David R Mihara

US Patent:

7074516, Jul 11, 2006

Filed:

Feb 11, 2003

Appl. No.:

10/364792

Inventors:

Gregory J. Davidson - Oregon WI, US
David R. Mihara - Madison WI, US

Assignee:

Rovcal, Inc. - Madison WI

International Classification:

H01M 2/12
H01M 2/02

US Classification:

429 54, 429 56, 429165

Abstract:

An electrochemical cell is presented having a gasket that is sealed against the container to prevent electrolyte leakage during normal operation. When the internal pressure of the cell reaches a predetermined threshold, the seal is removed, thereby permitting electrolyte to escape through a vent.

US Patent:

7169504, Jan 30, 2007

Filed:

Feb 27, 2003

Appl. No.:

10/375381

Inventors:

Miguel E. Armacanqui - Madison WI, US
Ernest Ndzebet - Madison WI, US
William C. Bushong - Madison WI, US
Gregory S. Moy - Madison WI, US
Viet H. Vu - Verona WI, US
David R. Mihara - Madison WI, US
Jeffrey A. Poirier - Madison WI, US

Assignee:

Rovcal, Inc. - Fresno CA

International Classification:

H01M 4/62
H01M 4/42

US Classification:

429 59, 429212, 429217, 429229

Abstract:

A sulfonic acid type organic surfactant is incorporated into the gelled anode mixture of an alkaline electrochemical cell, optionally with an organic phosphate ester surfactant. Zinc fines may also be incorporated into the anode. The electrolyte included in the anode mixture may have a reduced hydroxide concentration. When a cell is provided whose anode mixture includes the two surfactants and zinc fines alone or in combination with a lowered hydroxide concentration in the electrolyte, discharge leakage is reduced and gel gassing is suppressed relative to that of gels lacking both surfactants. Additionally, cell discharge performance is improved relative to that of cells lacking both the zinc fines and lowered hydroxide concentration.

US Patent:

20030044686, Mar 6, 2003

Filed:

May 24, 2002

Appl. No.:

10/156326

Inventors:

William Bushong - Madison WI, US
Stephanie Curtis - Pardeeville WI, US
Gregory Davidson - Oregon WI, US
David Mihara - Madison WI, US
Gregory Moy - Madison WI, US
Ernest Ndzebet - Middleton WI, US
Michael Root - Verona WI, US
Viet Vu - Verona WI, US

International Classification:

H01M002/16
B05D005/12
B05D003/02

US Classification:

429/253000, 429/144000, 429/255000, 427/058000, 427/385500

Abstract:

An electrochemical cell is presented having an improved separator disposed at the interface of the anode and cathode. In particular, the separator conforms to the contour of the electrode and is thinner than conventional separators made of non-woven fabric. The conformal separator may be formed from combinations of certain polymers and inorganic crosslinking agents.

US Patent:

20040234860, Nov 25, 2004

Filed:

May 23, 2003

Appl. No.:

10/444189

Inventors:

Deyang Qu - Madison WI, US
Trevor Marshall - Oregon WI, US
Ken Redding - Boscobel WI, US
Tom Michaelis - Madison WI, US
David Mihara - Madison WI, US
Chris Garber - Lodi WI, US

International Classification:

H01M004/62
H01M004/50

US Classification:

429/232000, 429/224000, 252/182100

Abstract:

An electrochemical cell is provided whose cathode includes a graphite mixture having regular graphite and modified graphite having an average surface area greater than that of the regular graphite. The modified graphite has an aspect ratio greater than or equal to 1.2, and may be present at a concentration less than 25% relative to the graphite mixture.

US Patent:

20120328912, Dec 27, 2012

Filed:

Jun 19, 2012

Appl. No.:

13/527089

Inventors:

Hongbo Zhang - Duluth GA, US
David Robert Mihara - Cumming GA, US
Xiangjun Wang - Woodstock GA, US

Assignee:

EXIDE TECHNOLOGIES - Milton GA

International Classification:

H01M 4/00
H01M 4/04
H01M 2/12

US Classification:

429 53, 429 94, 296231

Abstract:

A winding assembly including positive and negative electrodes and a separator sheet wound in an overlying relationship such that the separator sheet is positioned between the positive and negative electrodes, and such that an exposed edge of the positive electrode is spaced longitudinally from an unexposed edge of the negative electrode at one end, and such that an exposed edge region of the negative electrode is spaced longitudinally from an unexposed edge of the positive electrode at an opposite end, and wherein a portion of the positive electrode proximate to the exposed edge of the positive electrode comprises a first plurality of apertures and a portion of the negative electrode proximate to the exposed edge of the negative electrode comprises a second plurality apertures.

US Patent:

20130145613, Jun 13, 2013

Filed:

Dec 10, 2012

Appl. No.:

13/709394

Inventors:

Xiangjun Wang - Woodstock GA, US
Hongbo Zhang - Duluth GA, US
David Robert Mihara - Cumming GA, US
John Harold Miller - Johns Creek GA, US
Joel Thomas Charlton - Roswell GA, US
Jimmy Lee Stewart - Woodstock GA, US

Assignee:

Exide Technologies - Milton GA

International Classification:

H01M 4/04

US Classification:

296231

Abstract:

A method of making battery plates for lead-acid batteries includes providing a strip of material comprising lead; and punching material out of the strip to form a grid comprising wires having a non-rectangular cross-sectional shape by utilizing a die set comprising a plurality of male die components and female die components, wherein each of the male die components comprises a first portion having a first cross-sectional shape and a second portion having a second-cross sectional shape. A single punch of the material creates a hole in the material and also forms the periphery of the hole.