EV Power Source Temperature Control During External Power Feed

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Solution Overview

Problem

In electrified vehicles, excessive power consumption during external power feed can lead to a reduced battery power storage amount, potentially preventing the vehicle from reaching its destination, and overheating may limit battery output.

Innovation Solution

A control system adjusts the temperature of the power source based on the power feed time and distance to a destination, setting appropriate temperature ranges to prevent overheating and ensure sufficient power for reaching the destination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If external power feed is executed to supply power to external load, then power supply capability is improved, but power storage amount of battery decreases

Engineering Contradiction:

Improvepower supply capabilityVSAvoidpower storage amount

Core Design Contradiction:

PowerVSQuantity of substance

Solution Approach 1:

The control device performs preliminary calculation of power storage amount before external power feed starts, and determines whether to allow external power feed based on predicted power levels. This prevents excessive power consumption that would leave insufficient power for reaching the destination.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device continuously monitors power storage amount during external power feed and compares it against calculated threshold values. When power storage falls below thresholds, the system provides feedback to limit or stop external power feed, ensuring sufficient power remains for destination travel.

Inventive Principle:

Principle #23Feedback

2Use of energy by moving object

If battery temperature is raised to suppress power consumption, then power availability is improved, but battery may be excessively heated and output limited

Engineering Contradiction:

Improvepower availabilityVSAvoidbattery temperature

Core Design Contradiction:

Use of energy by moving objectVSTemperature

Solution Approach 1:

The control device calculates appropriate battery temperature in advance based on external power feed duration and destination distance before external power feed starts. This preliminary temperature setting ensures sufficient power for destination travel while preventing excessive heating that would limit battery output.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device dynamically adjusts cooling device operation during external power feed based on real-time battery temperature monitoring. The cooling capacity is modulated to maintain temperature within optimal ranges, preventing both insufficient heating and excessive heating.

Inventive Principle:

Principle #15Dynamics

3Stability of the object's composition

If cooling device is controlled to maintain battery temperature, then temperature stability is improved, but power output may be limited if temperature is kept too low

Engineering Contradiction:

Improvetemperature stabilityVSAvoidpower output

Core Design Contradiction:

Stability of the object's compositionVSPower

Solution Approach 1:

The control device determines appropriate target temperature ranges before external power feed begins, considering both cooling stability and power output requirements. This preliminary temperature planning ensures the battery operates in optimal temperature zones for maximum power delivery.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device adjusts cooling device operating parameters dynamically during external power feed to maintain battery temperature within optimal ranges. By changing temperature parameters adaptively rather than maintaining fixed temperature, the system ensures sufficient power output while providing temperature stability.

Inventive Principle:

Principle #35Parameter changes

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

The system ensures the power source remains within safe temperature limits during external power feed, maintaining efficient power output and enabling the vehicle to reach its destination reliably.

Implementation Method 1

a cooling device for cooling the power source

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Data Source

PatentUS20250332931A1Electrified vehicle

Publication Date: 2025.10.30 TOYOTA JIDOSHA KK

AI summary

A electrified vehicle comprising: a motor for traveling; a fuel cell or a power storage device that supplies electric power to the motor; an external power feed device that is connected to the power source via the power line and supplies electric power of the power line to the external load; a cooling device that cools the power source; and a control device that controls at least the cooling device, wherein the control device controls the cooling device such that the temperature of the power source is adjusted based on a first related amount that is a power feed time that is a time required for external power feed or a power feed amount that is a power amount required for external power feed, and a second related amount that is a distance to a destination or power consumption toward a destination after external power feed.