Aim to optimise battery’s capacity utilisation, prevent overcharging and undercharging
A team of researchers from the Indian Institute of Technology (IIT), Guwahati, has developed an advanced technique to accurately estimate how much longer a battery can run.
The state of charge (SOC) reflects the remaining capacity of a battery or how much more charge is left. This helps optimise a battery’s capacity utilisation, prevents overcharging and undercharging, increases its lifespan, reduces cost and ensures safety. Such a vital parameter cannot be directly measured by any sensor.
The research team is also working on various other important battery issues such as cell balancing, monitoring state of health and state of power.
SOC can be estimated by using the available measured quantities such as battery terminal voltage and current. However, the highly non-linear characteristic of the lithium-ion battery makes it difficult to estimate the SOC accurately. Hence, a well-developed estimation algorithm is crucial to ensure precise, reliable and cost-effective SOC estimation.
The team consists of three members— research scholar Gautam Sethia, associate professor Sisir Kumar Nayak and professor Somanath Majhi. All of them are associated with the electronics and electrical engineering department at IIT Guwahati.
The researchers divided the problem into two parts. First, was to derive the mathematical model of the lithium-ion battery, which can closely exhibit its dynamic characteristics. Then, a few advanced system control and mathematical concepts were used to estimate the battery’s internal state precisely.
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