A suppression element includes a passivation composition supplier and a polar solution supplier. The passivation composition supplier is capable of releasing a metal ion (A), selected from a non-lithium alkali metal ion, an alkaline earth metal ion or a combination thereof, and an aluminum etching ion (B). The polar solution of the polar solution supplier carries the metal ion (A) and the aluminum etching ion (B) to an aluminum current collector to etched through thereof, and the metal ion (A) and the aluminum ion, generated during the etching, are seeped into the electrochemical reaction system. Then, the positive active material is transferred to a crystalline state with lower electric potential and lower energy, and the negative active material is transferred y to an inorganic polymer state with higher electric potential and lower energy to prevent the thermal runaway from occurring.