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Focus Electric Battery Designed to Withstand Winter Chill

March 01, 2011

DEARBORN, MI - Because of an advanced active liquid-heating system, the battery in the Ford Focus Electric provides additional power, longer range and is preconditioned after charging -- all in cold temperatures, according to Ford Motor Co.

"Batteries are similar to people as they both achieve maximum performance working under moderate, unchanged temperatures," said Sherif Marakby, Ford director of electrification programs and engineering. "Using a liquid-heated battery system allows Ford to keep the Focus Electric's battery at a moderate temperature and improve performance whether you are charging or driving in a cold climate."

Extreme temperatures can affect battery performance and reduce the range of electric vehicles. The range will not be impacted as much with a liquid-heated system compared to an air system, according to Ford. That's why the automaker will use an advanced active liquid-cooling and heating system to regulate the temperature of its lithium-ion battery packs, which are designed to operate under a range of ambient conditions.

"A liquid-heated battery can accept a charge faster from the regenerative braking that recaptures kinetic energy and sends it back to the battery, essentially providing longer range for the customer in real-world cold weather conditions," said Marakby. "Additionally, since acceleration in an electric vehicle comes from the power available in the battery, the customer will have more power available if the battery is warmer."

The use of active liquid heating also enables owners of the Focus Electric to automatically precondition battery pack temperature during daily recharging. While the vehicle is plugged in to the power grid, the vehicle system can warm up the battery on cold days.

"Even when you're parking in cold temperatures, as long as the vehicle is plugged in, you will warm up the battery," explained Marakby. "Basically, customers will have the capability they need right off the bat. They won't have to wait for the car to warm up."

On cold days, heated liquid warms the batteries, gradually bringing the system's temperature to a level that allows it to efficiently accept charge energy and provide enough discharge power to get good vehicle performance.

"Focus Electric wasn't built just for consumers in warm cities with consistent temperatures," said Marakby. "We want our customers to know they can count on their electric vehicle whether they live in a cold or warm climate."

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