Calsonic Kansei Develops Water-cooling Plate for EV/HEV Batteries

May 27, 2013
Naoshige Shimizu, Nikkei Automotive Technology
The plate for cooling a battery. A heat exchanger is seen in the front.
The plate for cooling a battery. A heat exchanger is seen in the front.
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The back side of the plate
The back side of the plate
[ If it clicks, the expanded picture will open ]

Calsonic Kansei Corp developed a cooling plate in which water flows and exhibited it at Automotive Engineering Exposition 2013.

The cooling plate is placed under an automotive battery to cool it. The plate not only extends the life of an automotive battery but reduces energy consumption by enabling to use the heat from the battery for a heating system. The company aims to commercialize the plate in 2015.

The area of the plate is 800 x 300mm, and its thickness is 5.5mm. Cooling water flows in a 1.5mm-thick space between two 2mm-thick aluminum (Al) plates. Calsonic Kansei formed channels on two 3,000-series Al plate and attached them together with wax. The company made improvements to the temperature conditions for brazing to realize a flatness of 0.2mm.

With the channels whose height is as low as 1.5mm, the speed of cooling water is fast, improving cooling performance. The cooling performance of the new plate is as high as 800W/m2·K.

To run cooling water, a connector on the lower side of the cooling plate is connected with a hose. The water flowing through the hose passes through a heat exchanger, and its heat energy is exchanged with the refrigerant of a heating system.

Also, Calsonic Kansei has already developed a system that air-cools an automotive battery. For example, while the batteries of Nissan Motor Co Ltd's "Leaf" and Toyota Motor Corp's "Prius" are cooled with air, the battery of General Motors Corp's "Volt" is cooled with water.

"We will propose either of the water- and air-cooling systems, depending on the philosophy of each automaker," Calsonic Kansei said.