Dyness Knowledge | The integration of storage and charging
Riding the wind of the times, the charging industry continues to soar
New energy vehicles have become the first choice for green travel under the dual carbon targets, and the rapid development of new energy vehicles has led to the demand for charging and replacing batteries. The charging pile industry was driven by a large number of policies and subsidies in the early stage to speed up the construction process. In recent years, the ratio of vehicles to piles has been maintained at around 3:1. As of June 2023, the number of new energy vehicles in my country will reach 16 million, and the number of charging piles will reach 6.09 million. The vehicle-to-pile ratio has dropped to 2.6:1, and there is still room for development to achieve a lower vehicle-to-pile ratio.
Integration of storage and charging: a new direction leading the double revolution of energy and transportation
Charging piles are divided into DC charging piles and AC charging piles. The charging current of the AC charging pile is small, the charging time is long (usually 6-10h), and it is slow charging, which is suitable for parking spaces in residential areas and office buildings. The charging current of the DC charging pile is large, and the charging time is short, and the charging time is 20-60 minutes. DC fast charging is also popular due to its fast charging characteristics, and the demand is increasing. High-voltage fast charging is an important development direction of charging piles.
However, with the explosive growth of new energy vehicles and the popularity of super fast charging, high-power charging will have a huge impact on the existing charging network system. High-power DC fast charging puts forward higher requirements on the power grid, and this is the stage of the energy storage system, and the concept of integrated storage and charging came into being. Breaking down charging barriers, providing innovative solutions for charging pile infrastructure, and bringing new business opportunities to the energy industry.
The energy storage system is like a power warehouse, intelligently storing electric energy during low peak hours and releasing electric energy during peak hours. This not only relieves the pressure on the grid, but also makes the charging process more efficient and stable. The close combination of charging station and energy storage system makes the integration of storage and charging a new direction to solve charging problems. A charging station equipped with an energy storage system can not only balance power output, but also provide additional power support, making DC fast charging more stable and reliable.
Integration of storage and charging: the rise of innovative energy business opportunities
The traditional profit model of charging piles relies on charging service fees, and the profit model is relatively simple. Moreover, charging piles still have operational pain points such as heavy assets, long payback period, low utilization rate of single piles, and extensive competition. The charging pile with integrated storage and charging can use the battery energy storage system to absorb low-peak electricity, and support fast-charging loads during peak periods, supply green electric energy for electric vehicles, and realize auxiliary service functions such as peak-shaving and valley-filling.
Peak valley arbitrage
Peak-valley arbitrage is the main profit model for integrated storage and charging. Storing electric energy during the valley period of electricity prices and discharging it during peak periods of electricity consumption avoids direct large-scale use of high-priced grid electricity, which can reduce business operating costs and achieve peak-valley electricity price arbitrage. Under the current time-of-use electricity price mechanism, many provinces and cities can satisfy industrial and commercial energy storage with two charges and two discharges per day. When there are two peak periods, the industrial and commercial energy storage system can be used to charge during valley hours/normal times. And discharge in two peak periods respectively to achieve two charging and two discharging every day, thereby improving the utilization rate of the energy storage system and shortening the cost recovery cycle. Shandong's latest "Notice on Further Improving the Time-of-Use Electricity Price Policy for Residential Electric Vehicle Charging Pile" divides the peak and valley of electric vehicle charging into five periods: deep valley, low valley, normal, peak and peak. It can realize two charging and two discharging in one storage and charging.
However, the division of peak and valley periods between charging stations and industrial and commercial power consumption does not always follow the same principle. For example, the time division of time-of-use electricity consumption for industry and commerce in Hainan Province: peak hours 10: 00-12: 00, 16: 00-22: 00: normal hours: 00-10: 00, 12: 00-16: 00, 22: 00-23: 00: valley period 23: 00-next day: 00, simple energy storage can realize two charging and two discharging. The division of time-of-use electricity prices for electric vehicles: peak hours 16:00-24:00: normal hours 8:00-16:00: valley hours 0:00-next day 8:00, the integration of storage and charging can only achieve one charge Once released, the profit model will be greatly reduced.
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Demand response
The integration of storage and charging can also accept the invitation of "demand-side response", use energy storage for peak-shifting electricity consumption, respond to peak-shaving, participate in the auxiliary service market, and obtain subsidies.
Demand management and dynamic capacity increase
Dynamic capacity expansion means that when the actual power used exceeds the capacity of the transformer, the battery will release the stored reserve power to reduce the peak power, thereby reducing the cost of transformer capacity expansion. This scenario is more common when a large number of electric vehicle charging piles are connected. It is rare that charging piles are fully used. According to the full configuration of charging piles, the cost of transformer capacity increase will be increased. The integrated storage and charging can solve the problem of insufficient power distribution capacity of charging stations and respond to the peak power consumption of charging piles in a timely manner.
Opportunities and challenges of storage and charging integration
The era of storage and charging integration has quietly arrived. And with the continuous innovation of technology and the expansion of industrial scale, the cost of energy storage system continues to decrease. The stability and reliability of the system have been continuously improved, and the distribution storage is the upgrade direction of future charging upgrades and battery swaps. The rise of storage and charging integration is not only a technological innovation in the energy field, but also a key step to achieve ecological win-win and lead a sustainable future.
However, both charging and energy storage are industries affected by policies, and the rate of return largely depends on the time-of-use electricity price policy and subsidy policy. And there are uncertainties in the profit model, such as the uncertainty of peak and valley electricity prices. With the uncertain demand for charging and discharging, how to turn the profit model into a viable business model is an urgent problem to be solved.
Dyness continues to explore more new business models for integrated storage and charging. Its industrial and commercial product DH200F outdoor energy storage integrated cabinet has the characteristics of flexible configuration and convenient capacity expansion. It can be widely used in industrial and commercial distributed charging piles and centralized charging stations. In terms of product innovation, DC coupling technology is forward-looking. Significantly improve the energy conversion efficiency of solar storage and charging, and further improve the economics of the project.
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