磁棒去除锂离子电池极片磁粉的影响因素

Influence factors of removing magnetic powder on Li-ion battery plate by bar magnet

探讨磁性金属粉末(磁粉)杂质类型、磁粉质量、磁棒磁感应强度、包覆磁棒物厚度和磁棒放置状态对极片用磁棒除去磁粉杂质(除磁)效果的影响。未打磨的不锈钢不具备磁性,打磨后的不锈钢粉具备磁性。磁感应强度为0.8500 T^0.9000 T的磁棒,吸附铁粉的最大距离比吸附不锈钢粉的长26.7%。当磁粉质量从0.02 g增至0.20 g时,磁粉被相同磁感应强度的磁棒吸附的最大距离变化率在3.0%以内。随着磁棒磁感应强度的增加,磁棒吸附铁粉和不锈钢粉的最大距离均增大。当包覆磁棒物厚度从0增至4.25 mm时,磁棒磁感应强度由0.6011 T衰减至0.1459 T。两条相同磁感应强度的磁棒错开放置时,吸附铁粉的最大距离平均值比完全面对面放置时长14.9%。

Effects of the type of magnetic metal powder(magnetic powder),weight of magnetic powder,magnetic induction of the bar magnet,thickness of the coated bar magnet and position state of the bar magnet on the effect of magnetic powder removed by bar magnet were discussed.Unpolished stainless steel was not magnetic and the polished stainless steel powder was magnetic.When magnetic induction of the bar magnet of 0.8500 T^0.9000 T,the maximum distance of iron powder adsorbed by the bar magnet was 26.7%more than that of stainless steel powder.When the weight of magnetic powder increased from 0.02 g to 0.20 g,the maximum distance change rate of magnetic powder adsorbed by the bar magnet with the same magnetic induction was within 3.0%.With the increase of magnetic induction,the maximum distance between iron powder and stainless steel powder was increased.When the thickness of the coating of bar magnet increased from 0 to 4.25 mm,the magnetic induction of the bar magnet was decreased from 0.6011 T to 0.1459 T.The average maximum distance from which iron powder was adsorbed when two bar magnets with the same magnetic induction were misplaced was 14.9%larger than that placed in full face.