CN106558631B - Main-grid-free double-sided battery assembly and manufacturing process thereof - Google Patents
Main-grid-free double-sided battery assembly and manufacturing process thereof Download PDFInfo
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- CN106558631B CN106558631B CN201510598209.7A CN201510598209A CN106558631B CN 106558631 B CN106558631 B CN 106558631B CN 201510598209 A CN201510598209 A CN 201510598209A CN 106558631 B CN106558631 B CN 106558631B
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- battery
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- sided
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- 238000004519 manufacturing process Methods 0.000 title claims description 10
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000002184 metal Substances 0.000 claims abstract description 24
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000011521 glass Substances 0.000 claims abstract description 21
- 238000003475 lamination Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000010030 laminating Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 239000002313 adhesive film Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 abstract description 15
- 239000005038 ethylene vinyl acetate Substances 0.000 abstract description 15
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 abstract description 15
- 238000003466 welding Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 229910052709 silver Inorganic materials 0.000 abstract description 2
- 239000004332 silver Substances 0.000 abstract description 2
- 239000012528 membrane Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
Images
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
- H01L31/048—Encapsulation of modules
- H01L31/0488—Double glass encapsulation, e.g. photovoltaic cells arranged between front and rear glass sheets
-
- 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
- H01L31/0512—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 made of a particular material or composition of materials
-
- 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
-
- 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
-
- 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
A double-sided battery assembly without a main grid comprises front toughened coated glass, a front EVA (ethylene vinyl acetate) film, a double-sided battery piece array without the main grid, a back EVA film and back toughened coated glass which are sequentially stacked. The non-main-grid double-sided battery piece array comprises a plurality of non-main-grid double-sided battery pieces and a plurality of copper-tin metal wire films, wherein each copper-tin metal wire film is connected with two battery pieces to form a battery string, and the plurality of battery strings are connected in series in parallel to form the non-main-grid double-sided battery piece array. According to the invention, the copper-tin metal wire is adopted to replace a main grid of the battery piece and copper-tin welding to collect current, so that the use amount of silver paste is saved, and the problems of hidden cracking and splitting caused by high-temperature welding are reduced. Because the quantity of copper tin wire compares the main grid line is several times more, can collect the electric current of each position of battery piece uniformly, improved the short-circuit current of battery piece to the conversion efficiency of battery piece and subassembly has been promoted.
Description
Technical Field
The invention relates to a solar cell, in particular to a double-sided cell module without a main grid and a manufacturing process thereof.
Background
The double-sided battery can receive light on two sides, the front side can output electric power, the back side can also convert the reflected or irradiated solar energy into electric energy, the conversion efficiency is greatly improved compared with that of the traditional single crystal or polycrystalline battery piece, the front side can realize 19.8% of power generation efficiency, and the back side can realize 19.2% of power generation efficiency. Meanwhile, the mode of the traditional assembly can be changed by adopting the double-sided battery piece, and the vertical installation can obtain higher efficiency output than the inclined installation. However, due to the complex preparation process of the double-sided battery, the battery piece is relatively weak through multiple processes, and therefore, the hidden crack is easy to occur when the conventional high-temperature welding method is adopted; in addition, because the short-circuit current of the double-sided battery piece is large, the power loss of the battery after being packaged by adopting a conventional packaging process is also large, and the development of the application of the double-sided battery is slow due to the reasons, so that the method for reducing the hidden crack and the packaging power loss of the battery piece is particularly important.
Disclosure of Invention
The invention aims to solve the problems and provides a double-sided battery component without a main grid and a manufacturing process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme: a double-sided battery assembly without a main grid comprises front toughened coated glass, a front EVA (ethylene vinyl acetate) film, a double-sided battery piece array without the main grid, a back EVA film and back toughened coated glass which are sequentially stacked.
The double-sided battery piece array without the main grid comprises a plurality of double-sided battery pieces without the main grid and a plurality of copper-tin metal wire films, wherein each copper-tin metal wire film is connected with two battery pieces, namely the first copper-tin metal wire film is connected with the front side of the first battery piece and the back side of the second battery piece, the second copper-tin metal wire film is connected with the front side of the second battery piece and the back side of the third battery piece, and by analogy, a battery string is formed, the two ends of the battery string form the positive and negative poles of the battery string through bus bars, and then a plurality of battery strings are connected in series to form the double-sided battery piece array without the main grid.
The copper-tin metal wire film is formed by bonding a plurality of copper-tin metal wires on a thermoplastic adhesive film at uniform intervals.
The wire diameter of the copper-tin metal wires is 100 micrometers, and the number of the copper-tin metal wires is 30-60.
The manufacturing process of the double-sided battery component without the main grid comprises the following steps:
firstly, selecting a plurality of double-sided battery pieces with the front efficiency and the working current of the battery pieces at the same gear;
secondly, connecting a plurality of double-sided battery pieces in series to form an array through a copper-tin wire film, namely connecting the front of a first battery piece and the back of a second battery piece with the first copper-tin wire film, connecting the front of the second battery piece and the back of a third battery piece with the second copper-tin wire film, so as to form a battery string, forming the positive and negative poles of the battery string through bus bars at the two ends of the battery string, and connecting a plurality of battery strings in series to form a double-sided battery piece array without a main grid;
thirdly, paving front toughened coated glass, enabling the coated surface to face downwards, paving a front EVA film on the glass, connecting a plurality of double-sided battery pieces in series according to the second step through a copper-tin wire film to form a main-grid-free double-sided battery piece array, placing a back EVA film on the main-grid-free double-sided battery piece array, placing back toughened coated glass on the back EVA film, and enabling the coated surface to face upwards to complete the lamination of each component;
fourthly, performing EL test on the laminated piece obtained in the third step, detecting the internal defects of the assembly, and laminating the qualified laminated piece in a laminating machine, wherein the laminating temperature is controlled to be 145-450 ℃, and the laminating time is 18-22 min;
fifthly, after lamination, cooling the temperature to room temperature, and then connecting a junction box and filling glue; after the glue is solidified, sealing the periphery of the assembly by using an adhesive tape; and finally, testing the electrical properties of the front surface and the back surface of the assembly, and grading and delivering according to the power and current values of the front surface of the assembly.
The thickness of the front toughened coated glass and the back toughened coated glass is 2 mm.
The thickness of the front EVA film and the back EVA film is 0.45 mm.
Compared with the prior art, the technical scheme of the invention has the following two main advantages:
1. the copper-tin metal wire is adopted to replace a main grid of the battery piece and copper-tin welding is adopted to collect current, so that the use amount of silver paste is saved, and the problems of hidden cracking and splitting caused by high-temperature welding are reduced.
2. Because the quantity of copper tin wire compares main grid line is more than several times, can collect the electric current of each position of battery piece uniformly, improved the short-circuit current of battery piece to the conversion efficiency of battery piece and subassembly has been promoted.
Drawings
Fig. 1 is a schematic front view of a double-sided battery module without a main grid according to the present invention.
Fig. 2 is a partial structural schematic diagram of the double-sided battery assembly without the main grid.
Fig. 3 is a partial structural view of a battery string in the present invention.
Fig. 4 is a schematic structural diagram of a double-sided cell without a main grid in the invention.
Fig. 5 is a schematic structural view of a copper-tin wire film in the present invention.
Detailed Description
Referring to fig. 1, and referring to fig. 2, fig. 3, fig. 4, and fig. 5 in a matching manner, the double-sided battery assembly without the main grid of the present invention includes a front-side toughened coated glass 1, a front-side EVA film 2, a double-sided battery array without the main grid 3, a back-side EVA film 4, and a back-side toughened coated glass 5, which are sequentially stacked.
The double-sided battery piece array 3 without the main grid comprises a plurality of double-sided battery pieces 31 without the main grid and a plurality of copper-tin metal wire films 32, wherein two sides of each double-sided battery piece 31 without the main grid are not provided with the main grid lines, only the thin grid lines 311 are arranged, and the number of the front-side thin grid lines and the number of the back-side thin grid lines are respectively 80 and 75. Every copper tin wire membrane connects two battery pieces, and first copper tin wire membrane connects the front of first battery piece and the back of second battery piece promptly, and the front of second battery piece and the back of third battery piece are connected to second copper tin wire membrane, analogizes with this, forms a battery cluster, and the both ends of battery cluster form the positive and negative poles of battery cluster through busbar 33, establish ties a plurality of battery clusters again, form no main grid two-sided battery piece array.
The copper-tin wire film 32 is formed by bonding a plurality of copper-tin wires 321 to a thermoplastic film 322 at regular intervals. The wire diameter of the copper-tin metal wires is 100 microns, and the number of the copper-tin metal wires is 30-60.
The following is one example of a process for making a double-sided battery assembly without a main grid:
the 60 double-sided battery pieces shown in fig. 4 are adopted, the battery pieces are sorted according to the front efficiency and the working current, and the 60 battery pieces are ensured to be at the same gear.
As shown in fig. 3, the series connection between the battery plates 31 is through the cu-sn wire film 32, and one cu-sn wire film can connect two battery plates, i.e. connect the front of the first battery plate and the back of the second battery plate; then connecting the front side of the second battery piece and the back side of the third battery piece with another copper-tin metal wire film; and so on to form the battery string shown in fig. 3. Two ends of the battery string form the positive and negative poles of the battery string through the bus bars 33, and then are connected with other strings of batteries, and finally 60 batteries are connected in series. The process omits the technical process of welding the welding strip of the common assembly, and the hidden crack of the battery can be effectively reduced.
The connection of the above battery strings needs to be performed during lamination: before lamination, firstly, toughened coated glass with the thickness of 2mm is laid, the coated surface faces downwards, and then a transparent EVA film with the thickness of 0.45mm is laid on the glass; then the metal wire film and the battery pieces are sequentially placed according to the steps, wherein 10 battery pieces are 1 string, and 6 strings of battery strings are connected by a bus bar in total, and a lead-out wire is reserved to be connected with a junction box in the subsequent process; and placing an EVA film and toughened coated glass with the thickness of 2mm on the connected battery strings to complete the laminated piece of the double-sided assembly (as shown in figures 1 and 2).
The detailed structure of the laminated piece of the double-sided assembly is shown in fig. 2, and the thin grid lines of the double-sided battery piece are vertically connected with the copper-tin metal wires and are laminated in two groups of packaging panels.
The above laminate was subjected to EL testing to detect internal defects of the assembly. And (3) placing the qualified lamination into a laminator for lamination, wherein the lamination temperature is 148 ℃, and the lamination process time is 20 min. In addition to the function of packaging and bonding the battery piece, the lamination process can also enable the copper-tin metal wires to form good ohmic contact with the thin grid lines of the battery piece at the temperature, and the copper-tin metal wires are beneficial to collecting the current generated by the battery piece.
After lamination, the temperature of the lamination part is required to be reduced, and junction box connection and glue filling are carried out; after the glue is solidified, sealing the periphery of the assembly by using an adhesive tape; and finally, testing the electrical properties of the front surface and the back surface of the assembly, and grading and delivering according to the power and current values of the front surface of the assembly.
Claims (5)
1. A manufacturing process of a double-sided battery component without a main grid is characterized by comprising the following steps: the non-main-grid double-sided battery assembly comprises front toughened coated glass, a front EVA film, a non-main-grid double-sided battery piece array, a back EVA film and back toughened coated glass which are sequentially stacked;
the specific preparation process comprises the following steps:
firstly, selecting a plurality of double-sided battery pieces with the front efficiency and the working current of the battery pieces at the same gear;
secondly, connecting a plurality of double-sided battery pieces in series to form an array through a copper-tin wire film, namely connecting the front of a first battery piece and the back of a second battery piece with the first copper-tin wire film, connecting the front of the second battery piece and the back of a third battery piece with the second copper-tin wire film, so as to form a battery string, forming the positive and negative poles of the battery string through bus bars at the two ends of the battery string, and connecting a plurality of battery strings in series to form a double-sided battery piece array without a main grid;
thirdly, paving front toughened coated glass, enabling the coated surface to face downwards, paving a front EVA film on the glass, connecting a plurality of double-sided battery pieces in series according to the second step through a copper-tin wire film to form a main-grid-free double-sided battery piece array, placing a back EVA film on the main-grid-free double-sided battery piece array, placing back toughened coated glass on the back EVA film, and enabling the coated surface to face upwards to complete the lamination of each component;
fourthly, performing EL test on the laminated piece obtained in the third step, detecting the internal defects of the assembly, and laminating the qualified laminated piece in a laminating machine, wherein the laminating temperature is controlled to be 145-450 ℃, and the laminating time is 18-22 min;
fifthly, after lamination, cooling the temperature to room temperature, and then connecting a junction box and filling glue; after the glue is solidified, sealing the periphery of the assembly by using an adhesive tape; and finally, testing the electrical properties of the front surface and the back surface of the assembly, and grading and delivering according to the power and current values of the front surface of the assembly.
2. The process for manufacturing a double-sided battery pack without a main grid according to claim 1, wherein: the copper-tin metal wire film is formed by bonding a plurality of copper-tin metal wires on a thermoplastic adhesive film at uniform intervals.
3. The process for manufacturing a bifacial battery pack without a main grid according to claim 2, wherein: the wire diameter of the copper-tin metal wires is 100 micrometers, and the number of the copper-tin metal wires is 30-60.
4. The process for manufacturing a double-sided battery assembly without a main grid according to claim 1, wherein the thicknesses of the front-side toughened coated glass and the back-side toughened coated glass are 2 mm.
5. The process for manufacturing a double-sided battery module without a main grid according to claim 1, wherein the thickness of the front EVA film and the back EVA film is 0.45 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510598209.7A CN106558631B (en) | 2015-09-18 | 2015-09-18 | Main-grid-free double-sided battery assembly and manufacturing process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510598209.7A CN106558631B (en) | 2015-09-18 | 2015-09-18 | Main-grid-free double-sided battery assembly and manufacturing process thereof |
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| Publication Number | Publication Date |
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| CN106558631A CN106558631A (en) | 2017-04-05 |
| CN106558631B true CN106558631B (en) | 2020-05-12 |
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| CN110634987A (en) * | 2019-08-05 | 2019-12-31 | 湖北工业大学 | Multi-main-grid welding and automatic packaging method for efficient solar cell |
| CN113013297B (en) * | 2021-03-08 | 2022-12-09 | 无锡市联鹏新能源装备有限公司 | Preparation method of grid-line-free heterojunction battery assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10239845C1 (en) * | 2002-08-29 | 2003-12-24 | Day4 Energy Inc | Electrode for photovoltaic cells, photovoltaic cell and photovoltaic module |
| WO2009076740A1 (en) * | 2007-12-18 | 2009-06-25 | Day4 Energy Inc. | Photovoltaic module with edge access to pv strings, interconnection method, apparatus, and system |
| CN202004010U (en) * | 2011-03-10 | 2011-10-05 | 阿特斯(中国)投资有限公司 | Solar cell assembly |
| CN103022201A (en) * | 2011-09-27 | 2013-04-03 | 杜邦公司 | Crystal silicon solar battery module and manufacturing method thereof |
| CN103618011A (en) * | 2013-11-19 | 2014-03-05 | 奥特斯维能源（太仓）有限公司 | Non-main-grid double-faced battery pack connected with conductive adhesives |
| CN104347746A (en) * | 2014-09-28 | 2015-02-11 | 苏州中来光伏新材股份有限公司 | Main-grid-free high-efficiency back contact solar battery module, main-grid-free high-efficiency back contact solar battery assembly and preparation process |
| CN204558491U (en) * | 2015-01-29 | 2015-08-12 | 信阳师范学院 | A kind of photovoltaic battery module |
| CN205177858U (en) * | 2015-09-18 | 2016-04-20 | 上海太阳能工程技术研究中心有限公司 | Two -sided battery pack of no main grid |
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