Home > Knowledge > Content
Several major technical directions for the development of energy storage industry
- Jun 04, 2018 -

Core Tip: At present, China and China have the highest cumulative pump energy storage capacity, accounting for more than 90% of the total, and the second is molten salt heat storage, and the third is electrochemical energy storage. From the perspective of development speed, the electrochemical growth is rapid. As of the end of 2016, the global scale of electrochemical energy storage capacity reached 1756.5MW, a compound growth rate of 27.5% in the past five years, of which lithium-ion batteries have the largest cumulative scale, exceeding 50%. Electrochemical energy storage has the advantages of good equipment maneuverability, fast response speed, high energy density, and high cycle efficiency. It is a hot spot in the current development and research of energy storage industry. It is mainly used in grid auxiliary services.

At present, China and China have the highest cumulative energy storage capacity, accounting for more than 90% of the total, heat storage for molten salt is second, and electrochemical energy storage ranks third; from the perspective of development speed, electrochemical growth is rapid, as of 2016. At the end of the year, the global scale of electrochemical energy storage capacity reached 1756.5MW, a compound growth rate of 27.5% over the past five years, of which lithium-ion batteries have the largest cumulative scale, exceeding 50%.


Electrochemical energy storage has the advantages of good equipment maneuverability, fast response speed, high energy density, and high cycle efficiency. It is a hot spot in the current development and research of energy storage industry. It is mainly used in grid auxiliary services, renewable energy grid connection, and power transmission and distribution. Distributed generation and microgrid fields. From the perspective of the electrochemical energy storage projects that have been put into operation in China, the largest installed capacity is in the distributed generation and micro-grid areas, followed by renewable energy grid integration, power assisted service, and power transmission and distribution.


Classified from the technical direction, mainstream electrochemical energy storage technologies include advanced lead-acid batteries, lithium-ion batteries, flow batteries, and sodium-sulfur batteries.


With the advantages of safety, reliability, large capacity, and high cost performance, traditional lead-acid batteries still have a solid position in the field of energy storage. In recent years, the emergence of new lead-acid technologies represented by lead-carbon batteries has greatly offset the shortcomings of traditional lead-acid batteries, such as low specific energy and short life span, making it possible for applications in large-scale energy storage.


Lithium-ion batteries are composed of positive and negative electrodes, separators and electrolytes. They have many advantages such as high energy density, wide operating temperature range, no memory effect, rapid charge and discharge, and environmental friendliness. Currently, they have been widely used in various electronic products in China. , new energy vehicles and electrochemical energy storage and other fields. Particularly driven by the growth in demand for power batteries for downstream new energy vehicles, the industrial scale and technological development have accelerated, and the technology and industry chain are further maturing.


The flow battery has the characteristics of good charge and discharge performance and long cycle life, and is suitable for large-scale energy storage applications. At present, the more mature liquid flow battery systems are two-fluid systems including all vanadium, zinc bromide, ferrochromium, and sodium polysulfide-bromine. At present, the most widely used and researched are all vanadium redox batteries, but due to the high cost and bulk density For low-level reasons, the industry is still in its infancy. The technologies of batteries such as zinc bromide, ferrochromium, and sodium polysulfide are either monopolized or are in the research and development stage and have failed to achieve industrialization.


Sodium-sulfur batteries use elemental sulfur and metal sodium as positive and negative electrodes, and β-alumina ceramics as electrolytes and separators. Their operating temperatures are between 300-350 degrees Celsius. They have high energy density, good power characteristics, long cycle life, and relatively low cost. Low-level advantages, its size accounts for about 30-40% of the global installed capacity of electrochemical energy storage, second only to lithium-ion batteries. However, due to technical monopoly, it is currently unable to promote large-scale domestically.


From the point of view of technology maturity, economy, safety, and environmental protection, lithium batteries are an electrochemical energy storage technology that has developed rapidly in China and is expected to lead the commercialization of energy storage.