We provide solutions to Automotive OEM’s, Battery Manufacturer’s and start-ups to build Li-ion battery pack for their application. We provide the customizable Battery Management System (BMS) solutions for Li-ion batteries which will help increase the battery performance and life span of Li-ion batteries.
Why do we need BMS?
Due to their high efficiency and high energy density, lithium-ion batteries have been adopted for mobile electronic devices and electric vehicles. They have been increasingly used further for various applications,such as small mobility vehicles (electric motorcycles, E-Bikes, golf carts, etc.), stationary batteries for HEMS (Home Energy Management System), trucks or buses, and industrial machinery. However, Lithium-ion battery cells have two critical design issues:
1. if you overcharge them you can damage them and cause overheating and even explosion or flame so it’s important to have a battery management system to provide overvoltage protection.
2.Lithium ion cells can also be damaged if they’re discharged below a certain threshold, approximately 5 percent of total capacity. If the cells are discharged below this threshold their capacity can become permanently reduced.
Therefore To ensure a battery’s charge doesn’t go above or below its limits, a battery management system has a safeguard device called a dedicated Lithium-ion protector.
Functions of BMS
Cell Protection: Overvoltage Charging and Under-voltage Discharging Protection.
Energy Management: – It shows the State of Charge(SOC) and State of Health (SOH) of the battery.
Prevention of Charge imbalance occurred in the individual cells from the Battery pack module: A battery pack usually consists of several individual cells that work together in combination. As an ideal case, all the cells in a battery pack should be kept at the same state of charge. If the cells go out of balance, individual cells can get stressed and lead to premature charge termination and a reduction in the overall cycle life of the battery.
Thermal Management: Lithium-ion batteries are designed to operate at specific temperature range (10oC to 55oC). Overheating causes liquid electrolyte in the cells to degrade, melting of polymer separator can cause internal short circuit etc. problems. Cooling below minimum temperature may cause very low ionic conductivity so battery will not work at all. So BMS must monitor temperatures at various part of battery pack and maintains the temperature in the pack.
Detection and Isolation of Faults: BMS should be able to detect and isolate the faults, it may be individual cell damage, short-circuit etc.