Amprius, Inc.

Element Energy, Inc.

Quantumscape Corporation

Quantumscape Battery, Inc.

Maxim Integrated Products, Inc.

Leland Stanford Junior University

Other

Honda Motor Co., Ltd.

Quantrumscape Corporation

Rainer Johannes Fasching

Ghyrn E Loveness

Timothy P Holme

Georgy Zerkalov

Arnaud Devie

Seth Marshall Kahn

Song Han

Anthony John Stratakos

Joseph Han

Corrado Cammi

Weston Arthur Hermann

Zhebo Chen

Zuqin Liu

Friedrich B Prinz

Anderson Rennie John

Yoosok Saw

Marie A Mayer

Constantin Ionel Stefan

Yi Cui

Bradley Owen Stimson

Cheng Chieh Chao

Jagdeep Singh

William S Delhagen

Eugene Michael Berdichevsky

Tim Holme

Karl M Brown

Jason Allen Wortham

Mark Charles Platshon

Aram Yang

Gregory Alan Roberts

William S DelHagen

Mohit Singh

Will Hudson

Eric Tulsky

Robert Lane Smith

Tiffany Ho

Nathan Thomas Brinkerhoff

Jon Shan

Kyle Hammerick

Greg Roberts

Tina Alikahi

Ralph S Greco

Hushnak Singh

Wei Zhang

Arnold Allenic

Andrei Teodor Iancu

Neil Dasgupta

Hitoshi Iwadate

Jingning Shan

Shicheng Xu

Ye Tao

Hee Joon Jung

WonHyoung Ryu

Phil Reilly

Graeme R Hoste

Seoung Jai Bai

Bradley O Stimson

Described herein are methods and systems for detecting variation in minor total-impedance contributors in sets of electrochemical cells. For example, a method comprises maintaining a substantially constant current through the set of electrochemical cells and obtaining multiple voltage readings of the cells while the substantially constant current is maintained. The method then proceeds with determining multiple differential capacity values from the multiple voltage readings, characterizing one or more peaks in the multiple differential capacity values, and determining the variation in the minor total-impedance contributor based on one or more peaks. More specifically, partial capacitance values can be assigned to different impedance channels based on these peaks or, more specifically, based on the separation of adjacent peaks. The variation in the minor total-impedance contributor can be attributed to one or more of a tap-weld quality, electrolyte wetting, tape damage, active material activation energy variations, and diffusion variation of the ion-conducting material.

Methods and systems for detecting variations in minor total-impedance contributors in electrochemical cells

Described methods and systems are used for in-situ impedance spectroscopy analysis of battery cells in multi-cell battery packs. Specifically, the cell impedances are determined while the pack continues to operate, such as being charged or discharged. For example, the pack voltage/power output remains unchanged while this analysis is initiated, performed, and ended. Cell impedance is determined based on the cell's response to the signal applied to the cell. For example, a current through the cell is charged while monitoring cells' voltage response. Although the power output of the changes during this testing, but the operation of the pack is not impacted due to the power compensation provided by one or more other cells in the pack thereby ensuring uninterrupted operation of the pack. This in situ testing is provided by the unique architecture of the pack, comprising multiple nodes and individual node controllers.

Methods and systems for in-situ impedance spectroscopy analysis of battery cells in multi-cell battery packs

A method for thermal management performed by a controller of an energy storage system, where the energy storage system includes at least a first battery module, a second battery module, a first battery management system (BMS) node, and a second BMS node. The first BMS node is configured to control operation of the first battery module, and the second BMS node is configured to control operation of the second battery module. The method includes (a) determining a first temperature profile difference representing a difference between an actual temperature profile of the first battery module and a desired temperature profile of the first battery module, (b) determining a first operation adjustment representing a desired change in operation of the first battery module for decreasing the first temperature profile difference, and (c) controlling the first BMS node to change operation of the first battery module according to the first operation adjustment.

Systems and methods for thermal management of an energy storage system

Described herein are methods and systems for updating SOC estimates of individual cells in battery packs. Specifically, SOC estimates are updated in-situ, e.g., while the battery packs remain operational. For example, a cell is charged or discharged, independently from other cells, until the cell OCV is at a set value, corresponding to one of target zones. The target zones have more prominent correlations between the OCV and SOC than other parts of the OCV profile. A new SOC value, corresponding to the cell OCV, is used to update the SOC estimate. In some examples, a set of voltages is obtained while the cell is charged or discharged at a constant current/power, e.g., outside of the target zones. One or more differential capacities are determined from this voltage set, and a new SOC value is obtained based on these differential capacities.

Methods and systems for updating state of charge estimates of individual cells in battery packs

Described methods and systems provide in-situ leakage current testing of battery cells in battery packs even while these packs operate. Specifically, an external electrical current is discontinued through a tested battery cell using a node controller, to which the tested battery cell is independently connected. Changes in the open circuit voltage (OCV) are then detected by the node controller for a set period time. Any voltage change, associated with taking the tested cell offline, is compensated by one or more other cells in the battery pack. The overall pack current and voltage remains substantially unchanged (based on the application demands), while the in-situ leakage current testing is initiated, performed, and/or completed. The OCV changes are then used to determine the leakage current of the tested cell and, in some examples, to determine the state of health of this cell and/or adjust the operating parameters of this cell.

Methods and systems for on demand in-situ leakage current testing

A method for managing a plurality of stacks of electrochemical cells, where the plurality of stacks are electrically coupled in parallel in a battery. The method includes (a) operating the plurality of stacks to execute a global operating strategy, (b) controlling one or more first power converters to change operation of one or more first stacks of the plurality of stacks to execute a first local operating strategy of operating the one or more first stacks at one of a constant power and a constant current, and (c) controlling one or more second power converters to change operation of one or more second stacks of the plurality of stacks to compensate for change in operation of the one or more first stacks caused by executing the first local operating strategy, and thereby maintain the global operating strategy of the battery while executing the first local operating strategy.

Controllers for managing a plurality of stacks of electrochemical cells, and associated methods

A method for adaptive electrochemical cell management in an energy storage system including a plurality of battery management system (BMS) nodes, the method including (1) obtaining a first signal identifying one or more degradation mechanisms of a first cell assembly of a first BMS node of the plurality of BMS nodes, the first cell assembly including one or more first electrochemical cells, and (2) controlling a first BMS node controller of the first BMS node in response to the first signal, to change a state of operation of the first cell assembly to mitigate the one or more degradation mechanisms of the first cell assembly, independently of operation of a second BMS node of the plurality of BMS nodes.

Systems and methods for adaptive electrochemical cell management

Provided herein are electrochemical cells having a solid separator, a lithium metal anode, and a positive electrode catholyte wherein the electrochemical cell includes a nitrile, dinitrile, or organic sulfur-including solvent and a lithium salt dissolved therein. Also set forth are methods of making and using these electrochemical cells.

Catholytes for solid state rechargeable batteries, battery architectures suitable for use with these catholytes, and methods of making and using the same

The present invention is directed to battery system and operation thereof. In an embodiment, lithium material is plated onto the anode region of a lithium secondary battery cell by a pulsed current. The pulse current may have both positive and negative polarity. One of the polarities causes lithium material to plate onto the anode region, and the opposite polarity causes lithium dendrites to be removed. There are other embodiments as well.

Pulse plating of lithium material in electrochemical devices

A method for managing a plurality of stacks of electrochemical cells, where the plurality of stacks are electrically coupled in parallel in a battery. The method includes (a) operating the plurality of stacks to execute a global operating strategy of the battery, (b) changing respective operating points of one or more first stacks of the plurality of stacks to execute a local operating strategy, and (c) changing respective operating points of one or more second stacks of the plurality of stacks to maintain the global operating strategy of the battery while executing the local operating strategy.

Methods and systems for in-situ leakage current testing of cells in multi-cell battery packs

An integrated circuit device includes a controller, a voltage source coupled to the controller, a voltage sampler coupled to the controller, a to current detector coupled to the controller and memory coupled to the controller, where memory includes code segments executable by the controller for: (a) measuring a cell voltage to determine an initial voltage; (b) holding the cell voltage at the initial voltage using a power source; and (c) determining the leakage current of the cell by the current provided by the current power source with a low current detector. The power source can be one or both of a voltage source and a current source.

Battery cell analyzer

A system for enhanced object detection and identification is disclosed. The system provides new capabilities in object detection and identification. The system can be used with a variety of vehicles, such as autonomous cars, human-driven motor vehicles, robots, drones, and aircraft and can detect objects in adverse operating conditions such as heavy rain, snow, or sun glare. Enhanced object detection can also be used to detect objects in the environment around a stationary object. Additionally, such systems can rapidly identify and classify objects based on the encoded information in the emitted or reflected signals from the materials.

System for object detection

Growing community of inventors

Mill Valley, CA, United States of America

Rainer Johannes Fasching