Gm Global Technology Operations LLC

Other

Jun-Mo Kang

Chen-Fang Chang

Hanho Yun

Paul M Najt

Vijay A Ramappan

Man-Feng Chang

Tang-Wei Kuo

Jyh-shin Chen

Allen B Rayl, Jr

Nicole Wermuth

Insu Chang

Dave G Rich

Barry L Brown

Orgun A Guralp

Peter Kafarnik

Yiran Hu

Sai S V Rajagopalan

James A Eng

Yongjie Zhu

Zongxuan Sun

SeungHwan Keum

Chen-fang Chang

Charles W Wampler, Ii

Steven E Muldoon

Junfeng Zhao

Young J Kim

Dongxu Li

Rashmi Prasad

Muhammad Hussain Alvi

Matthew A Wiles

Mohamed Ahmed Kamel Ahmed

Chandra S Namuduri

Chunhao J Lee

Yue-Yun Wang

Jonathan T Shibata

Ethan E Bayer

Alan Wayne Brown

Oguz H Dagci

Mohamed Kamel

David J Brooks

Jeffrey A Morgan

Hejie Lin

Donald K Grimm

Lyall Kenneth Winger

Ibrahim Haskara

Taeyoung Han

Gregory Paul Matthews

Kwang-Keun Shin

Shifang Li

Andrew Paul Bagnasco

Kevin Andrew Gady

Nicholas W Pinto

Hossein Javaherian

Martino A Casetti

Thompson M Sloane

Robert A De Stefano

Jay H Sim

Hanho Kang

Gunter Gräwert

Xueyu Zhang

Madhumita Ramesh Babu

A battery system includes: at least two battery modules, each including at least three strings of battery cells that are configured to, at different times be: connected in series and to a first positive terminal via first switches; connected in parallel and to a second positive terminal via second switches; and disconnected from both of the first and second positive terminals; and a switch control module configured to: during operation in a first power mode: determine periods of phases, respectively; and determine periods for the strings, respectively, to be connected to the second positive terminal during the phases; during operation in a second power mode: set the periods of the phases, respectively, to be equal in length; and set the periods for the strings, respectively, to be equal in length; and selectively actuate the switches based on the periods of the phases and the periods for the strings.

String and module switching control systems and methods for mode transitions

A battery monitoring system for a vehicle includes a processor and a memory. The memory stores instructions for causing the processor to estimate a state of charge of a battery based on a current cell pressure of the battery while the state of charge of the battery is below a threshold state of charge and to estimate a state of charge of the battery based on a voltage output by the battery while the state of charge of the battery is greater than or equal to the threshold state of charge.

Battery pack state of charge estimation

A method for controlling a vehicle charging and thermal operation includes monitoring at least a charge characteristic of a battery system and a thermal characteristic of the battery system. The method predicts a battery system temperature at a future time (t) based at least in part on the monitored characteristics using a predictive physics model and maintains the battery system temperature above a minimum temperature threshold and below a maximum temperature threshold by adjusting a charging profile based at least in part on the predicted battery system temperature.

Predictive control for proactive thermal and energy management charging

A vehicle system includes DC/DC converters configured to receive electrical currents from high voltage battery modules and output regulating electrical currents to a low voltage battery. The vehicle system includes a control system coupled to the DC/DC converters, the high voltage battery modules, and the low voltage battery, where the control system is configured to control the DC/DC converters to recirculate one or more of the electrical currents back to one or more of the high voltage battery modules in order to balance states of charge in the high voltage battery modules.

Optimal control strategy for a distributed low voltage system with bidirectional direct current converters

A vehicle includes an electrical system for balancing a state of charge in a battery pack. The electrical system includes a plurality of module groups. A switch array includes a plurality of switches. Each switch is coupled to a respective module group. The switch can be in one of a first state that connects the module group to a first low voltage bus, a second state that connects the module group to a second low voltage bus, and a third state in which the module group is disconnected from both the first low voltage bus and the second low voltage bus. The array is placed in a first phase of a mode of operation with at least one switch in one of the first state and the second state and cycles through the phases of the mode to balance a charge between the plurality of module groups.

Low-cost balancing control for distributed low voltage system with bi-directional converters to support multiple low voltage busses

Aspects of the disclosure include the detection of battery cell degradation. An exemplary battery management system can include a memory, computer readable instructions, and one or more processors that perform operations that include: responsive to determining that a charging state has completed, measuring a first cell voltage of a cell of the battery pack; responsive to the first cell voltage exceeding a reference voltage, measuring a second cell voltage of the cell of the battery pack; responsive to the second cell voltage being equal to the reference voltage, measuring a cell pressure of the cell of the battery pack at the reference voltage; determining a difference between the cell pressure and a prior cell pressure at the reference voltage; and responsive to the difference between the cell pressure and the prior cell pressure exceeding a threshold, identifying the cell of the battery pack as a degraded cell.

Early detection of battery cell performance degradation

A battery system includes: first and second positive terminals and a negative terminal; switches; at least two battery modules, each of the battery modules including at least three strings of battery cells configured to, at different times be: connected in series and to the first positive terminal via first ones of the switches; connected in parallel and to the second positive terminal via second ones of the switches; and disconnected from both of the first and second positive terminals; and a switch control module configured to: receive temperatures of the strings of battery cells, respectively; determine temperatures of the battery modules, respectively, based on the temperatures of the strings of battery cells of that battery module; and selectively actuate the switches based on at least one of: minimizing an error between the temperatures of the strings of battery cells; and minimizing an error between the temperatures of the battery modules.

Thermal management of battery modules and strings

A battery system includes: switches; two battery modules, each of the two battery modules including three strings of battery cells configured to, at different times be: connected in series and to a first positive terminal via first ones of the switches; connected in parallel and to a second positive terminal via second ones of the switches; and disconnected from both of the first and second positive terminals; and a switch control module configured to: determine state of charges (SOCs) of the strings of battery cells, respectively; determine, using model predictive control, periods of phases, respectively, to balance SOCs of the battery modules; determine, using model predictive control, periods for the strings, respectively, to be connected during the phases to balance the SOCs of the strings of battery cells; and selectively actuate the switches based on the periods of the phases and the periods for the strings of battery cells.

Battery string state of charge balancing systems and methods

A battery system includes: two battery modules, each including three strings of battery cells that are configured to, at different times be: connected in series and to a first positive terminal via first ones of switches; connected in parallel and to a second positive terminal via second ones of the switches; and disconnected from both of the first and second positive terminals; and a switch control module configured to: determine state of charges (SOCs) of the strings of battery cells, respectively; determine, using model predictive control, periods of phases, respectively, to balance SOCs of the battery modules; determine, using model predictive control, periods for the strings, respectively, including setting one of the periods for one of the strings to be included in at least two of the phases; and selectively actuate the switches based on the periods of the phases and the periods for the strings of battery cells.

Battery string state of charge balancing with phase sharing

A vehicle, system and method of operating a battery having a plurality of modules, each module having a plurality of strings. The vehicle includes the battery. A processor operates the plurality of modules in a first phase of a mode of operation, calculates a model-predicted path vector for the first phase based on a time for reducing a difference between states of charges of the plurality of strings, selects between the model-predicted path vector and a default path vector based on an operating parameter of the battery, and switches operation of the plurality of modules from the first phase to a second phase using the selected one of the model-predicted path vector and the default path vector.

Switching control selection logic in high-speed loop in MODACS

A battery system includes: two battery modules, each including three strings of battery cells that are configured to, at different times be: connected in series and to a first positive terminal via first ones of switches; connected in parallel and to a second positive terminal via second ones of the switches; and disconnected from both of the first and second positive terminals; and a switch control module configured to: determine state of charges (SOCs) of the strings, respectively; determine periods of phases, respectively, based on the SOCs; determine first periods for connecting ones of the strings in parallel; divide one of the phases into N equal length periods; selectively decrease N; when a number of the first periods that end closest to one of N period endings is at least a predetermined value, adjust the first periods to the respective closest ones of the N period endings.

Switch duration setting for battery string state of charge balancing

A battery system includes: a first positive terminal, a second positive terminal, and a negative terminal; at least two battery modules, each including switches and at least three strings of battery cells configured to, via the switches, at different times be: connected in series and to the first positive terminal; connected in parallel and to the second positive terminal; and disconnected from both of the first and second positive terminals; and a switch control module configured to, when a fault is diagnosed in one of the strings of one of the battery modules: at least one of: actuate the switches and isolate the one of the battery modules from the first and second positive terminals; and actuate the switches and isolate the one of the strings from the first and second positive terminals; and selectively actuate the switches of the remainder of the battery modules using model predictive control.

Switching of battery strings and modules when a fault is diagnosed in a battery string

A vehicle includes a propulsion system having multiple electric motors. A battery system is connected to the electric motors via a direct current to direct current (DC-DC) converter and an inverter. The battery system includes a battery assembly having a plurality of battery modules. Each of the battery modules has multiple individual battery cells arranged in battery packs, a set of sensors configured to monitor a set of parameters of each battery pack, and a plurality of battery pack mounts. Each battery pack mount includes a base plate and a top plate and an actuator configured to alter a distance between plates. A monitoring unit is configured to monitor a value representative of a battery pack pressure, determine whether the value falls within a pressure threshold window, and maintain the value within the pressure threshold window by actively altering the battery pack pressure.

Battery pressure active control

Examples described herein provide a method that includes providing a first electric power pathway from a battery to a first auxiliary low voltage bus via a direct-current (DC)/DC converter and a first switch. The method further includes providing a second electric power pathway from the battery to a second auxiliary low voltage bus via the DC/DC converter and a second switch. The method further includes selectively controlling at least one of the first switch or the second switch to manage a load in one of the first auxiliary low voltage bus or the second auxiliary low voltage bus based at least in part on the battery or the load.

Load sharing for multiple auxiliary low voltage buses of vehicles

A vehicle, system and method of detecting an internal short in a battery pack of the vehicle. The system includes a plurality of sensors and a processor. The plurality of sensors obtains states of charge at battery cells of the battery pack. The processor discharges the battery pack to identify a first set of the battery cells based on the states of charge of the battery cells, charges the battery pack to identify a second set of the battery cells based on the states of charge of the battery cells, and generates an alarm when an intersection of the first set and the second set is non-empty.

Method for early detection of an internal short in a battery pack

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Ann Arbor, MI, United States of America

Jun-Mo Kang