Abstract: A heat sink of a battery cell for electric vehicles and a battery cell module using the heat sink are provided to prevent deterioration of battery cells by effectively emitting heat generated from the battery cells. The battery cells are arranged at predetermined intervals and connected in parallel or series to each other. Each of the heat sinks is arranged between the battery cells and radiates heat generated from the battery cells. Each heat sink includes a heat-radiating case attached to at least one side of each battery cell and filled with a first refrigerant, and a second refrigerant circulating pipe arranged in the heat-radiating case and configured to circulate a second refrigerant for cooling the first refrigerant. A first refrigerant filled in the heat-radiating case may also be circulated for a heat exchange.

Abstract: A method of manufacturing an oil cooler for an automatic transmission includes: forming an inner pipe and an outer pipe, welding the plate and cutting the pipe; forming a boss using a cold forged rod; forming a brazing washer; forming a flow hole in both ends of the outer pipe and pass oil through the flow hole; compressing and fixing the brazing washer and the boss; forming a heat radiation fin; assembling the outer pipe in which the boss is fixed, the heat radiation fin plated with copper, and the inner pipe; sequentially expanding the inner pipe at its both ends in the radial direction; closely contacting the heat radiation fin with the inner pipe and the outer pipe; mounting brazing rings in the both expanded ends of the inner pipe and mounting a workpiece of the oil cooler in a brazing jig.