Optimize The Thermal Design Of Battery Module With A Small Energy Storage System

The current world energy problems are becoming increasingly prominent. People areconstantly developing new types of sustainable energy, on the other hand, increaseinvestment at a reasonable and effective use of energy. Energy storage systems play aincreasingly apparent role in all aspects of production, transportation, storage and the useof power resources. It is also play a role in terms of balance capacity, improve powerquality, backup energy. As a new type of lithium iron phosphate batteries, with itsoutstanding safety performance, are now getting more attention. In the field of energystorage systems, A123Systems, Inc. and BYD are created a MW-class lithium ironphosphate energy storage station. Since lithium iron phosphate suitable operatingtemperature0℃-45℃, and the temperature difference in the same battery tray need to becontrolled within3℃. Therefore, battery energy storage system thermal design andoptimization modules is necessary and has a important practical significance.The paper is using SolidWorks2014as a design software, SolidWorks FlowSimulation are as the finite element simulation software tools. Optimize the thermal designof battery box module with a small energy storage system are as the research object.First of all, through some experimental methods measuring the iron phosphatelithium core, capacity, internal resistance, discharge platform and cycle life are affected bytemperature.Secondly, simplified3D modeling batteries modules. References and simplifiedcalculation module batteries thermal physical parameters: density, specific heat, thermalconductivity, etc. And, set the battery module under normal temperature conditions: aconstant current of1C continuous discharge, the surface temperature of the modulebatteries and optimize cooling solutions based on simulation results. The results indicatethat，the maximum temperature of module is41℃, the maximum temperature difference ofeach module is6℃.Finally, in this paper, a parallel optimized battery cabinet cooling mode and increasethe baffle in the inlet duct, so that the cooling air into several tributaries relatively constant in order to achieve uniform cooling purposes. Through simulation, the final battery packconditions, the maximum temperature of the battery module is35℃, the maximumtemperature difference of each module within2.8℃, meet the design objectives.