Patent · US Expired

Circuit and method for monitoring the operational reliability of rechargeable lithium cells

US6570364B2 · kind B2 · utility

2Cited by

2References

8Claims

0Family size

Assignee

Microbatterie GmbH · DE

Inventors

Rainer Haid · Ellwangen, DE
Peter Birke · Hohen Neuendorf, DE
Konrad Holl · Aalen, DE
Dejan Ilic · Ellwangen (Jagst), DE

Key dates

Filing date	Jan 25, 2002
Grant date	May 27, 2003
Priority date	—
Expiry date	Jan 25, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E60/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method for monitoring the operational reliability of rechargeable lithium cells including measuring the cell voltage and cell temperature, the cell is discharged if a predetermined cell limit voltage (UG) and a predetermined ambient limit temperature TG are exceeded at the same time, until a predetermined lower voltage level or a predetermined lower ambient temperature is reached. A circuit for carrying out the method has a first threshold value switch which responds when a predetermined upper limit voltage (UG) is exceeded in the cell, and a second threshold value switch (C) which responds when a predetermined ambient temperature limit (TG) is exceeded, and has a logic circuit (E) which connects (G) the cell to a load when the first and second threshold value switches respond at the same time, wherein both threshold value switches (C, D) are configured such that they trip when a lower cell voltage or a lower ambient temperature is reached.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.