Battery cell, method and system for manufacturing battery cell, battery, and electrical device

A method for manufacturing a battery cell, comprising:

• providing a housing, wherein the housing comprises an opening and a first side plate, and a pressure relief mechanism is disposed on the first side plate;
• providing a support member, wherein a duct is disposed in the support member;
• providing an electrode assembly;
• providing a cover assembly, wherein the cover assembly comprises an end cap and an insulation piece, the insulation piece is located on a side of the end cap that faces the electrode assembly, the end cap and the insulation piece fit snugly to form a first recess away from the cover assembly, and the first recess accommodates at least a part of the electrode assembly:
• connecting the cover assembly to the electrode assembly;
• and
• placing the support member and the electrode assembly into the housing, and fitting the cover assembly onto the opening,
• wherein,
• the first side plate and the cover assembly are located on two sides of the electrode assembly along a first direction respectively;
• the support member is disposed between the electrode assembly and the first side plate, and configured to support the electrode assembly,
• the support member has a first surface facing the first side plate, and a second surface facing the electrode assembly, at least one support portion protrudes from the first surface, so
• that the duct is formed between the support member and the first side plate, the duct is configured to guide gas between the cover assembly and the support member into the pressure relief mechanism, so that the pressure relief mechanism is actuated to release a pressure when the pressure reaches a threshold;
• and
• wherein the insulation piece comprises a first body and a first bulge, the first body comprises a first inner surface and a first outer surface opposite to each other, the first inner surface faces the electrode assembly, the first bulge is disposed protrusively on the first outer surface, and the first recess is formed on a side of the first bulge that faces the electrode assembly, and sinks against the first inner surface;
• and
• a fourth recess is formed on a side of the end cap that faces the electrode assembly, and the fourth recess is configured to accommodate the first bulge.