Patent ID: 8652675

Claim:
A cooling structure of a lithium ion secondary battery system, comprising: cooling channels for lithium battery unit cells accommodated by a laterally partitioned arrangement of main frames, each having a heat radiation part and lattice-shaped paths, and partitioning frames, and allowing air, blown by a cooling fan, to cool the lithium battery unit cells while passing through the cooling channels and the lattice-shaped paths, wherein each of the main frames has a pair of passage slots formed in both sides thereof to allow the air blown by the cooling fan to be directly blown to each accommodated lithium battery unit cell, thus forming a secondary cooling channel communicating with the pair of passage slots, wherein the secondary cooling channel is formed when the main frame and the corresponding partitioning frame are arranged in a partitioned arrangement structure, wherein the pair of passage slots is formed in center lines of the sides of the main frame, thus forming the secondary cooling channel, and wherein the passage slots forming the pair have one tapered section which is gradually narrowed along a longitudinal direction of the secondary cooling channel and another section is parallel along the longitudinal direction of the secondary cooling channel.