Comparison of investment cost and benefit of energy storage power station

At present, lead-carbon battery, lithium battery power and capacitor battery are used to compare the cost and benefit of energy storage power stations according to 500kw-8h (4000KWH) energy storage power station.

According to 500kw-8h (4000kWh) energy storage power station, three different batteries are used to compare the cost and benefit of energy storage power station respectively. See table 1 or table 2.

Table 1：Parameters of three different battery energy storage power stations

For the parameters of table 1 shows the following:

Lead carbon battery discharge depth is 60% DOD, so 4000 KWH energy storage power station battery capacity needs according to 4000 KWH / 0.6 = 4000 KWH configuration;

Lithium battery discharge depth is 90% DOD, battery capacity, according to 4000 KWH / 0.9 = 4445 KWH configuration;

Power capacitor battery discharge depth is 90% DOD, but battery capacity about 11.6% margin, so the battery capacity according to the configuration of 4000 KWH.

Need to replace the battery, is 1 to charge and discharge per day according to the energy storage system, battery cycle times, 10000 times the cumulative (27 years running; Lithium battery and lead the carbon cycle times, 3000 times, need to replace the battery 3 times.

Table 2: Comparison of investment costs and benefits of energy storage power stations

The following parameters are used to calculate the investment cost and benefit of energy storage power station in table 2:

Commercial peak valley price difference, calculated according to 1.01 Yuan/KWh in Beijing;

Energy storage system annual electricity price differential income calculated according to 365 days;

Year of accumulated earnings according to the battery energy storage system with cycle times, 10000 times calculation, for 27 years.

Look from the table 2, used in the whole life cycle for 27 years, like a conclusion:

Lowest power capacitors battery energy storage cost per kilowatt-hour, followed by lead carbon batteries and lithium batteries;

Power capacitor lead battery energy storage system accumulative total revenue is higher than carbon battery energy storage system;

Lowest power capacitors battery system accumulated investment of equipment, followed by lead carbon battery and lithium battery.

The highest power capacitors battery system equipment initial investment, second is lithium battery and lead carbon batteries

4000 KWH battery energy storage power station built by different there are several differences:

1. As a result of the power capacitor battery charge and discharge efficiency is high, so the power capacitor cells under the same power configuration capacity is the smallest, have played an important role in saving resources.

2. Lead-carbon batteries cost the least per kilowatt-hour, followed by lithium. Power capacitor batteries cost the most per kilowatt. Power capacitor batteries are more than five times higher than lead-carbon batteries.

3. Power capacitor cell cycles is lead three times more carbon battery and lithium battery. So in the use of the energy storage power station 27 years time power capacitor cells do not need to change, and lead the carbon battery and lithium battery need to change the battery of the above at least 3 times.

4. Power capacitor of whole life cycle cost per KWH energy storage battery carbon batteries, lithium battery is much lower than lead.

Based on the above advantages, power capacitors battery will be used widely in the field of energy storage.

Now commonly used chemical energy storage power station mainly lithium battery energy storage power station and lead carbon battery energy storage power station is given priority to. In recent years because of the country's emphasis on and chemical energy storage power station has made some progress, but also exposed a series of problems, the main obstacles to promote the cause of the chemical energy storage power station is not conform to the requirements of the people of the battery. So under social keenly awaited power capacitors battery arises at the historic moment.

Xi'an Deyuan Nano energy storage Technology Co., Ltd. is a power energy storage power station, energy storage power, backup power supply, pure electric vehicles and hybrid electric vehicle power capacitors battery integration equipment, uninterruptible power supply, emergency power, charging equipment, power capacitors battery integration equipment, battery management system of research and development, production, sales for the integration of high-tech enterprises. Its power capacity battery is: good safety, long service life, due to wide, optimization design, charging fast, environmental protection and efficient, battery recycling and so on seven big advantage.

Good safety advantage: power capacitor cells by extrusion, acupuncture, short circuit, heating, vibration, safety tests, battery not burning, not explode.

Long life: Energy storage battery using dynamic capacity battery, the charging and discharging life reached more than 10000 times.

Wide temperature advantage: wide energy storage power capacity battery, can be in charge and discharge to 40 ℃ environment. This makes the battery can be used in most of the country, including Tibet, Xinjiang, Qinghai, Heilongjiang and other alpine regions. Power capacity battery, can charge and discharge at + 55 ℃ condition.

Optimized design advantages: Power capacitor batteries, tailored for automotive, energy storage and power equipment. 1 The capacity of single battery can be 300Ah, 1000Ah, 1500Ah, 2000Ah, 3000Ah, 2000Ah, 10000Ah, etc., which can significantly reduce the number of batteries in automobiles, energy storage and power supply equipment, reduce the difficulty of battery monitoring and management, and improve the overall reliability. 2 The batteries of automobile, energy storage and power supply equipment are connected in series; the disadvantages of mutual charge and discharge caused by the difference of battery cell voltage are avoided, and the service life of the battery is improved.

Fast charging advantage: Power capacitor battery, its charging rate can reach 10C. When used in applications such as automobiles or energy storage, the charging current often reaches 400-500A.

Environmental protection high efficiency advantage: power capacitors battery there is no acid mist and other volatile harmful substances, and so on the land, rivers, won't cause pollution.

Battery recycling advantage: power capacity battery is rich in rare earth elements, nickel compounds, such as scarce resources, a ton of batteries containing rare earth 300-350 kg, nickel 350-400 kg, recovery rate is higher than 90%.Recovery value of less than 50% of the sales price, implements the rare earth in the process of battery, nickel and other rare resources recycling and dynamic reserves.

Table 3: performance comparison between power capacitor battery and general battery

Can be seen from the table above power capacitor cells in a variety of battery performance is superior to today's mainstream.

Xi'an Deyuan Nano Energy storage technology co., LTD., officially launched the 500kw energy storage power station system is a typical design scheme.

Figure 1: Energy storage power station system diagram

The energy storage power station is mainly composed of a plurality of systems such as an energy storage battery pack, an energy management system, and a grid-connected subsystem. Among them, the battery has been replaced by a power capacitor battery. This makes the system have advantages in other systems:

1. The plant long service life

Due to the power battery the cycles of a lot of long service life than ordinary battery, so have good performance in energy storage power station, not because the cause of the battery life and affect the operation of the energy storage power station.

2. Maintenance cost is low

Because of the power capacitor battery cycles is more, so the energy storage power station will not influence for the attenuation of the battery energy storage power station's benefits. While the traditional battery energy storage power station due to its limited by battery performance will be replaced periodically the needs of the battery (note: the power plant is the main investment cost battery.).In and replace the battery need other fees, and the benefit of the loss during the replacement battery production will make the investment income is lower.

3. High safety

The power capacitor battery is determined by its own material to not cause combustion and explosion. Therefore, the energy storage power station of the energy storage power station has greatly improved safety compared with other types of batteries, and no major destructive accident will occur.  

4. The high value of recycling, no pollution

Power capacitor cells contain a variety of rare earth materials, so the power capacitors battery has the very high collection value, second power capacitor cells contain no pollution to the environment can be zero pollution. For lithium battery energy storage power station is not only need to replace batteries for many times, and lithium batteries to recycle and is a serious pollution source, so for the lithium battery energy storage power plant waste processing is also facing a big problem.

5. Electrical energy conversion rate is high

Conditions relative to the lithium battery discharge capacitance batteries which power the same high efficiency about 10%, compared with the lead carbon battery discharge efficiency is more than 40% higher. So the power capacitors battery has high energy conversion efficiency, reduces the power loss, have played an important role in energy conservation and emissions reduction.

6. Good temperature performance

Battery discharge is the process of converting chemical energy into electrical energy, and temperature has a great influence on chemical reactions. Due to its special design, the power capacitor battery has improved the temperature performance to ensure the discharge characteristics of the battery under extremely harsh conditions. This makes the storage site of the energy storage power station greatly expanded in China, and the lithium battery will have a very low capacity at low temperatures, which is not suitable for operation under low temperature conditions.

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