Fuel Cell Stack Heating Control for Residual Water Freezing

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Solution Overview

Problem

Residual water in fuel cell stacks can freeze when outside temperatures drop below zero, affecting the durability of the stack.

Innovation Solution

A fuel cell vehicle with a controller that periodically activates during power-off to heat the fuel cell stack using a heater, based on cooling water and outside air temperatures, to prevent freezing, and discharges residual water when conditions are not met.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the fuel cell stack is heated using a heater during power-off state, then the residual water freezing is prevented, but the energy consumption increases and the start-up time is extended

Engineering Contradiction:

Improvedurability of fuel cell stackVSAvoidenergy consumption during power-off

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The controller performs preliminary heating of the fuel cell stack during the power-off state before the vehicle is started. By activating the heater in advance when the vehicle is turned off, the cooling water temperature is maintained above the freezing point, preventing residual water from freezing in the fuel cell stack. This preliminary action ensures the stack is ready for immediate operation upon startup, avoiding cold start issues and potential freezing damage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The controller implements periodic heating cycles during the power-off state rather than continuous heating. The heating operation is activated periodically based on temperature monitoring, where the controller checks the cooling water temperature and activates the heater only when necessary to maintain temperatures above freezing. This periodic approach reduces unnecessary energy consumption while still preventing freezing, balancing reliability with energy efficiency.

Inventive Principle:

Principle #19Periodic action

2Loss of time

If the controller activates the heater during power-off state, then the start-up time is shortened, but the battery power consumption increases

Engineering Contradiction:

Improvestart-up time of fuel cell vehicleVSAvoidbattery power consumption

Core Design Contradiction:

Loss of timeVSLoss of energy

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The controller implements a feedback control mechanism that continuously monitors the cooling water temperature and adjusts the heater operation accordingly. Temperature sensors provide real-time feedback to the controller, which activates or deactivates the heater based on whether the cooling water temperature remains above the freezing point. This feedback system ensures energy-efficient operation by activating the heater only when necessary, balancing start-up performance with battery power conservation.

Inventive Principle:

Principle #23Feedback

3Object-affected harmful factors

If residual water is discharged from the fuel cell stack, then the freezing risk is reduced, but the system complexity increases

Engineering Contradiction:

Improvefreezing risk of residual waterVSAvoidwater management system complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The system extracts and discharges residual water from the fuel cell stack through a dedicated water discharge mechanism. The controller monitors the state of residual water in the stack and activates the discharge function to remove water that could freeze and cause damage. This extraction approach directly eliminates the freezing risk by removing the problematic residual water from the system, particularly from areas where water accumulation could lead to freezing damage during cold conditions.

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

Prevents durability issues due to freezing, ensures a warm start by managing residual water, reducing noise and freezing, and improves operability by shortening start-up time.

Implementation Method 1

a heater configured to heat the cooling water using the power stored in the battery

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

a stack for generating electric energy by electrochemical reactions of fuel and an oxidizer to generate power

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Implementation Method 3

The anode hydrogen ions pass through an electrolyte membrane and move to the cathode (reduction electrode)

Methodology Applied

Scientific EffectIon transport through membrane: Semipermeable Membrane

Data Source

PatentUS20260005270A1Fuel Cell Vehicle

Publication Date: 2026.01.01 HYUNDAI MOTOR CO LTD

AI summary

A fuel cell vehicle is disclosed. The fuel cell vehicle includes a fuel cell stack, a battery configured to store power generated through a fuel cell stack, a heater configured to heat the cooling water using the power stored in the battery, and a controller periodically activated during power-off of a vehicle and deactivated after increasing the cooling water temperature through a heater until the cooling water temperature reaches a target temperature when heating conditions determined based on a cooling water temperature and an outside air temperature are satisfied in the activated state.