Secondary battery including insulation member having multiple thicknesses

A secondary battery comprising:

• an electrode assembly;
• a case accommodating the electrode assembly;
• a lead member outwardly extending from the electrode assembly to outside of the case;
• and
• an insulation member at least partially covering the lead member and having varying thicknesses,
• wherein the insulation member has an exterior portion that is located outside the case and an interior portion that is located inside the case, wherein the exterior portion of the insulation member includes a first part extending outwardly from the interior portion and having a first thickness and a second part extending outwardly from the first part and having a second thickness less than the first thickness,
• wherein the insulation member comprises a first portion disposed on the lead member and a second portion disposed on the first portion, wherein each of the first and second portions forms part of the interior portion and part of the exterior portion, and wherein the entirety of the second portion of the insulation member is arranged outside the electrode assembly so as to be spaced apart from the electrode assembly
• wherein each of the first and second portions has an inner end arranged inside the case, wherein the inner end of the first portion is aligned with the inner end of the second portion in a depth dimension of the case, and wherein the lead member extends inwardly to the electrode assembly beyond the inner ends of the first and second portions without being covered by an insulating layer.

A secondary battery comprising:

• an electrode assembly;
• a case accommodating the electrode assembly;
• a lead member outwardly extending from the electrode assembly to outside of the case;
• and
• an insulation member at least partially covering the lead member and having a stepped structure,
• wherein the insulation member has an exterior portion that is located outside the case and an interior portion that is located inside the case, wherein the exterior portion of the insulation member includes a first part extending outwardly from the interior portion and having a first thickness and a second part extending outwardly from the first part and having a second thickness less than the first thickness,
• wherein the insulation member comprises a first portion disposed on the lead member and a second portion disposed on the first portion, wherein each of the first and second portions forms part of the interior portion and part of the exterior portion, and wherein the entirety of the second portion of the insulation member is arranged outside the electrode assembly so as to be spaced apparat from the electrode assembly,
• wherein each of the first and second portions has an inner end arranged inside the case, wherein the inner end of the first portion is aligned with the inner end of the second portion in a depth dimension of the case, and wherein the lead member extends inwardly to the electrode assembly beyond the inner ends of the first and second portions without being covered by an insulating layer.