Donald E Simmons

US Patent:

6692867, Feb 17, 2004

Filed:

Oct 12, 2001

Appl. No.:

09/976982

Inventors:

Robert A. Nark - Charlotte NC
Ronald W. Call - Rock Hill SC
Donald K. Simmons - Charlotte NC
Mark W. Ferebee - Charlotte NC

Assignee:

Celgard Inc. - Charlotte NC

International Classification:

H01M 216

US Classification:

429142, 429144, 429254

Abstract:

A method for removing a pin from a battery assembly by the step of providing a separator comprising: a microporous membrane having an exterior surface portion of polypropylene, the polypropylene including at least 50 ppm of metallic stearate, preferably calcium stearate Static and being adapted to exhibit a pin removal force 7100 g.

US Patent:

6921608, Jul 26, 2005

Filed:

Aug 21, 2002

Appl. No.:

10/225018

Inventors:

Ronald W. Call - Rock Hill SC, US
J. Robert Dees - Charlotte NC, US
Shizuo Ogura - Charlotte NC, US
Donald K. Simmons - Charlotte NC, US
Xiangyun Wei - Charlotte NC, US

Assignee:

Celgard, Inc. - Charlotte NC

International Classification:

H01M008/00

US Classification:

429129, 429145, 296231

Abstract:

The present invention is directed to a battery separator. The battery separator comprises a microporous film having a first portion and a second portion. The first portion is bonded to the second portion. The bond has a strength greater than 5 g/in. The film has a thickness less than 1. 7 mils, a Gurley of less than 50 sec/10 cc, and a puncture strength of greater than 400 g/mil.

US Patent:

7790320, Sep 7, 2010

Filed:

Jan 2, 2007

Appl. No.:

11/619002

Inventors:

Pankaj Arora - Charlotte NC, US
Ronald W. Call - Rock Hill SC, US
Tien Dao - Charlotte NC, US
Khuy V. Nguyen - Charlotte NC, US
Donald K. Simmons - Charlotte NC, US
Zhengming Zhang - Charlotte NC, US

Assignee:

Celgard LLC - Charlotte NC

International Classification:

H01M 2/16
H01M 2/14

US Classification:

429247, 429129, 429248, 429249, 429251

Abstract:

A battery separator is a microporous membrane. The membrane has a major volume of a thermoplastic polymer and a minor volume of an inert particulate filler. The filler is dispersed throughout the polymer. The membrane exhibits a maximum Z-direction compression of 95% of the original membrane thickness. Alternatively, the battery separator is a microporous membrane having a TMA compression curve with a first substantially horizontal slope between ambient temperature and 125 C. , a second substantially horizontal slope at greater than 225 C. The curve of the first slope has a lower % compression than the curve of the second slope. The curve of the second slope is not less than 5% compression. The TMA compression curve is graphed so that the Y-axis represents % compression from original thickness and the X-axis represents temperature.

US Patent:

20020136945, Sep 26, 2002

Filed:

Mar 27, 2002

Appl. No.:

10/107781

Inventors:

Ronald Call - Rock Hill SC, US
Donald Simmons - Charlotte NC, US
Ta-Hua Yu - Nanuet NY, US

International Classification:

H01M002/16
H01M002/18
B32B027/08

US Classification:

429/144000, 429/145000, 428/516000

Abstract:

A microporous battery separator is provided having a first co-extruded multilayered portion and a second co-extruded multilayered portion. The two portions are bonded together. In a preferred embodiment, the battery separator has two substantially identical multilayered portions bonded together face-to-face. Each of the two multilayered portions has at least one strength layer and at least one shutdown layer. Methods for making the battery separators are also provided. Preferably, a tubular multilayered film is extruded, and collapsed onto itself to form a multilayered battery separator precursor. The precursor is then bonded and annealed before it is stretched to form a microporous multilayer battery separator.

US Patent:

20030104236, Jun 5, 2003

Filed:

Dec 3, 2001

Appl. No.:

10/005846

Inventors:

Khuy Nguyen - Charlotte NC, US
Donald Simmons - Charlotte NC, US
Ronald Call - Rock Hill SC, US
Shawn Hux - Gastonia NC, US

Assignee:

Celgard Inc.

International Classification:

B32B003/26

US Classification:

428/523000, 428/304400, 428/515000

Abstract:

A diffusion membrane is a microporous sheet comprising a blend of an aliphatic polyolefin and a thermoplastic olefin (TPO) elastomer. The blend comprises less than 10 percent by weight of the elastomer. The preferred polyolefins are selected from a group consisting of polyethylene, polypropylene, copolymers thereof, and blends thereof. The preferred TPO elastomers are selected from the group consisting of ethylene-propylene rubbers (EPR), ethylene-propylene-diene terpolymer rubbers (EPDM), and combinations thereof.

US Patent:

20040086782, May 6, 2004

Filed:

Nov 1, 2002

Appl. No.:

10/286544

Inventors:

Zhengming Zhang - Charlotte NC, US
Donald Simmons - Charlotte NC, US
Kevin Chambers - Fort Mill SC, US
Pankaj Arora - Charlotte NC, US

Assignee:

Celgard Inc.

International Classification:

H01M002/16

US Classification:

429/142000, 429/061000, 429/248000, 429/249000

Abstract:

A battery separator for a lithium-ion secondary battery is a microporous membrane with an adjuvant. The microporous membrane is made of a thermoplastic. The adjuvant, in an effective amount, is mixed into the separator or coated thereon. The adjuvant is a material adapted to reduce or eliminate energy concentrations around the separator. The energy concentration is sufficient to initiate a reaction of the components of the lithium ion secondary battery.

US Patent:

20050031941, Feb 10, 2005

Filed:

Jul 22, 2003

Appl. No.:

10/624277

Inventors:

Zhengming Zhang - Charlotte NC, US
Donald Simmons - Charlotte NC, US
Kevin Chambers - Fort Mill SC, US
Pankaj Arora - Charlotte NC, US

International Classification:

H01M002/16

US Classification:

429142000, 429061000, 429248000

Abstract:

A battery separator for a lithium-ion secondary battery is a microporbus membrane with an adjuvant. The microporous membrane is made of a thermoplastic, and has a thickness of 25 μm or less. The adjuvant, in an effective amount, is mixed into the membrane or coated thereon. The adjuvant is a material adapted to reduce or eliminate energy concentrations around the separator. The energy concentration is sufficient to initiate a reaction of the components of the lithium ion secondary battery.

US Patent:

20050202163, Sep 15, 2005

Filed:

Mar 9, 2004

Appl. No.:

10/796473

Inventors:

Khuy Nguyen - Charlotte NC, US
Donald Simmons - Charlotte NC, US
Kevin Chambers - Fort Mill SC, US
Joe Montagnino - Charlotte NC, US
Richard Ford - Charlotte NC, US

International Classification:

B05D003/12

US Classification:

427171000, 427402000

Abstract:

A method of making a composite microporous membrane includes the steps of: coating a nonporous precursor film with a polymer composition, and then stretching the coated nonporous precursor. Stretching includes a first stretching conducted at a first temperature and a first stretching rate and a second stretching conducted at a second temperature and a second stretching rate. The first stretching rate and the second stretching rate are different.