沧州明珠：公司生产的隔膜产品主要应用于锂离子电池，产品已进入国内外主流电池企业

Group 1 - The company, Cangzhou Mingzhu (002108.SZ), confirmed its role as a supplier of battery separators to Samsung SDI, indicating a long-term partnership [2] - The company's separator products are primarily used in lithium-ion batteries and have been integrated into major domestic and international battery manufacturers [2]