Battery cover plate assembly, single cell battery, battery module, power battery pack, and electric car

A battery cover plate assembly, comprising a cover plate, an electrode terminal, a current interrupt structure, and an arc extinguishing portion formed as an arc extinguishing coating applied to a surface of the current interrupt structure, wherein:

• the electrode terminal is disposed on the cover plate and comprises an electrode inner terminal and an electrode outer terminal;
• the electrode inner terminal and the electrode outer terminal are electrically connected through the current interrupt structure;
• the current interrupt structure is cut off under the action of a gas pressure to disrupt an electrical connection between the electrode inner terminal and the electrode outer terminal under an action of the gas pressure;
• the arc extinguishing portion extinguishes an electric arc generated when the current interrupt structure disrupts the electrical connection between the electrode inner terminal and the electrode outer terminal;
• 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 disrupt the electrical connection under the action of the gas pressure;
• and
• the arc extinguishing coating comprises a first coating applied to a first surface of the flipping member, and a second coating applied to a second surface of the conductive member, the first surface faces the conductive member and the second surface faces the flipping member.