Chain lithography machine makes BC battery production more efficient, with a half-cell capacity of 27,000 pieces/h!

In recent years, back contact (BC) battery modules have stood out with three core advantages.

• First, the front-side gridless design, increases the photoelectric conversion efficiency by 0.3%-0.5%, thereby increasing the system power generation;
• Second, the all-black aesthetic design, perfectly adapts to the needs of building-integrated photovoltaics (BIPV), and its visual characteristics with a reflectance of less than 3% make it the preferred solution for BIPV projects;
• Third, the lightweight structure and high-efficiency power generation performance, highly matches distributed scenarios, especially in household and small commercial rooftop applications, generating more clean electricity in a limited area, and has received widespread market acclaim.

In terms of bidding, recent GW-level photovoltaic project bids have established separate sections for BC components, and the procurement volume ratio is gradually increasing. With the acceleration of technological iteration, the characteristics of low temperature coefficient and small PID effect of BC components are further highlighted. It is expected that the BC market size will grow rapidly from 2025 to 2027, and the global BC component market size will exceed 50 GW in 2027, forming a differentiated competitive barrier in the high-efficiency distributed field, opening a new era of "aesthetic efficiency" for photovoltaic applications, and also putting forward higher requirements for related manufacturing equipment (especially lithography equipment).

What are the advantages of lithography technology solutions?

01
High efficiency potential:

The average mass production efficiency of BC batteries is higher than 27.0%, and there is still more than 1.5% room for improvement, and lithography will help to improve efficiency.

02
Production capacity increased by 2-3 times, initial investment decreased by 50%-70%:

Full-cell capacity 15500 pieces/h, half-cell capacity 27000 pieces/h; p and n graphic dual processes, equipment investment 14 million yuan/GW.

03
BC does not require acid etching process:

Using chain lithography technology, the front-side plating can be removed during the de-coating process, eliminating the need for acid etching.

04
High graphic accuracy:

The uniformity of poly width reaches 1%-2%, and the range is 8 um.

Lithography forms a 190 um wide poly-Si finger graphic

05
Non-destructive film opening, suitable for complex graphics without loss of production capacity:

Compared with laser high-temperature film opening, lithography uses wet film opening and does not produce thermal damage. Lithography uses a single exposure screen, only needs to replace the mask, and does not need to sacrifice production capacity.

06
High double-sided rate:

Lithography is a low-temperature process, which can further reduce the thickness of poly-Si.

Why choose a BC chain lithography machine?

Currently, TBC battery graphic equipment has been tested on the client side and applied to 182.2*105 large-size rectangular cell processes, including chain PSG (n+-poly-Si) lithography machine and chain BSG (p+-poly-Si) lithography machine. In 2025, three new products will be launched, mainly used for TOPCon front and back poly-Si finger (p+, n+) and HBC battery graphics. The BC battery chain lithography machine has a length range of 18-22 meters and includes three major parts: chain roll coating photoresist, exposure alignment system, and wet process system. The TOPCon poly finger chain lithography machine has a length range of 8-9 meters and includes two major parts: chain roll coating photoresist and exposure alignment system. The equipment has mass production capacity, and a 24-track large-capacity half-cell mass production machine will be shipped in July.