Trends in energy storage containers

Development Background


With the increasing demand for electricity in modern society, the traditional power storage system can no longer meet the needs of social work, life, emergency and so on. For example, in the case of high-load operation, the problem of insufficient power supply capacity of the power supply transformer leads to staggering power consumption, which seriously affects production and life.

Under the national “dual carbon” strategy, new energy sources represented by photovoltaics and wind power are booming. With the large-scale access of photovoltaics and wind power, the demand for frequency regulation and peak regulation resources of the power grid has risen sharply. It plays an increasingly important role in enhancing the stability of the power grid and improving the utilization efficiency of the power distribution system. Electrochemical energy storage lithium-ion system, due to its low deployment environment requirements and many applicable scenarios, its application scale is growing rapidly. At the same time of large-scale application, the safety of energy storage power stations has also attracted widespread attention.

Energy storage container is a popular energy storage system in recent years. It integrates battery system, BMS and environmental monitoring system, etc., and the container itself is very convenient to move and install. In addition, the containerized energy storage system also has the advantages of long life, simple maintenance, cost saving, environmental protection, and less trouble.

The batteries of the energy storage container system are mostly lithium batteries, such as lithium iron phosphate batteries, in addition to all-vanadium flow energy storage batteries and lead-acid batteries. In addition to battery packs, dense wiring and other instruments also require fire safety to avoid possible fire hazards.


cold storage container 1


At present, energy storage containers have been widely used in large-scale infrastructure projects (such as highway construction, railway construction, tunnel construction, etc.). The reason why the project construction prefers the energy storage container for power supply is to value its efficiency and convenience. Compared with the traditional fixed energy storage power station, the energy storage container allows ocean and road transportation, with strong mobility and no geographical restrictions.

The energy storage container fire protection system is a set of fire protection systems for the interior of the Containerized Integration energy storage container, which is set up to ensure the stability and safety of the energy storage container system operation. In the selection of fire protection systems in the field of energy storage, its importance is also the top priority. Its characteristics determine that only gas fire extinguishing equipment can be used. The use of water-based or dry powder fire extinguishers will cause damage to internal equipment.


The technology of energy storage container


1. Modular energy storage technology


The first-generation lithium battery simply connects the battery packs into clusters, and the second-generation lithium battery adds some intelligent battery management units on the basis of the first-generation lithium battery.


energy storage container 2


2. Electrical protection of energy storage power station


Protection zone of energy storage power station: DC side is divided into DC energy storage unit protection zone, DC connection unit protection zone and confluence zone; AC side is divided into AC filter protection zone and transformer protection zone. There are overlapping parts between adjacent protection zones, ensuring that all electrical equipment is within the protection scope.


3. Thermal management of lithium battery


In order to meet the environmental conditions of the project site and the normal use of the battery pack and supporting equipment under the environmental conditions of the project site and the operating conditions of the system, the container conducts thermal management control through the following aspects, mainly including air conditioning, thermal management design, thermal insulation layer, etc., thermal management system The temperature in the container can ensure the normal operation of the battery pack and supporting electrical equipment.


During the operation of the lithium battery, due to the existence of the internal electrochemical reaction and the influence of the increase of the ambient temperature, the inner cavity temperature of the battery will increase and the reaction will be intensified; while in the alpine area, due to the influence of the low temperature of the environment, the reaction in the battery will also be reduced. speed. The former can lead to a thermal runaway that can cause premature battery failure and safety issues, and the latter can also reduce the battery’s charge-discharge capacity and efficiency.


4. Container fire safety


Fire-fighting devices are integrated in the container, and most of them adopt a structure of no less than three levels, including early warning, alarm and action, and fire-fighting system devices, including detection controllers, fire control boxes, sound and light alarm bells/lights, temperature and salt fog sensors, Perfluorohexanone gas fire extinguishing device. The installation principle of the detection controller should be close to the battery pack. Combined with the structure of the actual rack, the top space on the battery cabinet can be selected for installation. The fire extinguisher device adopts cabinet type heptafluoropropane fire extinguisher and aerosol fire extinguishing device. Among them, the cabinet type heptafluoropropane is installed in the battery room, and the aerosol automatic fire extinguishing series devices are installed in the electrical room.

With the wide range of energy storage container projects in many fields such as new energy power generation, grid side, industrial and commercial user side, power auxiliary services, microgrid, optical storage and charging station, energy Internet, smart energy, data center, energy saving transformation, shore power transformation and so on The application and the scale of the container power station of the energy storage power station are gradually advancing to the megawatt level, tens of megawatt level or even 100-megawatt level, marking a key step in the application of the lithium battery energy storage power station container system grid-side field. With the continuous breakthrough of lithium battery technology in the future, CIMC Yang Zhou Base as a container supplier, the cost of energy storage containers is expected to be greatly reduced, and the prospect is worth looking forward to.


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