Photovoltaic research report: "Non destructive laser cutting technology for PERC/HJT/TOPCon solar cells"

     01. Introduction to the Technical Principle of Hidden Cutting Laser Slicer:

     Invisible cutting is a cutting technique that focuses a semi transparent wavelength laser beam inside the workpiece material

to form a starting point for segmentation, and then applies external force to the wafer to divide it into small chips.

     Technical advantages:

     1. Good slicing effect

     2. No dust generation

     3. There is no damage to the internal structure and no accumulation of heat

     4. Good straightness

     5. No need for slotting at both ends and spraying water

     6. The laser processing technology of invisible cutting has little effect on the lifespan and durability of the device, and the

range of temperature rise above 150 ℃ is only within a radius of 7 μ m

     02. Introduction to the principle of non-destructive laser cutting machine technology:

     The uneven distribution of thermal stress generated by laser irradiation promotes crack propagation and the cutting

technology for separating brittle materials. When the workpiece is irradiated with laser, the energy at the laser site is high, while

the energy at other places is low. Causing an uneven temperature field in the workpiece (the highest temperature does not

cause the material to soften or melt), the uneven temperature field will create a temperature gradient, which induces the

generation of thermal stress. When the thermal stress reaches the material's fracture strength, it will cause the material to

fracture, thereby achieving controllable crack trajectory cutting.

     Technical advantages:

     1. No dust generation

     2. No thermal accumulation occurs

     3. Good straightness

     4. No loss

     5. No internal structural damage

     6. Excellent electrical performance

     7. Good mechanical strength

     With the advent of the new era of battery cells, new battery technologies with greater efficiency potential such as TOPCon,

HJT, XBC, etc. have emerged one after another. Laser is an effective technology for reducing costs and increasing efficiency in

photovoltaic cells. The team of Zhongbu Qingtian New Energy Company has been researching in the industrial automation

integration industry of solar photovoltaic for many years, and has multiple laser cutting products to adapt to the production of

different solar cells. They are determined to become a leader in the intelligent manufacturing of photovoltaic equipment and a

strong practitioner of the national "dual carbon target".

     The team of Zhongbu Qingtian New Energy Company has been researching in the industrial automation integration

industry of solar photovoltaic for many years, and can provide enterprises with a turnkey solution for 10-500MW fully automatic

photovoltaic module production lines.