Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Electrochemical cells with tabs

a technology of electrochemical cells and tabs, which is applied in the direction of cell components, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of high contact impedance, brittle joints, and other unacceptable performance-related problems, and achieve the effect of stable metallic tabs and low contact impedan

Inactive Publication Date: 2010-11-11
LEYDEN ENERGY
View PDF26 Cites 70 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0082]The flexible carbon sheeting, such as carbon nanotubes or graphite sheet for the practice of the present invention provides particular advantages in achieving low contact resistance. By virtue of its high ductility, conformability, and toughness it can be made to form particularly intimate and therefore low resistance contacts with electrode structures that may intentionally or unintentionally proffer an uneven contact surface. In any event, in the practice of the present invention, the contact resistance between the positive electrode and the graphite current collector of the present invention preferably does not exceed 50 ohm-cm2, in one instance, does not exceed 10 ohms-cm2, and in another instance, does not exceed 2 ohms-cm2. Contact resistance can be determined by any convenient method as known to one of ordinary skill in the art. Simple measurement with an ohm-meter is possible.

Problems solved by technology

Coupling between the tabs and the electrodes can be difficult especially for cells having graphite sheet current collectors.
This dissimilarity in material properties can lead to high contact impedance, brittle joints or other unacceptable performance-related problems.
Unfortunately, these methods are not suitable for attaching a metallic tab to a graphite based current collector.

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
  • Electrochemical cells with tabs
  • Electrochemical cells with tabs
  • Electrochemical cells with tabs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015]The term “alkyl”, by itself or as part of another substituent, includes, unless otherwise stated, a straight or branched chain hydrocarbon radical, having the number of carbon atoms designated (i.e. C1-8 means one to eight carbons). Examples of alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, t-butyl, isobutyl, sec-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, and the like.

[0016]The term “alkylene” by itself or as part of another substituent includes a linear or branched saturated divalent hydrocarbon radical derived from an alkane having the number of carbon atoms indicated in the prefix. For example, (C1-C6)alkylene is meant to include methylene, ethylene, propylene, 2-methylpropylene, pentylene, and the like. Perfluoroalkylene means to an alkylene where all the hydrogen atoms are substituted by fluorine atoms. Fluoroalkylene means to an alkylene where hydrogen atoms are partially substituted by fluorine atoms.

[0017]The terms “halo” or “halogen,” by themselve...

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

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Login to View More

Abstract

The present invention provides electrochemical cells and batteries having one or more electrically conductive tabs and carbon sheet current collectors, where the tabs are connected to the carbon sheet current collectors; and methods of connecting the tabs to the carbon based current collectors. In one embodiment, the electrically conductive tabs are metallic tabs.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This application is a continuation application of the PCT Patent Application No. PCT / US2009 / 0036400, filed on Mar. 6, 2009, which claims priority to U.S. Provisional Application No. 61 / 034880, filed on Mar. 7, 2008, the disclosure of each is hereby incorporated by reference in its entirety for all purposes.BACKGROUND OF THE INVENTION[0002]In recent years, the demand for high performance batteries has increased, driven in part by the increasingly large number of portable consumer electronics products and growing needs of batteries for fuel efficient vehicles. Lithium-ion batteries are found in many applications requiring high energy and high power densities, as they can provide high volumetric and gravimetric efficiency in battery packs for use in portable electronic devices and in fuel-saving vehicles.[0003]Lithium-ion cells require tabs for making the connections between their internal active material and external power terminals. The t...

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
IPC IPC(8): H01M2/02H01M4/02H01M10/14H01M10/36H01M50/534H01M50/536H01M50/571
CPCH01M2/26Y10T29/49108H01M10/0525H01M4/663Y02E60/10Y02P70/50H01M50/534H01M50/536H01M4/661H01M10/0568H01M50/531
Inventor JUZKOW, MARCPATEL, AAKARLUI, JUNTIKHONOV, KONSTANTINERICKSON, MICHAELHAIDARI, HASHMATNAGY, THOMASDAI, HONGLI
Owner LEYDEN ENERGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com