Prospects for the development trend of energy storage technology

It is estimated that by 2030, the maximum daily power fluctuation of China’s wind power and solar energy is expected to be 400-600 million kilowatts, which completely exceeds the self-regulating ability of the power supply.

Therefore, there is an urgent need for energy storage technology to develop in the direction of higher energy efficiency and wider application.

What is the development trend of energy storage technology?

It is well known that the higher the energy density, the stronger the instability. As a power storage system, in order to become a resource for power system regulation, it must perform application functions such as peak regulation, frequency regulation, inertia support, and voltage regulation.

Therefore, ensuring the performance of long life, high safety, large capacity, low cost, and multiple application scenarios will become the main trend of energy storage technology for the future development.

Long lifespan

The more common problem is that it is difficult to control the temperature of the high-density battery collection within a safe range, and at the same time, it is impossible to balance the battery capacity retention rate under different discharge depths.

As a result, the available capacity of the battery of the whole machine is seriously reduced, a large number of battery cells are bulged, and the safety risk is greatly increased.

In the latest liquid-cooled energy storage products – PowerTitan and PowerStack released by Sungrow, the major technical pain point of short lifespan has been effectively alleviated.

After repeated verifications, experts believe that if the operating temperature of the energy storage system can be maintained between 18°C and 26°C during the entire life cycle, it will have the least impact on the life of the battery.

While slowing down the aging of the battery, it can also maintain the equipment in the best operating state. The liquid cooling technology of Sungrow has also become a new technical direction of energy storage thermal management.

The balance of cell temperature determines cell life and efficiency. This new product of Sungrow’s energy storage adopts the liquid cooling temperature control method.

Through the design of multi-stage variable-diameter flow channels and micro-channel current sharing, the temperature difference between the cells is less than 2.5℃, and the battery life is extended by more than 2 years.

During the life cycle of a 100MWh power station, an additional 53 million kilowatt-hours of electricity can be released.

Extreme security

Strengthen the safety risk prevention of new energy storage, and ensure the safety of the whole process of construction and operation of new energy storage projects.

Extensive battery status detection, lack of early warning of thermal runaway of cells, insufficient linkage protection, and insufficient fire protection design are the main reasons for a series of energy storage safety problems.

In response to this problem, Sungrow first proposed a new idea of “active safety” for energy storage.

On the basis of traditional “passive protection”, power electronic technology is applied to active safety protection design, and the safety of the entire life cycle of the energy storage system is guaranteed from the cell level, battery cluster level, and system level.

Large capacity

The Chinese government issued a document requesting to speed up the research and development and promotion of large capacity energy storage technology, and to improve the ability of grid collection and transmission.

In the future, it will still focus on three aspects: large capacity, high parameters and low pollution, and accelerate the promotion of China’s energy and resource utilization efficiency to reach the international advanced level by 2030.

Sungrow in energy storage liquid cooling companies in China, its new liquid-cooled energy storage products shine in large-capacity system design ideas.

Through the front single door design, it supports back-to-back and side-by-side display layout, which can reduce the floor space by more than 25%.

And the DC side supplementary design is adopted to further reduce the difficulty of capacity expansion and supplementation in the future.

In the system integration design, it is greatly compatible with the multi-cell platform design, and with the increase of the capacity of the energy storage power station, the energy consumption of the auxiliary power will also be continuously compressed, forming a virtuous circle.

System integration and collaboration efficient

The energy storage system itself is the integration of various software and hardware. If the enterprise itself does not have the ability to integrate production, even if these synapses from different manufacturers achieve the highest operating efficiency, it will not be able to achieve synergy and high efficiency.

In the full range of liquid-cooled energy storage systems, Sungrow has given full play to the advantages of cell-level, battery-cluster and system-level through a number of technological innovations such as new temperature control and battery management, so that the operation data of each link can be communicated.

To achieve the purpose of improving life, increasing efficiency and reducing loss, and realizing the evolution from single high efficiency to synergistic high efficiency.

Actively supporting the grid

At the application level of liquid-cooled energy storage, the platform design idea is based on the “three-electrical integration” of power electronics, electrochemistry, and grid support technologies.

Sungrow’s new products help power grids and loads to form a flexible coordinated operation of source-grid-load-storage to achieve an efficient application level that actively supports grids.

Liquid-cooled energy storage products have comprehensive application channels on the power generation side, power transmission and distribution side, and user side.

It can not only realize the application scenarios of new energy frequency regulation, peak shaving and valley filling, balance the supply balance of transmission and distribution lines, and promote the stability of the power grid, but also provide off-grid power supply functions for application scenarios such as black start.

And it also has a stable performance in the application scenario of the micro grid, which is enough to cooperate with new energy power generation to provide clean energy to remote areas without electricity.

As the penetration rate of new energy increases, the power grid presents uncertainty and complexity.

The new generation of energy storage system needs to move from passively adapting to the power grid to actively supporting the power grid, further realizing the “OneGrid” deep integration of energy storage and power grids.

Conclusion

Energy storage technology will develop towards higher energy efficiency and wider application in the future. In order to continue to develop the market in the energy storage direction, it is necessary to create value for customers as the purpose of product research and development, and continuously optimize and upgrade the energy storage system.