Energy Power Systems has proposed a mild hybrid battery that would use both lead-acid and lithium-ion chemistries. Some experts believe that lead-acid has a good chance to move into mild hybrid and micro-hybrid battery applications. (Source: Energy Power Systems)
Weight is a major issue. I have an electric mower that I modified so I could run from a battery pack and charge it with solar panels. Yes, a green lawn mower. It cost more than I will ever save in fuel, and the original 17AH SLA cells only last about three years. I repacked the mower with a 10AH NiMh that produces the same run time at about 1/3 the weight, a huge savings.
I only have one season in the NiMh pack, so I can't comment on life, but there is one downside. It's very easy to monitor the State Of Charge (SOC) for SLA cells, but impossible with NiMh. Since I charge with solar panels I have no way of knowing how much energy is going into the cells, so I had to add a Coulomb counter to monitor the charge. There are plenty of charge monitors on the market used for model aircraft and the like, but they have quiescent currents in the tens of mA range, not suitable when a cloudy day only yields that much from the panels, so I had to build my own monitor that idles in the uA range. Like I said, I'm never going to recoup the cost from fuel savings, but it's been a good learning experience.
So, from what I've learned, SLA is heavy, has a poor service life for a constant draw in the 1/2C range, but is very easy to monitor the SOC. The current NiMh technology is fairly light and handles a 1C draw very well, but you can't monitor the SOC very well.
Lead-acid batteries have lowest energy-to-weight and energy-to-volume designs, making them very big and heavy for the total amount of power that they can put out. But they do have a very high surge-to-weight ratio, which means that they have the capacity to deliver a big jolt of electricity all at once. This feature makes lead-acid battries perfect for applications that need a big, sudden surge of power, such as car starters.
Alternatives to the internal combustion engine. A dressed up older battery technology may help break through the difficulties. Or perhaps something else. So far it looks like lithium-ion will see some challenges.
If they could do something to improve the old technology that would be fantastic. Lead-acid is forgiving and easily remanufactured, but it's also heavy and has a poor life-cycle under constant use. It's great for starting cars, though.
Interesting story, Chuck. I think it's a bit early to count out lithium ion, especially with some new research in different chemistries. But with all the negative publicity and the current limitations of the technology, there is certainly room for another battery chemistry to take its place.
Some cars are more reliable than others, but even the vehicles at the bottom of this year’s Consumer Reports reliability survey are vastly better than those of 20 years ago in the key areas of powertrain and hardware, experts said this week.
As it does every year, Consumers Union recently surveyed its members on the reliability of their vehicles. This year, it collected data on approximately 1.1 million cars and trucks, categorizing the members’ likes and dislikes, not only of their vehicles, but of the vehicle sub-systems, as well.
A few weeks ago, Ford Motor Co. quietly announced that it was rolling out a new wrinkle to the powerful safety feature called stability control, adding even more lifesaving potential to a technology that has already been very successful.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.