Preparation method for bipolar plate for redox flow battery

Patent metadata

Field	Value
Publication number	US-10629916-B2
Application number	US-201515506406-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Sep 1, 2014
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

Disclosed is a method of manufacturing a bipolar plate for a redox flow battery. The method includes (a) mixing epoxy, a curing agent, and a conductive filler to manufacture a mixture, and (b) manufacturing the bipolar plate including a conductive filler composite manufactured by compression-molding the mixture.

First claim

The invention claimed is:

1. A method of manufacturing a bipolar plate for a redox flow battery, comprising steps of:
(a) mixing an epoxy, a curing agent, and a conductive filler to manufacture a mixture; and
(b) manufacturing the bipolar plate including a conductive filler composite by compression-molding the mixture, wherein the mixture is charged in a mold and then heated and pressurized, thereby performing the compression-molding of the step (b),
wherein the step (b) comprises:
(b-1) compression-molding the mixture at a temperature of 50 to 70° C. under a pressure of 80 to 200 kgf/cm 2 ; and
(b-2) compression-molding a material resulting from the step (b-1) at a temperature of 100 to 160° C. under a pressure of 80 to 200 kgf/cm 2 , and
wherein the conductive filler is a needle-shaped graphite.

2. The method of claim 1 , wherein the epoxy has an EEW (epoxy equivalent weight) of 184 to 190 g/eq, a viscosity of 11,500 to 13,500 cps, and a specific gravity of 1.0 to 1.5.

3. The method of claim 1 , wherein the conductive filler has a particle resistivity of 100 to 150 mΩ·cm, an average particle diameter of 5 to 30 μm, and a specific surface area of 0.3 to 3.0 m 2 /g.

4. The method of claim 1 , wherein the mixture includes
100 parts by weight of the epoxy;
25 to 67 parts by weight of the curing agent; and
125 to 1,510 parts by weight of the conductive filler.

5. The method of claim 1 , wherein the mixture is charged in the mold while being interposed between two resin films and is then heated and pressurized, thereby performing the compression-molding of the step (b).

6. The method of claim 5 , further comprising:
passing the mixture through a sieve before the step (b).

7. The method of claim 1 , wherein the compression-molding of each of the steps (b-1) and (b-2) is performed for 30 min to 2 hours, respectively.

8. The method of claim 1 , wherein the bipolar plate has an area of 600 cm 2 or more.

9. The method of claim 8 , wherein the bipolar plate has an area of 600 to 3,500 cm 2 .

10. A method of manufacturing a redox flow battery, the method comprising:
a step of forming a bipolar plate according to the method of manufacturing a bipolar plate according to claim 1 .

Assignees

• Korea Inst Ind Tech

Inventors

• Kim Ho Sung
• Kim Min Young
• Kang Byeong Su
• Yang Sun Woo
• Noh Hee Sook

Classifications

• H01M8/0206

  Metals or alloys · CPC title

• B29C43/04

  using movable moulds · CPC title

• H01M8/0221

  Organic resins; Organic polymers · CPC title

• B29C43/14

  in several steps · CPC title

• H01M8/0215

  Glass; Ceramic materials · CPC title