Active Measurement Cancellation
- 技术优势
- 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.
- 技术应用
- Electric vehicle systemsPortable electronics, such as phones,laptops, and wearablesEnergy storage systems
- 详细技术说明
- 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.
- *Abstract
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Technology Marketing Summary:
Impedance measurements are used to assess the state andhealth of many systems, including structural crack measurements, stressindicators, and batteries. Electrochemical batteries lose capacity over theirservice lifetime, typically because battery use causes chemical degradationwith increasing resistance until it can no longer supply a useful amount ofpower. Impedance measurements are currently performed by placing a shunt inseries with the battery to determine battery current. The resulting battery currentand voltage are used to calculate battery impedance. This system works well forisolated batteries, but does not work for modules with many interconnectedbatteries and no provision for placing a shunt within the module. Using adifferent method, a measurement system injects a signal across a singlebattery, the signal response is a composite of the entire battery module andeverything connected to the module. The individual battery impedance isdistorted by all other connections to the battery. This same problem existswhen attempting to measure element impedance within any type of active circuit.
- 其他
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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.
- 国家/地区
- 美国
