Abstract
In the last decade, lithium ion batteries have dominated the market place: first being used in portable consumer products, and now in more industrial and transport-based applications. One necessary requirement of lithium ion batteries -- irrespective of the particular application of interest -- is to gauge how much energy the battery contains and how long a given application can run before the battery needs to be recharged. The precise monitoring and management of lithium ion batteries has proven to be difficult to achieve, especially as the battery starts to age. Here, I describe a novel patented approach that Cadex Electronics Inc., is developing, which assesses the state of charge and state of health of lithium ion batteries by directly measuring the concentration of lithium ions across different states of charge. Directly assessing the electrochemical state of the battery assures very precise monitoring -- conservatively speaking, +/- 5% accuracy, irrespective of which lithium ion chemistries are tested.
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New Advances in Lithium Ion Battery Monitoring (pdf)
