双极板作为钒电池关键部件之一，其低导电性已成为制约电池性能提升的关键因素。以聚乙烯（PE）和不同维度导电填料，如球状炭黑（CB）、鳞片石墨（FG）、线状碳纤维（CF）和碳纳米管（CNTW）为主要原料，制备了点-线-面三维高导电网络碳塑复合双极板，并深入分析了导电机制。结果表明：33%的球状炭黑可以在聚乙烯内部形成导电通路。15% FG增加了与炭黑的接触面积，从而增加碳塑复合双极板的导电性。7% CNTW和5% CF的加入在双极板中形成短程和长程导电通路，此时电导率和抗弯强度最佳，达到20 S/cm和46.5 MPa。该双极板在300 mA/cm²高电流密度下能量效率达到70%，相对于CB/FG双极板提高了6.5%，且稳定运行500次充放电循环能量效率没有明显衰减，表明该双极板具有良好的倍率性和使用寿命。

As one of the components of vanadium batteries, the low conductivity of bipolar plates has become an important factor in restricting the improvement of battery performance. Polyethylene (PE) and various dimensional conductive fillers, such as spherical carbon black (CB), flake graphite (FG), linear carbon fiber (CF), and carbon nanotubes (CNTW), were used as the main raw materials to prepare a point-line-surface three-dimensional highly conductive network carbon plastic composite bipolar plate, and the conductive mechanism was analyzed. The results show that 33% CB can form a conductive path inside PE. The addition of 15% FG increases the contact area with carbon black, thereby enhancing the electrical conductivity of the carbon plastic composite bipolar plate. The addition of 7% CNTW and 5% CF in the bipolar plate forms short-range and long-range conductive pathways, resulting in optimal electrical conductivity and bending strength of 20 S/cm and 46.5 MPa, respectively. The energy efficiency of the bipolar plate reaches 70% at a high current density of 300 mA/cm², which is 6.5% higher than that of the CB/FG bipolar plate. The energy efficiency of the bipolar plate does not decrease significantly after 500 charge and discharge cycles, indicating that the bipolar plate has good rate capability and service life.