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source:Industry News release time:2025-08-15 Hits: Popular:AG11 battery
Lithium-ion battery thermal management system (BTMS) design is a critical engineering process aimed at maintaining battery cells within an optimal temperature range (typically 20–40°C) to ensure safety, performance, and longevity. This system prevents excessive heat buildup during charging/discharging and minimizes temperature gradients across cells, which can cause uneven degradation and reduce battery life. The design involves integrating cooling/heating mechanisms, temperature sensors, and control algorithms to balance thermal conditions in various operating environments, from electric vehicles (EVs) to energy storage systems (ESS).
Passive and active cooling are the two primary strategies in BTMS design. Passive systems use materials like phase-change materials (PCMs) or heat sinks to dissipate heat without external energy input, making them lightweight and cost-effective for low-power applications. Active systems, however, employ forced air, liquid cooling (glycol-water mixtures), or thermoelectric coolers (TECs) to actively regulate temperature, suitable for high-power scenarios such as EVs or fast-charging stations. Liquid cooling, in particular, offers superior heat transfer efficiency, with channels embedded in battery modules to circulate coolant and uniformly remove heat.
Temperature monitoring is another key component, with thermistors or thermocouples placed strategically across the battery pack to track cell and module temperatures. These sensors feed data to a central controller, which adjusts cooling/heating output in real time. For example, during rapid charging, the controller may increase liquid flow rates to counteract heat spikes, while in cold climates, heating elements (e.g., resistive heaters) warm the cells to maintain performance.
Design considerations also include weight, space, and energy efficiency. In EVs, the BTMS must fit within tight packaging constraints without adding excessive weight, while in stationary ESS, energy consumption of active cooling systems should be minimized to avoid reducing overall efficiency. Advanced designs may integrate computational fluid dynamics (CFD) simulations to optimize coolant flow paths or use machine learning algorithms to predict thermal behavior, enhancing system responsiveness. A well-designed BTMS not only extends battery life by 30–50% but also mitigates risks of thermal runaway, a critical safety concern in lithium-ion technology.
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