Battery separators with controlled pore structure
AssigneeHollingsworth & Vose Company
InventorsRandall B. Keisler, Maxim Silin, John A. Wertz
Life of this patent
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Abstract
Disclosed are battery separators comprising glass fibers and having a basis weight (gsm), a specific surface area (m2/g), a density (gsm/mm) and a mean pore size (μm), which satisfy the equation disclosed herein. Also disclosed are batteries comprising the battery separators, and processes for making the separators.
Claims28
A battery separator comprising fibers, wherein the fibers comprise at least 5% glass fibers and wherein the fibers comprise fibers having an average fiber diameter of greater than or equal to 1 micron and less than or equal to 2 microns, and having a basis weight (in gsm), a specific surface area (in m2/g), a density (in gsm/mm) and a mean pore size (in μm), wherein the following equation is satisfied:
- mean
-
-
- pore
-
-
- size
- <
- (
- 270
- basis
-
-
- weight
- )
- 0.53
- *
- 1.6
- specific
-
-
- surface
-
-
- area
- *
- (
- 65
- density
- -
- 1.8
- )
- provided that:
- the density is greater than 175 gsm/mm,
- wherein:
- the battery separator has an acid filling time of less than or equal to 500 seconds;
- and
- the battery separator has a thickness greater than about 1 mm when loaded to a force of 20 kPa.
A battery separator comprising fibers, wherein:
- the fibers comprise at least 5% glass fibers and wherein the fibers comprise fibers having an average fiber diameter of greater than or equal to 1 micron and less than or equal to 2 microns, and having a basis weight (in gsm), a specific surface area (in m2/g), a density (in gsm/mm) and a mean pore size (in μm), wherein the following equation is satisfied:
- mean
-
-
- pore
-
-
- size
- <
- (
- 270
- basis
-
-
- weight
- )
- 0.53
- *
- 1.6
- specific
-
-
- surface
-
-
- area
- *
- (
- 65
- density
- -
- 1.8
- )
- provided that:
- the density is greater than 175 gsm/mm,
- wherein:
- the battery separator has a wet tensile strength of greater than or equal to 0.01 kN/m;
- and
- the battery separator has a thickness greater than about 1 mm when loaded to a force of 20 kPa.
Dependencies are inferred from the claim text.