ELECTROCHEMICAL CELL MONITORING AND BALANCING CIRCUIT WITH SELF-DIAGNOSTIC FEATURE

摘要

A system and method for measuring a voltage of electrochemical cells of a pack. The system includes circuit elements individually associated with respective electrochemical cells of the pack and having electrical characteristics that are different such that individual electrochemical cells can be distinguished from one another. The system also includes a measurement circuit configured to measure the voltage of the electrochemical cells and to identify an electrochemical cell being measured based on an electrical characteristic of a circuit element associated with the electrochemical cell. Various self-diagnostic techniques are described, as well as techniques for measuring sense resistance, reducing sense resistance, and measuring changes in voltage of a cell over time.

主权项

1. A method of monitoring an electrochemical cell, the method comprising:
measuring a change in voltage over a time period as the electrochemical cell charges or discharges; and determining, based at least partially on the change in the voltage over the time period, a range of the state of charge of the electrochemical cell.