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Battery management systems (BMS) play a crucial role in ensuring the safety, performance, and longevity of batteries used in zero emission vehicles. As zero emission vehicles rely primarily on rechargeable energy storage systems, particularly lithium-ion batteries, maintaining optimal operating conditions becomes essential. A BMS acts as the central electronic control unit that monitors, protects, and manages battery packs during charging, discharging, and idle conditions. Without an efficient BMS, batteries may suffer from thermal instability, reduced lifespan, and even catastrophic failure due to uncontrolled chemical reactions inside the cells. One of the primary contributions of a BMS is ensuring battery safety by continuously monitoring voltage levels of individual cells within the battery pack. In electric vehicles, battery packs are composed of multiple cells connected in series and parallel configurations. If one cell operates beyond its safe voltage limits, it can lead to overcharging or deep discharging, which significantly increases the risk of thermal runaway. Thermal runaway is a dangerous phenomenon where excessive heat generation inside a battery triggers uncontrollable chemical reactions, leading to fire or explosion risks. The BMS prevents such occurrences by disconnecting the charging circuit or balancing the charge among cells when abnormal voltage variations are detected. Temperature management is another critical safety function of a BMS in zero emission vehicles. Battery performance and chemical stability are highly dependent on operating temperature. Extreme heat accelerates chemical degradation, reduces electrolyte stability, and increases internal resistance. On the other hand, extremely low temperatures can reduce ion mobility and lower battery efficiency. The BMS incorporates temperature sensors distributed across the battery pack to continuously monitor thermal conditions. _____ ________ __________ _____ _______ ______ _____ ________ ______ _________.
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