公开(公告)号：US20210215768A1

公开(公告)日：2021-07-15

申请号：US16743848

申请日：2020-01-15

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Alfred Zhang ,  Justin Bunnell ,  Garrett M. Seeman ,  Jeffrey S. Piasecki ,  Charles W. Wampler ,  Brian J. Koch ,  Jing Gao ,  Jeffrey A. Bednar ,  Xiumei Guo ,  Justin R. McDade

IPC: G01R31/3832 ,  G01R31/3842 ,  G01R31/388 ,  H01M10/48 ,  H01M10/42

Abstract: A method for battery capacity estimation is provided. The method includes monitoring a sensor, collecting a plurality of data points including a voltage-based state of charge value and an integrated current value, defining within the data points a first data set collected during a first time period and a second data set collected during a second time period, determining an integrated current error related to the second data set, comparing the integrated current error related to the second data set to a threshold integrated current error. When the error related to the second data set exceeds the threshold, the method further includes resetting the second data set based upon an integrated current value from the first time period. The method further includes combining the data sets to create a combined data set and determining a voltage slope capacity estimate as a change in integrated current versus voltage-based state of charge.

公开(公告)号：US11034257B2

公开(公告)日：2021-06-15

申请号：US16245507

申请日：2019-01-11

Applicant: GM Global Technology Operations LLC

Inventor： Garrett M. Seeman ,  Justin Bunnell ,  Ciro A. Spigno

IPC: B60L58/12 ,  B60L50/60 ,  B60L50/51

Abstract: A method for estimating remaining energy in a battery pack having series-connected cells/cell groups includes measuring battery parameters, including a battery voltage, current, and temperature. The controller estimates a static state of charge difference (ΔSOC) value and a current-dependent ΔSOC value in real-time using the parameters, including calculating the static ΔSOC value as a difference between an average SOC of the battery pack and an SOC of a weakest/lowest energy cell group. The current-dependent ΔSOC value is a percentage SOC per unit of the current. The static ΔSOC value and current-dependent ΔSOC values are filtered via a multi-parameter state estimator block. Using the filtered state values, the controller executes a control action responsive to the estimated remaining energy, including displaying the remaining energy and/or a quantity derived from the remaining energy via a display device. A powertrain system includes the controller, electric machine, and battery pack.

公开(公告)号：US20200223322A1

公开(公告)日：2020-07-16

申请号：US16245507

申请日：2019-01-11

Applicant: GM Global Technology Operations LLC

Inventor： Garrett M. Seeman ,  Justin Bunnell ,  Ciro A. Spigno

IPC: B60L58/12 ,  B60L50/51 ,  B60L50/60

Abstract: A method for estimating remaining energy in a battery pack having series-connected cells/cell groups includes measuring battery parameters, including a battery voltage, current, and temperature. The controller estimates a static state of charge difference ( ΔSOC) value and a current-dependent ΔSOC value in real-time using the parameters, including calculating the static ΔSOC value as a difference between an average SOC of the battery pack and an SOC of a weakest/lowest energy cell group. The current-dependent ΔSOC value is a percentage SOC per unit of the current. The static ΔSOC value and current-dependent ΔSOC values are filtered via a multi-parameter state estimator block. Using the filtered state values, the controller executes a control action responsive to the estimated remaining energy, including displaying the remaining energy and/or a quantity derived from the remaining energy via a display device. A powertrain system includes the controller, electric machine, and battery pack.