Patents by Inventor Samuel Yeong-Shi Chang

Samuel Yeong-Shi Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Margin-based battery charge balancing
    Patent number: 9728820
    Abstract: A battery pack management system adjusts the relative state-of-charge of respective battery blocks in a battery pack to equalize (i.e., align, balance or otherwise make similar) the peak battery block voltages (i.e., maximum or “upper peak” battery block voltages when the battery pack is being charged and/or minimum or “lower peak” battery block voltages when the battery is being discharged). Upon detecting an anomalous battery block that exhibits outlier upper and lower peak voltages, the battery pack management system adjusts the relative state of charge of respective battery blocks to center their respective upper and lower peak voltages between operating limits, thus maximizing the operating margin of the battery pack as a whole.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: August 8, 2017
    Assignee: Atieva, Inc.
    Inventors: Steven Diamond, Gabriel Risk, Stanley Hu, Samuel Yeong-Shi Chang
  • Method of controlling battery state using constant-voltage discharge
    Patent number: 9472968
    Abstract: A battery is rendered to a consistent discharged state in a two-phase battery discharge operation. In a first of the two discharge phases, a constant discharge current is drawn from the battery until a threshold battery voltage is reached. In the second of the two discharge phases, executed after the threshold battery voltage is reached during the first-phase, a time-varying discharge current is drawn from the battery at a constant battery voltage until a threshold discharge current is reached.
    Type: Grant
    Filed: September 21, 2015
    Date of Patent: October 18, 2016
    Assignee: Atieva, Inc.
    Inventors: Albert Liu, Samuel Yeong-Shi Chang, Wilson Liu, Steve Diamond
  • Method of controlling battery state using constant-voltage discharge
    Patent number: 9142977
    Abstract: A battery is rendered to a consistent discharged state in a two-phase battery discharge operation. In a first of the two discharge phases, a constant discharge current is drawn from the battery until a threshold battery voltage is reached. In the second of the two discharge phases, executed after the threshold battery voltage is reached during the first-phase, a time-varying discharge current is drawn from the battery at a constant battery voltage until a threshold discharge current is reached.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: September 22, 2015
    Assignee: ATIEVA, Inc.
    Inventors: Samuel Yeong-Shi Chang, Albert Liu, Wilson Liu, Steve Diamond
  • PEAK-EQUALIZED BATTERY CHARGE BALANCING
    Publication number: 20130257381
    Abstract: A battery pack management system adjusts the relative state-of-charge of respective battery blocks in a battery pack to equalize (i.e., align, balance or otherwise make similar) the peak battery block voltages (i.e., maximum or “upper peak” battery block voltages when the battery pack is being charged and/or minimum or “lower peak” battery block voltages when the battery is being discharged). Upon detecting an anomalous battery block that exhibits outlier upper and lower peak voltages, the battery pack management system adjusts the relative state of charge of respective battery blocks to center their respective upper and lower peak voltages between operating limits, thus maximizing the operating margin of the battery pack as a whole.
    Type: Application
    Filed: March 29, 2012
    Publication date: October 3, 2013
    Inventors: Steven Diamond, Gabriel Risk, Stanley Hu, Samuel Yeong-Shi Chang