Abstract: A resin composition according to the present invention is characterized by containing, with respect to 100 parts by mass of the thermoplastic, carbon fibers in a range of 2 parts by mass or more and 70 parts by mass or less and a silane coupling agent in a range of 0.3 parts by mass or more and 7 parts by mass or less.

Abstract: A resin molded body according to the present invention is a resin molded body to be provided on an outer periphery of one or more lithium-ion secondary battery cells including a safety valve or an exhaust hole such that at least the safety valve or the exhaust hole is covered, in which a thermal conductivity (measurement temperature: 50° C.) of the resin molded body measured by a steady state comparative-longitudinal heat flow method based on JIS H7903:2008 is less than 1.0 W/m·K, a thickness of a part of the resin molded body, the part covering the safety valve or the exhaust hole, is 0.5 mm or more and 10.0 mm or less, and a hardness of a surface of the resin molded body measured by Type D durometer based on JIS K7215 is 50 or more and 90 or less.