Battery cooling device for vehicle

1. A battery cooling device for a vehicle for cooling a battery module composed of a plurality of battery cells, comprising:

a refrigerant plate that extends in arranged directions of the plurality of battery cells and includes a refrigerant flowing for cooling the plurality of battery cells; and

a coolant plate disposed to enable heat exchange with the refrigerant plate, and having a coolant flowing for liquefying a refrigerant evaporated by heat produced in the battery cells, wherein the refrigerant plate includes:

a first plate member disposed to enable heat exchange with the plurality of battery cells;

a second plate member disposed to enable heat exchange with the coolant plate; and

a refrigerant channel disposed between the first plate member and the second plate member, and having the refrigerant flowing in the refrigerant channel,

wherein the first plate member is disposed to be in contact with the plurality of battery cells, and the second plate member is disposed to be in contact with the coolant plate, and

wherein the first plate member includes a first corrugated part having ridges and grooves on a surface of the first plate member which is not in contact with the plurality of battery cells, and the second plate member includes a second corrugated part having ridges and grooves on a surface of the second plate member which is not in contact with the coolant plate, and the first corrugated part and the second corrugated part are spaced apart from each other at an interval corresponding to a width of the refrigerant channel.

2. The battery cooling device of claim 1 , wherein the first plate member and the second plate member are flat plates.

3. The battery cooling device of claim 1 , wherein the refrigerant channel includes a plurality of refrigerant heating channels in which the refrigerant is heated by heat exchange with the battery cells, and a plurality of refrigerant cooling channels in which the refrigerant is cooled by heat exchange with the coolant plate, each of the refrigerant heating channels and each of the refrigerant cooling channels being alternately disposed in the arranged directions of the battery cells.

4. The battery cooling device of claim 3 , wherein the refrigerant heating channel is disposed between the battery cells and the coolant plate to neighbor the battery cells, and the refrigerant cooling channel is disposed between the battery cells and the coolant plate to neighbor the coolant plate.

5. The battery cooling device of claim 1 , wherein cell covers supporting the plurality of battery cells and the refrigerant plate are in contact with each other via a first interface member made of a thermal interface material for filling a gap or a pore space between the cell covers and the refrigerant plate.

6. The battery cooling device of claim 1 , wherein the coolant plate and the refrigerant plate are in contact with each other via a second interface member made of a thermal interface material for filling a gap or a pore space between the coolant plate and the refrigerant plate.

7. The battery cooling device of claim 3 , wherein the refrigerant channel includes a plurality of refrigerant transfer channels, each of the plurality of refrigerant transfer channels being disposed between each of the plurality of refrigerant heating channels and each of the plurality of refrigerant cooling channels.

8. The battery cooling device of claim 3 , wherein the first corrugated part includes at least one fin that extends therefrom toward the refrigerant heating channel, and the second corrugated part includes at least one fin that extends therefrom toward the refrigerant cooling channel.

9. The battery cooling device of claim 8 , wherein the fin disposed on the first corrugated part and the fin disposed on the second corrugated part are joined on surfaces of the first corrugated part and the second corrugated part respectively by any one joining method selected among furnace brazing, resistance welding, ultrasonic welding, and laser welding.