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The important role of Li ion battery in power grid energy storage

Author: Source: Datetime: 2016-11-23 11:23:34

Large lithium ion group in 10 years ago is still relatively unpopular. But now, the application of lithium ion battery can be too numerous to enumerate. There was no battery pack on the ship before, but now we can see the 1~5MWh battery pack. The battery pack, which is used by unmanned underwater vehicles, mine trucks and buses, has reached 350kWh, while the real super batteries are those that are used on the ground. The expansion of the market share of the lithium ion battery in the developing countries has a multiplier effect.

 

Power grid function

 

With a relatively large ground lithium ion battery is a new (e.g. for peak shaving) market as an example, factor weight is not a priority, there is a certain relationship between the volume, but the battery life, life cost ratio, performance and reliability is the most important.

 

For example, Toshiba (Toshiba) in the market on the anode of titanium dioxide has a good cycle life. The application includes balancing the power supply of the power grid and providing emergency power supply in case of power failure. 

 

The UK is to test its first battery system for adjusting the power grid frequency. , the UK's national grid (Grid National) and the UK's renewable energy systems (Energy Systems Renewable, RES) announced in June 2016 that it would work together to develop the system.

 

This 20 MW battery solar power generator system can be powered by 1000 pure electric vehicles. Prior to the RES company in the United States has installed 6 groups of similar battery storage systems.


lithium battery pack


It will provide the dynamic frequency response service, whether it is higher or lower than 50Hz, and the frequency offset can be detected within 1 second. This work is a test platform for the 200MW enhanced frequency response (Frequency Response Enhanced) service plan developed by the UK National Grid in the UK in the future.

 

Competing technology

 

In the selection of solar backup generator systems, RES is a technology that holds the. But the company said that all of its currently running 74MW projects are used in lithium ion batteries, so the current contract with the possibility of using lithium-ion battery is very high.

The UK is moving towards a hybrid generation, increasing the proportion of low-cost renewable energy, the service and the future of the enhanced frequency response service plan will provide support for the grid in this case.

 

The competition of large scale lithium ion battery in power grid application comes from the vanadium redox flow battery (flow batteries vanadium). In addition, the India central Electrochemical Research Institute (CECRI) will be published in 2019, a zinc bromide redox flow battery (bromide redox flow battery zinc), used for renewable energy grid level storage.

 

To the small office, using this technology, can use the signal station for fast charging station for the bus, the bus from the power supply or lithium ion battery with super capacitor protection, or just super container can fast frequent charging. In either case, the ground equipment tends to use a lithium ion battery that is interspersed with a super capacitor.

 

The dominant position of Li ion battery has not yet been shaken

 

Even in the face of many challenges, the integration of large scale lithium ion battery and power grid, and even its application in micro grid is essential.

 

Some people even consider, to a problem in the grid price and reliability, and because of pollution, noise and reliability problems to the diesel generator used in the city of the local establishment of micro grid.

 

Diesel generator sets in the world have at least 600GW of electricity generation, but some of the ecological agenda has called for all of its elimination. Alternative equipment included in the buildings, roads and parking lot on the road to install solar battery, and with the wind generator, and can use the wind kite (autonomous kite) and independent power generation tied four axis aircraft (quadcopter). The lithium ion batteries also can be used in our portable solar power generator.

 

The power generation technologies are intermittent, and they all require energy storage. Although it can be collected from multiple sources of energy, so that each part of the intermittent period of different power balance, reduce the required storage energy, but energy storage is a must, because they are not always in need of electricity when it is power.

 

Batteries can be stored for long periods of time, and the super capacitor is not going to work in this area. Lower tolerance for lead pollution can help the expansion of lithium ion batteries, eliminating more and more of the less popular lead-acid batteries. India, for example, is looking for a way to replace lead-acid batteries in railways and other places.

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