The application relates to the technical field of batteries, in particular to a battery insulation component, a battery cover plate
assembly and a battery. The battery insulation component is formed with a
liquid injection groove which protrudes along a first preset direction and towards the side of a pole group, a side wall of the
liquid injection groove along a second preset direction is formed with a plurality of
layers of auxiliary flow-through notches, the plurality of
layers of auxiliary flow-through notches are sequentially arranged along the first preset direction, each layer of the auxiliary flow-through notches comprises at least one auxiliary flow-through notch, and any auxiliary flow-through notch is in communication with the inside and outside of the
liquid injection groove. It can be seen that the auxiliary flow-through notches are arranged on the side wall of the liquid injection groove,
electrolyte no longer directly hits the battery pole group during the liquid injection process, thereby avoiding damage to the battery pole group, and the plurality of
layers of auxiliary flow-through notches also help to improve the exhaust efficiency of a formation process.