Ultracapacitors also enable automotive manufacturers to answer safety and performance critiques by reliably completing a million or more charge-discharge cycles in all weather conditions, without having to be replaced. Hybridized energy storage and power delivery solutions with both ultracapacitors and batteries enhance the performance of hybrid and electric vehicles by meeting the electrical power demands of acceleration, power steering, electrical systems, and starter systems, and they play a significant role in start-stop and regenerative braking systems solutions.
Ultracapacitors can absorb and store essentially all the kinetic energy from a braking system. Their efficiency and power capability add up to more efficient recapture of braking energy. This energy is then available to help in acceleration to decrease fuel consumption and associated emissions.
In full hybrid or electric vehicles, ultracapacitors can lessen battery drain and prolong battery life. This regenerative braking solution takes most of the load off mechanical brakes, reducing brake maintenance and replacement expenses. Ultracapacitors can also complement batteries in start-stop applications, which enable the engine in a conventional, electric, or hybrid-electric vehicle to shut down when it comes to a stop at a red light or when sitting in traffic. Ultracapacitors then provide a short burst of energy that restarts the motor.
With 100-percent reliability at temperatures from -40C to 65C, low lifecycle cost, and the ability to capture energy from regenerative braking, ultracapacitors provide a cost-effective energy solution to complement batteries and reduce fossil fuel dependency, significantly improve fuel economy over gasoline-only powered vehicles, and cut greenhouse gas emissions.
Interesting how ultracapacitors helps across the board on fuel savings, not just with electric power. It's good to see the pressure on reducing fuel consumption. It will be interesting to see if this trend holds when oil prices come down. With greater protection and a potential reduction in demand through efficiency, oil, prices should come down over the coming years.
I can follow the wonderful things ultracapacitors can do according to the article. The items listed sound logical and seem to be exiating technology. So why haven't we seen or heard about automakers doing these things? Are they married to battery makers? As far as gasoline prices going down when consumption does I don't think that will ever happen. If it does it will be in far, far distant future.
Good article which presents many good points. In addition to the previous question on why we haven't seen these earlier (cost/economic reasons?) it would also be interesting to know the weight per capacity tradeoff (i.e. larger capacitors can carry a larger charge, but are also heavier and can slow vehicle performance). How is the size of the capacitor optimized for each vehicle?
Anytime you have to start up a motor repeatedly a big cap is the way to go. Most of the time the expense of the capacitor precludes you from including it in the design, but an electric car is the perfect application. The Bill of Material cost just isn't as important as performance is. At least, for now.
I have gotten to use super capacitors in an application where battery life was very important.
It will be interesting to see how they manage surge currents. Unlike a battery where the voltage drops considerably when a near dead short occurs as a starter engages, ultra capacitors will instantly pump near infinite current. They'll need to have a very robust wiring and electrical contact switching system to handle this.
The article doesn't address the size of cap needed for this. Let's say we have 1000F. The delta V ov the cap is say 100V on top of the normal 380V rail. This contains enough energy to power a 50Kw motor for 100 sec. assuming everything 100% efficient. While this would fill gaps for accelleration/decelleration, How big and heavy is a 1000F cap rated at say 600V?
Jim, I tend to agree with your statements, but there is so much more that is not disclosed by the author. This is more of a puff piece than what I would expect in something published by engineers for engineers. What is the basic technology? What are the tradeoffs? I remember the earliest ultracaps (just a few years ago) were very low voltage (a few volts WVDC at best) and had an absurdly high internal resistance. What allows these units to be described as essentially lossless? Without some hard information and checkable references, this could easily be pie in the sky!
To get to a trillion sensors in the IoT that we all look forward to, there are many challenges to commercialization that still remain, including interoperability, the lack of standards, and the issue of security, to name a few.
From design feasibility, to development, to production, having the right information to make good decisions can ultimately keep a product from failing validation. The key is highly focused information that doesn’t come from conventional, statistics-based tests but from accelerated stress testing.
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