Electrolyte solution, secondary battery, battery module, battery pack and driven device

Abstract

Secondary battery comprising an electrolyte solution, wherein the electrolyte solution comprises an organic solvent and an additive, wherein the organic solvent comprises a first organic solvent shown in Formula 1, in Formula 1 R1 and R2 are each independently of one of C1-C3 alkyl and C1-C3 haloalkyl; the additive comprises a first additive selected from one or more of compounds represented by Formula 2A and Formula 2B, in Formula 2A R21, R22, R23 and R24 are each independently of one of a single bond and methylene, in Formula 2B R31, R32, R33 and R34 are each independently of one of a single bond and methylene, and R4 is one of a single bond, -O-, C1-C3 alkyl, C1-C3 haloalkyl and C1-C3 oxaalkyl.