本文针对锂离子电池隔膜制造中的双向同步拉伸工艺展开研究，提出了一种纵向-横向可调式双向同步拉伸机设计方案。通过对比分步拉伸、一代同步拉伸及二代同步拉伸工艺的性能差异，明确了双向同步拉伸技术在能耗、运行稳定性、产品性能等方面的优势。结合实验数据与理论计算，验证了拉伸比（纵向：1∶3.8～1∶5，横向：1∶3～1∶7）、温度（112～117℃）及拉伸速率（5%～50%）对隔膜孔隙率、透气性和机械性能的影响规律。研究结果表明，该设备可实现无接触拉伸，适应多种特种薄膜生产。在生产线中，一台双向同步拉伸设备即可完成纵向拉伸和横向拉伸两台设备的工作，综合能耗较传统设备大幅降低，为锂电隔膜的高效制备提供了技术支撑。

In this paper, the bidirectional synchronous stretching process in the manufacture of lithium-ion battery separators is studied, and a design scheme of MD-TD adjustable bidirectional synchronous stretching machine is proposed. Through the performance differences of the first-generation synchronous stretching process, the first-generation synchronous stretching process and the second-generation synchronous stretching process, the advantages of bidirectional synchronous stretching technology in terms of energy consumption, operation stability and product performance are clarified. Combined with experimental data and theoretical calculations, the effects of tensile ratio(MD: 1∶3.8～1∶5, TD: 1∶3～1∶7), temperature(112～117 ℃) and tensile rate(5%～50%) on the porosity, air permeability and mechanical properties of the separator were verified. The results show that the equipment can achieve non-contact stretching, adapt to the production of a variety of special films. In the production line, a single bidirectional synchronous stretching device can perform the functions of two separate machines for longitudinal and transverse stretching, resulting in significantly lower comprehensive energy consumption compared to traditional equipment. This provides technical support for the efficient preparation of lithium-ion battery separators.