LITHIUM ION BATTERY, RELATED BATTERY MODULE AND BATTERY PACK THEREOF, AND DEVICE

This application relates to lithium-ion batteries and related battery modules, battery packs and devices. Specifically, the lithium-ion battery includes a positive electrode plate, a negative electrode plate, an electrolyte, and a separator, wherein the positive electrode plate includes aluminum foil as a positive electrode current collector, and a content of element copper atom as an impurity per unit area of the aluminum foil is from 0.009 g/m to 0.021 g/m, and the electrolyte contains first lithium salt and additive A, and the first lithium salt is a fluorine-containing sulfonimide lithium salt, and relative to total molar amount of lithium salt in the electrolyte, the fluorine-containing sulfonimide lithium salt has a molar amount of 30 mol% or higher; and the additive A is at least one of a phosphate compound containing an unsaturated bond, a cyclic compound containing a -SO- bond and a silicon-oxygen compound containing an unsaturated branch chain.