Atieva, Inc.

Samuel Yeong-Shi Chang

Albert Liu

Wilson Liu

Steve Diamond

Steven Diamond

Gabriel C Risk

Stanley Hu

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.

Margin-based battery charge balancing

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.

Method of controlling battery state using constant-voltage discharge

Growing community of inventors

Mountain View, CA, United States of America

Samuel Yeong-Shi Chang