Battery state of charge indicator with an auxiliary cell

摘要

A state of charge indicator may include an indicator with a display threshold and an auxiliary cell having an auxiliary cell voltage. The auxiliary cell may be electrically coupled to the indicator such that when a difference between a main cell voltage of a main cell and the auxiliary cell voltage is less than the display threshold, the indicator is inactive and when the difference between the main cell voltage and the auxiliary cell voltage is greater than or about equal to the display threshold, the indicator is active.

主权项

1. A state of charge indicator, comprising:
a first step indicator with a first display threshold; a first auxiliary cell having a first auxiliary cell voltage, the first auxiliary cell is electrically coupled to the first step indicator such that when a difference between a main cell voltage of a main cell and the first auxiliary cell voltage is less than the first display threshold, the first step indicator is inactive and when the difference between the main cell voltage and the first auxiliary cell voltage is greater than or about equal to the first display threshold, the first step indicator is active; a second step indicator with a second display threshold, and a second auxiliary cell with a second auxiliary cell voltage, the second auxiliary cell is electrically coupled to the main cell and the second step indicator such that when the difference between the main cell voltage and the second auxiliary cell voltage is less than the second display threshold, the second step indicator is inactive and when the difference between the main cell voltage and the second auxiliary cell voltage is greater than or about equal to the second display threshold, the second step indicator is active; and wherein the first display threshold is greater than the second display threshold.