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 separating film 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, 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 negative electrode active material layer comprises graphite particles, wherein the volume-averaged particle size Dv50 of the graphite particles is 8.5 µm to 13.5 µm;wherein a quantity A of the interstitial electrolyte solution in the battery cell satisfies the following: A = AT - A1 - A2 - A3, where 0.5 g / Ah ≤ A ≤ 1.4 g / Ah; where AT denotes a quantity of the electrolyte solution in the battery cell in g / Ah; where A1 denotes a quantity of the electrolyte solution in the positive electrode active material layer in g / Ah; where A2 denotes a quantity of the electrolyte solution in the negative electrode active material layer in g / Ah; where A3 denotes a quantity of the electrolyte solution in the separating film in g / Ah; wherein the electrolyte solution comprises ethylene carbonate, wherein a mass fraction of the ethylene carbonate in the electrolyte solution is 20% to 35%; wherein the electrolyte solution further comprises an unsaturated ester additive, wherein a mass fraction of the unsaturated ester additive in the electrolyte solution is 0.05% to 6% is; wherein the unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and fluorinated carbonate additives.;