For those transitioning from academia to industry or anyone new to this dynamic field, it’s essential to grasp the fundamental components of power batteries. Today, we’ll explore the three most crucial elements: cells, battery modules, and battery packs. 1. Cells: The Building Blocks
In more detail, let’s look at the critical components of a battery energy storage system (BESS). The battery is a crucial component within the BESS; it stores the energy ready to be dispatched when needed. The battery comprises a fixed number of lithium cells wired in series and parallel within a frame to create a module.
A battery cell is basically comprised of an anode, a cathode, a separator and an electrolyte. The cell chemistry (and material used in the cell) is one of the main contributors to the cost of a battery system. The materials used in fabrication of battery cells can be nickel, iron, cadmium, lithium, etc. depending on the type of battery.
Temperature is a critical factor in battery performance. The BMS incorporates temperature sensors throughout the battery pack to monitor heat levels. Excessive temperatures can lead to thermal runaway, damaging the battery. The BMS may adjust charging or discharging rates to prevent overheating. c. Current Sensors
The HVAC is an integral part of a battery energy storage system; it regulates the internal environment by moving air between the inside and outside of the system’s enclosure. With lithium battery systems maintaining an optimal operating temperature and good air distribution helps prolong the cycle life of the battery system.
Series and parallel battery cell connections to the battery bank produce sufficient voltage and current. There are many voltage-measuring channels in EV battery packs due to the enormous number of cells in series. It is impossible to estimate SoC or other battery states without a precise measurement of a battery cell .