Study On Design Of Thermal Batteries And The Impact Of Storage Time On Performance

This paper elaborates the current research situation and development trend in domestic and abroad, applications, advantages and disadvantages for thermal batteries. By studying the technical parameters of type-A thermal battery, the corresponding selection and calculation method of electrochemical system are obtained. Based on the research on basic data and a series of experiment verification, the key technical problem is solved. According to practical requirements, after the life extension experiment for type-B thermal battery, high temperature accelerated ageing simulation is utilized to simulate the battery s storage time and then verify that whether its performance can be satisfied after storage for 14 or 18 years. Furthermore,The activation time of type-C thermal battery is fitted by mathematical analysis software when their storage times are different, and the prediction of activation times after storage can be achieved.1) Based on the technical characteristics of thermal batteries, the current mature electrochemical system of Li Si/Li Br, Li Cl, Li F/Fe S2 molten salt is chosen, which satisfies the user s requirements, saves cost to some extent, and shows the excellent performance of the system in power output, pulse current and high specific energy.2)This paper gathers type-B batteries in 10 groups and confirms the life extension programs. Then all batteries are checked the seals themselves, dissected for analysis their materials so as to verify whether an exception occurs or not, and proceeded to accelerated aging experiment validation. As a result, the following results are obtained. The batteries capacities have little to do with their sealings(within the national requirements), and the storage time increases as the working time increases but decreases at the early stage. However, after the battery is stored to a certain period of time until the water in the battery is completely reacted, its working time keeps almost stable. The working time of type-B battery in the experiment keeps almost unchanged after storage for 14 and 18 years, and so this experiment accumulates some valuable data for the life-extension test.3) By the discharge for different storage period of type-C thermal battery] their activation times are recorded, and the battery activation times are fitted by using the mathematical analysis software. Then a nonlinear regression model is developed for predicting the activation time of thermal battery after storage.