An electrode assembly is formed by winding a positive electrode plate, a separator, and a negative electrode plate that are stacked. The positive electrode plate includes a positive tab, a positive current collector, and a positive active material layer. A thickness of the positive current collector is T1, and a width of the positive current collector is W1. Along a first direction, a distance from the positive tab to a first termination end is A. Along a second direction, a distance from the positive tab to a first start end is B. The negative electrode plate includes a negative tab, a negative current collector, and a negative active material layer. A thickness of the negative current collector is T2, and a width of the negative current collector is W2. Along the first direction, a distance from the negative tab to the second termination end is C. Along the second direction, a distance from the negative tab to the second start end is D, satisfying: 0.8≤[A/(T1×W1)+D/(T2×W2)]/[B/(T1×W1)+C/(T2×W2)]≤1.2.