LITHIUM ION SECONDARY BATTERY, BATTERY CELL, NEGATIVE ELECTRODE POLE PIECE, AND DEVICE CONTAINING LITHIUM ION SECONDARY BATTERY

The present disclosure provides a lithium ion secondary battery, a battery core, a negative electrode plate and an apparatus containing the lithium ion secondary battery. The lithium ion secondary battery includes a battery core and an electrolytic solution, the battery core including a positive electrode plate comprising a positive current collector and a positive active material layer disposed on a surface of the positive current collector, a separator, and a negative electrode plate comprising a negative current collector and a negative active material layer disposed on a surface of the negative current collector, wherein the positive current collector and/or the negative current collector are a composite current collector, the composite current collector comprises a polymer-based support layer and a conductive layer disposed on at least one surface of the support layer, and the composite current collector has a thermal conductivity in a range of 0,01 W/(m•K) to 10W/(m•K), preferably in a range of 0.1 W/(m•K) to 2W/(m•K).