CN210778622U - Large silicon 200 solar cell MWT high-efficiency component - Google Patents

Abstract

The utility model discloses a big silicon 200 solar cell MWT high-efficiency component, which is a four-layer structure formed by stacking front coated toughened embossed glass, an insulating layer, an MWT back contact battery pack and an integrated back plate in sequence, wherein the integrated back plate is connected with the MWT back contact battery pack to form a battery component, and EVA adhesive films are filled between the battery component and the front coated toughened embossed glass and the integrated back plate; the integrated back plate comprises a substrate, an adhesive layer and a conductive foil layer which are sequentially stacked from bottom to top, wherein the conductive foil layer is adhered to the substrate through the adhesive layer. The utility model provides a with the big silicon 200 battery pieces of high-efficient solar cell and half piece combination into big silicon 200 half piece subassembly, reinforcing component 5-30% efficiency and improved comprehensive properties, big silicon 200 half piece subassembly is on the reliability, owing to reduced internal current and internal loss, subassembly operating temperature reduces, hot spot probability greatly reduced also.

Description

Large silicon 200 solar cell MWT high-efficiency component

Technical Field

The utility model relates to a big silicon 200 solar cell MWT high-efficient subassembly belongs to MWT solar module processing technology field.

Background

With the survival of solar photovoltaic systems from subsidies in various countries to complete marketization, investors increasingly demand cost reduction of efficient components. The reduction of the LCOE power cost is an empirical curve effect derived from the efficiency improvement and the industrial scale expansion brought by the technology research and development, and the continuous improvement of the component efficiency is an important step of the marketing process of the industry. The current of the battery piece is higher and higher in combination with the continuous promotion of the current high-efficient battery piece, and the hot spot benefit danger coefficient of the packaged assembly is obviously promoted, and the current loss is increased, and the generated energy is also influenced along with the current. In order to solve the problem, a half-cell module is an effective method, and the half-cell technology is to cut a standard cell (such as 162.75mmx162.75mm) into two half-cells (such as 162.75x81.375mm) with the same size by using a laser cutting method, so that the current in the half-cell module is reduced by half. As the current decreases, the power loss inside the battery decreases. The power loss is generally proportional to the square of the current, so that the power loss of the whole assembly is reduced to one fourth (Ploss = RI2, where R is resistance and I is current), the power loss of the half-cell is reduced, a larger filling factor and higher conversion efficiency can be achieved, and larger power generation can be achieved.

In order to follow the market demand for efficient components, half of the solar cell module is the future development direction, and in the long run, people need to compete with conventional energy, so that the cost performance of photovoltaic power generation needs to be continuously improved, meanwhile, the development demand of the people is combined, and a battery module with higher cost performance is developed.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: problem and not enough to exist among the prior art, the utility model provides a big silicon 200 solar cell MWT high-efficient subassembly with low costs, sexual valence relative altitude, the little and power of generated energy loss improves greatly.

The technical scheme is as follows: the MWT high-efficiency component of the large silicon 200 solar cell is a four-layer structure formed by sequentially stacking front-side coated toughened patterned glass, an insulating layer, an MWT back contact battery pack and an integrated back plate, wherein the integrated back plate and the MWT back contact battery pack are connected into a cell component, and EVA (ethylene vinyl acetate) adhesive films are filled between the cell component and the front-side coated toughened patterned glass and between the cell component and the integrated back plate; the integrated back plate comprises a substrate, an adhesive layer and a conductive foil layer which are sequentially stacked from bottom to top, wherein the conductive foil layer is adhered to the substrate through the adhesive layer; the MWT back contact cell stack comprises a set of half-cells made of 200mm x 200mmm large silicon cells; the positive/negative electrodes of the half cell assemblies are respectively arranged at 6 × 4/8 × 8; the distance between the negative electrodes of the battery piece is 27mm, and the distance between the negative electrodes and the positive electrode of the battery piece is 10.5 mm.

The utility model discloses the technical scheme who further injects does: the conductive foil layer is a copper foil, the bonding layer is an EVA (ethylene vinyl acetate) adhesive film, and the substrate is a photovoltaic back plate.

Furthermore, an aluminum frame is surrounded around the four-layer structure, and an aluminum support rod is fixedly installed in the middle of the aluminum frame.

Furthermore, the insulating layer is made of an EVA-PET-EVA composite material through punching and trimming.

Further, the MWT back contact battery is 72 version, which is 2470 × 1245 × 40 mm in size.

Has the advantages that: compared with the prior art, the utility model provides a with the half piece combination of the big silicon 200 battery piece of high-efficient solar cell into big silicon 200 half piece subassembly, reinforcing means 5-30% efficiency and improved comprehensive properties, big silicon 200 half piece subassembly is on the reliability, owing to reduced internal current and internal loss, subassembly operating temperature reduces, hot spot probability greatly reduced also. Meanwhile, under the conditions of shadow shielding and assembly edge dust accumulation, the large silicon 200 half-piece assembly half-piece technology can reduce the power generation loss by 3/4 at most. It is presently believed that the power-up and price-down half-chip technology of large silicon 200 half-chip modules is the most consistent with current technology trends.

Drawings

Fig. 1 is an exploded view of the whole structure of the embodiment of the present invention.

FIG. 2 is a schematic diagram of a large silicon wafer structure of an MWT high-efficiency back contact module.

FIG. 3 is a schematic view of a core of an MWT back contact assembly.

FIG. 4 is a schematic diagram of a MWT back contact device structure.

Detailed Description

The invention will be further elucidated with reference to the drawings and the specific embodiments.

As shown in fig. 1-4, by taking development of large-size 200mm high-efficiency cell sheets and high-efficiency components as an example, the production line equipment is upgraded and modified, so that the production line meets the mass production conditions of 200mm high-efficiency cell sheets and high-efficiency components; the 72 version module has power up to 635 w. 72 type: 2470 × 1245 × 40 mm; the back contact electrode point of the assembly is changed from positive/negative electrode 5 × 5/6 × 6 to positive/negative electrode 6 × 4/8 × 8, and from original cell piece 162.75 × 162.75 to 200 × 200 mm. The original distance between the negative electrodes of the battery piece is changed from 26mm to 27mm, and correspondingly, the distance between the negative electrodes and the positive electrodes is changed from 13.5mm to 10.5 mm.

The concrete structure is from bottom to top frame 1, back plate 2, conductive copper foil 3, EVA adhesive film 4, MWT back of the body contact group battery 5, EVA adhesive film 6, the high glass 7 that passes through of tempering. The conductive copper foil 3 is bonded on the back plate 2 through an EVA adhesive film 4 to form an integrated back plate.

Preferably, the structure of the utility model is surrounded with an aluminum frame. The middle position of the aluminum frame is fixedly provided with an aluminum support rod, and the wall thickness of the aluminum frame is 1.6-1.8 mm. The four sides are reinforced by the aluminum frame after packaging, the specific frame is fixed to enable the MWT assembly to be firmer, the material cost is greatly saved by the aid of less glass, the MWT assembly can be packaged and transported by using an ordinary carton instead of a wooden box through design of the aluminum frame, packaging cost is saved, four corners and edges of the assembly are well protected through design of the aluminum frame, the assembly is protected in manufacturing/transporting/installing processes, and collision and damage are prevented. The design of aluminium frame can rely on the aluminium frame to install, and its anti-wind presses snow to press the ability more excellent and can reach 9000 pa.

Preferably, the thickness of the front-surface coated toughened embossed glass with the structure is 2.5mm or 3.2 mm.

The large silicon 200 assembly adopts the conductive foil circuit and the flexible conductive adhesive, so that the reliability is improved. Because welding is not needed, the problems of hidden cracks and poor contact caused by the large silicon 200 assembly inside are solved, and the attenuation of the large silicon 200 assembly under the 3-time IEC standard is lower. Also a high performance backplane, which is also a technology unique to large silicon 200 components, an integrated conductive backplane for MWT components, and an insulating layer material. The integrated conductive backboard structure consists of a substrate, an adhesive layer and a conductive foil layer. The conductive foil is adhered to the substrate through the adhesive layer to form a composite structure of a conductive layer, the adhesive layer and the substrate from top to bottom. The conducting layer in the conducting backboard is a copper foil, the bonding layer is an EVA (ethylene vinyl acetate) adhesive film, and the substrate adopts a common photovoltaic backboard. The insulating layer material is a finished product of EVA-PET-EVA composite material after punching and trimming, because the conductive foil circuit in the insulating layer is not available on the existing assembly, the large silicon 200 assembly adopts the metal conductive foil, the water permeability of the back plate can be greatly reduced, and the weather resistance of the assembly is improved. In addition, the large silicon 200 component power station operates at a lower temperature than conventional during the power station process, which also benefits from the effect of the conductive foil dissipating heat therein. And also a lower series resistance. This is the construction of a large silicon 200 assembly, a conventional cell, with positive and negative electrodes distributed at both ends of the cell. The efficient MWT back contact battery technology is a metal perforation winding technology, main grid lines of a front electrode are eliminated through laser perforation and back wiring, the front electrode of the battery is led to the back side in a penetrating mode, positive and negative electrode points of the battery are distributed on the back side of a battery piece, and electric energy conversion efficiency is high. Because the battery has no welding rod and high technical compatibility, the battery can effectively avoid performance attenuation, is also suitable for thinner silicon wafers, is favorable for reducing the cost, and is a promising crystalline silicon industrialization technology. Better power generation and less refraction, hidden crack, poor contact and the like are eliminated, and the method can be compatible with other technologies. The novel battery piece is characterized in that the pattern is customizable and can be customized on the premise of not influencing the performance, and various patterns can be made.

Because the large silicon 200 assembly has no solder strip, the back technology is adopted, similar to the semiconductor circuit assembly technology, the metal conductive foil is added, and the hard force in the welding is avoided. Several comparisons are made in 3 times IEC test standard in laboratory, and the system is conventional assembly and conventional double-glass, MWT's single glass assembly in addition, MWT's double-glass assembly, and the MWT subassembly is also far away and ahead of conventional assembly. The conventional assembly has significant attenuation at the time of TC600, while the MWT assembly remains controlled at around 1.5.

The utility model discloses a design has multiple advantage: the problem of hot spot effect of the assembly is reduced; the water permeability is greatly reduced, the weather resistance is improved, and the potential risk of PID (proportion integration differentiation) is avoided, 3, the efficiency is high, the conversion efficiency is improved by 0.6 percent in absolute value, and the output power is higher than that of a conventional component by more than 5-15 percent; the lower temperature coefficient is-0.36%/DEG C, and the higher generated power is kept. The high reliability, two-dimensional PCB packaging technology, reduce the package loss of the assembly, have zero welding process, avoid the stress brought by high-temperature welding, poor welding and hidden crack and other problems. The solar cell has the technical advantages that no main grid line exists, the front shading area is reduced by 3%, the efficiency is higher, and the ratio of the front shading area to the industry average value is about 15-30W. And no welding strip is used, so that performance attenuation caused by welding stress and micro hidden cracks is avoided. The ultrathin silicon wafer has extremely good flexibility, can be applied to thinner silicon wafers, and is beneficial to reducing the cost. The large silicon 200 has technology compatibility and can be compatible with black silicon, PERC, HIT and the like. The large silicon 200 assembly adopts back contact connection, namely holes penetrating through a battery plate are designed on the battery, the holes are filled by conductive paste so as to lead electrodes on the front surface to the back surface, and corresponding areas led to the back surface are isolated from a back electric field

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principle of the present invention, and these modifications should also be regarded as the protection scope of the present invention.

Claims (5)

1. Big silicon 200 solar cell MWT high efficiency module, its characterized in that: the battery pack is characterized by comprising a four-layer structure formed by sequentially stacking front coated toughened patterned glass, an insulating layer, an MWT back contact battery pack and an integrated back plate, wherein the integrated back plate and the MWT back contact battery pack are connected to form a battery pack, and EVA (ethylene vinyl acetate) adhesive films are filled among the battery pack, the front coated toughened patterned glass and the integrated back plate; the integrated back plate comprises a substrate, an adhesive layer and a conductive foil layer which are sequentially stacked from bottom to top, wherein the conductive foil layer is adhered to the substrate through the adhesive layer; the MWT back contact cell stack comprises a set of half-cells made of 200mm x 200mmm large silicon cells; the positive/negative electrodes of the MWT back contact battery pack are respectively arranged at 6 × 4/8 × 8; the distance between the negative electrodes of the battery piece is 27mm, and the distance between the negative electrodes and the positive electrode of the battery piece is 10.5 mm.

2. The large silicon 200 solar cell MWT high efficiency module as claimed in claim 1, characterized by: the conductive foil layer is a copper foil, the bonding layer is an EVA (ethylene vinyl acetate) adhesive film, and the substrate is a photovoltaic back plate.

3. The large silicon 200 solar cell MWT high efficiency module as claimed in claim 2, characterized by: the four-layer structure is surrounded by an aluminum frame, and an aluminum support rod is fixedly installed in the middle of the aluminum frame.

4. The large silicon 200 solar cell MWT high efficiency module as claimed in claim 3, characterized by: the insulating layer is made of an EVA-PET-EVA composite material through punching and trimming.

5. The large silicon 200 solar cell MWT high efficiency module as claimed in claim 4, characterized by: the MWT back contact cell stack was a 72 version, with a size of 2470 x 1245 x 40 mm.

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