Study On Structure Design And Thermal Characteristics Of High Energy Efficiency Battery Compartment For Deep-sea Equipment

In recent years,with the gradual depletion of traditional energy sources,mankind has turned its sights to the more resource-rich oceans.In order to better explore Marine resources,underwater observation instruments and equipment are needed.As we all know,the ocean is a high pressure and low temperature environment,which will seriously reduce the discharge efficiency of instrument batteries and reduce their working time.Therefore,this paper designs a kind of high-efficiency battery cabin that supplies power to the ocean observation instrument.By adding insulation materials,the battery discharge efficiency under low temperature environment is improved to a certain extent,and the working time of the observation instrument is extended.First of all,based on the ocean dive observation instrument working time and the system information such as the work needed to power,according to the rule of pressure vessel design to design the "golden ratio" cylindrical battery compartment with the "big buoyancy" spherical tank two battery compartment to power the observation instruments,the two battery tank strength calculation and stability checking,establish the battery compartment structure and size,and three dimensional model is established by using Solidworks software,using the finite element software further finite element simulation analysis was carried out on the two kinds of battery compartment,using numerical simulation method of stress analysis and optimization,to determine the final plan.Then,the basic way of heat transfer is studied by studying the electrochemical reaction during the discharge of lithium battery.Taking lithium thionyl chloride battery as the research object,this paper analyzes the principle of chemical reaction and the law of heat transfer of lithium battery from inside to outside,and theoretically calculates the heat released by the discharge of lithium battery.The battery pack was designed according to the structure of the battery cabin and the working voltage of the observation instrument,and the influence of convective heat transfer coefficient on the internal heat of the battery pack was studied by ANSYS Workbench simulationsoftware.By studying the heat transfer mode and the heat conduction basis,the heat transfer path of the battery cabin is obtained.On this basis,according to the internal capacity of the battery compartment and the structural size of the battery pack to design the appropriate size of insulation materials.A complete 3d model of the battery cabin with high energy efficiency was established.By simulating the discharge of the battery cabin with different insulation materials,the internal temperature of the battery cabin with different insulation materials was compared to determine the material with the best insulation effect.Finally,a single lithium battery is tested under the condition of discharging with insulation material,and the experimental result is the same as the simulation result.The finished battery compartment and battery pack will be sent to liuhua 16-2 sea area in the south China sea to deploy subsurface beacon for real-time warning.After the battery cabin can complete the specified task,the subsurface buoy will be recovered,which proves that the insulation effect of the battery cabin meets the task requirements.Through the research in this paper,we successfully designed a kind of high-efficiency battery cabin for deep-sea equipment,which has accumulated certain experience for the field of insulation of battery cabin for Marine equipment in the future,and also contributes to more detailed exploration of the unknown ocean world.