Fuel Cell Stack Multi-Point Voltage Distribution

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Solution Overview

Problem

Fuel cell systems require direct current (DC) converters to adjust voltage for device compatibility, which increases cost, inefficiency, mass, and volume, and introduces additional points of failure.

Innovation Solution

A fuel cell stack with multiple connection points allows for simultaneous delivery of different DC voltages to devices without the need for DC converters, by strategically placing connection points to harness combined fuel cell voltages and using switches for power management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If DC converters are used to adjust voltage for device compatibility, then voltage adaptability is improved, but system cost, mass, volume, and complexity increase

Engineering Contradiction:

Improvevoltage adaptabilityVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The fuel cell stack is divided into multiple segments with individual connection points between fuel cell groups. Each connection point can independently provide voltage to different devices, eliminating the need for centralized DC converters. This segmentation allows direct voltage delivery at multiple levels within the stack structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a single-end voltage output model to a multi-point voltage distribution model along the length of the fuel cell stack. By placing connection points at different positions along the stack, multiple voltage levels are achieved through spatial distribution rather than through voltage conversion operations.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If DC converters are used to adjust voltage, then voltage adaptability is improved, but mass and volume increase

Engineering Contradiction:

Improvevoltage adaptabilityVSAvoidsystem mass

Core Design Contradiction:

Adaptability or versatilityVSWeight of stationary object

Solution Approach 1:

The DC converter components are completely extracted and removed from the system. Instead of using external converters, the fuel cell stack itself is designed to directly provide multiple voltage levels through strategically placed connection points, eliminating the need for separate voltage conversion hardware and its associated mass.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If DC converters are used to adjust voltage, then voltage adaptability is improved, but efficiency decreases

Engineering Contradiction:

Improvevoltage adaptabilityVSAvoidconversion efficiency

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The system maintains continuous direct electrical connection from the fuel cells to the devices without interruption through conversion processes. Multiple connection points enable direct voltage delivery at different levels, eliminating the energy losses associated with DC-DC conversion while maintaining continuous power supply to all devices.

Inventive Principle:

Principle #20Continuity of useful action

4Adaptability or versatility

If DC converters are used to adjust voltage, then voltage adaptability is improved, but reliability decreases due to additional points of failure

Engineering Contradiction:

Improvevoltage adaptabilityVSAvoidsystem reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The DC converters are extracted from the system, removing their associated failure modes. The simplified architecture with direct connection points reduces the number of active electronic components that could fail, thereby improving overall system reliability while maintaining voltage adaptability through structural design.

Inventive Principle:

Principle #2Taking out (Extraction)

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 configuration simplifies the system, reduces mass and volume, enhances efficiency, and eliminates the need for costly converters, thereby improving reliability and reducing complexity.

Implementation Method 1

a fuel cell includes an anode and a cathode separated by an electrolyte. Charges move between the anode and the cathode producing direct current (DC) electricity. Specifically, a chemical reaction strips hydrogen atoms of their electrons, resulting in the hydrogen atoms being 'ionized.'

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Data Source

PatentUS10320015B1Fuel Cell Power Management

Publication Date: 2019.06.11 UNITED STATES GOVERNMENT ADMINISTRATOR OF NASA

AI summary

Systems, methods, and other embodiments associated with fuel cell power management. According to one embodiment, a fuel cell stack includes a plurality of fuel cells producing electric potentials. An electric potential of a fuel cell is measured as a fuel cell voltage. The fuel cell stack further includes a plurality of connection points including a ground, a first connection point, and a second connection point. The first connection point draws a first voltage based on combined fuel cell voltages of a first set of fuel cells of the plurality of fuel cells. The second connection point draws a second voltage based on the combined fuel cell voltages of a second set of fuel cells of the plurality of fuel cells.