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Battery Management Systems (BMS)

solar battery perth

Battery Management Systems (BMS) plays a critical role in most new energy storage technology. The role of the BMS is to

  1. Facilitate the safe charging and discharging of lithium ion batteries;
  2. Gather and analyse data to increase operational performance and cell longevity;
  3. Forecast throughput and capacity attenuation given variable battery conditions; and
  4. Provide better State of Health (SoH) metrics and maintenance information.
battery management systems

Distributed Battery Management System (Source: Wikipedia)

In order to achieve the points mentioned above for battery management systems, the following parameters in the table below could be monitored for the following use:

ParameterUse
VoltageUnder/Over Voltage for basic BMS Safety and State of Charge (SoC)

dV/dt for charge / discharge magnitude and duration

TemperatureUnder/Over Temperature for basic BMS Safety

dT/dt for extrapolation of internal stress

CurrentFor Coulomb counting to substantiate SoC

dI/dt for determination of internal resistance

Internal pressureMonitor for charge retention attenuation and SoH indicator

dP/dt for internal battery fault warning

BMS – Lithium Ion Vs. Lead Acid 

As compared to Lead Acid batteries, Lithium-ion batteries are being used to deliver higher-quality performance in a safer, longer-lasting package, as detailed below:

Feature/ BatteryLithium IonLead Acid
WeightOne-third
Efficiency during charging and rapid discharging100% efficientDrops
Can be discharged  100%50% to 80%
Cycle Life – Rechargeable 1500 to 2000300 to 400
Voltage during discharge cycleMaintain constant voltageDrops voltage consistently
Life Cycle/ Upfront cost Low/ HigherHigh/Lower
Environmental ImpactCleaner technology, safer