that, although the first strap extension is connected to the back light surface of the end back contact cell, the back light surface of the end back contact cell faces upward during the preparation of the photovoltaic module, the first bus bar is turned over to the top of the back light surface of the end back contact cell, and the first bus bar is located under the back light surface of the end back contact cell during the use of the photovoltaic module.
The main surface of a structure according to an embodiment of the present invention generally refers to a surface of the structure having a relatively large surface area, for example, the first main surface or the second main surface of the first bus bar refers to two main surfaces of the first bus bar having a relatively large surface area (i.e., surfaces including the long side and the wide side of the first bus bar).
The extending direction of the battery string according to the embodiment of the present invention generally refers to a direction perpendicular to the longitudinal direction of the battery piece or a connection direction of the battery piece.
The "first", "second", "third", and the like in the embodiments of the present invention are for distinguishing between different structures or components or between different positions of the same structure, and are not intended to limit the number, order, or the like of structures or components. For example, the first bus bar according to the embodiment of the present invention is typically a bus bar located in the middle of the photovoltaic module, and the second bus bar is typically a bus bar located at the edge of the photovoltaic module. For another example, the battery string includes two ends, one of the two ends connected to the bus bar in the middle is a first end, and the other end is a second end. For another example, the first major surface of the first bus bar is a major surface in solder contact with the first ribbon extension, and the second major surface is another major surface disposed opposite the first major surface.
The front side of a structure or component to which embodiments of the present invention relate generally refers to the major surface of the structure or component that faces the sun during use of the photovoltaic module as part of the photovoltaic module. Accordingly, the back side of a structure or component is generally intended to mean that the structure or component is part of a photovoltaic module that, in use of the photovoltaic module, faces away from the main surface of the sun.
In order to solve the problems that in the existing photovoltaic module preparation process, in order to hide bus bars, the operation difficulty and the complexity of a mode of vertically placing the bus bars are high, production equipment needs to be modified, and the yield is reduced. The embodiment of the invention provides a preparation method of a photovoltaic module and the photovoltaic module. Fig. 1 is a schematic flow diagram of a preparation method of a photovoltaic module according to an embodiment of the present invention; FIGS. 2A, 2B and 2C schematically illustrate structural plane changes corresponding to steps in a method of manufacturing a photovoltaic module; fig. 3 exemplarily shows a schematic diagram of structural cross-section changes corresponding to steps in a method of manufacturing a photovoltaic module. As shown in fig. 1, the method for preparing the photovoltaic module may include the following steps:
Step S101: laying a first bus bar 20 on a first solder strip extension 12 of a first end of the laid first battery string 10, wherein the first battery string 10 is formed by serially connecting back contact battery pieces 11, the first solder strip extension 12 being in contact with a first main surface 21 of the first bus bar 20;
step S102: welding the first ribbon extension 12 to the first bus bar 20;
the structure of steps S101 to S102 shown in fig. 2A and 2B is changed. It should be noted that, the welding method used in the welding process in the step S102 may be one of a laser method, an infrared heating method, or a mechanical hot pressing method, and specifically, which method is selected may be determined based on the welding equipment of the existing photovoltaic module production process. In addition, since the first bus bar 20 is directly placed on the first solder strip extension 12 in step S101, the bus bar is generally controlled by the existing device in the production process of the photovoltaic module. Therefore, step S101 and step S102 can be realized without modifying the existing photovoltaic module production equipment.
Step S103: laying an insulating cushion layer 30;
the laying of the insulating mat layer 30 can be achieved by an apparatus for laying an insulating layer in an existing photovoltaic module production process.
This step S103 may be as shown in fig. 2A or fig. 2B corresponding to the structural change. Wherein a partial cross-sectional schematic view of a structure corresponding to fig. 2A may be shown in fig. 3.
Step S104: turning the first bus bar 20 in the direction of the first battery string 10, controlling the first bus bar 20 to be turned over the end back contact battery piece 11' connected with the first welding strip extension section 12, enabling the second main surface 22 of the first bus bar 20 to be opposite to the back surface of the end back contact battery piece 11', enabling the insulating cushion 30 to be located between the second main surface 22 of the first bus bar 20 and the back surface of the end back contact battery piece 11', and enabling the first main surface 21 and the second main surface 22 of the first bus bar 20 to be opposite to each other;
this step S104 corresponds to the structural change as shown in fig. 2A, 2B and 3. Wherein fig. 3 is a schematic partial cross-sectional view of a structure corresponding to fig. 2A.
The implementation of this step can enable the first bus bar 20 to be turned by adjusting the operation logic of the device for controlling the bus bar in the existing photovoltaic module production process, in addition, a clamping mechanism capable of achieving turning and the like can be simply installed on the first bus bar 20 to control the first bus bar 20 to turn, and as the first bus bar 20 and the first welding strip extension section 12 are welded, only the first bus bar 20 needs to be controlled to enable the part of the first welding strip extension section 12 to follow the turning, so that the operation is convenient.
Step S105: in the extending direction of the first cell string 10, a new first cell string 10' formed by serially connecting back contact cell sheets 11 is laid, and a second solder strip extension section 12' controlling the first end of the new first cell string 10' is located on the first main surface 22 of the first bus bar 20;
the new first cell string 10 'is identical in structure and number to the first cell string 10 and includes the cell sheets, but the new first cell string 10' and the first cell string 10 are connected in parallel by a bus bar, i.e., a first bus bar 20, located in the middle of the photovoltaic module.
Step S106: the second ribbon extension 12 'is welded to the first bus bar 20 so that the first battery string 10 is connected in parallel with the new first battery string 10'.
The solder strip extension generally refers to the portion of the solder strip extending from the end cell for connecting the end cell of the bus bar (bus bar in the middle of the photovoltaic module or bus bar at the edge of the photovoltaic module), as indicated by the first solder strip extension 12 in fig. 3.
The second solder strip extension section 12 'and the first solder strip extension section 12 are not overlapped with each other, so that the thickness of the photovoltaic module is prevented from being increased due to the thickness superposition of the second solder strip extension section 12' and the first solder strip extension section 12 while the welding quality is ensured.
The step S105 and the step S106 correspond to the structural change as shown in fig. 2A, 2B, and 3.
In order to firmly connect the battery string to the bus bar, in the above step S101, the overlapping width D (which may be shown in fig. 4) between the first strap extension 12 and the first bus bar 20 laid thereon is not less than one-half of the width of the first bus bar 20 and not more than the width of the first bus bar 20.
In addition, in the above-described step S105, the overlapping width between the second land extension 12' and the first bus bar 20 is not less than one-half of the width of the first bus bar 20 and not more than the width of the first bus bar 20.
In order to enable the insulating mat 30 to be located between the end back contact battery piece and the inverted first bus bar 20, the above-described step S103 may be implemented in two ways.
Specifically, the first implementation manner of the step S103 is as follows: an insulating mat 30 is laid on the edge region of the end back contact battery piece 11'. Resulting in the structure shown in fig. 2A and 3. It will be appreciated that for the first implementation, there is no strict order of sequence between the step S103 and the step S102.
The second implementation manner of the step S103 is as follows: an insulating mat 30 is adhered to the second main surface 22 of the first bus bar 20. Resulting in the structure shown in fig. 2B.
Wherein the width of the insulating mat layer 30 is generally greater than the width of the bus bar with which it is in contact.
Wherein the length of the insulating mat layer 30 is greater than the length of the bus bar with which it is in contact.
By controlling the width and length of the insulating mat 30 to exceed the bus bars with which it is in contact, electrical isolation between the bus bars, such as the above-described first bus bar 20 and the below-described second bus bar 40, and the battery cells with which it is in contact is ensured, and occurrence of short circuits is avoided, so that reliability of the photovoltaic module is ensured.
Wherein the insulating mat 30 is a single layer or a laminated film made of one or more of the following materials: PET, EVA, EVE and POE. By selecting the materials, after the photovoltaic module is laminated, the insulating cushion layer 30 and the packaging layer are integrated, so that the situation that the photovoltaic module is layered, shaded and the like due to existence of the insulating cushion layer 30 is avoided while electric isolation is ensured.
The embodiment of turning the first bus bar 20 in the direction in which the first battery string 10 is located in the step S104 may include: the first bus bar 20 is turned 180 ° in the direction in which the first battery string 10 is located. As shown in fig. 3, the primary bus bar 20 is controlled to turn 180 ° and is superimposed on the end cell.
Further, the pitch L (which is shown in fig. 4) between the first land extension 12 and the second land extension 12' on the first main surface 22 of the primary bus bar 20 is controlled to be 1mm to 2mm. So that the dislocation between the two strings can be reduced while avoiding overlapping of the first and second ribbon extensions 12, 12' to maintain the consistency and aesthetics of the photovoltaic module.
Further, in order to ensure the connection stability between the first ribbon extension 12 and the first bus bar 20 and meet the flipping requirement, the length of the first ribbon extension 12 is generally 5mm to 20mm. The length of the first solder strip extension 12 can be controlled to be any value between 5mm and 20mm.
In addition, the length of the second ribbon extension 12' is 5mm to 20mm. To ensure the connection stability between the second strap extension 12' and the first bus bar 20.
Further, for a photovoltaic module including a plurality of cell strings and a plurality of second bus bars 40 disposed at ends, the above preparation method may further include: paving and welding a second bus bar 40 on a third welding strip extension section of a second end of each battery string, and paving an insulating cushion layer 30 between the second bus bar 40 and the battery string connected with the second bus bar so that each second bus bar 40 is electrically connected with one battery string or two adjacent battery strings, wherein the second end is positioned at the edge of the photovoltaic module;
the second bus bar 40 is positioned at the rear surface of the battery string to which it is connected by folding.
Wherein the plurality of battery strings includes the aforementioned first battery string 10 and a new first battery string 10'.
The second bus bar 40 is a bus bar located at the edge of the photovoltaic module.
Specifically, the structure of the photovoltaic module including the above-described plurality of cell strings and the plurality of second bus bars 40 provided at the end portions may be as shown in fig. 5. As can be appreciated, based on the circuit design of the photovoltaic module, on the basis of the preparation method related to fig. 1, for the case that one middle bus bar in the photovoltaic module is connected with four battery strings, two battery strings located on the same side of the middle bus bar are generally laid first, then the middle bus bar is laid on the welding strip extension section of the laid two battery strings corresponding to the middle area of the photovoltaic module, an insulating cushion layer is laid on the middle bus bar or the back edge area of the two battery strings, the middle bus bar is folded to the back of the two battery strings, wherein the insulating cushion layer is located between the back of the battery strings and the middle bus bar, then two other battery strings are laid, the welding strip extension sections of the two other battery strings are directly lapped on the middle bus bar, and the obtained relationship diagram between partial battery strings in the photovoltaic module can be shown in fig. 6. In addition, based on the circuit design of the photovoltaic module, aiming at the condition that two adjacent battery strings are connected with the same edge bus bar, the two battery strings are paved firstly, then the edge bus bar is paved on the welding strip extension section corresponding to the edge of the two battery strings, and the welding is carried out; after the insulating mat layer is laid on the edge bus bar or the edge area of the back surface of the two battery strings corresponding to the edge bus bar, the edge bus bar is turned over to the back surfaces of the two battery strings, wherein the insulating mat layer is located between the edge bus bar and the back surfaces of the two battery strings, and a schematic diagram of the relationship between part of the battery strings in the obtained photovoltaic module can be shown in fig. 7.
Through the process, the edge bus bar of the photovoltaic module is also hidden at the back of the battery string, so that the size of the photovoltaic module is further reduced, and the front of the photovoltaic module is attractive.
Further, the steps S101 to S106 shown in fig. 1 described above may be completed in the series welding stage to more precisely control the spacing between the battery strings. In addition, steps S101 to S106 may be completed in the lamination stage. The arrangement of the battery strings, the parallel connection and the serial connection among the battery strings are completed on the laid front packaging layer.
Further, for each of the above embodiments, the method of manufacturing a photovoltaic module may further include a lamination stage of manufacturing the photovoltaic module, wherein,
the lamination stage of photovoltaic module fabrication may include: paving a cover plate 50, and paving a front packaging adhesive film 60 on the cover plate; a plurality of first battery strings 10, a plurality of new first battery strings 10' and a plurality of second battery strings 50 are laid and connected on the front packaging adhesive film 60 according to a preset serial-parallel structure; the rear packaging film 60 'is layered, and the back plate 70 is layered on the rear packaging film 60'. The relative positional relationship among the structures of the cover plate 50, the front packaging adhesive film 60, the first cell string 10, the second cell string 50, the rear packaging adhesive film 60', the back plate 70 and the like in the photovoltaic module may be shown in a schematic cross-sectional structure of the photovoltaic module passing through the middle bus bar shown in fig. 8 and a schematic connection relationship among the cell strings in the photovoltaic module shown in fig. 5.
Further, there are a variety of ways to handle the buss-out wires for the lamination stage of photovoltaic module fabrication.
Specifically, for the lamination stage of photovoltaic module fabrication, a first way of handling the bussing line may include: the first bus lead wires 80 respectively belonging to the two bus bars are adjusted to pass through the corresponding lead holes on the rear packaging adhesive film 60' and the backboard 70, the first bus lead wires 80 are leveled and laminated, wherein the leveled two first bus lead wires 80 respectively form a linear structure with the bus bars connected with the same, and the leveled two first bus lead wires 80 are intersected and do not overlap. Specifically, the relative positional relationship of the two first bus bar wires 80 that are flattened is shown in fig. 8. It can be seen from fig. 8 that the two first bus-bar outgoing lines 80 are not overlapped with each other, so that the flattened first bus-bar outgoing lines 80 can be attached to the back plate, and the situation that the two first bus-bar outgoing lines 80 are overlapped to cause one first bus-bar outgoing line 80 to tilt to generate excessive pressure on the connected battery piece is avoided, so that the risk of hidden cracking of the battery piece in the lamination process is reduced.
Wherein the width of the first bus bar 80 is not more than one half of the bus bar width. To prevent the two first bus bar wires 80 from overlapping each other.
Specifically, for the lamination stage of photovoltaic module fabrication, a second way of handling the bussing line may include: filling the bus bar region corresponding to the extraction holes on the rear packaging adhesive film 60' and the rear plate 70 with a removable member such as an adhesive tape, a solid filler matched with the extraction holes, or the like, and removing the removable member after lamination; the second bus bar 80' is welded to the bus bar region corresponding to the lead hole through the lead hole 60. The bus bar region of the lead-out hole may be maintained by the filled removable member during the lamination process so that the second bus bar 80' is welded to the bus bar region after the lamination process, avoiding the pressure of the second bus bar 80' against the battery cell during the lamination process, and after the welding, the second bus bar 80' is obtained as shown in fig. 9.
Specifically, for the lamination stage of photovoltaic module fabrication, a third way of handling the bussing line may include: for the bus bar connected with the third bus-bar outgoing line 80', the connection area of the third bus-bar outgoing line 80' and the bus bar is folded back, and the folded-back connection area is flattened and shaped; the folded-back configuration of the flattened shaped connection area remains unchanged during the third buss-out line 80 "passes through the exit hole and lamination stage. The flattened and shaped third bus bar 80″ may be as shown in fig. 10. The connection region between the folded third bus-bar outgoing line 80 'and the bus bar is prevented from generating excessive pressure on the battery piece through flattening and shaping, and meanwhile, the tensile force action of the folded third bus-bar outgoing line 80' on the connection region can be reduced in the lamination process, so that the risk of hidden cracking of the battery piece in the lamination process is reduced.
The width of flattening and shaping is 1-4 mm, so that the flattening and shaping area is hardly influenced by the third bus-wire 80", and the acting force of the connection area of the third bus-wire 80" and the bus bar on the battery piece in the lamination process is avoided.
Wherein, the various bus bars can be made of one of silver, copper or tin-coated copper.
According to the scheme provided by the embodiments, the first bus bar connected with the first welding strip extension section of the first battery string is turned over to the back surface of the back contact battery piece at the end connected with the first welding strip extension section, so that the bus bar is hidden on the back surface of the back contact battery piece, the blocking of the bus bar is avoided, and the distance between two parallel battery strings can be further reduced.
Further, as the scheme provided by each embodiment is that the first bus bar is directly paved on the first welding strip extension section of the first end of the first battery string formed by serially connecting the back contact battery pieces, and the second welding strip extension section of the new first battery string formed by serially connecting the back contact battery pieces which is paved later is also directly paved on the first bus bar, compared with the existing bending welding strip extension section and welding the bending welding strip extension section to the side surface of the vertically arranged bus bar, the scheme provided by the application does not need to bend the welding strip extension section to match the bus bar and also does not need to vertically arrange the bus bar, thereby effectively simplifying the procedures of bus bar paving, battery string and bus bar connection and the like, greatly reducing the difficulty of the preparation process of the photovoltaic module, and being capable of directly adopting the industrialized equipment of the existing photovoltaic module to realize the quantitative production of the photovoltaic module.
In addition, through laying the first bus bar on the first welding strip extension section of the first end of the first battery string, the first welding strip extension section is enabled to be in contact with the first main surface of the first bus bar, the first welding strip extension section is welded to the first bus bar, in the process of overturning the first bus bar, the first welding strip extension section overturns along with the first bus bar, the first main surface of the first bus bar is enabled to be overturned upwards, in the process of laying a new first battery string, the second welding strip extension section of the first end of the new first battery string can be directly laid on the first main surface of the first bus bar, so that the welding strip extension sections of the two battery strings are located on the same side of the bus bar and are main surfaces, the welding strip extension sections and the bus bar are firmly welded, and simultaneously, the thickness of the bus bar area is increased compared with the welding strip distribution of the two existing battery strings on the two sides of the bus bar, the pressure of the end battery piece connected with the bus bar and the battery piece hidden risk in the laminating process are increased, the pressure of the battery piece is not increased, the hidden crack of the battery piece provided by the scheme is effectively reduced, the photovoltaic assembly is effectively improved, the yield of the hidden crack assembly is improved, and the hidden crack rate of the battery piece is effectively improved.
In addition, each embodiment drives the first welding strip extending section connected with the first bus bar to turn towards the first battery string through the first bus bar turning, so that the first welding strip extending section is prevented from being bent in advance to damage the connection of the first welding strip extending section and the battery piece at the end part, in addition, the second welding strip extending section of the new battery string is placed on the first main surface of the first bus bar after the first bus bar turning, the battery string is prevented from being pulled by the first bus bar turning, the hidden cracking risk of the battery piece is further reduced, and the mass production yield of the photovoltaic module is further improved.
Further, fig. 5 to 8 show a schematic view of a part of a structure of a photovoltaic module according to an embodiment of the present invention. As shown in fig. 5 to 8, the photovoltaic module may include: the first cell string 10 is formed by the back contact cell pieces 11 connected in series, the new first cell string 10' is formed by the back contact cell pieces 11 connected in series, the first bus bar 20 and the insulating mat 30, wherein,
the first ribbon extension 12 opposite the first end of the first cell string 10 is welded to the first main surface 21 of the first bus bar 20, and the first bus bar 20 is folded over to the back surface of the end back contact cell 11 'of the first end of the first cell string 10, and the second main surface 22 of the first bus bar 20 opposite the first main surface 21 is opposite the back surface of the end back contact cell 11';
the insulating spacer 30 is located between the second main surface 22 of the first bus bar 20 and the end back contact battery piece 11';
the second ribbon extension 12 'of the first end of the new first cell string 10' is welded to the first major surface 21 of the first bus bar 20.
Through above-mentioned photovoltaic module not only can hide the busbar, the welding strip extension section that is connected with the busbar is located the same main surface of busbar moreover, avoids photovoltaic module thickness to increase, avoids distributing the pressure that the welding strip extension section that leads to the fact the battery piece in busbar both sides simultaneously, reduces the hidden risk of splitting of battery piece.
Further, as shown in fig. 5, the above photovoltaic module further includes: a plurality of battery strings arranged, wherein,
the first battery string 10 and the new first battery string 10' belong to two of the plurality of battery strings;
the bus bars for connecting two battery strings in series are arranged on the back surfaces of the battery strings connected in series in a turnover manner, and an insulating cushion layer 30 is arranged between the bus bars and the back surfaces of the battery strings corresponding to the bus bars.
In addition, the photovoltaic module provided by the embodiment of the invention can have various leading-out bus bar structures.
Specifically, as shown in fig. 8, for the first structure of the outgoing bus bar, the above-mentioned photovoltaic module further includes: two first lead-out bus bars for connection with an external junction box, each of which includes a first bus-out wire 80, and a lead-out hole; the two first bus-bar outgoing lines 80 pass through the outgoing holes, and the projections of the two first bus-bar outgoing lines 80 on any one of the first bus-bar outgoing lines are not overlapped with each other.
Wherein the width of the first bus bar 80 is not more than one half of the width of the first bus bar.
Specifically, as shown in fig. 9, for the second structure of the extraction bus bar, a second bus bar outgoing line 80' is welded to the bus bar region corresponding to the extraction hole through the extraction hole.
Specifically, as shown in fig. 10, for the third structure of the extraction bus bar, the photovoltaic module further includes: two second lead-out bus bars for connection with an external junction box, wherein adjacent ends of each second lead-out bus bar are respectively connected with a third bus lead-out wire 80'; the connection area of each second bus bar and the third bus bar 80″ to which it is connected is a flattened, folded structure.
Through the bus-bar outgoing lines with the three structures, the hidden cracking risk of the battery piece in the photovoltaic module in the lamination process can be effectively reduced.
In addition, the embodiment of the invention also provides a power station, which can comprise: the photovoltaic module provided by the embodiment.
The steps that can be included in the above preparation method are described in detail in the following two specific examples.
Example 1:
the following steps A1 to a12 are cyclically performed in the series welding stage to obtain a plurality of battery strings of 'series-parallel connection', and the obtained plurality of battery strings of series-parallel connection are conveyed to the lamination stage:
step A1, in a series welding stage, paving an intermediate bus bar on a welding strip extension section of a first end of a battery string formed by serially connecting back-contact battery pieces, wherein the connecting end part of the welding strip extension section is in back contact with a first electrode main grid line of the battery pieces, and the welding strip extension section is in contact with a first main surface of the bus bar paved by the welding strip extension section;
Step A2, welding the welding strip extension section to the middle bus bar paved in the step A1;
step A3, paving an insulating cushion layer on the end back contact battery piece connected with the welding strip extension section;
step A4, turning over the middle bus bar in the direction of the battery string, controlling the middle bus bar to be turned over to the position above the end back contact battery piece connected with the welding strip extension section, enabling the second main surface of the middle bus bar to be opposite to the back surface of the end back contact battery piece, enabling the insulating cushion layer to be positioned between the second main surface of the middle bus bar and the back surface of the end back contact battery piece, and enabling the first main surface of the middle bus bar to be opposite to the second main surface;
step A5, paving another battery string formed by serially connecting back contact battery pieces in the extending direction of the battery string, and controlling a welding strip extending section at the first end of the other battery string to be positioned on the first main surface of the middle bus bar;
step A6, welding the welding strip extension section paved in the step A5 and the middle bus bar to enable the two battery strings to be connected in parallel, conveying the two battery strings connected in parallel to a stacking stage, and executing the step A14;
step A7, in the series welding stage, paving a bus bar on a welding strip extension section of a first end of the other battery string formed by connecting back contact battery pieces in series, wherein the welding strip extension section of the first end of the other battery string is connected with a second electrode main grid line of the end back contact battery piece, the welding strip extension section is contacted with a first main surface of the bus bar, and the polarity of the second electrode main grid line is opposite to that of the first electrode main grid line;
Step A8, welding the welding strip extension section of the other battery string to the bus bar;
step A9, paving an insulating cushion layer on the end back contact battery piece connected with the welding strip extension section of the other battery string;
step A10, turning the bus bar in the direction of the other battery strings, controlling the bus bar to be turned over to the position above the end back contact battery piece connected with the welding strip extension section, enabling the second main surface of the bus bar to be opposite to the back surface of the end back contact battery piece, enabling the insulating cushion layer to be located between the second main surface of the bus bar and the back surface of the end back contact battery piece, and enabling the first main surface of the bus bar to be opposite to the second main surface;
step A11, paving another battery string connected in series by the back contact battery piece 11 in the extending direction of the other battery string, and controlling a welding strip extending section of the first end of the other battery string to be positioned on the first main surface of the bus bar;
step A12, welding the second welding strip extension section and the first bus bar so as to enable the two battery strings of the A11 to be connected in parallel, conveying the two battery strings connected in parallel to a laminating stage, and executing a step A14;
step A13, paving a cover plate on the stacking table, and paving a pre-packaging adhesive film on the cover plate;
Step A14, alternately placing the step A6 and the step A14 according to a circuit structure required by the photovoltaic module to obtain two parallel structures;
step A15, connecting ends in a circuit structure required by the photovoltaic module in series, placing bus bars on the welding strip extension sections of the ends, close to the edges of the photovoltaic module, of the two parallel structures which are alternately placed, welding the welding strip extension sections onto the bus bars, and turning over the bus bars;
step A16, connecting bus bars of the middle area according to the serial-parallel connection of the middle area in the circuit structure required by the photovoltaic module;
step A17, paving a rear packaging adhesive film on the battery string, and paving a back plate on the rear packaging adhesive film;
and step A18, arranging the bus outgoing lines and laminating.
Example 2
Step B1, paving a cover plate on a stacking table, and paving a pre-packaging adhesive film on the cover plate;
step B2, circularly executing the steps A1 to A12 on the front packaging adhesive film according to a circuit structure required by the photovoltaic module so as to obtain two parallel battery strings and two other parallel battery strings which are alternately arranged, wherein the middle polarity of the two parallel battery strings is opposite to the middle polarity of the two other parallel battery strings;
Step B3, connecting ends in a circuit structure required by the photovoltaic module in series, placing bus bars on the welding strip extension sections of the ends, close to the edges of the photovoltaic module, of the two parallel structures which are alternately placed, welding the welding strip extension sections onto the bus bars, and turning over the bus bars;
wherein two battery strings connected in series at the edges can be connected with the same bus bar, and the serial-parallel connection between four battery strings in the middle area can be realized through the same bus bar.
Step B4, paving a rear packaging adhesive film on the battery string, and paving a back plate on the rear packaging adhesive film;
step B5, adhering the adhesive tape to the confluence outlet hole and laminating;
and B6, removing the adhesive tape, and welding the bus-out wire through the bus-out hole.
In summary, the technical solutions provided by the embodiments of the present invention are as follows:
the preparation method of the photovoltaic module comprises the following steps:
step a1, laying a first bus bar 20 on a first welding strip extension 12 of a first end of a laid first battery string 10, wherein the first battery string 10 is formed by serially connecting back contact battery pieces 11, and the first welding strip extension 12 is contacted with a first main surface 21 of the first bus bar 20;
step b1, welding the first welding strip extension 12 onto the first bus bar 20;
Step c1, paving an insulating cushion layer 30;
step d1, turning the first bus bar 20 in the direction of the first battery string 10, controlling the first bus bar 20 to be turned over the end back contact battery piece 11' connected with the first welding strip extension section 12, enabling the second main surface 22 of the first bus bar 20 to be opposite to the back surface of the end back contact battery piece 11', and enabling the insulating cushion 30 to be located between the second main surface 22 of the first bus bar 20 and the back surface of the end back contact battery piece 11', wherein the first main surface 21 and the second main surface 22 of the first bus bar 20 are opposite to each other;
step e1, laying a new first battery string 10' formed by serially connecting back contact battery pieces 11 in the extending direction of the first battery string 10, and controlling a second welding strip extension section 12' of a first end of the new first battery string 10' to be positioned on the first main surface 22 of the first bus bar 20;
step f1, welding the second welding strip extension 12 'and the first bus bar 20 to connect the first battery string 10 in parallel with the new first battery string 10'.
According to claim 2, the preparation method of claim 1, step c1 includes:
An insulating cushion layer 30 is paved at the edge area of the end back contact battery piece 11';
or alternatively, the process may be performed,
an insulating mat 30 is adhered to the second main surface 22 of the first bus bar 20.
According to claim 3, the preparation method according to claim 1, the step d1 includes:
the first bus bar 20 is turned over by 180 ° in the direction in which the first battery string 10 is located.
According to claim 4, the preparation method of claim 1,
in step a1, the width of overlap between the first ribbon extension 12 and the first bus bar 20 laid thereon is not less than one-half of the width of the first bus bar 20 and not more than the width of the first bus bar 20;
and/or the number of the groups of groups,
in step e1, the width of overlap between the second ribbon extension 12' and the first bus bar 20 is not less than one-half the width of the first bus bar 20 and not more than the width of the first bus bar 20.
Technical solution 5, the preparation method according to claim 1, step e1 includes:
controlling the spacing between the first and second solder strip extensions 12, 12' on the first major surface 22 to be 1mm to 2mm;
and/or the number of the groups of groups,
the length of the first welding strip extension section 12 is 5 mm-20 mm;
And/or the number of the groups of groups,
the length of the second welding strip extension section 12' is 5 mm-20 mm.
Technical solution 6, the preparation method according to the technical solution 1, further includes:
the photovoltaic module includes a plurality of cell strings and a plurality of second bus bars 40 disposed at ends,
the preparation method further comprises the following steps: laying and welding the second bus bars 40 on the third welding strip extension section of the second end of each battery string, and laying an insulating cushion 30 between the second bus bars 40 and the battery strings connected with the second bus bars, so that each second bus bar 40 is electrically connected with one battery string or two adjacent battery strings, wherein the second end is positioned at the edge of the photovoltaic module;
the second bus bar 40 is positioned at the rear surface of the battery string to which it is connected by folding.
Claim 7, the production method according to any one of claims 1 to 5,
step a1 to step f1 are completed in the series welding stage;
or alternatively, the process may be performed,
steps a1 to f1 are completed in the lamination stage.
Claim 8, the preparation method according to any one of claims 1 to 5,
the width of the insulating pad 30 is greater than the width of the bus bar with which it is in contact;
and/or the number of the groups of groups,
the length of the insulating mat 30 is greater than the length of the bus bar with which it is in contact;
And/or the number of the groups of groups,
the insulating mat 30 is a single layer or a laminated film made of one or more of the following materials:
PET, EVA, EVE and POE.
The method for manufacturing a photovoltaic module according to claim 9, further comprising a lamination stage for manufacturing a photovoltaic module, wherein,
the lamination stage of photovoltaic module preparation includes:
paving a cover plate 50, and paving a front packaging adhesive film 60 on the cover plate;
paving and connecting a plurality of first battery strings 10, a plurality of new first battery strings 10' and a plurality of second battery strings 50 on the front packaging adhesive film 60 according to a preset serial-parallel structure;
a rear packaging film 60 'is layered and laid, and a back plate 70 is laid on the rear packaging film 60'.
According to claim 10, the method for manufacturing a photovoltaic module according to claim 9, further comprises, in a lamination stage of manufacturing the photovoltaic module:
the first bus-bar outgoing lines 80 which are respectively divided into two bus-bars are adjusted to pass through the corresponding outgoing holes on the rear packaging adhesive film 60' and the backboard 70, the first bus-bar outgoing lines 80 are flattened and laminated, wherein the flattened two bus-bar outgoing lines 80 respectively form a linear structure with the bus-bars connected with the first bus-bar outgoing lines, and the flattened two bus-bar outgoing lines 80 are intersected and do not overlap.
The method of claim 11, the method of claim 10, wherein the width of the first bus bar 80 is not more than half the width of the bus bar.
According to claim 12, the method for manufacturing a photovoltaic module according to claim 9, further comprises, in a lamination stage of manufacturing the photovoltaic module:
filling a removable member in a bus bar area corresponding to the rear packaging adhesive film 60' and the lead-out hole on the back plate 70, and removing the removable member after lamination;
the second bus bar 80' is welded to the bus bar region corresponding to the lead-out hole through the lead-out hole.
The method for manufacturing a photovoltaic module according to claim 13, according to claim 1 or 9, further comprises:
for the bus bar to which the third bus bar outlet 80 "is connected,
folding back the connection region of the third bus bar outgoing line 80″ and the bus bar, and flattening and shaping the folded-back connection region;
the folded-back configuration of the flattened shaped connection area remains unchanged during the third buss-out line 80 "passes through the out-hole and lamination stage.
Technical solution 14, the method for manufacturing a photovoltaic module according to claim 13,
The width of flattening and shaping is 1 mm-4 mm.
Technical scheme 15, a photovoltaic module includes: the first cell string 10 is formed by the back contact cell pieces 11 connected in series, the new first cell string 10' is formed by the back contact cell pieces 11 connected in series, the first bus bar 20 and the insulating mat 30, wherein,
a first strap extension 12 opposite a first end of the first string 10 is welded to a first major surface 21 of the first bus bar 20, and the first bus bar 20 is folded over to the back surface of the end back contact cell 11 'of the first end of the first string 10, a second major surface 22 of the first bus bar 20 opposite the first major surface 21 being opposite the back surface of the end back contact cell 11';
the insulating mat 30 is located between the second main surface 22 of the first bus bar 20 and the end back contact battery piece 11';
the second ribbon extension 12 'of the first end of the new first cell string 10' is welded to the first major surface 21 of the first bus bar 20.
The photovoltaic module according to claim 16, the photovoltaic module according to claim 15, further comprising:
a plurality of battery strings arranged, wherein the first battery string 10 and the new first battery string 10' belong to two of the plurality of battery strings;
The bus bars for connecting two battery strings in series are arranged on the back surfaces of the battery strings connected in series in a turnover manner, and the insulating cushion layer 30 is arranged between the bus bars and the back surfaces of the corresponding battery strings.
The photovoltaic module of claim 17, claim 15, further comprising: two first lead-out bus bars for connection with an external junction box and a lead-out hole, wherein,
each of the first bus bars includes a first bus bar 80;
the two first bus-out wires 80 pass through the lead-out holes, and the projections of the two first bus-out wires 80 on any one of the first bus-out wires are not overlapped with each other.
The photovoltaic module of claim 18, claim 15, further comprising:
and a second bus bar 80' welded to the bus bar region corresponding to the lead hole through the lead hole.
Technical solution 19 the photovoltaic module according to the technical solution 17,
the width of the first bus bar 80 is no more than one half of the width of the first bus bar.
The photovoltaic module of claim 20, claim 15, further comprising: two second outgoing bus bars for connection to an external junction box, wherein,
A third bus-out wire 80' is respectively connected to the adjacent end of each second bus-out wire;
the connection area of each of the second bus bar and the third bus bar 80″ to which it is connected is a flattened return structure.
The above steps are presented merely to aid in understanding the method, structure, and core concept of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made to the present invention without departing from the principles of the invention, and such changes and modifications are intended to be included within the scope of the appended claims.
Claims (10)
1. A method of manufacturing a photovoltaic module, comprising:
step a1, laying a first bus bar (20) on a first welding strip extension section (12) of a first end of a laid first battery string (10), wherein the first battery string (10) is formed by serially connecting back contact battery pieces (11), and the first welding strip extension section (12) is contacted with a first main surface (21) of the first bus bar (20);
step b1, welding the first welding strip extension section (12) to the first bus bar (20);
step c1, paving an insulating cushion layer (30);
step d1, turning over the first bus bar (20) in the direction of the first battery string (10), controlling the first bus bar (20) to be turned over the end back contact battery piece (11 ') connected with the first welding strip extension section (12), enabling the second main surface (22) of the first bus bar (20) to be opposite to the back surface of the end back contact battery piece (11 '), and enabling the insulating cushion layer (30) to be located between the second main surface (22) of the first bus bar (20) and the back surface of the end back contact battery piece (11 '), wherein the first main surface (21) of the first bus bar (20) is opposite to the second main surface (22);
Step e1, laying a new first battery string (10 ') which is formed by serially connecting back contact battery pieces (11) in the extending direction of the first battery string (10), and controlling a second welding strip extension section (12 ') of a first end of the new first battery string (10 ') to be positioned on the first main surface (22) of the first bus bar (20);
step f1, welding the second welding strip extension section (12 ') and the first bus bar (20) so as to connect the first battery string (10) in parallel with the new first battery string (10').
2. The method of claim 1, wherein step c1 comprises:
an insulating cushion layer (30) is paved at the edge area of the end part back contact battery piece (11');
or alternatively, the process may be performed,
an insulating mat (30) is adhered to the second main surface (22) of the first bus bar (20).
3. The method of claim 1, wherein step d1 comprises:
the first bus bar (20) is turned 180 DEG in the direction in which the first cell string (10) is located.
4. The method according to claim 1, wherein,
in step a1, the width of the overlap between the first weld extension (12) and the first bus bar (20) laid thereon is not less than one half of the width of the first bus bar (20) and not more than the first bus bar (20) width;
And/or the number of the groups of groups,
in step e1, the width of overlap between the second ribbon extension (12') and the first bus bar (20) is not less than one half of the width of the first bus bar (20) and not more than the width of the first bus bar (20).
5. The method of claim 1, wherein step e1 comprises:
controlling the spacing between the first and second solder strip extensions (12, 12') on the first major surface (22) to be 1-2 mm;
and/or the number of the groups of groups,
the length of the first welding strip extension section (12) is 5 mm-20 mm;
and/or the number of the groups of groups,
the length of the second welding strip extension section (12') is 5 mm-20 mm.
6. The method according to claim 1, wherein,
comprises a plurality of battery strings and a plurality of second bus bars (40) arranged at the end parts aiming at the photovoltaic module,
the preparation method further comprises the following steps: -laying and welding said second bus bars (40) on a third ribbon extension of a second end of each of said strings, and laying an insulating mat (30) between said second bus bars (40) and the strings to which they are connected, such that each second bus bar (40) is electrically connected to one or two adjacent of said strings, wherein said second end is located at an edge of said photovoltaic module;
The second bus bar (40) is positioned on the back of the battery string to which it is connected by folding.
7. The process according to any one of claim 1 to 5, wherein,
step a1 to step f1 are completed in the series welding stage;
or alternatively, the process may be performed,
steps a1 to f1 are completed in the lamination stage.
8. A photovoltaic module, comprising: the back contact battery pieces (11) are connected in series to form a first battery string (10), the back contact battery pieces (11) are connected in series to form a new first battery string (10'), a first bus bar (20) and an insulating cushion layer (30), wherein,
a first weld strip extension (12) opposite a first end of the first cell string (10) is welded to a first main surface (21) of the first bus bar (20), and the first bus bar (20) is folded over to the back surface of an end back contact cell (11 ') of the first end of the first cell string (10), a second main surface (22) of the first bus bar (20) opposite the first main surface (21) being opposite the back surface of the end back contact cell (11');
the insulating pad layer (30) is located between the second main surface (22) of the first bus bar (20) and the end back contact battery piece (11');
a second weld strip extension (12 ') of the first end of the new first cell string (10') is welded to the first major surface (21) of the first bus bar (20).
9. The photovoltaic module of claim 8, further comprising: a lead-out hole and two first lead-out bus bars for connection with an external junction box, wherein,
each of the first lead-out bus bars includes a first lead-out bus line (80);
the two first bus outgoing lines (80) penetrate out of the outgoing holes, and projections of the two first bus outgoing lines (80) on any one of the first bus outgoing lines are not overlapped with each other.
10. The photovoltaic module of claim 8, further comprising:
and a second bus bar line (80') welded to the bus bar region corresponding to the lead hole through the lead hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310694662.2A CN116705885A (en) | 2023-06-12 | 2023-06-12 | Preparation method of photovoltaic module and photovoltaic module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310694662.2A CN116705885A (en) | 2023-06-12 | 2023-06-12 | Preparation method of photovoltaic module and photovoltaic module |
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| CN116705885A true CN116705885A (en) | 2023-09-05 |
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| CN202310694662.2A Pending CN116705885A (en) | 2023-06-12 | 2023-06-12 | Preparation method of photovoltaic module and photovoltaic module |
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| Country | Link |
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