A tremor ran through the cutting- edge electric car industry last month. Mathieu Tenenbaum, working with French automaker Renault, was just another faceless name till then. But one espionage story that hit the newsstands made him infamous in a single stroke.
Tenenbaum was sacked for spying. Not that he had leaked a closely guarded nuclear secret. It was a mere battery that unleashed high drama in the fiercely competitive world of electric cars.
According to newspaper reports, the French intelligence agencies pointed towards China charging it with stealing the battery technology. Beijing was quick to deny it. Renault did not reveal what had been leaked, but did say it was a huge relief for the company that technical details of its battery technology were safe. Renault and its Japanese affiliate Nissan are spending a whopping US $5 billion to develop electric vehicles that run on batteries.
Not surprising then that the auto major had panicked fearing that the company’s crucial and secret details, vital for its growth, had been let out.
Renault-Nissan has staked its future on the success of battery and its ability to power a vehicle. The joint venture’s CEO Carlos Ghosn has claimed that by 2020, zero-emission, battery-powered vehicles will comprise 10 per cent of the global car market.
The espionage story has laid bare the fact that battery technology in the electric car industry has the potential to pay huge dividends.
Just a month before the story broke, Nissan launched its electric car Leaf. Powered by a 24-kilowatt per hour battery pack, it claims to run about 160 km after being charged once with a top speed of about 145 km per hour.
Leaf has been voted the 2011 European Car of the Year, an award established in 1964 by a collective of automobile magazines.
In the United States, after accounting for subsidy, it costs around $25,000. But this is expensive compared to petrol vehicles. That is why even a small breakthrough in the technology will hugely benefit the industry.
The global battery market, valued at US $100 billion, is projected to grow at 4.8 per cent by 2014, according to Freedonia Group, a publisher of market research reports.
Whats and hows
Batteries today don’t just power vehicles, but dictate how we communicate, read, listen to music, commute, back up our data, adopt green technologies and overcome power cuts.
A battery comprises two electric conductors (electrodes) connected by an electrolyte, the medium for transfer of ions. This produces a flow of current converting chemical energy to electrical power. There are three most common families of batteries—lead-acid, lithium and nickel. Lead-acid is the oldest rechargeable battery and promises to remain in the market for years to come. Its cell contains electrodes of elemental lead and lead oxide in an electrolyte of dissolved sulphuric acid. This battery is heavy because lead has low electrochemical potential. It is, therefore, used mostly in bulky or stationary devices.
At the forefront of battery revolution is lithium-ion 18650, which makes possible a casing of just 18 mm diameter and 65 mm length. Being the lightest metal and the least dense solid element, lithium makes the battery pack portable. It is used in cell phones and laptops. Many companies are now trying it out in electric cars.
Nickel metal hydride has been used in electric cars such as Toyota Prius, but it is double the weight of a lithium battery. Nickel cadmium, once used to power cell phones and laptops, has been replaced by lithium-ion after concern was raised over cadmium’s toxicity.
Indian scene
Lead-acid market in India is valued at Rs 20,000 crore and is growing at 15 to 20 per cent per year. This is the strongest sales growth of any national market. Invented by French physicist Gaston Plante in 1859 (see ‘History of the battery’), the lead-acid battery is here to stay. “It will continue to dominate for the next 20 years,” said L Pugazenthy, executive director of the India Lead Zinc Development Association.
Used in heavy duty vehicles such as cars, tractors and forklifts, it is now common in households. Power cuts have made inverters and battery backup a lucrative industry. It continues to provide power to critical operations like air-traffic control towers, hospitals, rail- road crossings, military installations, submarines and weapons systems. Telephone connectivity, too, is uninterrupted because telecom companies use lead-acid battery as back-up.
“It would be very difficult to replace lead-acid as it has one basic advantage— low cost. The process of refine, reuse and recycle is also fairly simple,” said A Chakrabarty, battery expert and former technical head of Exide, India’s largest battery maker.
|
Life has no free lunches. More so, when a rapidly growing population wants to somehow bite into the limited pie of resources. This mad scramble has made measurement of who uses how much all the more vital. It is for this reason that utility managers are investing in meters that give precise readings. The focus is on improved electricity and water meters. Finding solutions to reduce errors will help utilities avoid the vicious cycle of poor service and low revenue generation.
Electricity meters
Not long ago, power utility companies were a harried lot as most consumers tampered with meters. If tilted in a particular direction, the meter would stop reading. Resting a magnet on top would also tinker with the readings. The utilities incurred 40 to 50 per cent of revenue loss due to this.
This was the electromechanical meter that works on an aluminium disc and two coils. The coils produce tiny currents in the disc which rotates. But giving discomfort to the consumer is its reading that shows a two-per cent error. If the meter is tampered with, utility managers have no way to prove it since the meter cannot register past data.
To counter this and check tampering, the electromagnetic meter was introduced, said Pradip Ranjan Dutt, Indian representative of Landis and Gyr, the largest global player in electricity metering. Its reading shows less than one per cent error, which meets the standard set by the Central Energy Regulatory Commission.
In fact, any digital signal processing system gives superior accuracy. Its memory also helps give past details. An in-built deterrent checks tampering by use of magnets. Instead of running slow, the magnet speeds up the meter.
Electromagnetic meters are also far more sensitive. They read even the television sets put on stand-by mode and the zero-Watt bulbs used at night. “It can record very low current such as 10 milli ampere,” said V N Nanda Kumar, additional director with Bengalurubased Central Power Research Institute, an autonomous testing facility under the Union power ministry.
Delhi phased out the antiquated meters in 2002 and gave electromagnetic meters to 2.72 million households. The new meters are being installed across India.
Water meters
For long, water meters have been a low priority area. Paying for a natural resource like water was not acceptable to many in a welfare state like India. Meter technology evolved after it was realised that water is a limited resource and its misuse must be checked.
“People often get wrong bills. So, it is in their interest that they get a more precise reading,” said Neville Bhasin, programme coordinator of Krohne Marshall, market leader in flow meters. Earlier, most Indian homes had Positive Displacement Meters. The volume of water used was measured by displacement of components in the meter.
In 2005, Delhi Jal Board approved the Inferential Meter. Its mechanism does not involve any contact with water. The water drives a turbine and the reading is proportionate to the volume passed through it. It is preferred primarily because it cannot be tampered with. This rust-free meter is air-tight which does not allow moisture that could make the dial hazy and, therefore, unreadable.
But mechanical meters are prone to inaccuracies that creep in when silt and suspended particles start clogging it. Their moving parts also obstruct the flow resulting in a pressure drop of about 3.5 kg per square cm, said Bhasin. To account for the loss in pressure, a utility manager would have to spend Rs 13.5 lakh in pumping for a bulk meter with flow rate of 2 million litres per hour.
According to the Central Public Health Environmental Engineering Organisation, mechanical meters show an error of two to four per cent.
Opposed to this, electromagnetic meters can be erroneous by just 0.5 per cent. These meters obtain the flow velocity by measuring changes of voltage with water passing through a magnetic field. Here, kinetic energy is converted to electromagnetic signals.
But the electromagnetic meter’s precision does not come cheap. For instance, water meter for a 15 mm pipe would cost Rs 50,000. In Delhi, the nine approved mechanical meter manufacturers price their meters between Rs 750 and Rs 1,350. It is for this reason that electromagnetic meters are not advocated for use in households. In bulk usage, it pays huge dividends.
In Indore, 20 per cent people consume 80 per cent of the water supplied. To optimise revenue generation, accuracy was prioritised. Krohne Marshall was assigned the task of installing electromagnetic meters. The company invested a whopping Rs 110 lakh. Consumers did not get inflated bills and all of them paid up. Revenue increased by Rs 84 lakh annually. Measurement of the Western Railways’ water consumption paid dividends with the bills increasing by Rs 15 lakh each year since February 2008.
Metering is beneficial to the consumer. A tariff structure based on volume consumed can promote equity and target subsidy, said Sriniwas Chary, service delivery strategist affiliated with the Administrative Staff College of India.
Smart future
The way ahead lies in smart metering with communication. These digital displayed meters relay information to a central server through the internet or a wireless network. Radio frequency networks pick up meter readings on a laptop within a driving radius.
Seventy per cent of the investment on smart meters can be recovered through savings on operational cost, including doing away with meter readers, according to the California Public Utilities Commission.
Smart meters can record consumption in short intervals, each hour or even less. This helps resource managers and consumers manage their demand. They also have sensors that can report opening of the meter cover, magnetic anomalies, extra clock setting and inverted installation. But smart meters are not without controversy, with consumers in California alleging they were logging more units. An independent study in September 2010, however, found that they gave correct readings.
Meters are usually installed in corners of houses making reading difficult. Master Meter Inc, a North American manufacturer, has taken reading to a superior level. It has military-inspired drones that can help utility managers take readings from the sky. Weighing less than a kilogramme, the carbon fibre drone is fitted with a receiver that can collect water, gas and electric meter readings all at one go while passing overhead. It is self-guided with the aid of a Global Positioning System. It is battery operated and can fly for 90 minutes per charge. These meters are being used in the US and Israel.
All meters can be tampered with, and all can be fixed. Unless technology evolves, regulation would remain weak.