Energy storage containers are portable energy storage devices that are often used for power backup. Thermal dissipation in energy storage batteries is a key factor in determining their performance, safety and lifetime. In order to maintain the temperature in the container at the normal operating temperature of the battery, the main heat dissipation structures of current energy storage container can be classified into two categories: air cooling and liquid cooling.
  • The air-cooled system uses air as a cooling medium and uses convective heat exchange to reduce the temperature of the battery. The air-cooled system has the advantage of being simple in construction, easy to maintain and low in cost.  The disadvantage is that air has a low specific heat capacity and a very low thermal conductivity, which makes air cooling typically used in applications with low heat production rates.
  • Liquid cooling systems use liquid as a cooling medium and carry away the heat generated by the battery through convective heat exchange. Its structural form: one or more bent water pipes buried within an enclosure wall. When in use, connect the inlet and outlet of the pipe to an external circulating water supply system. The circulating water supply system sends cold water to the pipes and flows through them.  The cold water flowing along the pipe absorbs the heat from the wall, which is dissipated by the battery. And then the cold water heats up, and the heated water returns from the outlet of the pipe to the circulating water supply system.
How do you choose between air and liquid cooling? The choice of power storage temperature control technology is the result of a comprehensive consideration of factors such as safety, economy, battery pack design, and the environment in which it is located, rather than a simple consideration of cooling performance.
AIR COOLING OR LIQUID COOLING in power storage container
Large-scale power storage technology is the key technology for smart grid, new energy generation and grid connection, power load shifting and valley filling. Lithium-ion batteries have been widely used in many fields due to their high energy density, low self-discharge rate, smooth discharge voltage, long cycle life and other advantages, and the application of lithium batteries in large-scale power storage systems will become an inevitable trend in technology development. In order to ensure the efficient and safe application of lithium-ion solar battery storage (Battery Energy Storage System, BESS), all components of the system must be integrated and optimized, and managed and controlled in a reasonable and effective manner.
 
The battery management technology and system integration technology of energy storage systems can be developed to improve the safety, reliability and service life of the battery system and promote the popularization and application of large-scale power storage. The key technologies include:
(1) advanced battery management technology ;
(2) temperature monitoring and management technology;
(3) state of health (SOH) monitoring technology;
(4) system integration technology.
solar power energy storage systems
Solar system with battery backup​ is mainly composed of four parts, including Battery System (BS), Power Conversion System (PCS), Battery Management System (BMS), and Monitoring System; at the same time, in practical application, for the convenience of design, management and Meanwhile, in practical applications, the BS, PCS and BMS are usually recombined into modular BESS for easy design, management and control, while the monitoring system is mainly used to monitor, manage and control one or more modular BESS.
  • The battery system is the main carrier of BESS to store and release electrical energy, and its capacity and operation status are directly related to the energy conversion capacity and safety reliability of BESS.
  • The PCS is a device consisting of power electronic conversion devices that connects the battery system to the AC grid and is a key component of the energy exchange between the BESS and the outside world.
  • BMS is a real-time monitoring system composed of electronic circuit equipment, which can effectively monitor various states of the battery system (voltage, current, temperature, charge state, health state, etc.), safely manage the charging and discharging process of the battery system (such as preventing overcharging and over-discharging management), alarm and emergency protection treatment of possible battery system faults, and optimize the control of battery system operation, and ensure safe, reliable and stable operation of the battery system
structure diagram of solar battery storage systems