Active Measurement Cancellation

Ability to accurately measurenear-real-time impedance of a component even in an energized system in seconds.The ability to measure impedance of acomponent, in situ, without modifying the circuit.Uninterrupted and unimpairedoperation of battery module.Greater insight into polarizationeffects.

Electric vehicle systemsPortable electronics, such as phones,laptops, and wearablesEnergy storage systems

Researchers at INLhave developed a method known as Active Measurement Cancellation (AMC) formeasuring impedance. This new method is effective for measurement of isolatedcomponents as well as active, interconnected circuits, allowing impedancemeasurement in situ. The AMC circuit is capable of cancelling the effects ofthe interconnected circuit, measuring only the response of the desired component,e.g. a battery cell, thereby allowing accurate, immediate, impedancemeasurements of the components even when in use.

This technology hasbeen tested and validated at the bench scale. Additional development will berequired to integrate this technology into a commercially viable product. BEAmay be in a position to support additional research and development of thistechnology under a mutually acceptable Cooperative Research & DevelopmentAgreement (CRADA), Strategic Partnership Projects (SPP), or similar agreementsubject to prior approval of DOE.

Fact Sheet: "Active Measurement Cancellation- Measuring Battery Assembly Performance Without Interruption"

Intellectual Property:

This invention hasassociated intellectual property U.S. Patent No. 9,519,031,BEA Docket No. BA-671: “Circuits and Methods for Impedance Determination UsingActive Measurement Cancellation.” issued 13 Dec 2016.

USA