Palo Alto Research Center Inc.

Lars Wilko Sommer

Peter Kiesel

Ajay Raghavan

Bhaskar Saha

Alexander Lochbaum

Tobias Staudt

Saroj Kumar Sahu

Anurag Ganguli

Hoe Jin Hah

Geun-Chang Chung

Chang-Jun Bae

Mohamed Alamgir

Julian Schwartz

Bokkyu Choi

Gyu-Ok Hwang

A system includes a first optical sensor sensitive to both a parameter of interest, Parameter1, and at least one confounding parameter, Parameter2 and a second optical sensor sensitive only to the confounding parameter. Measurement circuitry measures Min response to light scattered by the first optical sensor, where M=value of Parameter1+K*value of Parameter2. The measurement circuitry also measures Min response to light scattered by the second optical sensor, where M=value of Parameter2. Compensation circuitry determines a compensation factor, K, for the confounding parameter based on measurements of Mand Mtaken over multiple load/unload cycles or over one or more thermal cycles. The compensation factor is used to determine the parameter of interest.

Method and system to separate optically measured coupled parameters

A battery includes a folded bicell battery stack with an embedded fiber optic cable and sensor. A cell casing encloses the bicell stack with at least one fiber optic cable is embedded within the battery. The fiber optic cable includes an internal portion disposed within the cell casing and having at least one optical sensor disposed thereon. An external portion of the fiber optic cable protrudes from the casing. A sealing gasket is disposed at least partially around the fiber optic cable and between the cell sealing edges at a point of entry of the fiber optic cable into the battery.

Embedded fiber optic cables for battery management

A method for determining an operating state (e.g., state-of-charge or state-of-health) and/or generating management (charge/discharge) control information in a system including an electrochemical energy device (EED, e.g., a rechargeable Li-ion battery, supercapacitor or fuel cell) that uses optical sensors to detect the intercalation stage change events occurring in the EED. The externally or internally mounted optical sensors measure operating parameter (e.g., strain and/or temperature) changes of the EED during charge/recharge cycling, and transmit measured parameter data using light signals sent over optical fibers to a detector/converter. A processor then analyzes the measured parameter data, e.g., using a model-based estimation process, to detect intercalation stage changes (i.e., crystalline structure changes caused by migration of guest species, such as Li-ions, between the EED's anode and cathode), and generates the operating state and charge/discharge control information based the analysis.

Method for monitoring/managing electrochemical energy device by detecting intercalation stage changes

A battery management system includes one or more fiber optic sensors configured to be disposed within an electrochemical battery. Each fiber optic sensor is capable of receiving input light and providing output light that varies based on the input light and an amount of free or dissolved gas present within the battery. A detector detects the output light and generates an electrical detector signal in response to the output light. Battery management circuitry determines the state of the battery based at least in part on the detector signal.

Battery management based on internal optical sensing

A system includes utilizes optical sensors arranged within or on portions of an electrochemical energy device (e.g., a rechargeable Li-ion battery, supercapacitor or fuel cell) to measure operating parameters (e.g., mechanical strain and/or temperature) of the electrochemical energy device during charge/recharge cycling. The measured parameter data is transmitted by way of light signals along optical fibers to a controller, which converts the light signals to electrical data signal using a light source/analyzer. A processor then extracts temperature and strain data features from the data signals, and utilizes a model-based process to detect intercalation stage changes (i.e., characteristic crystalline structure changes caused by certain concentrations of guest species, such as Li-ions, within the electrode material of the electrochemical energy device) indicated by the data features. The detected intercalation stage changes are used to generate highly accurate operating state information (e.g., state-of-charge and state-of-health), and management/control signals for optimizing charge/discharge rates.

Monitoring/managing electrochemical energy device using detected intercalation stage changes

Sensor material is arranged to interact with input light and to asymmetrically alter a spectral distribution of the input light in response to presence of an external stimulus. A detector is configured to sense the altered input light and to generate at least one electrical signal comprising information about a shift in the centroid of a spectral distribution of the altered input light relative to a centroid of the spectral distribution of the input light.

Growing community of inventors

Bretten, Germany

Lars Wilko Sommer