SEPARATOR FOR LEAD ACID STORAGE BATTERY

• US 20200136117A1
• Filed: 04/27/2018
• Published: 04/30/2020
• Est. Priority Date: 04/28/2017
• Status: Active Grant

• Current Assignee: Entek Asia Incorporated
• Original Assignee: Nippon Sheet Glass Company Limited
• Inventors: ONISHI, Masaki, SHIDOMI, Takashi, KAWACHI, Masahiro
• Granted Patent: US 11,158,908 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/06 Lead-acid accumulators semi-lead accumulators H01M10/20
• CPC Class Codes: H01M 10/12 Construction or manufacture
• CPC Class Codes: H01M 50/406 Moulding; Embossing; Cutting
• CPC Class Codes: H01M 50/463 Separators, membranes or diaphragms characterised by their shape
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

[Problem]

A separator for a lead acid storage battery that is prevented from suffering the puncture of a separator formed of a microporous film is to be provided.

[Solution]

The separator includes: a microporous film having a thickness of from 0.1 to 0.3 mm as a base portion 3; plural main ribs 2a that are provided on one surface 3a of the base portion 3; and plural miniature ribs 2b that have a lower height than a height of the main ribs 2a and are provided on the other surface 3b of the base portion 3, and the plural miniature ribs 2b are provided in a linear form with an inter-rib distance P, which is a distance between facing surfaces of the adjacent miniature ribs 2b, of less than 1.9 mm.

Claims

1. :

A separator for a lead acid storage battery, comprising;

a microporous film having a thickness of from 0.1 to 0.3 mm as a base portion;

plural main ribs that are provided on one surface of the base portion; and

plural miniature ribs that have a lower height than a height of the main ribs and are provided on the other surface of the base portion,

the plural miniature ribs being provided in a linear form with an inter-rib distance, which is a distance between facing surfaces of the adjacent miniature ribs, of less than 1.9 mm.

2. :

The separator for a lead acid storage battery according to claim 1, wherein in a case where a contact width of a tip surface having a diameter of 1.9 mm of a needle to the miniature rib in a cross section perpendicular to the linear direction of the miniature rib is changed while repeatedly increasing and decreasing at a constant cycle by perpendicularly piercing the other surface with the tip surface of the needle and moving the needle along a direction of the inter-rib distance, a probability of contacting the tip surface of the needle with the miniature rib is 10% or more and 30% or less, and

the probability is determined from a ratio of a width of the miniature rib that is brought into contact with the needle to a width of the tip surface of the needle while the needle moves for one cycle of the cycle.

4. :

The separator for a lead acid storage battery according to claim 1, wherein the miniature ribs have a miniature rib height of from 0.05 to 0.20 mm.

5. :

The separator for a lead acid storage battery according to claim 1, wherein the base portion has a thickness of from 0.15 to 0.25 mm.

6. :

The separator for a lead acid storage battery according to claim 1, wherein the miniature ribs are provided in a linear form in a direction in parallel to a flow direction of a sheet in compression molding in production of the microporous film.

3. (canceled)