The disclosure provides a primary battery and an electrode assembly thereof. The electrode assembly includes a separator, a positive electrode, and a negative electrode current collector. The separator has a positive electrode side and a negative electrode side opposite to each other. The positive electrode is located at the positive electrode side of the separator, and the positive electrode includes a positive electrode current collector and a positive electrode material. The negative electrode current collector is located at the negative electrode side of the separator. The electrode assembly does not include a negative electrode material before charging or activation.