With the continuous jump of renewable energy, its volatility and intermittent also bring a certain impact on the grid, in this case, the role of energy storage is highlighted, but also in the industry more and more attention. For better understanding of energy storage, development of energy storage battery technology, suggest:

 

First of all, to clarify the basic concept, energy storage battery technology including energy storage battery technology and energy storage battery applications, both are very important.

 

In a broad sense, energy storage is the use of a device or a method to store power, and the realization of energy in the space dimension after the release or after the time dimension of the release. On this basis, can be further subdivided into two categories: mobile energy storage, that is, mobile equipment, electric vehicles, such as power batteries, static energy storage, such as UPS power supply, communication base station power supply, industrial thermal storage system and pumped storage power station. In addition, the use of natural photosynthesis of plants or the artificial photosynthesis of new photochemical conversion materials, the conversion of light energy into biomass energy or chemical energy and storage and release, is also a kind of important static energy storage mode.

 

According to the energy form used, the technology can be divided into four categories; physical energy storage (pumped storage, compressed air energy storage, flywheel energy storage, superconducting energy storage), electrochemical energy storage (all kinds of two batteries, electrochemical supercapacitors), chemical storage (artificial clean energy such as at, carbon storage, such as chemical reaction storage energy), thermal/ Cold storage (thermal energy storage, phase change energy storage, chemical reaction storage heat). The energy storage battery belongs to the electrochemical energy storage, and is the most rapidly developing type of energy storage technology.

 

However, not all batteries can be called energy storage batteries, the system power in the 1KW level above, for electric vehicles, communication base Station battery, can be called energy storage battery; The system power ≥1MW, the battery used in the energy storage power station is called the Power storage battery.

 

The application technology of energy storage battery mainly refers to BMS (battery management System), PCS (energy control device of battery storage System), EMS (Energy Management System). The BMS is the link between the battery body and the application end, the main object is two times the battery, the goal is enhances the battery utilization, prevents the battery to appear excessively to charge and the excessive discharge. PCs are systems that are compatible with the energy storage pack, are connected between the battery pack and the grid, and the power grid is stored in the battery pack or fed back to the grid. EMS is the general term of modern power dispatching automation system, including computer, operating system, EMS support system, data acquisition and monitoring, automatic generation control and planning, network application analysis.

 

Secondly, demand-oriented, according to the actual needs of different applications to develop a suitable energy storage battery technology; Low cost, long life, high safety and easy recovery are the overall goals of the development of energy storage battery technology.

 

Storage can play an important role in many aspects, such as the power grid peak frequency modulation, smooth renewable energy generation fluctuations, improve distribution quality and reliability, base station, community or home standby power supply, distribution of micro-grid energy storage, electric vehicle veg™ mode of energy supply system. There are different scenarios and technical requirements for storage applications, and no type of battery can meet all the requirements of the scene. Therefore, to be demand-oriented, according to the actual needs of different applications to develop a suitable energy storage battery technology.

 

At present, the high cost of energy storage technology and poor economic performance are common problems. The cost reduction of energy storage technology can be divided into four target stages. Current goal: Development of energy storage battery technology and market for non-peak function, such as electric vehicle power battery market, off-grid market and Power FM market; short-term (5-10-year) target: lower than the peak-valley electricity price difference in electricity costs; medium (10-20 year) target: lower than the thermal power peak (and dispatch) cost; Long term (20- 30) Target: less than the same period of power generation electricity costs.

 

Although the current business model of using the peak-Valley electricity price difference to develop the energy storage is quite concerned, this may be a pseudo proposition, which is feasible in the short term and does not seem feasible in the long run. The reason is that, as the cost of energy storage technology decline, the grid’s peak and valley electricity spreads will be lower. In the future only when the energy storage cost is lower than the thermal power peak shaving cost, the energy storage equipment may be added to the grid dispatching system as an important supplement.

 

There is a potential crisis in existing types of energy storage batteries. The safety problems caused by the aging and breakage of the sodium-sulfur battery and the ceramic tube. Lead-acid (lead-carbon) batteries, lead concentrates about 15 years mining completed, low cost and high pollution recovery links. Full vanadium liquid-flow battery, the system efficiency is less than 70% of the “ceiling”; toxic vanadium sulfate solution; the diaphragm has no balance with the battery magnification and electrolyte cycle life; Lithium-ion Battery: The existing battery structure is difficult to recover, the cost is high, the battery has the security hidden trouble, the application cost is high.

 

On the whole, low cost, long life, high safety and easy recovery are the overall goals of the development of energy storage battery technology.

 

Thirdly, we should pay great attention to the basic innovation research and intellectual property distribution of large-scale power storage battery technology, and promote the intellectual property commercial sharing of energy storage battery technology.

 

With the application of energy storage scale, large-scale energy storage technology is the development trend of the future, and the development of ultra-high power energy storage battery technology with single power ≥100kw will be an important research and development direction. In order to solve the problem of application, we should make small batteries with the idea of little battery, enlarge the battery with the idea of big battery, and not use the structure thought of the battery to produce the large power storage battery.

 

In addition, our current understanding of the application of energy storage technology and the nature of energy storage technology may be preliminary, superficial. Power storage is a system of storage/discharge concept, it is likely to require a variety of technical economic models of the combination, rather than confined to the single battery cycle charge and discharge behavior understanding.

 

China’s intellectual property is more than 60% foreign dependence, in the core technology, China’s foreign intellectual property is even more than 90% degree of dependence. In the process of strengthening the research of basic scientific exploration and the development of original innovation technology, the energy storage technology should strengthen the evaluation of intellectual property competitiveness and the prospect of technology application in the project of energy storage.

 

How can we break through the layout and blockade of the relevant intellectual property when we are already mature or have already entered the demonstration application of the energy storage technology abroad? In this respect, it is suggested to set up the intellectual property evaluation and trading platform of energy storage industry, to guide the orderly development of the energy storage technology industry chain, to establish a sound intellectual property protection and commercial sharing mechanism, to strengthen the patent layout of the core technology points, to actively guide capital industry and venture investment into frontier technology development

 

Finally, according to the energy Storage (battery) technology to develop the energy storage industry realistically, it must be in the premise of safe and reliable storage battery technology, and then carry out large-scale megawatt-level demonstration applications.

 

In the power industry, safety is the primary consideration, and the application of energy storage is no exception. The safety, reliability and economy of energy storage battery technology are the prerequisite to determine its scale utilization.

 

It is necessary to make clear the difference and connection between the technology of storage battery and the application of energy storage battery. For the majority of energy storage battery technology, when the technology to carry out megawatt-level demonstration applications, the main is to find and solve the energy storage system in the application process of technical problems and economic evaluation, rather than the storage battery technology problems. In other words, we should carry out the demonstration application of megawatt level above the premise of the safe and reliable technology of the energy storage body. The purpose of the demonstration application is to accumulate application data, develop applied technology, solve application problems and evaluate the application economy. If the demonstration project progresses smoothly, its massive promotion also will unfold gradually, the energy storage industry can develop healthily.