Pouch-shaped battery case comprising heat dissipation layer
Disclosed herein is a pouch-shaped battery case configured to receive an electrode assembly having a separator interposed between a positive electrode and a negative electrode, the pouch-shaped battery case including an outer coating layer, an inner adhesive layer, and a metal barrier layer disposed between the outer coating layer and the inner adhesive layer, the metal barrier layer including a plurality of metal layers and a heat dissipation layer interposed between the metal layers.
1. A pouch-shaped battery case configured to receive an electrode assembly having a separator interposed between a positive electrode and a negative electrode, the pouch-shaped battery case comprising:
an outer coating layer;
an inner adhesive layer; and
a metal barrier layer disposed between the outer coating layer and the inner adhesive layer, the metal barrier layer comprising a plurality of metal layers and a heat dissipation layer interposed between the metal layers,
wherein the heat dissipation layer is made of metal and defines a net structure having openings formed therein at regular intervals in an array, and the openings in the heat dissipation layer are filled with an adhesive material.
2. The pouch-shaped battery case according to claim 1 , wherein the plurality of metal layers includes a first metal layer and a second metal layer, and wherein the first metal layer, the heat dissipation layer, and the second metal layer are sequentially stacked.
3. The pouch-shaped battery case according to claim 1 , wherein the adhesive material is at least one selected from a group consisting of: a polyester-based resin including polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polycarbonate, or copolymer polyester; a polyester-based adhesive; a polyurethane-based adhesive; an epoxy-based resin; a phenol-based resin; nylon 6, nylon 66, or nylon 12; a polyamide-based resin; a polyolefin-based resin including polyolefin, carboxylic acid-modified polyolefin, or metal-modified polyolefin; a polyvinyl-acetate-based resin; a cellulose-based adhesive; a (meth)acryl-based resin; a polyimide-based resin; an amino resin including a urea resin or a melamine resin; rubber including chloroprene rubber, nitrile rubber, or styrene-butadiene rubber; and a silicone-based resin.
4. The pouch-shaped battery case according to claim 1 , wherein the heat dissipation layer is made of a material that exhibits a thermal conductivity that is the same as a thermal conductivity of aluminum or a material that exhibits a thermal conductivity that is higher than the thermal conductivity of aluminum.
5. The pouch-shaped battery case according to claim 4 , wherein the heat dissipation layer is made of at least one selected from a group consisting of: aluminum (Al), beryllium (Be), copper (Cu), silver (Ag), and gold (Au).
6. The pouch-shaped battery case according to claim 2 , wherein the first metal layer and the second metal layer are coupled to each other through the heat dissipation layer.
7. The pouch-shaped battery case according to claim 1 , wherein the inner adhesive layer comprises a first inner adhesive layer and a second inner adhesive layer.
8. The pouch-shaped battery case according to claim 7 , wherein
a first surface of the first inner adhesive layer is located adjacent to the metal layer, the first inner adhesive layer being made of acidified polypropylene (PPa), and
the second inner adhesive layer is located adjacent to a second surface of the first inner adhesive layer opposite from the first surface, the second inner adhesive layer being made of polypropylene (PP).
9. The pouch-shaped battery case according to claim 1 , wherein the outer coating layer comprises a first outer coating layer and a second outer coating layer.
10. The pouch-shaped battery case according to claim 9 , wherein
the first outer coating layer is an outermost layer of the pouch-shaped battery case, the first outer coating layer being made of polyethylene terephthalate (PET), and
the second outer coating layer is a layer that is located between the first outer coating layer and the metal layer, the second outer coating layer being made of oriented nylon.
11. The pouch-shaped battery case according to claim 1 , wherein the plurality of metal layers comprises three or more metal layers, the heat dissipation layer is a first heat dissipation layer, and a plurality of heat dissipation layers including the first heat dissipation layer are disposed between the three or more metal layers.
12. The pouch-shaped battery case according to claim 1 , further comprising:
an adhesive layer interposed between the metal barrier layer and the outer coating layer, and
an acidified-polypropylene layer coupled to a surface of the metal barrier layer that faces the adhesive layer.
13. A pouch-shaped secondary battery comprising a pouch-shaped battery case according to claim 1 .