Why the battery is important
Good batteries need to meet a few requirements, but there are two points that are essential: reliability and cheap.
"The biggest problem with batteries is cost," said Eric Rohlfing, deputy director of the Advanced Energy Research Program (ARPA-E), which is responsible for identifying and funding front-end R & D projects at the US Department of Energy. ) In a 2012 survey, the average American is willing to spend about $ 13 a month in order to ensure that the entire US electricity supply is based on renewable energy. Therefore, the battery can not significantly increase people's electricity costs.
For the utility sector, that means that the cost of the transmission grid-level energy storage system can not exceed $ 100 per kilowatt-hour. Since the inception of the US President in 2009, ARPA-E has invested a total of $ 85 million to develop a new battery that achieves that goal.
"People say I'm crazy." According to "Electricity" published an electric vehicle battery research, for a since the birth has not been close to 700 US dollars per kilowatt-hour cost of the industry, the target figure is simply low absurd. Luo Erfen said that now, although still can not be achieved, but 100 US dollars per kilowatt-hour is the industry's standard target. If you can do this figure below, then you are not only very competitive - you can win everything.
That is to say, the battery that can win the market is like this: cleaner, more reliable energy systems that do not depend on fossil fuels and start stronger.
Every time you fluctuate the lighting switch, you have access to a huge stealth network: the transmission network. Somewhere, at the other end of a high-voltage transmission line that delivers electricity to your home, a power plant (which may be burning coal, or using increasingly popular natural gas) generates electricity to replace you and others who have just used up electricity The
Our grid power at any time need to be carefully maintained - whether it is too much power or too little power, will cause problems. The grid operator needs careful observation and prediction in order to determine how much power should be generated per hour or even per minute of the plant. But sometimes they will go wrong, which requires the power plant to make timely adjustments to make up the power balance.
Fortunately for us, the grid is a huge interconnection system, so we rarely notice the change in power or quantity. Think about the difference between stepping into the bucket and stepping into the ocean. In a small system, the balance between supply and demand changes are obvious - the bucket of water will overflow. But because the grid is so huge - like the ocean - the changes are usually not aware of. Only when the problem is relatively large we will pay attention to get, because the surrounding lights are extinguished.
Renewable energy is less manageable than coal-fired or gas-fired power plants - if people suddenly demand soared, you can not build electricity to solar power stations. Solar energy peaked during the day, during which the changes will change because of the clouds, the night will disappear. Wind is even more unpredictable. If the grid has too many such intermittent phenomena, the balance of power supply and demand will increase the difficulty, power outages will become more frequent.
Energy storage is a safe solution. If you can store excess energy somewhere and then extract it from where you supply it again, you can use renewable energy to give much more energy, even if the weather is not clear and the wind is not blowing The In addition, the grid itself will become more stable and effective, because the battery allows the various communities and regions to manage their own power supply. We are getting older and weighed too much power infrastructure will go farther. You can get power during off-peak hours, store it in batteries, and use it when you need it. In this way, you do not have to lay out new transmission lines in areas where the existing transmission lines are close to the maximum transmission capacity.
In this way, the bucket can become more like the ocean. That means - at least theoretically - the generation of electricity and electricity is more dispersed, the use of renewable energy is increasing, and the reliance on large-scale power plants burning fossil fuels is reduced.
This is the battery of such things so important reason.