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摘要:为适应锂离子动力电池行业发展需求，寻求一种高效高质切片方式，本文研究了多种 器的切片质量。通过影像测量仪和扫描电镜（SEM）对比发现，100 ns脉宽调Q型1 064 nm光纤 器切割正极铝箔时毛刺和热影响区（HAZ）约为15 μm和60 μm，切负极铜箔时HAZ约为200 μm；20 ns脉宽的MOPA光纤 器切割铝箔毛刺10 μm，HAZ约为20 μm，切铜箔时HAZ约70 μm；脉宽为10 ps的固体 器切割铝箔毛刺和HAZ分别约为6 μm和10 μm，切铜箔时实现无熔融重凝区；20 ns脉宽的355 nm紫外和532 nm的绿光固体 器切割铝箔HAZ分别为10 μm和17 μm，切铜箔时HAZ则分别为大于70 μm和100 μm。实验结果表明：脉宽越窄，重复频率越高，切割的极片质量越好，ps 器切割的极片精度最高，质量最好，是切割极片最理想 器。而目前，频率高、脉宽相对窄的MOPA光纤 器切割速度最高，切割的正极片完全满足工业要求，更适合极片切割的工业推广。Abstract:In order to meet the demand of lithium-ion battery industry, and to seek a high-efficiency and high-quality cutting method, the cutting quality by various lasers are investigated. Comparing with the image measuring instrument and SEM, it is found that the burr and heat-affected zone(HAZ) of aluminum foil cut by Q-type 1 064 nm fiber laser with 100 ns pulse width are about 15 μm and 60 μm, and the HAZ of negative copper foil is about 200 μm, the burr and HAZ of aluminum foil cut by MOPA fiber laser with 20 ns pulse width are 10 μm and 20 μm, respectively, and the HAZ of copper foil is about 70 μm. The burr and HAZ of aluminum foil cut by 10 picoseconds pulsed solid laser are about 6 μm and 10 μm separately, a zone of no melting and re-condensation is achieved when copper foil is cut. The HAZ of aluminum foil are about 10 μm and 17 μm respectively when they are cut by 355 nm UV and 532 nm green solid lasers with 20 ns pulsed width. However, the HAZ are more than 70 μm and 100 μm when cutting copper foil. The experimental results show that the narrower the pulse width and the higher the repetition frequency, the better the cutting quality of pole piece. The PS laser cuts the pole piece with the highest precision and the best quality, which is the most ideal laser for cutting the pole piece. At present, the MOPA fiber laser with high frequency and relatively narrow pulse width has the highest cutting speed, and the cut positive electrode piece fully meets the industrial requirements, and is more suitable for the industrial promotion of the pole piece cutting.
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图 2调Q光纤 器切割极片质量图(平均功率P=100 W, 波长λ=1 065 nm, 脉宽τ＝100 ns, 重复频率F=100 kHz, 聚焦光斑约为60 μm, 正极切割速度v=1 800 mm/s，负极切割速度v=500 mm/s)
Figure 2.Quality maps of electrode sheet cut by Q-swiched fiber laser(average powerP=100 W, wavelengthλ=1 065 nm, durationτ＝100 ns, pulse repetition frequencyF=100 kHz, focus beam about 60 μm, cutting velocityv=1 800 mm/s for Al-foil andv=500 mm/s for Cu-foil)
图 320 ns MOPA 切割的正负极片(波长λ=1 065 nm, 平均功率P=100 W, 最大单脉冲能量E=0.13 mJ, 脉宽τ＝20 ns, 重复频率F=760 kHz, 聚焦光斑约60 μm)
Figure 3.Electrode sheets cut by 20 ns MOPA laser(wavelengthλ=1 065 nm, average powerP=100 W, max pulse energyE=0.13 mJ, durationτ＝100 ns, pulse repetition frequencyF=760 kHz, focus beam about 60 μm)
图 410 ps 切割的正负极片(波长λ=1 064 nm, 平均功率P=9.1 W, 重复频率F=300 kHz，脉冲宽度τ＝10 ps，单脉冲能量＞50 μJ)
Figure 4.Quality maps of electrode sheets by 10 ps solid laser(wavelengthλ=1 064 nm, average powerP=9.1 W, durationτ＝10 ps, pulse repetition frequencyF=300 kHz, Max pulse energy > 50 μJ)
图 5532 nm和355 nm 切割的极片(532 nm绿光参数：波长532 nm：平均功率P=16 W, 重复频率F=40 kHz，脉冲宽度τ＝20 ns以及355 nm紫外光参数：波长355 nm，平均功率P=8 W, 重复频率F=40 kHz，脉冲宽度τ＝20 ns)
Figure 5.Electrode sheets cut by 532 nm and 355 nm solid lasers(green laser:wavelengthλ=532 nm, average powerP=16 W, durationτ＝20 ns, pulse repetition frequencyF=40 kHz; uv laser: wavelengthλ=355 nm, average powerP=8 W, durationτ＝20 ns, pulse repetition frequencyF=40 kHz)
表 1各种 器切割正负极片的质量
Table 1.Qualities of positive and negative electrodes cut by different kinds of lasers
器及相应参数 正极 负极 评价 532 nm皮秒 器@τ=10 ps,
F=300 kHz,P=9.1 W毛刺：6 μm HAZ:10 μm
切速：2 800 mm/s毛刺：无, HAZ:无熔融热影响区
切速：800 mm/s最优 1 064 nm MOPA 器@τ=20 ns,
F=760 kHz,P=100 W毛刺：10 μm HAZ:20 μm
切速：2 800 mm/s以上毛刺：很小HAZ:熔融区60 μm
切速：800 mm/s较优 355 nm固体 器@τ=20 ns,
F=40 kHz,P=8 W毛刺：小HAZ:10 μm
切速：600 mm/s毛刺：较小, HAZ:＞70 μm
切速：400 mm/s一般 1 064 nm调Q光纤 器@τ=100 ns,
F=100 kHz,P=100 W毛刺：15 μm, HAZ: 60 μm
切速：1 800 mm/s毛刺：-, HAZ:200 μm
切速：500 mm/s较差 532 nm固体 器@τ=20 ns,
F=40 kHz,P=16 W毛刺：小HAZ:17 μm
切速：1 000 mm/s毛刺：-, HAZ:100~200
μm切速：600 mm/s较差 
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