Research And Design Of Thermal Management System For Power Battery Based On The Effect Of Phase Change Energy Storage And Peltier

With the rapid development of new energy vehicles,the power battery thermal management as the core technology of a vehicle has been paid much more attention.However,commonly used air and liquid cooling technology at present stage has a high cost,complicated structure and short service life.PCM(Phase change material)temperature control technology is a new high-efficiency and energy-saving thermal management technology,which is expected to replace the traditional air-cooling and liquid-cooling technology,becomes the preferred solution for thermal management of power battery.However,at present,the phase change materials have such problems as low thermal conductivity,easy leakage and poor mechanical properties.The safety and reliability of the system still need to be investigated.Therefore,it is of great practical significance to design a phase change materials power battery thermal management system with high safety and reliability,usability,efficient and environmental protection.In this paper,a power battery thermal management system based on phase change energy storage and Peltier effect is designed.Firstly,polyethylene paraffin was used to graft maleic anhydride(MAH)under the action of benzoyl peroxide(BPO)to improve the molecular polarity and latent heat.The thermal conductivity of the composites was improved by grafting paraffin wax with expanded graphite.On the basis of the modified composite phase-change materials,the design scheme of the phase-change materials battery thermal management system is put forward by integrating phase-change energy storage,Peltier effect,as well as the auxiliary system.Structurally,composite materials were prepared by means of melting,heating,stirring and cold-pressing technology.The composition of Single battery and phase change materials are uniformly distributed in the aluminum matrix shell.Heat pipe was used to enhance heat dissipation.In the hardware part of the control system,thermocouple temperature measurement,i-7018 data acquisition card,tm-c8,PCB circuit board and solid state relay are used to control the current direction of the thermoelectric chip,namely the refrigeration and heating state.In the software part,LaVIEW programming language is used to realize the collection of temperature data,the judgment of data,the control of tm-c8 potential output,achieving the automatic control of system temperature.Based on the implementation scheme of the thermal management system,a set of experimental models with practical significance is assembled.On the simulation platform,a cylindrical heating rod with a diameter of 18 mm and height of 65 mm is used to simulate the heating of the battery.The power of 3 W,5 W and 10 W heating rods is used to simulate the state of battery under different operating conditions.Natural cooling and forced air cooling are used as the comparison group,and the maximum temperature and maximum temperature difference as the reference standard.The results show that under different working conditions,the thermal management based on phase change energy storage and Peltier effect is more efficient and environment-friendly than the forced air-cooling technology under different conditions.