激光热应力分片技术对半片电池组件性能的影响

Influence of Laser Thermal Stress Slicing Technology on the Properties of Half-Cell Modules

大尺寸、薄片化、n型电池和半片电池组件已成为光伏行业发展的趋势,电池片的切割技术是影响半片电池组件输出功率和可靠性的关键因素。采用新型激光热应力分片技术对具有半开设计图形的双面电池片进行切割,以传统激光烧蚀技术作为参照,分析了两种技术对电池损伤、组件制程和可靠性的影响。利用3D显微镜、扫描电子显微镜(SEM)、I-V测试仪和抗弯强度测试仪,分析了通过两种技术制作的半片电池片的切割截面形貌、抗弯强度性能与半片电池组件的载荷性能、电性能。结果表明,新型激光热应力分片技术制作的半片电池片抗弯强度较传统激光烧蚀技术提高约27%,半片电池组件的输出功率提升了约0.69%,且新型激光热应力分片技术使半片电池组件机械载荷后的功率衰减率降低了约30%,提高了半片电池组件的可靠性。

Large-size,thin,n-type cells and half-cell modules have become the development trend of the photovoltaic industry.The cutting technology of cells is a key factor affecting the output power and reliability of half-cell modules.The new laser thermal stress slicing technology was used for cell dicing of bifacial cells with half-open design patterns.The traditional laser ablation technology was taken as a reference,the effects of the two technologies on cell damage,module manufacturing process and reliability were analyzed.By using 3D microscope,scanning electron microscope(SEM),I-V tester and flexural strength tester,the cutting cross-sectional morphology,flexural strength performance of the half-cell slice and the load performance and electrical performance of the half-cell module produced by two slicing techniques were analyzed.The results show that compared with the traditional laser ablation technology,the flexural strength of the half-cell slice produced by the new laser thermal stress slicing technology is increased by about 27%,and output power of the half-cell modules is increased by about 0.69%.And the power decay rate of the half-cell module after the mechanical load is reduced about 30%by using the new laser thermal stress slicing technology,and the reliability of the half-cell module is improved.