Design And Control Technology Research Of Aluminium Oxide Silver Battery Heat Balance System

Battery is an electrochemical device that electrochemical oxidation and reduction reactions occurring on the electrode,changing chemical energy into electrical energy.Ideally,all of these discharge energy should be converted into useful electricity energy,however the energy loss caused by the internal resistance and the polarization of the battery were inevitable,these energy was released in the form of heat.Aluminum silver oxide battery as a primary power source of the next generation torpedoes,it has been reported abroad that the output power can reach 500 kw,cabin specific energy can reach 163 wh/kg,almost a 2 to 4 times that of other battery systems.However,large output power in a short time is bound to release a lot of heat,a part of the heat is required for maintain the temperature of the battery reaction,another part is need to be in the form of waste heat which will be released into the seawater.In this paper,the heat generated during aluminum silver oxide battery operation was analyzed and summarized,which obtained the way that the heat transfers from the inside of the battery to the sea,and the battery thermal power factors.The results show that the battery casing can be divided into two sections which were controlled cooling section and uncontrollable segment cooling portion,through adjusting the temperature of controlled cooling section thermal power segment,and then adjust the cooling power of the entire segment of the battery,therefore the electrical performance output can be ensured with a suitable temperature range.To increase the reliability of the project,the mechanical thermostatic valve was used in battery temperature control.The core element of thermostatic valve is a thermostat unit.Through analysis and comparison,a solid-liquid phase transition thermostat unit was selected,whose stem stroke and temperature sensing element were designed and optimized by adding thermal agent into temperature sensitive wax,which can optimize the surface structure of the thermostat unit,in order to reduce the reaction hysteresis.In order to test the consistency of temperature control valve design,the thermostatic valve single simulation test system was established,and the result shows that a high precision temperature control valve temperature range,whose lag time range was from 12 s to 14 s.Therefore,the design fully met the application of aluminum silver oxide battery.Finally,a heat exchanger simulation model was established to analyze the impact of sea water flow rate,water temperature,the temperature of the electrolyte,the electrolyte flow,the impact of surface coating thickness on battery thermal power.The calculation formula of heat power was established,and the theoretical basis of the battery casing design was provided.There is some report of successful application of aluminum silver oxide battery in foreign countries,but China is still in the early research.The completion of this subject research is the key to the development of aluminum silver oxide battery,there are also a certain significance for other battery system in thermal design,it establishes the technical foundation for our country's new torpedo battery R&D work.