Battery cell, battery device and power-consuming device

Abstract

Battery cell comprising an electrode assembly and an electrolyte solution, wherein the electrode assembly comprises a positive electrode plate, a separator and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer arranged on at least one side of the positive electrode current collector, and wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer arranged on at least one side of the negative electrode current collector, wherein the positive electrode active material layer comprises a lithium-containing phosphate with an olivine structure, and wherein the one-sided coating weight of the positive electrode active material layer is 250 mg / 1540.25 mm² to 320 mg / 1540.25 mm²;wherein the electrolyte solution comprises a carboxylic acid ester solvent and a silyl group-containing additive, wherein the mass fraction of the carboxylic acid ester solvent in the electrolyte solution is 8% to 30%, the silyl group-containing additive comprises one or more of tris(trimethylsilyl) phosphate, tris(trimethylsilyl) borate and trimethylfluorosilane, and the mass fraction of the silyl group-containing additive in the electrolyte solution is 0.05% to 1%.