Join us at COMSOL Day Southfield for product demonstrations, talks by invited speakers, chats with our technical and sales staff, and the opportunity to exchange ideas with other simulation specialists. This event will showcase use cases from various industries.
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Come to this session to hear about the new features in COMSOL Multiphysics® version 5.4 and to learn how they can be incorporated into your existing multiphysics models.
Multiphysics Modeling of Internal Short Circuits and Thermal Runaway of Li-Ion Batteries
Internal short circuits and the subsequent heat release induced by electrochemical reactions has been a primary cause to trigger Li-ion battery thermal runaway. Given the different dominant physical-chemical processes associated with internal short circuits and thermal runaway, a decouple-recombine approach is adopted to reveal this complex phenomenon from detailed modeling and computations.
On one hand, the thermal response and chemical kinetic feature of thermal runaway is computationally investigated in a three-dimensional configuration with detailed runaway chemistry and assigned heat source intensity, to mimic an accidental heat source. The threshold runaway state has been identified, corresponding to a pairing of critical heat source intensity and critical duration time, below which thermal runaway cannot occur. A sensitivity analysis has been conducted to evaluate the dominant thermal chemical and physical parameters triggering thermal runaway. Material dependence of thermal runaway has also been characterized by comparing different Li-ion battery cathodes, such as lithium cobalt oxide (LiCoO2) and lithium nickel manganese cobalt (NMC).
On the other hand, the evolution of current, voltage, and power dissipation rate fields during a representative internal short circuit scenario is computationally investigated by solving species, charge, and energy conservation equations accounting for electrochemistry. The internal short circuit current could be an order of magnitude higher than the 1C current, and the maximum average power dissipation rate is found to be in the order of 1012 W/m3. Interestingly, the time scale of the heat release rate evolution from electrochemistry is found to be very close to the critical duration time predicted using the thermal runaway chemistry, indicating the consistency of the models developed to describe these two phenomena. The detailed power dissipation density predicted from electrochemistry is then used as input for the heat resource in the thermal runaway calculation to demonstrate the coupling of the electrochemical and thermal abuse model. This work provides useful guidance to the fundamental understanding and prediction of thermal runaway phenomena induced by an internal short circuit in a Li-ion battery.
We will perform a product demo of the Optimization Module with a focus on advanced features such as shape and topology optimization.
Attend this session to learn about the capabilities of the COMSOL Multiphysics® software in structural mechanics and related areas. Among other things, we will discuss the newly released Composite Materials Module and the material activation/deactivation feature in the Structural Mechanics Module, which can be used to simulate additive manufacturing and similar processes.