Method for manufacturing case of battery module and case of battery module
A method for manufacturing a lower case of a battery module includes an extrusion molding operation in which a metal material is extruded to mold a cooling plate member and a sidewall member of a battery module; a forging operation in which an internal surface of the cooling plate member is pressed with a punch, having an edge of a lower end provided vertically to form an accommodation groove; and a forming operation in which an embossed piece, protruding to an external surface of the cooling plate member by forming the accommodation groove, is removed.
1. A case of a battery module, the case comprising:
a cooling plate member on which a plurality of secondary battery cells are seated, the cooling plate member being provided with an accommodation groove in which a delta fin portion of the secondary battery cells is accommodated; and
a sidewall member provided on an end of the cooling plate member,
wherein the accommodation groove is formed to have a square shape,
wherein a portion, in which a bottom surface of the accommodation groove and all side surfaces of the accommodation groove are connected to each other, is provided substantially vertically,
wherein the accommodation groove includes a plurality of accommodation grooves disposed at regular intervals, and
wherein at least two delta fin portions are accommodated in each of the plurality of accommodation grooves.
2. The case of claim 1 , wherein the portion, in which the bottom surface and the side surface of each of the plurality of accommodation grooves are connected to each other, is provided to have a radius of curvature of 0.2 mm or less.
3. The case of claim 1 , wherein each of the plurality of accommodation grooves is provided to have a depth smaller than or equal to 60% of a thickness of the cooling plate member.
4. The case of claim 1 , wherein the cooling plate member is provided to be integrated with the sidewall member.
5. The case of claim 4 , wherein a portion, in which the cooling plate member and the sidewall member are connected to each other, is provided to have a radius of curvature smaller than a thickness of the cooling plate member or the sidewall member.
6. The case of claim 4 , wherein a portion, in which the cooling plate member and the sidewall member are connected to each other, is provided to have a radius of curvature of 0.3 mm or less.