PEM Fuel Cell Stack Assembly Using Bipolar End Plates

Solution Overview

Problem

The existing fuel cell assembly process requires six different parts and manufacturing circuits, leading to high production costs.

Innovation Solution

The proposal is to reduce the number of different parts by reusing a bipolar plate at both ends of the stack and producing both the anode and cathode end plates from the same bipolar plate, with the addition of obturating means to manage reagent distribution ducts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If six different parts (terminal, end anode plate, membrane plate, bipolar plate, end cathode plate) are used for fuel cell assembly, then the assembly can be completed with traditional manufacturing processes, but the production cost increases and the number of manufacturing circuits increases

Engineering Contradiction:

Improveproduction costVSAvoidnumber of different parts

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The bipolar plate is designed to serve dual functions: as a structural separator between cells and as an end plate (either anode end plate or cathode end plate) at the terminals of the stack. This multi-functionality reduces the total number of different parts from six to four, eliminating the need for separate end plate components and reducing manufacturing complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the functions of the bipolar plate and the end plate into a single component. By making the bipolar plate act as both the cell separator and the terminal end plate, two previously separate parts are combined into one, thereby reducing the number of manufacturing circuits and assembly steps

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If six different parts are used for fuel cell assembly, then each part can be optimized for its specific function, but the number of manufacturing circuits increases leading to higher production costs

Engineering Contradiction:

Improveproduction costVSAvoidnumber of manufacturing circuits

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The bipolar plate is designed to serve dual functions: as a structural separator between cells and as an end plate (either anode end plate or cathode end plate) at the terminals of the stack. This multi-functionality reduces the total number of different parts from six to four, eliminating the need for separate end plate components and reducing manufacturing complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention merges the functions of the bipolar plate and the end plate into a single component. By making the bipolar plate act as both the cell separator and the terminal end plate, two previously separate parts are combined into one, thereby reducing the number of manufacturing circuits and assembly steps

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach reduces the number of parts required to two main types (membrane plates and bipolar plates), thereby lowering production costs and simplifying the assembly process.

Implementation Method 1

The two H+ protons migrate through the membrane electrode assembly to a cathode

Methodology Applied

Scientific EffectProton migration through membrane: Permeation

Implementation Method 2

a membrane electrode assembly, comprising an electrolyte surrounded by two layers of catalyst

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 3

It decomposes, by an oxidation: 2 H2→4 H++4 e−

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 4

there, they allow a reduction of oxygen O2 into two oxygen ions O2—

Methodology Applied

Scientific EffectReduction: Reduction

Implementation Method 5

The hydrogen protons and the oxygen ions combine, at the cathode, to form water: 4 H++2 O2—→2 H2O. This reaction is strongly exothermic.

Methodology Applied

Scientific EffectExothermic reaction: Exothermic Reaction

Data Source

PatentUS12334565B2Proton-exchange-membrane fuel cell

Publication Date: 2025.06.17 SYMBIO

AI summary

A fuel cell, of proton-exchange-membrane type, includes, stacked in the following order: a first terminal, an end anode plate, a plurality of membrane plates having a bipolar plate between every two membrane plates, an end cathode plate and a second terminal Each bipolar plate includes, preassembled in the following order: a medial cathode plate and a medial anode plate, each medial anode, end anode, medial cathode and end cathode plate comprising at least one duct for distributing a reactant. The anode end plate is produced by a bipolar plate of the same orientation, and an anode capable of obturating all of the ducts of the medial cathode plate of this bipolar plate. The cathode end plate is produced by a bipolar plate of the same orientation, and a cathode capable of obturating all of the ducts of the medial anode plate of this bipolar plate.