Overview
Modern lithium-ion battery systems have safety, performance, and durability requirements that demand careful battery management to ensure operation within voltage, current, and temperature limits.
The Battery Management System (BMS) provides battery pack sensing, monitoring, protection, and control infrastructure to ensure that the system behaves according to specifications in terms of performance and longevity.
In this video, we will first accurately characterize the unit battery cell. Specifically, we will need to know its charge and discharge curve profiles, internal resistances, time constants, degradation rate, temperature, SOC, and aging dependencies.
Highlights
- Once the unit cell has been characterized, we will design a battery module by connecting unit cells in series and parallel to satisfy the DC bus voltage level and capacity requirements of the application.
- Subsequently, we will describe advanced state estimation techniques such as Kalman Filtering to determine SOC.
- A fundamental aspect of battery system design is an understanding of cell aging. Battery cells degrade over time, showing increasingly high internal resistance and progressive capacity fade.
- Finally, we will provide a BMS algorithm framework with production-code-ready architecture for hardware implementation. This will include current, temperature, voltage limitation, state logic, fault monitoring, cell balancing, and precharge contactor logic.
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