Lithium sulfur rechargeable battery fuel gauge systems and methods

a rechargeable battery and lithium sulfur technology, applied in the direction of measurement devices, instruments, transportation and packaging, etc., can solve the problems of reducing the maximum capacity of the battery with the “age” of the battery, and the above-described conventional open-circuit voltage-based algorithms do not use stored look-up tables, etc., to achieve accurate determination of the state of charge of lithium sulfur battery cells

Inactive Publication Date: 2009-02-26
SION POWER CORP
View PDF8 Cites 54 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is an object of this invention to provide systems and methods for accurately determining the state of charge of lithium sulfur battery cells.
[0009]It is also an object of this invention to provide such systems and methods for accurately determining the age of battery cells.

Problems solved by technology

However, the maximum capacity of a battery degrades with the “age” of the battery (i.e., the number of charge / discharge cycles to which the battery has been subjected, and not the actual amount of time that the battery has existed).
The above-described conventional open-circuit voltage-based algorithms do not use stored look-up tables that adequately represent the characteristics of the battery as it ages to determine its state of charge.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium sulfur rechargeable battery fuel gauge systems and methods
  • Lithium sulfur rechargeable battery fuel gauge systems and methods
  • Lithium sulfur rechargeable battery fuel gauge systems and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016]The present invention provides systems and methods for accurately determining the state of charge of lithium sulfur battery cells. In accordance with one aspect of this invention, look-up tables or algorithms for each type of lithium sulfur battery are prepared and stored in a computer chip or database. In various embodiments of the present invention, this chip or database may preferably be embedded in the lithium sulfur battery / charger system itself or within the load-drawing device. These look-up tables correlate cell resistance (“CR”) at various ambient temperatures and ages of the battery, for example, versus state of charge (“SOC”) for various types of lithium sulfur battery.

[0017]Unlike other common battery systems, a lithium sulfur battery includes a cathode whose active chemical material experiences a progression of redox reactions during discharge. These reactions involve polysulfide reduction from higher polysulfides (e.g., Li2S8), to the intermediate polysulfides, a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Systems and methods for accurately determining the state of charge and the relative age of lithium sulfur batteries are provided. The cell resistance and taper input charge of a particular type of lithium sulfur battery are respectively measured to determine the state of charge and age of the battery.

Description

RELATED APPLICATIONS[0001]This application is a divisional of U.S. patent application Ser. No. 11 / 111,262, entitled, “Lithium Sulfur Rechargeable Battery Fuel Gauge Systems and Methods,” filed on Apr. 20, 2005, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates generally to the charging of lithium sulfur batteries, and more particularly to systems and methods for accurately determining the state of charge and the relative age of lithium sulfur batteries.[0003]The ability to discern how much energy is stored in a rechargeable battery of a portable consumer electronic device, such as a cellular telephone or laptop computer, is a feature that is highly valued by the user of the device. Therefore, common device systems, such as those using lithium-ion, nickel metal hydride, or nickel-cadmium rechargeable batteries, incorporate some technique to gauge the amount of energy or charge presently stored in the battery cell. One common appr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): G01R31/36H02J7/04
CPCG01R31/3679G01R31/3662G01R31/392G01R31/389G01R31/36
Inventor KELLEY, TRACY EARLSCORDILIS-KELLEY, CHARICLEAPUGLISI, VINCENT JOHN
Owner SION POWER CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap