On July 14, Longji, Shanghai Jiaotong University, held a conference on innovative technology of optical storage called "Technology Forest". Unlike all the previous events, this time, Longji did not reserve the C bit for batteries or " It has a very vivid name- Technology Forest .
Each technology is a tree in the forest, rooted independently and connected with each other. They grow independently and can be combined continuously, eventually deriving new products, new solutions, and even new technology routes.
, the industry has tried many ways, but ultimately can not avoid a word-silver.
Silver has the best conductivity and has been the default choice for metallization of photovoltaic cells for decades. But the problem is that it is both expensive and scarce, and the global annual silver production is about 3.
During this period, some people tried to replace it with metal, but whether it is copper, aluminum or gold, the short board is very obvious. On the scene of
the press conference, the words of Li Zhenguo, the founder of Longji, were impressive: "In the end, we did not choose a certain kind of metal." Longji did not excessively tangle with silver paste, but redefined the material itself-ACM (nano-alloy matrix contact technology), through self-developed nano-alloy materials, replaced the traditional silver paste in an all-round way.
While retaining the conductivity, the resistance value is only 1/5-1/7 of the original, thus effectively reducing the ohmic loss in the current transmission process. Compared with the high temperature sintering method of the traditional grid line, the nano-alloy grid line adopts low temperature welding, and the pore is smaller, which avoids the reliability risk caused by pore water absorption under the traditional high temperature process, so that the cold and heat cycle resistance is stronger, and the humidity and heat resistance is greatly improved.
Conventional gate lines are responsible for both collecting and transporting electrons. Just like in the morning rush hour, buses and trucks are crowded in the same lane, and after a long time, the road is naturally congested. ACM uses matrix contact technology to split the two functions: the position responsible for collecting electrons uses point contact to minimize the contact area between metal and silicon wafer; the area responsible for transmitting current uses linear conduction to build a uniform current-carrying path to achieve high-speed charge flow.
Both of them have their own functions, and the effect is immediate. ACM single technology directly brings 3-5 W power increase.
Most importantly, in the context of the industry's general reduction of grid lines, Longji has done the opposite. ACM nano-alloy grid lines are 5-7 times wider than conventional grid lines. With BC's exclusive enhanced welding process, the risk of grid breaking is reduced by about 80%, the welding contact area is more than doubled, and the reliability of components has been improved in an all-round way.
Integrated conductive backplane: the solder strip used for 20 years is coming to an end!
In traditional modules, solder strips have always played an important role in connecting cells in series and collecting current, but at the same time, it is also the biggest risk to the long-term reliability of modules. Inside a component, the length of the welding strip is more than 400 meters, and the number of welding spots is up to 15000. Every solder joint is a potential variable in the manufacturing process. Soldering, desoldering, thermal stress, and resistive losses due to long transmission paths can significantly affect the performance of components. The general solution of the
industry is to tinker with the existing process-to make the welding strip thinner, denser and more stable.
And the answer given by Longji makes the welding strip, which has been used for more than 20 years, quit completely!
This process is very similar to the electronics industry in those days, from flying wire connection to PCB integration. Early electronic devices were connected by flying wires, and with the advent of printed circuit boards, the lines were integrated into a unified platform, and product reliability and manufacturing efficiency were also improved.
Today, a similar structural evolution is taking place in the photovoltaic industry. After the solder strip is
removed, the stress between the cell and the solder strip is greatly reduced. At the same time, the overall conductive area of the metal foil is increased by about 85%, compared with the resistance of the solder strip, it is reduced by nearly half, and the output power of the single module is steadily increased by 3-5 W. The larger area of metal coverage further shortens the water vapor penetration path and effectively improves the long-term weather resistance of the module.
Ultimately, the integrated conductive backplane technology will bring us six advantages of high water vapor resistance, high safety, high cold and thermal shock resistance, high load resistance, high power and low crack rate. The refactoring of
components is not limited to the way they are connected. From arrangement to structure, from material to management, Longji continuously enriches the whole forest with a "technology tree".
Longji lamination technology has changed the limitation of 2-3mm spacing between traditional cells, through 0.5-0.
Another impact is about 1. In order to solve this pain point, Longji hidden bus bar technology relies on integrated conductive backplane, compared with the traditional superimposed welding strip method (about 4 times the thickness of the cell). Strong pressure can easily lead to fragments and cracks), which reduces the thickness by more than 40%, thus realizing the safe transfer of the hidden bus bar to the back.
If ACM, integrated backplane, lamination and hidden bus technology are superimposed, the maximum power of 690W can be achieved under the standard size of 2382 × 1134. When BC components continue to break through the power boundary, new problems will arise. Especially for centralized scenes, it needs not only full screen high power, but also high double-sided rate, so Longji temperature control alloy interconnection technology emerges as the times require. Longji's Hi-MO 9 components also use this technology to achieve double high power and double-sided rate.
Compared with centralized, distributed pain points are more diverse. During the 25 years from the factory to retirement of
a component, factors such as shelter, orientation difference and complex roof will affect its actual power generation performance. Longji Smart Module Technology has passed intelligent monitoring and
At present, the technology is mature, and the global product launch of intelligent components will be held in Brazil on August 25, and mass production and delivery are expected to be achieved in October.
Sanfang Pro: Seven months of outdoor demonstration, single-watt power generation increased 2.
Longji's "technology forest" is not just a concept, but has already produced its first fruits. Sanfang Pro, as a brand new product based on "omnidirectional anti-ash technology" and "ACM technology" in Longji Technology Forest, is one of them. This product is also a new upgrade of Longji on its mature three-defense platform.
In the past, the anti-dust design of components was more aimed at traditional vertical installation scenarios. However, with the rapid development of industrial and commercial photovoltaic, more and more roof projects choose horizontal installation scheme. The installation method has changed, and the anti-dust design, which originally only covered the short side, also needs to be re-adapted.
Longji starts directly from the frame structure. The frame is flush with the glass height through the integrated L-shaped edge wrapping design of the long edge and the short edge, and the influence of dust accumulation can be reduced no matter the frame is installed horizontally or vertically. Outdoor demonstration for seven consecutive months shows that the power generation per watt of the product has increased by 2.
For the structural challenges brought by glass weight and long-term load in the era of large-size components, Sanfang Pro also gives solutions. Aiming at the problem of component depression in long-term operation, the product adopts L-shaped alloy edge wrapping, high-strength buckle frame and integrated lamination process, which reduces the depression amplitude of component center by more than 67%; facing complex application environments such as coastal, water, plateau and so on, the dynamic load test of more than 60000 times is completed, which further improves the reliability of long-term operation.
At the same time, the new frame structure also optimizes the transportation and installation links, each support can accommodate 41 pieces (36 pieces of conventional products), and the overall installation efficiency is increased by 30% by 17.
These changes have not set new records in the laboratory, but they will really affect the power generation revenue of a power station for 25 years. The boundary of
technological innovation does not stop at the components themselves. With the deep integration of photovoltaic, energy storage and energy use scenarios, energy management is becoming the focus of competition in the next stage of the industry. Based on this judgment, Longji launched the LONGi One OS energy storage management platform. Through AI analysis of electricity price, weather, photovoltaic output and load data, the platform can dynamically optimize the charging and discharging strategy of energy storage, and integrate photovoltaic, energy storage, charging piles and energy load into a unified management.
From manufacturing products to managing energy, Longji's technology layout has extended from a component to the whole system.
Looking back on the ups and downs of China's photovoltaic industry in the past 20 years, from "three heads outside" being controlled by others to fully grasping the initiative of the industry, every landmark leap has been made. It is accompanied by the thunder of breaking the technical situation.
Behind these magnificent waves, half of them are written by innovation, and the other half go with Longji.
And this same frequency is by no means accidental.
Over the past 24 years, Longji has stood at the crossroads of industrial change several times, answering the proposition of the times with innovation. Make a firm bet in the game between single crystal and polycrystalline; break into the no-man's land alone in the throes of localization of diamond wire; take the lead in exploring the next generation of efficiency highland before the arrival of the BC era..
Today's "technology forest" is the continuation of this innovative gene.
From materials, structures, components, systems, and energy ecology, what Longji is building is not a single-point breakthrough technology path, but a set of growth systems that are layered, mutually generated, and self-evolving.
Trees will grow old, products will iterate, and what really determines the value of a forest is never the tallest tree, but its ability to continue to grow and breed seeds.
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