A battery cover plate assembly, comprising a cover plate (300, 400), an electrode terminal, a current interrupt structure, and an arc extinguishing portion (303, 403), wherein the electrode terminal is disposed on the cover plate (300, 400) and comprises an electrode inner terminal (301, 401) and an electrode outer terminal (302, 402), the electrode inner terminal (301, 401) and the electrode outer terminal (302, 402) are electrically connected through the current interrupt structure, the current interrupt structure is capable of disrupting the electrical connection between the electrode inner terminal (301, 401) and the electrode outer terminal (302, 402) under the action of a gas pressure, and the arc extinguishing portion (303, 403) is configured to reduce an electric arc generated when the current interrupt structure disrupts the electrical connection between the electrode inner terminal (301, 401) and the electrode outer terminal (302, 402), wherein the current interrupt structure is cut off under the action of the gas pressure to disrupt the electrical connection between the electrode inner terminal (301, 401) and the electrode outer terminal (302, 402), and the arc extinguishing portion (303, 403) is located on the current interrupt structure, to extinguish the electric arc generated when the current interrupt structure disrupts the electrical connection between the electrode inner terminal (301, 401) and the electrode outer terminal (302, 402), wherein the arc extinguishing portion (303, 403) is formed as an arc extinguishing coating applied to a surface of the current interrupt structure, wherein the current interrupt structure comprises a conductive member electrically connected to an outer end surface of the electrode inner terminal, and a flipping member connected between the conductive member and the electrode outer terminal, an outer peripheral edge of the flipping member is mounted on the cover plate in a sealed manner, the flipping member and the conductive member are capable of disrupting the electrical connection under the action of the gas pressure, and the arc extinguishing coating comprises a first coating applied to a surface, which faces the conductive member, of the flipping member, and a second coating applied to a surface, which faces the flipping member, of the conductive member, wherein the electrode inner terminal is preferably formed by a pole extending along an internal-external direction, and wherein the arc extinguishing coating further comprises a third coating applied to a surface, which faces the electrode outer terminal, of the flipping member. wherein the arc extinguishing portion (303, 403) is formed as an arc extinguishing coating applied to a surface of the current interrupt structure, wherein the current interrupt structure comprises a conductive member electrically connected to an outer end surface of the electrode inner terminal, and a flipping member connected between the conductive member and the electrode outer terminal, an outer peripheral edge of the flipping member is mounted on the cover plate in a sealed manner, the flipping member and the conductive member are capable of disrupting the electrical connection under the action of the gas pressure, and the arc extinguishing coating comprises a first coating applied to a surface, which faces the conductive member, of the flipping member, and a second coating applied to a surface, which faces the flipping member, of the conductive member, wherein the electrode inner terminal is preferably formed by a pole extending along an internal-external direction, and wherein the arc extinguishing coating further comprises a third coating applied to a surface, which faces the electrode outer terminal, of the flipping member.