| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 106 === Due to the rapid development of mobile devices and electric vehicles in recent years, lithium-ion batteries which supply and store electrical energy have become extremely important. In order to meet the demand of the market, battery capacity has gradually increased over the past few years, which often leads to significant temperature rise during charging and discharging by large current flow. Therefore, thermal stability of the battery becomes one of the most important and urgent issues when it comes to battery safety.
For traditional lithium-ion batteries, the internal electrolyte is a flammable material which means it has poor thermal stability; while the relatively new all-solid-state lithium battery has better thermal stability, it has limited in capacity. To keep the best of both batteries, semi-solid-state lithium battery using the combination of both solid and liquid electrolyte was born.
In this work, an one-dimensional electrochemical model for this new breed of battery is proposed. This model can not only be used to simulate the charge-discharge behavior and the temperature change of the battery, but also obtaining charge-discharge curve data with merely a few battery parameters. This results in reduction of numbers of batteries needed for experiment, which is great save of time and cost.
Battery penetration test is one of the items of battery safety test, and the battery temperature is used as an indicator to judge the results. Therefore, the temperature of the penetrated battery is extremely important. The battery penetration model will be a great help in the battery research, if we can only use some experiment parameters to simulate the battery temperature after penetration. In some literature of battery penetration experiments, they set up different simulated model to predict the battery temperature change. In this thesis, we will compare each model and sort out the best set up to simulate the battery temperature change. The model has one-dimensional electrochemical of semi-solid-state lithium-ion battery and three-dimensional heat transfer. In the end, the experimental results of the ITRI were compared to verify the accuracy of the simulated model.
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