SOFC Charging Point Control for Heating Loss Reduction

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Solution Overview

Problem

Existing charging infrastructure for fuel cell vehicles is inefficient due to high energy loss from frequent heating of solid oxide fuel cells and inadequate utilization of existing power grids, leading to increased investment and operational costs.

Innovation Solution

A system of interconnected charging points with solid oxide fuel cells and high-voltage batteries, where energy is managed to minimize heating losses by using 'warm' cells and balancing battery states across multiple points, optimizing thermal efficiency and reducing startup losses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If solid oxide fuel cells are operated individually at each charging point, then each charging point can provide charging services independently, but energy loss increases due to frequent heating and cooling cycles

Engineering Contradiction:

Improveindependent charging service capabilityVSAvoidheating and cooling energy loss

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

Multiple charging points with solid oxide fuel cells are merged into a networked system where cells can share thermal states. The control unit enables charging points to draw power from other charging points whose fuel cells are already warm, eliminating redundant heating cycles and reducing energy loss while maintaining independent service capability.

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If solid oxide fuel cells are heated frequently to meet charging demand, then charging availability is improved, but energy efficiency deteriorates due to high heating energy consumption

Engineering Contradiction:

Improvecharging availabilityVSAvoidheating energy consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The system performs preliminary heating of solid oxide fuel cells in advance during periods of low demand, so that when charging demand arises, the cells are already warm and can immediately provide power without energy-intensive reheating. The control unit manages this by balancing thermal states across the network.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The networked system maintains continuous useful action by keeping multiple fuel cells in different thermal states, ensuring that at least one cell is always ready to provide charging current. This eliminates idle heating and cooling cycles while maintaining high charging availability.

Inventive Principle:

Principle #20Continuity of useful action

3Loss of energy

If multiple charging points are interconnected to share energy, then energy efficiency is improved by reducing heating losses, but system complexity increases due to additional control requirements

Engineering Contradiction:

Improveheating lossVSAvoidsystem control complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The control unit implements feedback mechanisms that continuously monitor the thermal state and charging status of each fuel cell in the network. Based on this feedback, the system automatically optimizes power distribution and heating schedules, simplifying the control complexity through intelligent automation while maximizing energy efficiency.

Inventive Principle:

Principle #23Feedback

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

Enhances the efficiency of solid oxide fuel cells by minimizing heating losses and optimizing energy use, extending cell lifespan and reducing overall system costs.

Implementation Method 1

Fuel cells serve for providing electric energy in a chemical reaction between a hydrogen-containing fuel and an oxygen-containing oxidizing agent, generally air

Methodology Applied

Scientific EffectFuel cell electrochemical reaction: Fuel Cell

Implementation Method 2

This solid oxide fuel cell produces a large amount of waste heat

Methodology Applied

Scientific EffectExothermic reaction: Exothermic Reaction

Data Source

PatentUS12558988B2Method for control of a system of charging points composed of at least two charging points and a charging point for use in a system of charging points

Publication Date: 2026.02.24 VOLKSWAGEN AG

AI summary

A method is provided for control of a system of charging points composed of at least two charging points, each of which is outfitted with at least one solid oxide fuel cell and with a high-voltage battery electrically connected or electrically connectible to the solid oxide fuel cell, where the charging points are adapted to provide electrical charging current via a converter at an interface for connection to a battery operated consumer. The method includes: checking the state of charge of the high-voltage battery of a first charging point by which the electric energy will be provided for charging the consumer via the interface, charging the high-voltage battery of the first charging point, and possibly that of the consumer, by a current-generating operation of the solid oxide fuel cell of the first charging point, if the state of charge of the high-voltage battery of the first charging point has fallen below a first limit value, and charging the high-voltage battery of the first charging point by means of an electric current provided by a second charging point if the state of charge of the high-voltage battery has fallen below a second limit value, located below the first limit value.