In order to curb the negative consequences of climate change, politicians have been calling for a reduction in carbon dioxide emissions for some time now. This also affects the automotive industry, which is relying on technological innovations to reduce emissions of gases that are harmful to the climate. Battery manufacturer moll, based in bad staffelstein, germany, is providing a building block for this with a car battery that was developed to meet the new requirements of the automotive industry. This EFB (enhanced flooded battery) is specially designed for use in vehicles with automatic start-stop systems.
"In the past, car batteries were basically pure starter batteries", explains rainer wagner, who as technical director oversaw the three-year development of the new battery. The main task of the battery was to provide a cold start for the vehicle. However, with increasing electronics on board, especially since the 1990s, it has become more and more important that the car battery can survive many landing and discharging cycles.
"Cold-starting ability and cycle life are actually opposed to each other," says wagner, rainer wagner explains the basic problem in the development of the battery. With the push for micro-hybrid vehicles, which have automatic start-stop systems and regenerative braking, the demands on the car battery have increased even more. When a car with an automatic start-stop system stops, the engine switches off. "The engine speed is then at zero, and the battery has to supply the entire vehicle with power", says rainer wagner. This leads to a greater discharge of the battery.
Because of the higher load on the battery caused by this, the automotive industry had demanded that the cycle life be increased threefold. "We have achieved this with the EFB battery", says rainer wagner. Among other things, special additives in the lead paste of the battery have made it possible to achieve these improvements, explains sales manager martin mantel.
After intensive development work by the staffelstein-based company, EFB batteries have been installed in vehicles in series production since august, including the volkswagen golf VII. Martin mantel says he is particularly proud of the new golf model, which is after all the flagship of the wolfsburg-based automotive group.
The EFB battery was well received at a trade show in mid-september. "We had over 300 contacts at the trade show, the interest in the professional world is very rough", martin mantel is pleased. In the next few years, EFB technology will increasingly gain market share, especially as the batteries are now also available from specialist dealers for the spare parts market. Test series by other companies had also confirmed the quality of the new battery.
Rainer wagner does not see the end of the classic lead-acid battery for a long time yet. "With EFB technology, we have shown what is possible", says wagner, who sees further scope for innovation. Actually, says rainer wagner, the opinion was widespread among experts that it was not possible to triple the cycle time of a normal lead-acid battery. "Through a lot of work over the last three years, we have nevertheless managed to do it", says rainer wagner.