CN115498069A - Solar cell string connection method and photovoltaic module - Google Patents
Solar cell string connection method and photovoltaic module Download PDFInfo
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- CN115498069A CN115498069A CN202211335988.8A CN202211335988A CN115498069A CN 115498069 A CN115498069 A CN 115498069A CN 202211335988 A CN202211335988 A CN 202211335988A CN 115498069 A CN115498069 A CN 115498069A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000003466 welding Methods 0.000 claims abstract description 97
- 239000003292 glue Substances 0.000 claims abstract description 54
- 239000004020 conductor Substances 0.000 claims abstract description 36
- 229910000679 solder Inorganic materials 0.000 claims description 35
- 238000004513 sizing Methods 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 238000010030 laminating Methods 0.000 claims description 7
- 238000005476 soldering Methods 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052709 silver Inorganic materials 0.000 abstract description 11
- 239000004332 silver Substances 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 5
- 101150030164 PADI3 gene Proteins 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 239000000084 colloidal system Substances 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 239000002390 adhesive tape Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
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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
- H01L31/02—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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- 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
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Microelectronics & Electronic Packaging (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Manufacturing & Machinery (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a solar cell string connection method, which comprises the following steps: applying glue to a second area of the cell; applying a conductive material on the surface of the Pad in the first area of the cell; and laying a second welding strip at the glue applying position of the second area, and laying a first welding strip at the main grid line of the first area and the conductive material. Through the implementation of the technical scheme, the design that partial non-main grid and non-pad points can be realized (only the main grid line of the first area is reserved, and the main grid line of the second area is omitted), and the using amount of the silver paste of the battery is greatly saved. The invention also discloses a photovoltaic module manufactured by the solar cell string connection method.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to a solar cell string connection method and a photovoltaic module.
Background
The traditional single-side cell photovoltaic module has the following technical principle that the connection process of an internal cell piece and a tinned copper strip (namely a solder strip) is as follows: the solder strip is pretreated by the soldering flux in advance, and then is in contact welding (after temperature and time) with Pad points in the main grid lines of the battery piece, and finally electrical contact is achieved.
The premise that the good electrical contact is realized by the welding process is that the cell piece needs to be provided with the main grid line, and the main grid line needs to be provided with the pad point which is large enough to ensure the welding contact area, so that the welding effect of the electrical contact is achieved.
Silver paste at the main grid line and the Pad point is expensive, so that the overall cost of the battery assembly is not superior, and the welding technology is easy to eliminate in the development of subsequent industries along with the continuous and large development of the current overall industry.
Disclosure of Invention
In view of this, the invention provides a solar cell string connection method and a photovoltaic module, which can save the usage of cell silver paste.
In order to achieve the purpose, the invention provides the following technical scheme:
a solar cell string connection method, comprising the steps of:
sizing the second area of the cell;
applying a conductive material on the surface of the Pad in the first area of the cell;
laying a second welding strip at the second area glue applying position;
and laying a first welding strip at the first region main grid line and the conductive material.
Preferably, the surface of the Pad in the first region of the battery piece is filled with a conductive material, and the method includes:
and filling a conductive material on the surface of the Pad of the first region of the cell until the height of the main grid line of the adjacent first region is not lower than that of the main grid line of the first region.
Preferably, the surface of the Pad in the first region of the battery piece is filled with a conductive material, and the method includes:
and applying the conductive material to the Pad surface of the first area of the cell until the height is 10-300 microns.
Preferably, the conductive material is a conductive solder paste, a conductive adhesive or a conductive adhesive tape.
Preferably, the sizing is performed on the second area of the battery piece, and the sizing comprises the following steps:
glue is applied to the second welding strip laying position of the second region of the cell, and the glue applying point is located between every two adjacent first region fine grid lines.
Preferably, the number of the sizing points is more than or equal to 2, and at least two sizing points are respectively positioned on two sides of the battery piece.
Preferably, after the laying of the second solder strip and the laying of the first solder strip, the method further comprises the steps of:
curing the glue applying part, and then laminating the first welding strip, the second welding strip and the battery piece, wherein heat is generated in the laminating process to enable the second welding strip and the first welding strip to be effectively and electrically connected with the battery piece;
or, the glue applying part is solidified, then the first welding strip, the second welding strip and the battery piece are welded, and heat is generated in the welding process to enable the second welding strip and the first welding strip to be effectively and electrically connected with the battery piece;
or welding the first welding strip, the second welding strip and the battery piece, generating heat in the welding process to enable the glue applying part to be solidified, and enabling the second welding strip and the first welding strip to be effectively and electrically connected with the battery piece.
Preferably, after the welding, the method further comprises the steps of:
and repeating the second area sizing, the conductive material application and the solder strip laying to form the battery string.
Preferably, the battery piece is a single-sided battery or a double-sided battery.
A photovoltaic module, comprising: solar energy a battery string; the solar cell string is manufactured by adopting the solar cell string connecting method.
According to the technical scheme, the solar cell string connection method and the photovoltaic module provided by the invention can realize the design of partial no-main-grid no-pad points (only the main grid line of the first area is reserved, and the main grid line of the second area is omitted), and greatly save the consumption of the silver paste of the cell.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of sizing for a battery piece according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the Pad point in the first area after the solder paste is applied to the Pad point;
FIG. 3 is a schematic structural diagram of solder strip laying according to an embodiment of the present invention;
fig. 4 is a schematic top view of a single-sided battery provided in an embodiment of the present invention after a solder strip is connected thereto;
fig. 5 is a schematic structural diagram of components of a battery cell according to an embodiment of the invention;
fig. 6 is a schematic cross-sectional structure along the top of the first region bus line (parallel to the bus line);
fig. 7 is a schematic flow chart of a solar cell string connection method according to an embodiment of the present invention.
The solar cell module comprises a solar cell (silicon wafer) 1, a glue 2, a Pad3, a conductive material 4, a first area main grid line 5, a first welding strip 6, a second welding strip 7, a first area fine grid line 8, a second area fine grid line 9, a second area non-main grid line 10 and a second area glue applying area 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The solar cell string connection method provided by the embodiment of the invention comprises the following steps:
s1, applying glue to a second area of the battery piece 1, as shown in figure 1;
s2, applying a conductive material 4 on the surface of the Pad3 in the first area of the battery piece 1, as shown in FIG. 2;
s3, laying a second welding strip 7 at the glue applying position of the second area, as shown in figure 3;
a first solder strip 6 is laid at the first regional bus bar 5 and the conductive material 4 as shown in fig. 6. It should be noted that the sequence of steps S1 and S2 is only a specific implementation, and may also be exchanged or performed simultaneously, all within the protection scope of the present disclosure; the laying sequence of the two solder strips in the step S3 is the same, and is not described again.
According to the technical scheme, the second welding strip 7 is laid in the second area of the cell piece 1 through glue application, and the main grid line of the second area is omitted; in the first area, considering that the height of the first area thin grid line is higher than that of the silver paste at Pad3 by using aluminum paste, in order to realize good welding between the first solder strip 6 and the silver paste at Pad3, the conductive material 4 is applied on the Pad3 in advance for filling so as to form effective electrical connection. Through the implementation of the technical scheme, the design that partial main grid and pad points do not exist can be realized (only the main grid line of the first area is reserved, and the main grid line of the second area is omitted), and the using amount of the silver paste of the battery is greatly saved.
Preferably, the surface of the Pad3 in the first region of the battery piece 1 is filled with a conductive material 4, which includes:
the surface of the Pad3 in the first region of the battery piece 1 is filled with the conductive material 4 to a height not lower than that of the adjacent main grid line 5 in the first region, and the structure can be shown in fig. 2.
Specifically, the surface of Pad3 in the first region of the battery piece 1 is filled with a conductive material 4, which includes:
applying the conductive material 4 on the surface of the Pad3 in the first region of the battery piece 1 to a height of 10-300 microns, wherein the thickness of the conductive material 4 needs to exceed the height of the aluminum paste, and the structure of laying the first solder strip 6 after filling can be shown in fig. 6.
In the present embodiment, the conductive material 4 is a conductive solder paste, a conductive adhesive, or a conductive tape. The planar shape of the conductive material preferably corresponds to the shape of the first area PAD, such as a circle.
Further, in step S1, applying glue to a second region of the battery sheet 1, including:
glue is applied to the laying position of the second welding strips 7 in the second area of the cell 1, and a glue applying point is arranged between two adjacent first area fine grid lines 8, the structure of the glue applying device can be shown in fig. 5, and glue is applied to the surface of each second welding strip 7 passing through the area in the second area of the cell 1.
Preferably, the number of the glue applying points is more than or equal to 2, at least two glue applying points are respectively positioned on two sides of the battery piece 1, and the structure can be shown in figure 5, so that the gluing reliability is improved.
In the present embodiment, after the laying of the second solder strip 7 and the laying of the first solder strip 6 in step S3, the method further includes the steps of:
s4, corresponding to a low-temperature route: curing the glue applying part, laminating the first welding strip 6, the second welding strip 7 and the battery piece 1, and generating heat in the laminating process to enable the second welding strip 7 and the first welding strip 6 to form effective electrical connection with the battery piece 1;
or, S4, corresponding to a high temperature route: solidifying the glue applying part, then welding the first welding strip 6, the second welding strip 7 and the battery piece 1, and generating heat in the welding process to enable the second welding strip 7, the first welding strip 6 and the battery piece 1 to be effectively electrically connected;
or, S4, corresponding to another high temperature route: the first welding strip 6, the second welding strip 7 and the battery piece 1 are welded, heat is generated in the welding process to enable the glue applying part to be solidified, and the second welding strip 7 and the first welding strip 6 are effectively and electrically connected with the battery piece 1.
Further, after the welding of step S4, the method further includes the steps of:
and S5, repeating the second area sizing, the conductive material 4 application and the solder strip laying to form the battery string.
Specifically, the battery sheet 1 may be a single-sided battery such as IBC, HBC, TBC, or the like.
An embodiment of the present invention further provides a photovoltaic module, including: a solar cell string; the solar cell string is manufactured by adopting the solar cell string connecting method. In view of the above, the photovoltaic module of the present disclosure employs the solar cell string connection method, so that the photovoltaic module also has corresponding beneficial effects, which can specifically refer to the foregoing description and is not repeated herein.
The present solution is further described below with reference to specific embodiments:
the invention provides a solar cell string connection method, wherein a cell string comprises a plurality of serially connected cell pieces, two adjacent cell pieces are connected through a welding strip, and the process steps are as follows:
firstly, glue 2 is applied to a designated position (glue position) of a battery piece 1 (a single-sided battery or a double-sided battery), as shown in figure 1;
secondly, applying a conductive material 4 (such as a conductive solder paste) on the Pad3 of the first region (such as the P region), as shown in the cross-sectional view of FIG. 2;
thirdly, paving a first welding strip 6 (such as a positive electrode welding strip) on one surface of the battery piece 1 which is glued with the glue 2 and applied with the conductive solder paste at the Pad3 for connection;
fourthly, solidifying and welding at low temperature or high temperature;
and fifthly, repeating the steps of the first step, the second step, the third step and the fourth step to form the battery string.
As shown in fig. 1:
1) Glue 2 is applied to a single-sided cell 1 at a designated position (glue spot as in fig. 5), wherein the glue 2 can be conductive glue, conductive tape or non-conductive glue.
2) Since the first region thin gate line 8 (e.g., P region thin gate line) is made of aluminum paste, and thus has poor solderability in contact with the first solder strip 6 (e.g., positive solder strip), and good electrical contact is not easily achieved, the single-sided battery herein adopts a structure in which the P region has a main gate (including PAD 3) and the N region has no main gate, as shown in fig. 4.
3) The conductive adhesive can also be optical melt adhesive, thermosensitive adhesive, pressure-sensitive adhesive and the like.
4) The battery piece 1 is a single-sided battery (such as an IBC, HBC, TBC, or other single-sided battery).
5) The overall approximate grid line structure of the cell sheet 1 is shown in fig. 5.
As shown in fig. 2: a schematic diagram of the P-region structure and the conductive filler (i.e., the conductive material 4) of the P-type IBC cell of this embodiment is shown.
As shown in fig. 3:
1) Bonding with solder strips, followed by lamination, and the like. The curing of the glue or the adhesive tape and the low-temperature welding can be included, and the curing mode comprises light irradiation, heating, hot pressing, ultraviolet irradiation and the like.
2) The heating method comprises infrared heating, heat transfer, induction heating, hot air heating, contact heating (such as laminator heating), etc., and the temperature range is 100-280 deg.C.
3) When the welding strips are placed, one welding strip can be laid at one time, and a plurality of welding strips can also be laid at one time. Note that the first solder strip 6 (e.g., positive solder strip) does not contact the second area fine grid lines 9 (e.g., negative electrode fine grid lines), and the second solder strip 7 (e.g., negative electrode solder strip) does not contact the first area fine grid lines 8 (e.g., positive electrode fine grid lines).
4) The cross section of the welding strip is flat, circular, trapezoidal and the like, the shape of the welding strip is not limited by the application, and the welding strip can be a low-temperature welding strip or a normal-temperature welding strip.
5) The welding strip can be a reel welding strip or a fixed-length welding strip, and the welding strip positioned between the battery pieces can be punched by the buffer device to form a buffer structure (such as a shape like Z).
6) The designated locations (i.e., glue locations) on the battery pieces may be marked by screen printing.
And others:
the connection scheme for realizing the single-sided battery comprises the following devices:
the device comprises a glue point position positioning device, a glue applying device, a conductive solder paste positioning and applying device, a battery string pre-curing device and other strip devices of the series welding machine (such as a welding strip pulling device, a welding strip placing and positioning mechanism, a welding strip flattening mechanism and the like).
Regarding the process route, taking a P-type IBC cell as an example:
1) Low-temperature route: because the thin grid line in the first region (P region) of the battery uses the aluminum paste, the height of the aluminum paste is about 10um or more than that of the silver paste at the Pad point, and in order to realize good welding of the silver paste at the solder strip and the PAD point, a conductive material is applied to the Pad point in advance for filling. The filler is preferably low-temperature conductive tin paste, low-temperature conductive adhesive or low-temperature conductive adhesive tape, the thickness of the filler needs to exceed the height of the aluminum paste, generally more than 10um, and the shape of the PAD in the P area is preferably consistent with the planar shape of the conductive material, such as a circle; each solder strip in the second area (N area) is subjected to glue dispensing treatment through the surface of the area, the glue dispensing quantity is more than or equal to 2, the second area adopts a non-main grid design, and the glue dispensing position is in the N area glue dispensing area shown in figure 5, and can be between the thin grid lines of the N area electrodes or on the thin grid lines. The size of the glue dots is not limited, and the diameter is preferably more than 0.05mm. After the welding strip is connected with the battery, the colloid in the P area and/or the colloid in the N area are solidified and then welded at low temperature; or after the welding strip is connected with the battery, the colloid in the P area and/or the colloid in the N area are firstly solidified, and then the welding strip is effectively electrically connected with the battery through heat generated in the laminating process.
2) High-temperature route: the thin grid line in the first region (P region) of the battery uses aluminum paste, the height of the aluminum paste is about 10 mu m or more higher than that of silver paste at the Pad, and in order to realize good welding of the solder strip and the silver paste at the PAD, a conductive material is applied to the Pad in advance for filling. The filler is preferably conductive tin paste, conductive adhesive or conductive adhesive tape, the thickness of the filler is required to exceed the height of the aluminum paste, usually >10um, the shape of the P area PAD is preferably consistent with the planar shape of the conductive material, such as a circle; each solder strip in the second area (N area) is subjected to glue dispensing treatment through the surface of the area, the glue dispensing quantity is more than or equal to 2, the second area adopts a non-main grid design, and the glue dispensing position is in the N area glue dispensing area shown in figure 5, can be between the thin grid lines of the N area electrodes, and can also be on the thin grid lines. The size of the glue dots is not limited, preferably >0.05mm in diameter. After the welding strip is connected with the battery, the colloid in the P area and/or the colloid in the N area are solidified and then welded; or the colloid in the P area and/or the colloid in the N area realize the solidification of the colloid through the heat generated in the welding process, and the welding strip and the battery form reliable electrical connection.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A solar cell string connection method is characterized by comprising the following steps:
applying glue to a second area of the cell sheet (1);
applying a conductive material (4) on the surface of the Pad (3) of the first area of the battery piece (1);
laying a second welding strip (7) at the second area sizing;
and laying a first welding strip (6) at the first region main grid line (5) and the conductive material (4).
2. The solar cell string connection method according to claim 1, wherein the filling of the conductive material (4) on the surface of the Pad (3) in the first region of the cell sheet (1) comprises:
and filling a conductive material (4) on the surface of the Pad (3) in the first region of the cell (1) to a height not lower than that of the adjacent main grid line (5) in the first region.
3. The solar cell string connection method according to claim 1, wherein the step of filling the conductive material (4) on the surface of the Pad (3) in the first region of the cell sheet (1) comprises:
and applying the conductive material (4) on the surface of the Pad (3) of the first area of the battery piece (1) to a height of 10-300 microns.
4. The solar cell string connection method according to claim 1, wherein the conductive material (4) is a conductive solder paste, a conductive adhesive, or a conductive tape.
5. The solar cell string connection method according to claim 1, wherein the glue is applied to the second region of the cell sheet (1) and comprises:
glue is applied to the laying position of the second welding strip (7) in the second area of the battery piece (1), and a glue applying point is arranged between every two adjacent first area fine grid lines (8).
6. The solar cell string connection method according to claim 5, wherein the number of the glue applying points is greater than or equal to 2, and at least two glue applying points are respectively located on two sides of the cell sheet (1).
7. The solar cell string connection method according to claim 1, further comprising, after the laying of the second solder strip (7) and the laying of the first solder strip (6), the steps of:
curing the glue applying part, and then laminating the first welding strip (6), the second welding strip (7) and the battery piece (1), wherein heat is generated in the laminating process to enable the second welding strip (7) and the first welding strip (6) to be effectively and electrically connected with the battery piece (1);
or, curing the glue applying position, and then welding the first welding strip (6), the second welding strip (7) and the battery piece (1), wherein heat is generated in the welding process to enable the second welding strip (7) and the first welding strip (6) to be effectively and electrically connected with the battery piece (1);
or welding the first welding strip (6), the second welding strip (7) and the battery piece (1), generating heat in the welding process to enable the glue applying part to be solidified, and enabling the second welding strip (7) and the first welding strip (6) to be effectively and electrically connected with the battery piece (1).
8. The solar cell string connecting method according to claim 7, further comprising, after the soldering, the steps of:
repeating the second area sizing, applying the conductive material (4) and laying the solder strip to form the battery string.
9. The solar cell string connection method according to claim 1, wherein the cell sheet (1) is a single-sided cell or a double-sided cell.
10. A photovoltaic module, comprising: a solar cell string; characterized in that the solar cell string is manufactured by the solar cell string connection method according to any one of claims 1 to 9.
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| CN202211335988.8A CN115498069A (en) | 2022-10-28 | 2022-10-28 | Solar cell string connection method and photovoltaic module |
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| CN202211335988.8A CN115498069A (en) | 2022-10-28 | 2022-10-28 | Solar cell string connection method and photovoltaic module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116995109A (en) * | 2023-08-29 | 2023-11-03 | 正泰新能科技有限公司 | Low-temperature welded back contact photovoltaic module and preparation method thereof |
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2022
- 2022-10-28 CN CN202211335988.8A patent/CN115498069A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116995109A (en) * | 2023-08-29 | 2023-11-03 | 正泰新能科技有限公司 | Low-temperature welded back contact photovoltaic module and preparation method thereof |
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