EV Battery Temperature Control Using Internal Power for External Feed

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Solution Overview

Problem

Electrically powered vehicles face inefficiencies in temperature control of batteries, particularly when requested to perform external power feed at low temperatures, as existing systems rely on external electric power for heating, which is not energy-efficient and can lead to insufficient battery output performance.

Innovation Solution

The implementation of a controller that uses either external electric power or battery power to heat the battery, prioritizing battery power for temperature increase before external power feed to ensure sufficient output performance, thereby managing energy resources effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external electric power is used to heat the battery before external power feed, then the battery temperature increases to improve output performance, but energy resource consumption increases

Engineering Contradiction:

Improvebattery output performanceVSAvoidenergy resource consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The controller performs temperature increase control of the battery before external power feed is requested, ensuring the battery reaches optimal temperature in advance. This preliminary heating action allows the battery to maintain sufficient output performance during power feed without requiring continuous external power supply for heating.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses stored battery power to heat the battery itself when needed, rather than always relying on external electric power. This self-service approach allows the battery to utilize its own energy resources for temperature maintenance, reducing dependence on external power supply and improving energy management efficiency.

Inventive Principle:

Principle #25Self-service

2Temperature

If the battery is heated using external electric power during DR suppression, then the battery temperature increases, but energy management efficiency decreases due to insufficient energy resources

Engineering Contradiction:

Improvebattery temperatureVSAvoidenergy management efficiency

Core Design Contradiction:

TemperatureVSProductivity

Solution Approach 1:

The controller dynamically switches between external electric power and battery power for heating based on real-time conditions such as DR signal type, battery temperature, and available energy resources. This dynamic power source selection optimizes energy management efficiency while ensuring the battery reaches and maintains the required temperature for external power feed operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the power source parameter from fixed external power supply to variable selection between external and battery power. This parameter change allows flexible adaptation to different energy resource conditions, improving energy management efficiency while achieving the required battery temperature increase.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If the battery temperature is not increased before external power feed, then energy resources are conserved, but battery output performance becomes insufficient

Engineering Contradiction:

Improveenergy resource consumptionVSAvoidbattery output performance

Core Design Contradiction:

Use of energy by moving objectVSPower

Solution Approach 1:

The controller continuously monitors battery temperature and compares it with the required temperature threshold. Based on this feedback, the controller determines whether temperature increase control is needed and selects the appropriate power source. This feedback mechanism ensures battery output performance is maintained while avoiding unnecessary energy consumption for heating when temperature requirements are already met.

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

This approach enhances battery output performance during external power feed, reduces energy resource consumption, and allows for more efficient participation in power leveling by maintaining optimal battery temperatures.

Implementation Method 1

perform temperature increase control by using battery power before the external power feed requested by the leveling signal

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS11400832B2Electrically powered vehicle

Publication Date: 2022.08.02 TOYOTA JIDOSHA KK

AI summary

An electrically powered vehicle includes a target battery that is externally chargeable and externally power feedable, a sensor that detects a temperature of the target battery, and a controller that performs charging control, discharging control, and temperature increase control of the target battery. The temperature increase control is control for increasing a temperature of the target battery by selecting any of external electric power and battery power and generating heat with the selected electric power. The controller receives a leveling signal that requests for power leveling. When the temperature of the target battery is lower than a first temperature during external power feed requested by the leveling signal, the controller performs the temperature increase control by using battery power before the external power feed requested by the leveling signal.