POUCH FOR SECONDARY BATTERY AND SECONDARY BATTERY INCLUDING THE SAME
Provided is a structure of a pouch which may be used in a high-capacity battery having high capacity and high stiffness, wherein the pouch may include an upper housing module which includes a metallic base plate having a concave-shaped accommodation space and polymer layers formed on one surface or both surfaces of the base plate, and a lower pouch sheet which is combined with a lower surface of the upper housing module to seal the accommodation space.
1 . A pouch for a secondary battery, the pouch comprising:
an upper housing module which includes a metallic base plate having a concave-shaped accommodation space, and a polymer layer formed on one surface or both surfaces of the base plate; and
a lower pouch sheet which is combined with a lower surface of the upper housing module to seal the accommodation space.
2 . The pouch for a secondary battery of claim 1 , wherein the polymer layer is a reinforcing layer formed of any one selected from the group consisting of cast polypropylene (CPP), polyethylene (PE), polypropylene (PP), urethane, polyethylene terephthalate (PET), polyimide (PI), Nylon, and a combination thereof, or a mixture of two or more thereof.
3 . The pouch for a secondary battery of claim 2 , wherein the reinforcing layer comprises:
a first reinforcing layer which is formed of a material selected from the group consisting of CPP, urethane, PET, PI, Nylon, and a combination thereof on an outer surface of the base plate, that is the opposite side of the accommodation space with respect to the accommodation space of the base plate; and
a second reinforcing layer which is formed in a structure in which one or more layers of a material selected from the group consisting of PE, PP, and a combination thereof are stacked on an inner surface of the base plate facing the accommodation space.
4 . The pouch for a secondary battery of claim 3 , wherein the second reinforcing layer formed on the inner surface of the base plate is formed of at least two or more layers.
5 . The pouch for a secondary battery of claim 4 , wherein the second reinforcing layer is composed of a first material layer that is in contact with the inner surface of the base plate, and a second material layer formed on the first material layer,
wherein the first material layer is formed of a material having a higher melting point than the second material layer.
6 . The pouch for a secondary battery of claim 5 , wherein the first material layer is formed of a material having a 20° C. to 30° C. higher melting point than the second material layer.
7 . The pouch for a secondary battery of claim 1 , wherein the lower pouch sheet having a structure of sealing the accommodation space is formed of a material selected from the group consisting of an alloy of iron (Fe), carbon (C), chromium (Cr), and manganese (Mn), an alloy of Fe, C, Cr, and nickel (Ni), aluminum (Al), copper (Cu), an equivalent thereof, and a combination thereof.
8 . The pouch for a secondary battery of claim 1 , wherein the upper housing module further comprises integrated lead tabs in which tabs, which are respectively connected to electrodes of an electrode assembly that is accommodated in the accommodation space, are formed as an integrated structure.
9 . The pouch for a secondary battery of claim 8 , wherein a pair of the integrated lead tabs is formed on one side of the upper housing module.
10 . The pouch for a secondary battery of claim 8 , wherein each of a pair of the integrated lead tabs is formed on both one side and another side of the upper housing module.
11 . The pouch for a secondary battery of claim 1 , wherein the base plate has a thickness in a range of 0.12 mm to 0.3 mm.
12 . The pouch for a secondary battery of claim 1 , wherein the base plate is formed of any one selected from the group consisting of Al, Fe, steel use stainless (SUS), high density plastic, and a combination thereof.
13 . The pouch for a secondary battery of claim 1 , wherein the polymer layer stacked on the base plate has a thickness in a range of 80 μm to 200 μm.
14 . The pouch for a secondary battery of claim 1 , wherein the upper housing module has a thickness in a range of 0.2 mm to 0.5 mm.
15 . The pouch for a secondary battery of claim 1 , wherein the lower pouch sheet has a thickness in a range of 150 μm to 180 μm.
16 . A secondary battery formed by comprising an electrode assembly in the pouch of claim 1 .
17 . The secondary battery of claim 16 , wherein the electrode assembly is formed in a structure selected from the group consisting of a wound type structure, a stacked type structure, and a stacked/folded type structure.