The bursts of picosecond laser pulses have nanosecond-level short interval delay. These bursts contain a variable number of sub-pulses, which are used for laser cutting of copper current collector and graphite anode material for Li-ion battery anode. The influences of 2–10 sub-pulses on kerf edges were studied and were compared with that of a single pulse. The shapes of anode edge cut under different conditions, obtained using scanning electron microscopy (SEM), revealed that using burst mode would yield a smaller heat-affected zone (HAZ) of the copper current collector and smaller delamination width of graphite anode material. The capability of laser cutting of anode was characterized with maximum single-time cutting speed. Results showed that the cutting efficiency was raised evidently with the increase in the number of pulses in a burst, and the maximum cutting speeds for the copper current collector and graphite anode material could reach 3,800 mm/s and 500 mm/s respectively.

中文翻译：

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突发模式下锂离子电池负极材料的高速脉冲激光切割

皮秒激光脉冲的突发具有纳秒级的短间隔延迟。这些脉冲串包含可变数量的子脉冲，用于激光切割铜集电器和锂离子电池负极石墨负极材料。研究了2-10个子脉冲对切口边缘的影响，并与单个脉冲的影响进行了比较。使用扫描电子显微镜（SEM）获得的不同条件下的阳极边缘切割形状表明，使用突发模式将产生更小的铜集流体热影响区（HAZ）和更小的石墨阳极材料分层宽度。阳极的激光切割能力以最大单次切割速度为特征。结果表明，随着突发脉冲数的增加，切割效率明显提高，