In the first half of 2021, HJT heterojunction battery technology has been developed significantly, ushering in the first year of commercial mass production of heterojunction battery technology. Among a number of enterprises with early layout, Xuancheng Huasheng New Energy's 500MW HJT heterojunction high-efficiency battery module mass production line in Anhui Province took the lead in putting into production on March 18 to get a head start, and then after less than a month of debugging, shocked the industry with ultra-high trial production data on March 25 and April 13 twice, and even more so at the commissioning ceremony on April 24 with the optimal batch of champions of the piece of the ultra-high 24.73% efficiency evidence to give a new low-cost mass production line conversion rate record. efficiency of 24.73% for the best batch of champion chips, giving a new record of conversion rate for low-cost mass production line.
On May 12, SOLARZOOM, a well-known third-party platform in the new energy industry, joined hands with Huasheng New Energy, the creator of the new record, and its major equipment vendors, to explain this sample of the world's first low-cost HJT commercial mass production to the more than 200 elites from the capital market and those who are concerned about the HJT heterojunction technology at the Shanghai Center in an all-rounded manner and at a deeper level. Liu Chang, the founder of EVERFAMILY, has high expectation for this "HJT commercial mass production offline seminar", and said, "We firmly believe that with the arrival of the era of low-cost mass production of heterojunction, the price parity of optical storage will be realised ahead of schedule, and HJT will not be late and more importantly will not be absent from the meeting, which will contribute to the 3060 carbon neutrality. "HJT will not be late and will not be absent.
Promote N-type and P-type price parity through the "annealing and impurity absorption process of silicon wafers".
First of all, in order to fully realise the value of the heterojunction technology itself, more suitable low-cost, stable and efficient silicon wafers are needed. To achieve cost reduction until the final N-type and P-type products at the same price, it is recommended that the industry focus on the process of annealing absorption, the optimisation of the process can not only improve efficiency but also reduce the wafer manufacturing for the precision of the silicon material relies on, so as to substantially reduce the production of cost reduction.
Heterogeneous junction specific high-precision wafer demand
Secondly, heterojunction cells in the industry should use higher precision wafers. Because in the PVD coating process, the support of the tray will lead to the lack of backside coating, resulting in a loss of efficiency. And for every 0.1mm reduction in wafer tolerance, cell efficiency can be increased by 0.15%. High-precision silicon wafers with a tolerance of ±0.1mm can even improve efficiency by 0.2% for heterojunction cells.
Extended from cell half wafer to wafer half waferWhen the efficiency of heterojunction cells exceeds 24%, the microcryptic cracks generated by cutting the cell wafers will cause high power loss. In order to solve this difficulty, in addition to the existing non-destructive cutting methods, the industry can advance the half-cutting process from the module manufacturing end to the battery manufacturing end, wafer manufacturing end and even the production of silicon rods, which is expected to fundamentally reduce the loss caused by cutting.
