Battery cover plate assembly, battery and battery pack

Abstract

Battery cover plate assembly, characterized in that it comprises: a cover plate body (1) provided with an installation hole (11); a rupture disc (2) arranged in the installation hole (11) and completely covering the installation hole (11); wherein the rupture disc (2) serves to release the pressure as soon as a certain air pressure is reached inside the battery; a projection (3) the one end of which is connected to the cover plate body (1) and which is arranged on a side facing away from the rupture disc (2); wherein the projection (3) extends in a direction perpendicular to the cover plate body (1) and forms a side wall (32) and a bottom wall (31); wherein the projections of the projection (3) and the rupture disc (2) overlap at least partially; wherein a pressure relief hole is provided at least in the bottom wall (31) and / or the side wall (32);and a buffer cavity (4) enclosed by the side wall (32), the bottom wall (31) and the bursting disc (2).