TERMINATION ASSEMBLY OF A CELL STACK OF A REDOX FLOW BATTERY

• Main Authors: TRAMPERT, Markus, HARRER, Martin, POKORNY, Peter, WHITEHEAD, Adam Harding
• Format: Patent
• Language: English; French; German
• Published: 18.09.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The aim of the invention is to specify a termination assembly of a cell stack (2) of a redox flow battery (1), which termination assembly enables sufficiently high efficiency of the redox flow battery (1) and does not contaminate an electrolyte liquid when in contact with said electrolyte liquid. This aim is achieved in that the termination assembly is designed having a current collector (3) and an electrode end plate (70), wherein in a contact region (5) the electrode end plate (70) and the current collector (3) lie against each other and are in electrical contact, wherein in at least 20 % of the contact region (5) the current collector (3) is coated with an electrically conductive current collector coating (30), the electrode end plate (70) is coated with an electrically conductive electrode coating (71) in said at least 20 % of the contact region (5), the combination of the current collector (3), the current collector coating (30) and the electrode coating (71) consists of at most 5 wt% of Cu and Ag in total and at most 0.05 % of elements of the platinum group in total and the electrical resistance of the combination of the current collector (3), the current collector coating (30) and the electrode coating (71) does not exceed 1 ohm · cm2 over a time period of at least 2000 hours.