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How Can Current Measurement Offset Make Coulombic Efficiency Appear to Exceed 100%?
One common reason that measured coulombic efficiency…
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Four notes most engineers read first.
Accuracy and Precision, Part 1: OverviewThe difference between accuracy and precision in battery testing, and why both matter.How to Measure DC Internal Resistance (DCIR)How MITS measures DC internal resistance with the pulse method, and how to set the pulse.How to Run an HPPC Test (Hybrid Pulse Power Characterization)The DOE pulse profile, resistance and pulse power equations, cycler requirements, and a worked 18650 test on the HPS.How to Use Formulas and Variables in MITS SchedulesControl a test with formulas and variables instead of fixed values.
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How Can Current Measurement Offset Make Coulombic Efficiency Appear to Exceed 100%?
One common reason that measured coulombic efficiency (CE) can appear to exceed 100% is a current measurement offset. In this example, assume the cycler has a constant negative current offset e. This means the measured current is lower than the true current by e throughout the test. To simplify the analysis, assume an ideal battery […]
Accuracy and Precision: Impact of Precision
We previously examined the impact of measurement accuracy in an earlier article. In this article, we shift our focus to the influence of a battery tester’s precision on battery research. In many research applications, parameters such as dV/dt and dQ/dV are widely used. The reliability of these measurements depends heavily on the precision of the […]
Accuracy and Precision: Impact of battery tester’s accuracy
In the previous article, we introduced the concepts of accuracy and precision, along with a brief overview of their influence on battery testing. In this article, we will take a deeper look at the impact of accuracy. We will take an example about the impact on capacity measurement and Coulombic Efficiency measurement. As we all […]
Accuracy and precision: Overview
1. Introduction Battery testing is fundamentally a measurement task. Whether evaluating cycle life, coulombic efficiency, voltage response, or degradation mechanisms, the quality of conclusions depends on the quality of the data. Two concepts govern data integrity in any battery test system: accuracy and precision. Although often mentioned together, they describe different aspects of measurement performance. […]
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