CN214123893U - Metal alloy series-connected laminated photovoltaic module battery string - Google Patents
Metal alloy series-connected laminated photovoltaic module battery string Download PDFInfo
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- CN214123893U CN214123893U CN202120462327.6U CN202120462327U CN214123893U CN 214123893 U CN214123893 U CN 214123893U CN 202120462327 U CN202120462327 U CN 202120462327U CN 214123893 U CN214123893 U CN 214123893U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to a metal alloy series-connected laminated photovoltaic module battery string, which is provided with a plurality of battery pieces; the front side of each battery piece is provided with a front electrode, and the back side of each battery piece is provided with a back electrode; the front side electrodes comprise front side fine grid electrodes, front side main grid electrodes and front side main grid electrodes, wherein the front side fine grid electrodes are connected with the front side main grid electrodes, and the front side main grid electrodes are connected with the front side main grid electrodes; the front-side main gate electrode of the previous cell and the back-side electrode portion of the next cell are stacked and joined together at the stack by a molten post-solidified metal alloy and form a series connection. The utility model discloses replace traditional conducting resin with metal alloy, can effectively solve long-term operation and lead to the problem of ageing and resistance increase, can also have simultaneously effectively to solve the problem that causes catching fire because of resistance generates heat.
Description
Technical Field
The utility model relates to a photovoltaic module, in particular to stack tile photovoltaic module battery cluster of metal alloy series connection hookup.
Background
The shingled photovoltaic module responds to the market demand for products with high output power density, the unique structural arrangement is adopted to fully utilize the gaps among the series-connected battery pieces, the 6% output power gain of a single photovoltaic module can be realized, under the condition that the photovoltaic crystal silicon raw material, the battery process and the module packaging process technology are gradually 'technical ceilings', the 6% output power gain is the same as a technical progress, the process improvement does not need complicated battery structural design and large-scale equipment introduction, and the process can be realized only by slightly improving the technology at the traditional battery process end.
In addition, since the conventional laminated assembly products are introduced into the market, the failure rate of the photovoltaic assembly in case of fire is higher than that of the conventional photovoltaic assembly, and the reason for the failure is analyzed to be that the conventional laminated assembly realizes the series connection of the cells by dispensing (mainly conductive adhesive) on the main gate electrode at the side of the cell, and the dispensed adhesive solution covers the main gate electrode of the adjacent cell if not uniform or incomplete, or because the main component of the conductive adhesive is high molecular polymer. The thermal oxidation and the time aging of the conductive adhesive are main reasons of the failure of the laminated tile assembly, and the conductive adhesive system inevitably has the phenomenon that the resistivity is continuously increased along with the aging, namely, the laminated tile assembly connected in series by adopting the conductive adhesive system can continuously increase the series connection resistance of adjacent cells (or cell strips) along with the extension of the operation time of the photovoltaic assembly, so that the integral resistivity of the conductive adhesive is greatly improved. The photo-generated charges generated by the solar cell are concentrated on the conductive adhesive part with large volume resistivity, so that the resistance is heated, the local temperature rise of the photovoltaic module is further aggravated, and the failure phenomenon of fire accident can occur difficultly.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a shingled photovoltaic module battery cluster of metal alloy series connection hookup, it realizes series connection through metal alloy, can effectively solve long-term operation and lead to ageing and the problem that resistance increases, can also have the problem of effectively solving and causing the problem of catching fire because of resistance generates heat simultaneously.
Realize the utility model discloses the technical scheme of purpose is: the utility model discloses a laminated tile photovoltaic module battery string connected in series by metal alloy, which is provided with a plurality of battery pieces; the front side of each battery piece is provided with a front electrode, and the back side of each battery piece is provided with a back electrode; the front side electrodes comprise front side fine grid electrodes, front side main grid electrodes and front side main grid electrodes, wherein the front side fine grid electrodes are connected with the front side main grid electrodes, and the front side main grid electrodes are connected with the front side main grid electrodes; the front-side main gate electrode of the previous cell and the back-side electrode portion of the next cell are stacked and joined together at the stack by a molten post-solidified metal alloy and form a series connection.
The back electrode includes a back main gate electrode and a back electric field.
As a further optimization design, the back electrode further comprises a back side main gate electrode, and the back side main gate electrode is connected with the back side main gate electrode; the front-side main gate electrode of the upper cell piece and the back-side main gate electrode of the lower cell piece are partially stacked and joined together at the stack by a molten post-solidified metal alloy and form a series connection.
The metal alloy is a silicon-based alloy.
Preferably, the metal alloy is Ag-Si alloy or Al-Si alloy or Ag-Al-Si alloy.
The metal alloy is formed by solidifying the front-side main gate electrode and the back-side main gate electrode melted at the stacking position.
The back of the battery piece is also provided with a passivation layer. The passivation layer is a laminated passivation layer of Al2O3 and SiNx or a SiNx single-layer passivation layer or a laminated passivation layer of SiO2 and SiNx or a multi-layer passivation layer of SiO2, Al2O3 and SiNx.
The utility model discloses in prepare on the preparation method of the shingled photovoltaic module battery of metal alloy series connection hookup, including following step:
s1, printing a back main grid electrode on the back of the battery piece;
s2, drying the paste printed on the back main grid electrode
S3, printing a back electric field on the back surface of the battery piece;
s4, drying the paste printed by the back electric field;
s5, printing a front fine grid electrode and a front main grid electrode on the front surface of the battery piece; the width of the front main grid electrode is matched with the width of a metal probe selected for test sorting, or a thinner metal probe is replaced to match with the width of the front main grid electrode;
s6, drying the paste printed on the front fine grid electrode and the front main grid electrode;
s7, testing and sorting: deleting the battery pieces with the voltages and the currents meeting the requirements; the stepping is mainly carried out according to Impp (maximum power point current), so that the subsequent battery pieces are conveniently connected in series;
s8, screen printing a main grid electrode on the front side of the battery piece;
s9, drying the paste printed on the main grid electrode on the front side;
s10, gluing or screen printing a layer of glue solution or a layer of adhesive tape on the main gate electrode on the front side of the stacking position to realize the gluing series connection of adjacent battery pieces;
s11, high-temperature sintering: sintering the printing slurry at the stacking position of the adjacent battery plates at high temperature to form a metal alloy in a molten state; the temperature range of high-temperature sintering is set to be 700-1000 ℃;
s12, cooling: and cooling to solidify the metal alloy in a molten state at the stacking position to form a metal and silicon-based alloy system, and finally obtaining the laminated photovoltaic module cell string.
The specific steps of step S10 are as follows:
A. glue is dispensed or a layer of glue solution or a layer of glue tape is silk-screen printed on the main gate electrode on the front side of the stacking position to realize the gluing series connection of the adjacent battery pieces;
B. high-pressure air is blown by pressing or a wind knife to act on the stacking position, so that the adjacent battery pieces are in full contact;
C. volatilizing at 80-200 deg.C and decomposing to remove the silk-screen printing glue solution or spot glue solution or organic components in the adhesive tape;
D. and secondary pressing or blowing high-pressure air by using an air knife to ensure that the secondary of adjacent battery pieces is fully contacted and the battery pieces are fully and tightly contacted when entering high-temperature sintering.
The glue solution is a polymeric organic substance containing high-temperature rapid decomposition (for example, [ butyl Grace1], [ butyl Grace1] is used as the conductive glue PA-10 for the temporary shingle), and the purpose is to decompose the glue solution polymer in the subsequent high-temperature sintering process step, so that the slurry of adjacent battery pieces can be fully contacted and melted in the high-temperature sintering process of 700-900 ℃, thereby realizing the mutual rapid diffusion of metal particles in the slurry between the adjacent battery pieces and ensuring the recrystallization and solidification of metal in the cooling process after high-temperature sintering.
The wind pressure of the high-pressure air blown out by the air knife is more than 1 atmospheric pressure.
The paste used for printing in the steps S1 and S5 is silver paste or silver-aluminum paste; the paste for printing the main gate electrode on the front side in the step S8 is an organic matter which takes silver paste or silver-aluminum paste as a matrix and is added with an adhesive effect, and the specific components and proportions thereof are as follows: 80% of superfine silver powder, 5% of glass powder, 13% of acrylic polymer and the other 2% of components comprising thickening agent, thixotropic agent and defoaming agent; in which the ultrafine silver powder is used as a conductive functional phase and the acrylic polymer is used as an organic binder.
The conductive functional phase in the paste for printing the main gate electrode on the front side in step S8 may be one or more of copper powder, silver powder, aluminum powder, gold powder, carbon nanotube, and graphene.
Before the step S10, printing a back side main gate electrode on the back side of the battery piece, and drying; the front-side main gate electrode of the previous cell is partially stacked and coupled in series with the back-side main gate electrode of the next cell in the step S10.
In the step S10, glue is dispensed on the front side main gate electrode at the stacking position, and the front side main gate electrode of the previous cell and the back side main gate electrode of the next cell are glued and connected in series by means of glue dispensing; wherein the number of the glue dispensing is 2-10.
The width of the front side main gate electrode is generally controlled to be 2-10 mm.
The utility model discloses has positive effect: (1) the utility model does not need to adopt laser cutting, thus effectively solving the problem of the reduction of the light receiving area of the single cell; meanwhile, the metal alloy is used for replacing a traditional series connection mode that conductive adhesive is easy to age and resistivity is easy to increase, the series connection mode of the metal alloy can solve the problem that the resistivity of the laminated photovoltaic module is greatly increased along with the extension of the operation time, and therefore the failure probability of fire catching of the traditional photovoltaic laminated module due to the increase of series connection resistance can be greatly reduced.
(2) The utility model discloses put the high temperature sintering technology step of battery piece after positive avris main grid electrode and the main grid electrode silk screen printing of back avris, borrow screen printing thick liquids high temperature sintering technology 700 and supplant with food and drink 1000 ℃'s high temperature and realize the metal alloy series connection between the battery piece, because the temperature of sintering is usually about 850 ℃, be enough to make the thick liquids of printing be in the molten state and realize the inseparable joint that fuses between the adjacent battery piece, and 700 supplant with food and drink 1000 ℃'s high temperature is enough to use and falls in connecting the organic matter volatile component of adjacent battery piece pile up a glue solution.
(3) The utility model discloses the sintering of high temperature sintering's main objective is to realize piling up the department and printing thick liquids, forms silicon Ag-Si alloy or Ag-Al-Si alloy system, and in the high temperature interval of 700-; meanwhile, other organic components in the slurry can be completely decomposed and volatilized in a high-temperature environment, and only a molten metal layer is left.
(4) The utility model discloses paste of well printing positive avris main grid electrode, the main objective is to realize collecting positive battery piece photogenerated carrier, especially collects the photogenerated carrier that comes from positive thin grid electrode and positive main grid electrode transmission, also includes the photogenerated carrier that comes from the silicon substrate that positive avris main grid electrode covered; therefore, the choice of paste is not limited to silver paste with good conductivity but high cost, including paste doped with other conductive functional phases, such as copper powder, aluminum powder, gold powder, carbon nanotubes, graphene.
(5) The utility model discloses well metal alloy series connection is based on silica-based alloy hookup, specific mechanism is that 700 supplyes 1000 ℃ of high temperature provides the high temperature fast diffusion environment for the thick liquids of battery piece avris electrode printing, under high temperature environment, the crystal lattice vibration aggravation of silicon crystal, the silicon atom that leads to the covalent bond connection of silicon crystal is unstable, there is partial silicon atom to break away from original covalent bond linkage system, and metal particle in the thick liquids also the crystal lattice vibration aggravation under the high temperature, lead to metal particle to diffuse fast to the silicon substrate of battery piece in, form the co-melting system of metal-silicon, the utility model discloses in preferably form the alloy system of Ag-Si, Al-Si or Ag-Al-Si.
Drawings
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is given in conjunction with the accompanying drawings, in which
Fig. 1 is a process flow diagram of a conventional shingled photovoltaic module cell string;
FIG. 2 is a process flow diagram of the preparation method of the present invention;
fig. 3 is a front printed view of a metal alloy series connected string of shingled photovoltaic modules of the present invention;
fig. 4 is a back side electrode print of a metal alloy series connected stack assembly cell string of the present invention;
fig. 5 is a schematic side view of a metal alloy series-connected shingle assembly cell string according to the present invention;
fig. 6 is a schematic structural view of a metal alloy series-connected shingled photovoltaic module cell string according to the present invention.
Detailed Description
The process of the traditional tiled photovoltaic cell string is shown in fig. 1, wherein when the conventional cell flows to the production end of the module, the cell needs to be cut into strips by a laser cutting machine, and the specific area size of the cut cell is determined according to the design of the module. The area of the battery piece is reduced by cutting the battery piece, so that the light receiving area of a single battery piece is reduced, the current of the battery piece and the light receiving area of the battery piece are in a positive correlation linear proportional relationship, and the voltage of the battery piece is a fixed value depending on the material characteristics and the structural characteristics of the battery piece. And then, dispensing conductive adhesive on the main grid electrode on the side by adopting a dispensing mode to realize the series connection of the adjacent battery pieces.
(example 1)
Referring to fig. 3 to 6, the metal alloy series-connected shingled photovoltaic module cell string of the present invention has 6 cells 1; the front surface of each cell 1 is provided with a front electrode, and the back surface of each cell 1 is provided with a back electrode; the front side electrode comprises a front side fine grid electrode 2, a front side main grid electrode 3 and a front side main grid electrode 4, wherein the front side fine grid electrode 2 is connected with the front side main grid electrode 3, and the front side main grid electrode 3 is connected with the front side main grid electrode 4; the back side electrode comprises a back side main gate electrode 5, a back electric field 6 and a back side main gate electrode 7, and the back side main gate electrode 5 is connected with the back side main gate electrode 7; the front-side main gate electrode 4 of the previous cell piece 1 and the back-side main gate electrode 7 of the next cell piece 1 are partially stacked and joined together at the stack by the molten post-solidified metal alloy 8 and form a series connection. Wherein the metal alloy 8 is solidified from the front-side main gate electrode 4 and the back-side main gate electrode 7 melted at the stack.
The metal alloy 8 is an Ag-Al-Si alloy.
The back of the battery piece 1 is also provided with a passivation layer. The passivation layer may be any one of a stacked passivation layer of Al2O3 and SiNx, a SiNx single-layer passivation layer, a stacked passivation layer of SiO2 and SiNx, and a multi-layer passivation layer of SiO2, Al2O3 and SiNx.
Referring to fig. 2, the method for manufacturing the metal alloy series-connected shingled photovoltaic module cell of the present invention includes the following steps:
s1, printing the back main grid electrode 5 on the back of the battery piece 1, wherein the printing slurry adopts silver paste;
s2, drying the paste printed by the back main grid electrode 5
S3, printing the back electric field 6 on the back surface of the battery piece 1;
s4, drying the paste printed by the back electric field 6;
s5, printing the front fine grid electrode 2 and the front main grid electrode 3 on the front surface of the battery piece 1; the printing slurry adopts silver paste;
s6, drying the paste printed on the front fine grid electrode 2 and the front main grid electrode 3;
s7, testing and sorting: deleting the battery piece 1 with the voltage and the current meeting the requirements;
s8, screen printing a front side main grid electrode 4 on the front side of the cell 1;
s9, drying the paste printed on the main grid electrode 4 on the front side;
s10, dispensing glue on the main grid electrode 4 on the front side of the stacking position to realize the glue serial connection of the adjacent battery slices 1;
s11, high-temperature sintering: sintering the printing slurry at the stacking position of the adjacent battery pieces 1 at high temperature to form a metal alloy 8 in a molten state; the temperature of high-temperature sintering is set at 700-1000 ℃;
s12, cooling: and cooling to solidify the metal alloy 8 in a molten state at the stacking position to form a metal and silicon-based alloy system, and finally obtaining the laminated photovoltaic module cell string.
The specific steps of step S9 are as follows:
A. glue is dispensed on the main grid electrode 4 on the side of the front face of the stacking position to realize the gluing serial connection of the adjacent battery pieces 1; wherein the number of the glue dispensing is 2-10;
B. high-pressure air is applied to the stacking position through pressing or blowing by a wind knife, so that the adjacent battery pieces 1 are fully contacted;
C. volatilizing at 80-200 deg.C and decomposing to remove the silk-screen printing glue solution or point glue solution or organic component in the adhesive tape;
D. and secondary pressing or blowing high-pressure air by using an air knife to ensure that the secondary of the adjacent battery pieces 1 is fully contacted and the battery pieces 1 are fully and tightly contacted when entering high-temperature sintering. Wherein the glue solution is DingGrace 1 and DingGrace 1 are conductive glue PA-10 for the Shichuang shingle.
The paste for printing the main gate electrode 4 on the front side in the step S8 includes a phase with a main conductive function of ultrafine silver powder, glass frit, an organic acrylic polymer binder, a thickener, a thixotropic agent, and a defoaming agent, wherein the acrylic polymer serves as the organic binder to realize an adhesion effect. The concrete components and proportions are as follows: 80% of superfine silver powder, 5% of glass powder, 13% of acrylic polymer and other 2% of components including thickening agent, thixotropic agent and defoaming agent.
Before the step S9, printing a back side main grid electrode 7 on the back side of the battery piece 1, and drying; the front-side main gate electrode 4 of the previous cell piece 1 and the back-side main gate electrode 7 of the next cell piece 1 are partially stacked and coupled in series in the step S9.
(example 2)
The components of the paste for printing the front side main gate electrode 4 in the step S8 of the utility model are as follows: 80% of superfine silver powder, 3% of glass phase, 15% of acrylic polymer, 1.5% of thickening agent, 0.4% of thixotropic agent and 0.1% of defoaming agent. Wherein the superfine silver powder is used as a conductive functional phase.
Other technical features are the same as those of embodiment 1.
(example 3)
The utility model discloses before step S9, do not carry out the printing of back avris main grid electrode 7, directly let the front avris main grid electrode 4 of last battery piece 1 partially pile up and form the series connection with the back electrode of next battery piece 1.
Other technical features are the same as those of embodiment 1.
(example 4)
The utility model discloses well electrically conductive function looks can be in silver powder, copper powder, aluminite powder, gold powder, carbon nanotube, graphite alkene one or more. Other technical features are the same as those of embodiment 2.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A metal alloy series-coupled shingled photovoltaic module cell string having a plurality of cells (1); the front surface of each cell (1) is provided with a front electrode, and the back surface of each cell (1) is provided with a back electrode; the front side electrode comprises a front side fine grid electrode (2), a front side main grid electrode (3) and a front side main grid electrode (4), wherein the front side fine grid electrode (2) is connected with the front side main grid electrode (3), and the front side main grid electrode (3) is connected with the front side main grid electrode (4); the method is characterized in that: the front-side main gate electrode (4) of the previous cell (1) and the back-side electrode portion of the next cell (1) are stacked and joined together at the stack by a molten post-solidified metal alloy (8) and form a series connection.
2. The string of metal alloy series-coupled shingled photovoltaic module cells of claim 1, wherein: the back electrode comprises a back main gate electrode (5) and a back electric field (6).
3. The string of metal alloy series-coupled shingled photovoltaic module cells of claim 2, wherein: the back side electrode also comprises a back side main grid electrode (7), and the back side main grid electrode (5) is connected with the back side main grid electrode (7); the front-side main gate electrode (4) of the previous cell piece (1) and the back-side main gate electrode (7) of the next cell piece (1) are partially stacked and joined together at the stack by a molten post-solidified metal alloy (8) and form a series connection.
4. The string of metal alloy series-coupled shingled photovoltaic module cells of claim 1, wherein: the metal alloy (8) is a silicon-based alloy.
5. The string of metal alloy series-coupled shingled photovoltaic module cells of claim 2, wherein: the metal alloy (8) is Ag-Si alloy or Al-Si alloy or Ag-Al-Si alloy.
6. A metal alloy series-coupled shingled photovoltaic module cell string according to claim 3, wherein: the metal alloy (8) is formed by solidifying a front side main grid electrode (4) and a back side main grid electrode (7) which are melted at the stacking position.
7. The string of metal alloy series-coupled shingled photovoltaic module cells of claim 1, wherein: the back of the battery piece (1) is also provided with a passivation layer.
8. The string of metal alloy series-coupled shingled photovoltaic module cells of claim 7, wherein: the passivation layer is a laminated passivation layer of Al2O3 and SiNx or a SiNx single-layer passivation layer or a laminated passivation layer of SiO2 and SiNx or a multilayer passivation layer of SiO2, Al2O3 and SiNx.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115000193A (en) * | 2022-05-24 | 2022-09-02 | 环晟光伏(江苏)有限公司 | Laminated photovoltaic module and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115000193A (en) * | 2022-05-24 | 2022-09-02 | 环晟光伏(江苏)有限公司 | Laminated photovoltaic module and manufacturing method thereof |
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