Key Findings
Innovative utilization of phase change materials (PCMs) is gaining significant attention in electric vehicle (EV) battery thermal management systems (BTMS). PCMs are promising as a passive cooling method, effectively mitigating transient heat loads through their latent heat absorption capacity, but have faced challenges due to low thermal conductivity and limited heat dissipation. This research details optimal coolant allocation strategies using model predictive control and hybrid systems combining liquid cooling with PCMs, demonstrating the potential to significantly enhance EV battery performance, safety, and lifespan through integrated tab-surface cooling of battery cells.
Technical / Clinical Details
Conventional PCMs, while possessing high energy storage density, suffer from low thermal conductivity in their solid state, which impedes effective heat dissipation. To overcome this, the current study proposes a hybrid cooling strategy that combines PCMs with active liquid cooling systems. Notably, a novel approach involves integrating a Model Predictive Control (MPC) algorithm to optimize coolant flow and PCM utilization in real-time based on battery operating conditions. This MPC predicts data such as battery cell temperature distribution, state of charge, and ambient conditions, integrally managing cooling from both tab connections and surfaces. Simulations confirm this precision thermal control can suppress maximum battery temperature rise by approximately 15% and improve temperature uniformity by 20%. This is expected to reduce battery degradation rates and extend cycle life by up to 25%.
Background & Context
With the widespread adoption of EVs, battery thermal management has become a critically important factor for vehicle performance, safety, and durability. High battery temperatures can lead to performance degradation, rapid capacity fade, and an increased risk of thermal runaway. Current BTMS primarily rely on liquid or air cooling, but these systems can be complex and energy-intensive. PCMs, with their ability to maintain battery temperature within a stable range using high latent heat, are seen as complementary or alternative solutions to these challenges. This research represents a crucial step towards fully realizing the potential of PCMs and developing more efficient and reliable BTMS.
Strategic Significance & Outlook
This innovative thermal management technology holds significant implications for EV battery pack design. In the future, smaller, lighter, and more efficient battery systems could be realized, contributing to extended EV range and faster charging times. The research team plans to proceed with prototype development and demonstration tests for this MPC-based PCM hybrid cooling system. They will also explore combinations with different types of PCMs and cooling media to further enhance performance. If commercialized, this technology is expected to accelerate the growth of the EV market and deepen consumer trust in EVs by improving battery reliability and safety.
Source: https://arxiv.org/html/2607.10872v1
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