Heater for EVs stores energy generated by braking

2nd July 2014
Staff Reporter

The introduction of a high voltage recuperation heater, the REOHM BWD330, has brought significant efficiency improvements to the vehicle thermal management systems used in electric vehicles. The heater, introduced by REO, reduces energy consumption and offers increased cooling efficiency during emergency braking.

Until recently, electric vehicles have had to use electrical energy for heating both the cabin and the batteries during winter. This results in a diminished battery life which increases running costs and detracts from the potential maximum range. The BWD330 minimises this dependency on the battery by using the energy generated from the act of braking, which is stored and reused for heating as and when required. Lower energy consumption means that carbon emission targets can be met.

"Electric vehicle manufacturers can also realise significant savings with the BWD330, because 66% less installation space is required compared to standard units," explained Steve Hughes, managing director of REO. "We've also reduced volume by 85% and weight by 76%. All of this results in a unit which weighs less than 10kg with a rating of 420-450V DC and a maximum braking power rating of 60kW.

"Despite making such drastic improvements, we've maintained high levels of safety. In the event of drive system failure, the BWD330 can discharge the DC link, which will dissipate unwanted power safely."


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