ACTIVE MEASUREMENT OF BATTERY EQUIVALENT SERIES RESISTANCE

摘要

A circuit for measuring the equivalent series resistance (ESR) of a battery includes taking measurements of battery current and battery voltage. A controller may control the taking of the measurements. A load generator may be activated to produce a current pulse to the battery to provide an explicit current transient under certain operating conditions of the battery.

主权项

1. A method in a circuit to determine an equivalent series resistance (ESR) of a battery, the method comprising:
measuring, at a first time, a first current flow through the battery to obtain a first current measurement, when the battery is connected to the circuit; measuring a first voltage across the battery concurrently with measuring the first current flow to obtain a first voltage measurement; measuring, at a second time, a second current flow through the battery to obtain a second current measurement; measuring a second voltage across the battery concurrently with measuring the second current flow to obtain a second voltage measurement; and when a difference between the first current measurement and the second current measurement exceeds a predetermined value, then computing the ESR by dividing a difference between the first and second voltage measurements by a difference between the first and second current measurements.