Ube Maxell Co., Ltd. is a Japanese company that manufactures separator base films and coated separators for lithium-ion batteries. Headquartered in Kyoto, it was established in 2011 as a joint venture between UBE Corporation and Maxell, Ltd. The company operates production facilities including at Sakai Works, where it is constructing additional capacity for separator base film using a dry process. Its products support automotive applications such as hybrid vehicles and non-automotive uses including energy storage systems. Plans include phased expansions starting in fiscal 2026 to increase overall production capacity by approximately 50 percent.
Also known as 宇部マクセル京都株式会社 and Ube Maxell Kyoto Co., Ltd..
New Sakai Works facility will boost separator base‑film output ~50% with phase‑one in FY2026 and phase‑two in FY2029; complements a facility due in fall 2026 to serve automotive and ESS demand.
