Sheath for enclosing a case of a secondary battery

摘要

A secondary battery includes an electrode assembly having first and second electrodes and a separator, a pouch type case for receiving the electrode assembly, and a sheath for enclosing outer sides of the case. The sheath can prevent damage to the pouch in electronic devices to which the secondary battery is applicable as an inner pack type.

主权项

1. A secondary battery comprising:
an electrode assembly comprising a first electrode plate, a second electrode plate, and a separator interposed between the first electrode plate and the second electrode plate; a case for receiving the electrode assembly; and a sheath for enclosing the case, the sheath having a sheet shape and including
a lower surface portion covering a lower surface of the case;a first side surface portion connected to one side edge of the lower surface portion and covering a first side portion of the case;a second side surface portion connected to the other side edge of the lower surface portion and covering a second side portion of the case;a first upper surface portion bounded by one end of the sheath, two side edges of the sheath and one side surface portion of the sheath connected to the first side surface portion of the sheath and covering a portion of the area of an upper surface of the case;a second upper surface portion bounded by one end of the sheath, two side edges of the sheath and one side surface portion of the sheath connected to the second side surface portion of the sheath and substantially covering the remaining area of the upper surface of the case; anda rear surface portion connected at an edge of the lower surface portion for covering a rear portion of the case,wherein the total area of the first and second upper surface portions of the sheath is approximately the same as the area of the upper surface of the case, and an end of the first upper surface portion is disposed adjacent to an end of the second upper surface portion on the upper surface of the case.