A lithium-ion battery includes a cell including N battery unit, and at least one negative electrode lithium replenishing agent film that includes an independent lithium replenishing electrode including a current collector and a first metal lithium layer disposed on the current collector, or includes a second metal lithium layer laminated on a surface of a negative electrode material layer. An areal density σ of the metal lithium layer and a parameter θ satisfy certain relationships. Each of the N battery units includes a positive electrode plate, a negative electrode plate, and a separator sandwiched between the positive electrode plate and the negative electrode plate. The positive electrode plate comprises a positive electrode current collector and a positive electrode material layer disposed on the positive electrode current collector. The negative electrode plate includes a negative electrode current collector and a negative electrode material layer disposed on the negative electrode current collector.