IP Library › Granted Patent US 6,869,726
Granted Patent B2
US 6,869,726 · App. 10/075,167 · Granted Mar 22, 2005

Reinforced multilayer separator for lead-acid batteries

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Quick Facts
Patent No.
US 6,869,726
App. No.
10/075,167
Granted
Mar 22, 2005
Kind
B2
Abstract

A battery separator comprising at least one fibrous layer and at least one support layer, wherein the support layer is formed of an acid-resistant material and comprises a plurality of macroscopic openings.

Claims (18)

1. A battery separator comprising at least one fibrous layer comprising a mixture of glass fibers and polymeric fibers and at least one support layer, wherein said support layer is formed of an acid-resistant material and comprises a plurality of macroscopic openings having diameters larger than 1 mm and penetrating the whole thickness of said support layer providing direct ionic transfer through said support layer via straight paths extending substantially perpendicular to the extended plane of said support layer.

2. A battery separator according to claim 1 , wherein the fibrous layer has an average pore size of 3 to 15 μm.

3. A battery separator according to claim 1 , wherein the fibrous layers comprise glass fibers having a diameter of 0.1 to 10 μm.

4. A battery separator according to claim 3 , wherein the glass fibers have diameters ranging from 0.1 to 5 μm.

5. A battery separator according to claim 1 , wherein the fibrous layers comprise polymeric fibers having a diameter of 0.1 to 10 μm.

6. A battery separator according to claim 5 , wherein the polymeric fibers have diameters ranging from 0.1 to 5 μm.

7. A battery separator according to claim 1 , wherein the polymeric fibers are polyolefin fibers.

8. A battery separator according to claim 7 , wherein the polyolefin is polyethylene and/or polypropylene.

9. A battery separator according to claim 1 , wherein the fibrous layer has a thickness of 0.2 mm to 3.6 mm.

10. A battery separator according to claim 1 , wherein the openings of the support layer cover more than 60% of the surface of the support layer.

11. A battery separator according to claim 10 , wherein the openings of the support layer cover more than 70% of the surface of the support layer.

12. A battery separator according to claim 11 , wherein the openings of the support layer cover more than 80% of the surface of the support layer.

13. A battery separator according to claim 12 , wherein the openings of the support layer cover more than 90% of the surface of the support layer.

14. A battery separator according to claim 1 , wherein the openings are spaced apart 0.01 to 5 mm.

15. A battery separator according to claim 1 , wherein at least two opposing edge regions of the support layer are not covered by the fibrous layer to provide edges for sealing.

16. A battery separator according to claim 1 , wherein the openings of the support layer have the form of slots or long holes.

17. A battery separator according to claim 1 , wherein the support layer has a thickness of 0.01 to 1 mm.

18. A battery separator according to claim 1 , wherein the separator has the form of a pocket with an open top, a closed bottom and closed sides.

Assignments (3)
TERMINATION AND RELEASE OF SECURITY INTEREST IN UNITED STATES PATENTS Recorded Aug 28, 2015
From: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
To: DARAMIC, LLC (F/K/A/ DARAMIC, INC.)
Reel/Frame 036502/0654 →
RELESE OF SECURITY AGREEMENTS IN PATENT RIGHTS Recorded Jul 22, 2014
From: JPMORGAN CHASE BANK, N.A., AS ADMINISTRATIVE AGENT
To: DARAMIC, LLC
Reel/Frame 033380/0504 →
PATENT SECURITY AGREEMENT Recorded Apr 8, 2014
From: DARAMIC, LLC (F/K/A DARAMIC, INC.)
To: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 032631/0795 →