Cylindrical battery cell including can made of different kinds of metals

A cylindrical battery cell, comprising:

• an electrode assembly, having a structure in which a positive electrode and a negative electrode are wound in a state in which a separator is interposed between the positive electrode and the negative electrode, and mounted in a cylindrical can in a state of being impregnated with an electrolytic solution,
• wherein an inner layer and an outer layer, each of which is made of stainless steel, are formed in at least a portion of the cylindrical can,
• wherein a reinforcement layer is interposed between the inner layer and the outer layer, the reinforcement layer being made of a different metal than the inner layer and the outer layer,
• wherein a structure comprising the inner layer, the reinforcement layer, and the outer layer is formed at a side part and a lower end part of the cylindrical can, and
• wherein the reinforcement layers formed respectively at the side part and the lower end part of the cylindrical can are made of different kinds of metals.

A cylindrical battery cell, comprising:

• an electrode assembly, having a structure in which a positive electrode and a negative electrode are wound in a state in which a separator is interposed between the positive electrode and the negative electrode, and mounted in a cylindrical can in a state of being impregnated with an electrolytic solution,
• wherein an inner layer and an outer layer, each of which consists essentially of stainless steel, are formed in at least a portion of the cylindrical can,
• wherein a reinforcement layer is interposed between the inner layer and the outer layer, the reinforcement layer being made of a different metal than the inner layer and the outer layer,
• wherein a structure comprising the inner layer, the reinforcement layer, and the outer layer is formed at a side part and a lower end part of the cylindrical can, and
• wherein the reinforcement layers formed respectively at the side part and the lower end part of the cylindrical can are made of different kinds of metals.

A cylindrical battery cell, comprising:

• an electrode assembly, having a structure in which a positive electrode and a negative electrode are wound in a state in which a separator is interposed between the positive electrode and the negative electrode, and mounted in a cylindrical can in a state of being impregnated with an electrolytic solution,
• wherein an inner layer and an outer layer, each of which consists essentially of stainless steel, are formed in at least a portion of the cylindrical can,
• wherein a reinforcement layer is interposed between the inner layer and the outer layer, the reinforcement layer being made of a different metal than the inner layer and the outer layer, and
• wherein micro-scale concave and convex units for providing joint frictional force are formed on an inner surface of the inner layer of the cylindrical can and on one surface of the reinforcement layer that faces the inner layer of the cylindrical can.