Design Of Electrolyte Circulation System For Magnesium Seawater Power Battery

In today's world,AUV plays an increasingly important role in ocean strategy,ocean detection,and ocean search and rescue.With the development of the military-civilian integration strategy,a large number of universities and private companies have joined the AUV research and development boom.AUV has also developed a civilian version.With the wave of research and use of AUVs,the research and development of AUV power batteries has also become a hot topic,from ordinary batteries to water-activated batteries,but the internal structure of AUV is quite complicated,and the requirements for battery power are also relatively high.Excessive floating of the battery voltage may cause some components of the AUV to fail to work properly or even damage the components,so a strategy is needed to stabilize the output voltage of the battery.At present,widely used seawater activated batteries include magnesium seawater batteries,aluminum / silver oxide seawater activated batteries,etc.These batteries have one thing in common is that the reaction generates impurities,which affects the performance of the battery.This article takes magnesium batteries as an example.Magnesium is abundant in the earth's crust.Compared with lithium,it is cheaper,and has a higher theoretical discharge voltage.The electrode potential can reach 2.36 V.It is very suitable as an anode for seawater batteries,but when magnesium reacts with aqueous electrolytes Magnesium hydroxide and hydrogen are produced.Magnesium hydroxide will form a passivation film on the surface of the battery,causing the discharge voltage of the battery to drop.In addition,if magnesium hydroxide is left inside the battery,it will be filled between the electrodes,making the electrolyte lack,hindering ion migration,and causing premature cell and battery failure.Therefore,the electrolyte must be circulated.In response to the above problems,this paper has designed a special battery and auxiliary system for underwater vehicles(AUV).Using a robust PID controller,the inflow of new electrolyte can be controlled and thus maintain the temperature and conductivity of the electrolyte,and the performance of the battery will be significantly improved.In order to control circulation and flow,a circulation pump visible and voltage sensing device was added to the battery system.In this way,the temperature of the battery and the conductivity of the seawater electrolyte are increased.Since the temperature and conductivity directly cause the battery voltage to rise,a voltage sensing device is used to stabilize the output voltage of the battery by controlling the inflow of the electrolyte.Finally,build a MATLAB simulation model,compare the ordinary pid control model with the robust pid control model,and highlight the superiority of the robust pid control model.