CN108687418B - Solder strip connection method of solar cell - Google Patents
Solder strip connection method of solar cell Download PDFInfo
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- CN108687418B CN108687418B CN201710215588.6A CN201710215588A CN108687418B CN 108687418 B CN108687418 B CN 108687418B CN 201710215588 A CN201710215588 A CN 201710215588A CN 108687418 B CN108687418 B CN 108687418B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 229910000679 solder Inorganic materials 0.000 title claims description 68
- 238000003466 welding Methods 0.000 claims abstract description 171
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000003475 lamination Methods 0.000 abstract description 10
- 238000005476 soldering Methods 0.000 description 6
- 239000002313 adhesive film Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a welding strip connecting method of a solar cell, which aims at the technical problems of more welding spots and high manufacturing cost in the converging welding process of a solar cell module in the prior art, and effectively reduces the traditional lamination welding workload of three-main-grid to five-main-grid modules by 60-80%, reduces the converging welding workload of the multi-main-grid modules by more than 90% and greatly reduces the manufacturing cost by the arrangement of the welding strip connecting method.
Description
Technical Field
The invention relates to a solder strip connecting method of a solar cell, which is used for reducing the number of welding points in the welding process of the solar cell. Belongs to the technical field of solar cell production.
Background
Traditional solar cell has 3 ~ 5 main bars usually, and the battery piece is picked up by pickup apparatus after through visual positioning, places on welding the area, and another row interconnector welds the area in its upper electrode place behind the battery location, and under transmission device's drive, the battery passes through under heating element effects such as infrared, electromagnetic induction, hot-blast according to certain beat, interval in order, and the positive and negative electrodes of battery that realizes through the interconnector weld the area and link to each other to realize the series connection process of battery. In the lamination welding process, the battery strings are usually placed on the adhesive film according to the designed intervals of the assemblies, and under the action of electric soldering iron, the battery strings are connected through bus bar welding strips, so that circuit connection among the battery strings is realized. The assembly product of a typical 156 × 156mm three-main grid polycrystalline cell and 6 strings × 8 pieces/string is taken as an example for explanation: the single-string battery after the series welding process is completed is shown in fig. 1, wherein 1 is a triple-main-grid battery; 2 is a first/second interconnector solder strip; 3 is a first bus bar solder strip; subsequently, the single-string batteries are subjected to confluence to form a solar battery string group as shown in fig. 2, wherein 3 is a first bus bar welding strip; 4, a component lead-out wire welding strip; 5, adding a welding point between the first interconnecting bar and the first bus bar; and 6 is a welding point of the first bus bar and the leading-out wire. In the confluence process, corresponding welding points are still manually welded in most factories, and the workload is very large. Even in the relatively simplified assembly connection scheme of the split junction box, the total number of welding points in the confluence process is 42, wherein: there are 36 total bus bar and interconnect bar pads and 6 bus bar and lead out pad pads as shown in figure 2.
With the development of high-efficiency battery assembly technology, the multi-main-grid technology will gradually become the mainstream of the future high-efficiency assembly technology. The nominal maximum output power of the multi-main-grid solar cell module can be improved by 2.5-3%. The number of the main gates of the multi-main gate battery is usually 10-15. Taking a typical 12-grid as an example, if the conventional series welding method is still adopted, the single-string battery produced is shown in fig. 3, in which 7 is a multi-master-grid battery; in the process of bus welding, the number of welding points of the interconnector and the bus bar can be changed into 144, and the positions of the welding points of the newly added and bus bars are marked by round dots; the assembly is connected according to the comparatively simplified split type terminal box, and the total number of the welding spots is 150, wherein 6 are welding spots of bus bar outgoing lines, as shown in fig. 4. Moreover, after changing from 3-grid to 12-grid, the solder joint distance between the adjacent interconnector and the bus bar is shortened, and thermal interference can occur in the process of soldering; meanwhile, the cross section of the interconnector of the multi-main grid is a circular welding strip, the welding difficulty is further increased, the welding efficiency is reduced, and the efficiency of the flow-converging welding is reduced to about 1/5-1/6. Therefore, for the popularization of the multi-main grid technology, the confluence welding can become a great bottleneck in the whole assembly process.
Therefore, a welding method for the solar cell needs to be designed, so that the number of welding points of the solar cell in the welding process is reduced, the production efficiency is improved, and the production cost is reduced.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a solder strip connecting method of a solar cell, which effectively reduces the number of welding spots and reduces the production cost.
Therefore, the invention adopts the following technical scheme:
a solder strip connection method of a solar cell is characterized in that: and welding fixed-length bus bars at the head end and/or the tail end of the single-string battery string, and then welding the single-string battery string with the fixed-length bus bars at the head end and/or the tail end to form the battery piece group string of the photovoltaic module.
Further, when the battery plates are welded in series, fixed-length bus bars are welded at the head end and/or the tail end of the single-string battery string.
Further, after the series welding of the battery plates is completed, fixed-length bus bars are welded at the head end and/or the tail end of the single-string battery string.
Specifically, the solder strip connection method for the solar cell comprises the following steps:
s1: placing a first bus bar with a fixed length on a preheating area of a transmission/welding platform of a series welding device, and placing a plurality of first interconnection bar welding strips on the first bus bar, wherein the number of the first interconnection bar welding strips is consistent with that of main grid electrodes of a battery piece, and the welding strip clamp grabs the first interconnection bar welding strips; or the welding strip clamp grabs a plurality of first interconnection strip welding strips with the number being consistent with that of the main grid electrodes of the battery pieces and places the first interconnection strip welding strips on a preheating area of a transmission/welding platform of the series welding device, and the first bus bars with fixed lengths are placed on the tops of the first interconnection strip welding strips;
s2: the manipulator picks up a first battery and places the first battery on a first interconnecting strip welding strip below the first bus bar, and each main gate electrode of the battery corresponds to the first interconnecting strip welding strip respectively;
s3: placing a plurality of second interconnecting strip welding strips with the number consistent with that of the main grid electrodes of the battery piece on the upper surface of the battery piece; one end of the second interconnector solder strip is positioned above one battery piece, and the other end of the second interconnector solder strip is positioned below the next battery piece to form the first interconnector solder strip, so that the series connection of the front battery piece and the rear battery piece is realized;
s4: connecting the first bus bar with the first interconnector solder ribbon through a heating element active region of the stringer; in a welding area of the series welding machine, welding of the first bus bar and the interconnector welding strip and welding of the interconnector welding strip and the battery piece are achieved;
s5: repeating the steps S2-S4 until the tail cells of the same row of cells are obtained, wherein the second interconnector solder strip of the previous cell forms a first interconnector solder strip of the tail cell, the tail cells are placed on the first interconnector solder strip, the second bus bar is placed at the tail ends of the tail cells, then a plurality of second interconnector solder strips with the number being consistent with that of the main grid electrodes of the cells are placed on the upper surfaces of the tail cells, welding of the second bus bars and the interconnector solder strips is achieved in a welding area of a series welding machine, and welding of the interconnector solder strips and the cells is achieved;
s6: and (5) welding fixed-length bus bars at the head end and the tail end of the single-string battery string formed after the step S5, placing the single-string battery string on the adhesive clamping film according to the designed interval of the assembly, and lap-welding the battery strings by using the bus bar welding strip under the action of an electric iron to form a battery piece assembly string of the photovoltaic assembly.
Further, in step S1, the lower surface of the first bus bar contacts the bottom plate having the heating function.
Further, in step S3, the battery piece is pressed against the interconnector solder ribbon located therebelow by a vacuum adsorption device on the stringer transfer/soldering station.
Further, in steps S1 and S5, the first bus bar, the second bus bar, and the first interconnect bar and the second interconnect bar are fixed on the platform by a vacuum suction device or a mechanical fixing means on the serial welding device transmission/welding platform.
Further, the minimum length of the first bus bar and the second bus bar is L1 of the center distance between two outermost main grid lines of a standard cell in the assembly, the maximum length of the first bus bar and the second bus bar is L1+2 xL 2, the first bus bar and the second bus bar are placed symmetrically on two sides of the center line of the cell in the width direction, and L2 is the center distance between two nearest main grid lines of two adjacent standard cells in the assembly.
Furthermore, a pressing device is arranged at the upper part of the welding area, and the pressing device presses the bus bar and the interconnector welding strip, and the interconnector welding strip and the battery piece; after that, heating is carried out by the heating element, then the heating element is cooled, and when the temperature of the welding spot is reduced to be lower than the melting point of the tinned coating of the bus bar, the pressing device is lifted, so that the battery string is continuously conveyed forwards.
Further, after the battery pieces are serially connected into a single battery string through a traditional serial welding process, an on-line or off-line automatic welding device is adopted to weld the interconnectors at the head end and/or the tail end of the battery string with the fixed-length bus bars; after the end bus bar is welded, carrying out overlapping and arranging on each battery string and carrying out lap welding on the end of the bus bar; a string of cell groups of a photovoltaic module is formed. As a specific embodiment, the fixed-length bus bars are welded at the head end and/or the tail end of the single-string battery string at the same time of the series welding of the battery sheets.
The invention has the following beneficial effects:
the invention overcomes the defects of more welding points and high manufacturing cost in the converging welding process of the solar cell module, and can effectively reduce the traditional lamination welding workload of three-to five-main-grid modules by 60-80%, and reduce the converging welding workload of a plurality of main-grid modules by more than 90%, thereby greatly reducing the manufacturing cost.
Drawings
FIG. 1 is a conventional single string of cells of a triple main gate battery;
FIG. 2 is a schematic view of a conventional stack welding of a tri-primary grid cell assembly;
FIG. 3 is a conventional battery cell string of a multiple main gate battery;
FIG. 4 is a schematic view of a conventional stack soldering of a multiple main gate battery assembly;
FIG. 5 is a battery cell string of a multiple main gate battery of the present invention;
FIG. 6 is a schematic view of a stack of a multiple main gate battery assembly of the present invention; the positions of the newly added and bus bar welding points are marked by dots;
in the figure, 1 is a three-main grid cell; 2 is a first/second interconnector solder strip; 3 is a first bus bar solder strip; 4, a component lead-out wire welding strip; 5, adding a welding point between the first interconnecting bar and the first bus bar; 6 is a welding spot of the first bus bar and the outgoing line; 7 is a multi-main grid battery; and 8 is a lap welding point of the adjacent single-string pre-welding bus bar.
Detailed Description
The invention is further described in detail below with reference to the figures and the specific embodiments.
Example 1:
as shown in fig. 5 and 6, a multi-main-grid battery 7 having 12 main grids is taken as a series welding object, and a conventional infrared-heated series welding machine is taken as an example of a series welding device.
In the invention, a bus bar positioned at the top end of the first battery in a series of battery pieces is defined as a first bus bar; defining a second bus bar by the bus bar positioned at the bottom end of the tail piece battery in the string of battery pieces, wherein the first bus bar and the second bus bar are collectively called bus bars; the method comprises the following steps of defining an interconnector solder strip positioned on the back surface of a cell piece as a first interconnector solder strip, defining an interconnector solder strip positioned on the front surface (light receiving surface) of the cell piece as a second interconnector solder strip, wherein the first interconnector solder strip and the second interconnector solder strip are collectively called interconnector solder strips; and defining the set of all the cells which are orderly arranged and form a photovoltaic module as a cell group string of the photovoltaic module. The above definitions are for convenience of description only and do not limit the structure thereof.
The solder strip connection method of the solar cell of the embodiment comprises the following steps:
s1: placing a first bus bar 3 with a fixed length on a preheating area of a transmission/welding platform of a series welding device, and placing a plurality of first interconnection bar welding strips 2, the number of which is consistent with that of main grid electrodes of the battery pieces, on the first bus bar by a welding strip clamp;
the minimum length of the first bus bar and the second bus bar is L1 of the center distance between two outermost main grid lines of the standard battery piece in the assembly, and the maximum length of the first bus bar and the second bus bar is L1+2 xL 2; the first bus bars are symmetrically arranged on two sides of the center line of the battery piece in the width direction; the arrangement can ensure that the subsequent lamination has enough lapping length when in confluence and the lapping length of each row of battery strings is approximately equal; the lower surface of the first bus bar 3 contacts the bottom plate having a heating function; ensuring the subsequent welding heat;
s2: the manipulator picks up a first battery and places the first battery on a first interconnector solder strip 2 below a first bus bar 3, each main gate electrode of the battery corresponds to the first interconnector solder strip respectively, and in the embodiment, the number of the first interconnector solder strips 2 is 12;
s3: placing a plurality of second interconnecting strip welding strips 2 with the number consistent with that of the main grid electrodes of the battery piece on the upper surface of the battery piece; one end of the second interconnector solder strip is positioned above one battery piece, and the other end of the second interconnector solder strip is positioned below the next battery piece to form the first interconnector solder strip, so that the series connection of the front battery piece and the rear battery piece is realized;
s4: connecting the first bus bar with the first interconnector solder ribbon through a heating element active region of the stringer; in a welding area of the series welding machine, welding of the first bus bar and the interconnector welding strip and welding of the interconnector welding strip and the battery piece are achieved;
s5: repeating the steps S2-S4 until the tail cells of the same row of cells are obtained, wherein the second interconnector solder strip of the previous cell forms a first interconnector solder strip of the tail cell, the tail cells are placed on the first interconnector solder strip, the second bus bar is placed at the tail ends of the tail cells, then a plurality of second interconnector solder strips with the number being consistent with that of the main grid electrodes of the cells are placed on the upper surfaces of the tail cells, welding of the second bus bars and the interconnector solder strips is achieved in a welding area of a series welding machine, and welding of the interconnector solder strips and the cells is achieved;
s6: and (5) welding fixed-length bus bars at the head end and the tail end of the single-string battery string formed after the step S5, placing the single-string battery string on the adhesive clamping film according to the designed interval of the assembly, and lap-welding the battery strings by using the bus bar welding strip under the action of an electric iron to form a battery piece assembly string of the photovoltaic assembly.
By adopting the solder strip connection method of the solar cell, the number of the lap welding points 8 is only 5 in the whole 6-string 12-main-grid cell assembly, and the number of the leading-out wires and the 6 connecting points for welding the bus bar solder strip is only 11 in the lamination process, compared with the conventional welding mode shown in figure 4, the number of the welding points is 144 and the number of the leading-out welding points is 150, the number of the lamination welding points is reduced by 92.7%, the production efficiency is improved by 95% approximately, and the manufacturing cost is greatly reduced. If the length of the fixed-length bus bar welded at the end of the single string is close to the width of the battery piece, the auxiliary lap-joint welded short bus bar needs to be introduced, the length of the auxiliary lap-joint short bus bar is 1-3 times of the distance between adjacent battery piece strings, the number of welding points at the lap-joint position is changed from 5 to 10, and the number of total welding points is changed into 16, so that the production efficiency of the lamination welding process is improved by 89%.
Example 2:
the present embodiment is different from embodiment 1 in that: the solder strip connection method of the solar cell is used for common three-main-grid, four-main-grid and five-main-grid components, and the steps are the same as those of the embodiment 1.
After the invention is used, in the welding process of the three-main grid, four-main grid and five-main grid assembly, the total welding points of the most common 6 strings of battery lamination welding are respectively reduced from 42, 54 and 66 to 11. The production efficiency of the lamination welding process is improved by about 70-80%. If the third bus bar for assisting lap welding is introduced, the number of welding points at the lap position is changed from 5 to 10, and the number of total welding points is changed to 16, so that the production efficiency of the lamination welding process is improved by about 60-75%.
Example 3:
the present embodiment is different from embodiment 1 in that: in step S1, first, the solder ribbon clamp grasps a number of interconnect solder ribbons in accordance with the number of main gate electrodes of the cell pieces to be placed on the preheating region of the transfer/soldering stage of the series soldering apparatus, and then, the first bus bar of a fixed length is placed on top of the interconnect solder ribbons. The rest of the procedure was the same as in example 1.
Example 4:
the difference between the non-embodiments and embodiment 1 is that:
after the battery plates are welded into a single battery string by adopting a traditional series welding method, an on-line or off-line automatic welding device is adopted to weld the interconnectors at the head end and/or the tail end of the battery string with the fixed-length bus bars; after the end bus bar is welded, carrying out overlapping and arranging on each battery string and carrying out lap welding on the end of the bus bar; a string of cell groups of a photovoltaic module is formed.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A solder strip connection method of a solar cell is characterized in that: welding fixed-length bus bars at the head ends and/or the tail ends of the single-string battery strings, and then welding the single-string battery strings with the fixed-length bus bars at the head ends and/or the tail ends to form a battery piece group string of the photovoltaic module, wherein the minimum length of the bus bars is the center distance L1 between two outermost main grid lines of a standard battery piece in the module, the maximum length of the bus bars is L1+2 xL 2, and the bus bars are symmetrically arranged on two sides of the center line of the battery piece in the width direction; the method comprises the following steps:
s1: placing a first bus bar with a fixed length on a preheating area of a transmission/welding platform of a series welding device, and placing a plurality of first interconnection bar welding strips on the first bus bar, wherein the number of the first interconnection bar welding strips is consistent with that of main grid electrodes of a battery piece, and the welding strip clamp grabs the first interconnection bar welding strips; or the welding strip clamp grabs a plurality of first interconnection strip welding strips with the number being consistent with that of the main grid electrodes of the battery pieces and places the first interconnection strip welding strips on a preheating area of a transmission/welding platform of the series welding device, and the first bus bars with fixed lengths are placed on the tops of the first interconnection strip welding strips;
s2: the manipulator picks up a first battery and places the first battery on a first interconnecting strip welding strip below the first bus bar, and each main gate electrode of the battery corresponds to the first interconnecting strip welding strip respectively;
s3: placing a plurality of second interconnecting strip welding strips with the number consistent with that of the main grid electrodes of the battery piece on the upper surface of the battery piece; one end of the second interconnector solder strip is positioned above one battery piece, and the other end of the second interconnector solder strip is positioned below the next battery piece to form the first interconnector solder strip, so that the series connection of the front battery piece and the rear battery piece is realized;
s4: connecting the first bus bar with the first interconnector solder ribbon through a heating element active region of the stringer; in a welding area of the series welding machine, welding of the first bus bar and the interconnector welding strip and welding of the interconnector welding strip and the battery piece are achieved;
s5: repeating the steps S2-S4 until the tail cells of the same row of cells are obtained, wherein the second interconnector solder strip of the previous cell forms a first interconnector solder strip of the tail cell, the tail cells are placed on the first interconnector solder strip, the second bus bar is placed at the tail ends of the tail cells, then a plurality of second interconnector solder strips with the number being consistent with that of the main grid electrodes of the cells are placed on the upper surfaces of the tail cells, welding of the second bus bars and the interconnector solder strips is achieved in a welding area of a series welding machine, and welding of the interconnector solder strips and the cells is achieved;
s6: and (5) welding fixed-length bus bars at the head end and the tail end of the single-string battery string formed after the step S5, placing the single-string battery string on the adhesive clamping film according to the designed interval of the assembly, and lap-welding the battery strings by using the bus bar welding strip under the action of an electric iron to form a battery piece assembly string of the photovoltaic assembly.
2. The solder ribbon connection method for a solar cell according to claim 1, characterized in that: and welding fixed-length bus bars at the head end and/or the tail end of the single-string battery string while welding the battery piece strings.
3. The solder ribbon connection method for a solar cell according to claim 1, characterized in that: and after the series welding of the battery plates is completed, welding fixed-length bus bars at the head end and/or the tail end of the single-series battery string.
4. The solder ribbon connection method for a solar cell according to claim 1, characterized in that: in step S1, the lower surface of the first bus bar contacts the bottom plate having the heating function.
5. The solder ribbon connection method for a solar cell according to claim 1, characterized in that: in step S3, the battery piece is pressed against the interconnector solder ribbon located therebelow by a vacuum chuck on the serial welding device transfer/welding platform.
6. The solder ribbon connection method for a solar cell according to claim 1, characterized in that: the minimum length of the first bus bar and the second bus bar is L1 of the center distance between two outermost main grid lines of a standard battery piece in the assembly, the maximum length of the first bus bar and the second bus bar is L1+2 xL 2, and the first bus bar and the second bus bar are symmetrically arranged on two sides of the center line of the battery piece in the width direction.
7. The solder ribbon connection method for a solar cell according to claim 1, characterized in that: a pressing device is arranged at the upper part of the welding area and compresses the bus bar and the interconnector welding strip, the interconnector welding strip and the battery piece; after that, heating is carried out by the heating element, then the heating element is cooled, and when the temperature of the welding spot is reduced to be lower than the melting point of the tinned coating of the bus bar, the pressing device is lifted, so that the battery string is continuously conveyed forwards.
8. The solder ribbon connection method for a solar cell according to claim 3, wherein: after the battery plates are serially connected into a single battery string through the traditional series welding process, an on-line or off-line automatic welding device is adopted to weld the interconnectors at the head end and/or the tail end of the battery string with the fixed-length bus bars; after the end bus bars are welded, carrying out overlapping welding on the battery strings and the ends of the bus bars, and when the length of the bus bars welded at the ends is smaller, carrying out overlapping welding on the ends of the adjacent fixed-length bus bars and the third bus bars between the bus bars on the same side of the adjacent single strings respectively; a string of cell groups of a photovoltaic module is formed.
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| CN108687418A (en) | 2018-10-23 |
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Effective date of registration: 20230627 Address after: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu Patentee after: TRINA SOLAR Co.,Ltd. Patentee after: TRINA SOLAR( CHANGZHOU) TECHNOLOGY Co.,Ltd. Address before: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu Patentee before: TRINA SOLAR Co.,Ltd. |