Nonwoven Fabric Separator for Lead Storage Battery, and Lead Storage Battery Using Same

Patent metadata

Field	Value
Publication number	US-2019051878-A1
Application number	US-201716079580-A
Country	US
Kind code	A1
Filing date	Feb 21, 2017
Priority date	Feb 29, 2016
Publication date	Feb 14, 2019
Grant date	—

Abstract

A nonwoven fabric separator for a lead storage battery includes a nonwoven fabric configured with regenerated fibers or synthetic fibers.

First claim

1 . A nonwoven fabric separator for a lead storage battery, comprising a nonwoven fabric composed of a recycled fiber or synthetic fiber.

2 . The separator according to claim 1 , wherein the nonwoven fabric separator has an average pore diameter of from 0.1 μm to 50 μm.

3 . The separator according to claim 1 , wherein a relationship between the average pore diameter (D) of the nonwoven fabric separator and the number of pores (N) satisfies the following equation:
1.0×10 2 <D*N< 1.0×10 4

4 . The separator according to claim 1 , wherein the nonwoven fabric separator has a thickness of from 30 μm to 1000 μm and a weight per unit area of from 5 g/m 2 to 300 g/m 2 .

5 . The separator according to claim 1 , wherein the nonwoven fabric separator has a porosity of from 30% to 95%.

6 . The separator according to claim 1 , wherein the nonwoven fabric is composed of a long fiber.

7 . (canceled)

8 . The separator according to claim 1 , wherein the nonwoven fabric includes an ultrafine fiber having a fiber diameter of from 0.1 μm to 5 μm.

9 . The separator according to claim 8 , wherein the nonwoven fabric separator includes at least two layers including a nonwoven fabric layer (layer I) composed of the ultrafine fiber and a nonwoven fabric layer (layer II) composed of a fiber having a fiber diameter of from 5 μm to 30 μm.

10 . The separator according to claim 9 , wherein the nonwoven fabric separator includes three layers in which the layer I is arranged as an intermediate layer between the layer II and the layer II.

11 . The separator according to claim 1 , wherein the nonwoven fabric separator is composed of the synthetic fiber.

12 . The separator according to claim 1 , wherein the nonwoven fabric separator is composed of a polyester fiber.

13 . The separator according to claim 1 , wherein the nonwoven fabric separator is composed of a polyolefin fiber.

14 . (canceled)

15 . The separator according claim 1 , wherein the nonwoven fabric separator has a gas permeability of from 0.01 seconds/100 cc to 10 seconds/100 cc.

16 . The separator according to claim 1 , wherein the nonwoven fabric separator has a tensile strength of from 15 N/15 mm to 300 N/15 mm.

17 . The separator according to claim 1 , wherein the nonwoven fabric separator has a specific surface area of from 0.1 m 2 /g to 50 m 2 /g.

18 . The separator according to claim 1 , wherein the nonwoven fabric separator is a hydrophilized nonwoven fabric.

19 . The separator according to claim 1 , wherein the nonwoven fabric separator is a nonwoven fabric integrated by thermal bonding.

20 . (canceled)

21 . The separator according to claim 1 , wherein the nonwoven fabric separator includes a nonwoven fabric substrate having a void space structure and inorganic particles present on a surface portion of the nonwoven fabric substrate or on a fiber surface inside the nonwoven fabric substrate.

22 . The separator according to claim 21 , wherein the inorganic particles include a silicon component.

23 . The separator according to claim 21 , wherein the inorganic particles have an average particle diameter of from 1 nm to 5000 nm.

24 . The separator according to claim 21 , wherein the inorganic particles have a specific surface area of from 0.1 m 2 /g to 1000 m 2 /g.

25 . The separator according to claim 21 , wherein the nonwoven fabric separator includes a binder present inside the nonwoven fabric substrate in an amount of from 1 to 500 parts by weight with respect to 100 parts by weight of the inorganic particles.

26 . The separator according to claim 1 , wherein the nonwoven fabric separator is heat-sealable.

27 - 31 . (canceled)

32 . The separator according to claim 3 , wherein the nonwoven fabric is composed of a long fiber.

Assignees

• Asahi Chemical Ind

Inventors

• Kusakabe Junichi
• Amano Seiichi
• Kato Kazufumi

Classifications

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/494

  Tensile strength · CPC title

• H01M50/434

  Ceramics · CPC title

• H01M50/491

  Porosity · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title