Battery cell, battery device and power-consuming device

Abstract

Battery cell, comprising the following: a case; and an electrode assembly located in the housing, wherein the electrode assembly comprises a cathode foil, an anode foil and a separator, the separator being located between the cathode foil and the anode foil, where The cathode foil comprises a cathode collector and a cathode film layer located on at least one side of the cathode collector, wherein the cathode film layer comprises an active cathode material, the active cathode material comprising a lithium transition metal oxide, the lithium transition metal oxide comprising a nickel element, the molar fraction of the nickel element in the transition metal element of the lithium transition metal oxide being more than 80%, and wherein the porosity of the cathode film layer is 13% to 20%, and the density of the cathode film layer is 3.4 g / cm³ 3 up to 3.7 g / cm³ 3amounts; wherein the anode foil comprises an anode collector and an anode film layer located on at least one side of the anode collector, wherein the anode film layer comprises an active anode material, the active anode material comprising a silicon-based material and a carbon-based material, wherein the mass fraction of the Si element in the anode film layer is 1% to 10%, wherein the porosity of the anode film layer is 25% to 35%, and wherein the pressing density of the anode film layer is 1.55 g / cm³ 3 up to 1.8 g / cm³ 3 .

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