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Disclosed herein is a middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed suc

Disclosed herein is a middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells, and the battery pack case is further provided with beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force, the beads being constructed in an outwardly-protruding structure to allow the coolant to be uniformly introduced into the battery module from the coolant inlet port in the advancing direction of a fluid in a flow space (“inlet duct”) defined between the coolant inlet port and the battery module.

대표청구항 ▼

1. A middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant

1. A middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells, andthe battery pack case is further provided with beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force, the beads being constructed in an outwardly-protruding structure to allow the coolant to be uniformly introduced into the battery module from the coolant inlet port in the advancing direction of a fluid in an inlet duct defined between the coolant inlet port and the battery module. 2. The middle- or large-sized battery pack case according to claim 1, wherein the beads are constructed in a concavo-convex structure having a large length to width ratio, and the beads are arranged parallel to each other. 3. The middle- or large-sized battery pack case according to claim 1, wherein the beads have an outward height of 2 to 5 mm or equivalent to 10 to 30% of the vertical sectional height of the coolant inlet port. 4. The middle- or large-sized battery pack case according to claim 1, wherein the beads have an outward height of 3 to 4 mm or equivalent to 15 to 25% of the vertical sectional height of the coolant inlet port. 5. The middle- or large-sized battery pack case according to claim 1, wherein the inlet duct has a vertical height equivalent to 55 to 80% of the vertical height of an outlet duct. 6. The middle- or large-sized battery pack case according to claim 1, wherein the battery pack case is constructed in a structure in which the length of the battery pack case in the stacking direction of the battery cells is greater than the length of the battery pack case in the lateral direction of the battery cells, the beads are arranged parallel to the lateral direction of the battery cells, and the beads are not formed at a predetermined region of the inlet duct adjacent to the coolant inlet port. 7. The middle- or large-sized battery pack case according to claim 6, wherein the region where the beads are not formed has a length equivalent to 10 to 30% of the length of the inlet duct. 8. The middle- or large-sized battery pack case according to claim 1, wherein the battery pack case is constructed in a structure in which the length of the battery pack case in the stacking direction of the battery cells is greater than the length of the battery pack case in the lateral direction of the battery cells, the beads are formed at the battery pack case such that the beads are arranged parallel to the lateral direction of the battery cells, and the outward height of the beads at a predetermined region of the inlet duct adjacent to the coolant inlet port is gradually decreased toward the coolant inlet port. 9. The middle- or large-sized battery pack case according to claim 8, wherein the region where the outward height of the beads is gradually decreased has a length equivalent to 15 to 50% of the length of the inlet duct. 10. The middle- or large-sized battery pack case according to claim 1, wherein the battery pack case is constructed in a structure in which a suction fan is mounted in the coolant outlet port for forcibly moving the coolant, introduced through the coolant inlet port, to the coolant outlet port, after the coolant flows through the battery module. 11. A middle- or large-sized battery pack case in which a battery module having a plurality of stacked battery cells, which can be charged and discharged, is mounted, wherein the battery pack case is provided with a coolant inlet port and a coolant outlet port, which are disposed such that a coolant for cooling the battery cells can flow from one side to the other side of the battery module in the direction perpendicular to the stacking direction of the battery cells, andthe battery pack case is further provided with beads formed in a concavo-convex shape for improving the structural stability of the battery pack case against an external force, the interiors of the beads being filled with filling members or a plate-shaped member being mounted at the lower ends of the beads such that the flow of the coolant is not disturbed by the beads in the inlet duct. 12. A middle- or large-sized battery pack constructed in a structure in which a battery module is mounted in a middle- or large-sized battery pack case according to claim 1. 13. The middle- or large-sized battery pack according to claim 12, wherein the battery module includes a plurality of plate-shaped battery cells that can be charged and discharged. 14. The middle- or large-sized battery pack according to claim 13, wherein the battery cells are lithium secondary batteries. 15. A middle- or large-sized battery pack constructed in a structure in which a battery module is mounted in a middle- or large-sized battery pack case according to claim 11. 16. The middle- or large-sized battery pack according to claim 15, wherein the battery module includes a plurality of plate-shaped battery cells that can be charged and discharged. 17. The middle- or large-sized battery pack according to claim 16, wherein the battery cells are lithium secondary batteries.