Battery Temperature Control System for Electric Vehicles

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Solution Overview

Problem

Conventional battery temperature control systems for electric vehicles unconditionally increase battery temperature, leading to unnecessary energy consumption and potential safety risks, especially when charging at low temperatures, as they do not determine the need for temperature adjustment based on current conditions.

Innovation Solution

A battery temperature control system that uses a memory to store maximum charging current and allowable current maps, allowing the temperature controller to decide whether to increase the battery temperature based on the current temperature and charger duty, thereby optimizing energy use and preventing unnecessary discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the battery temperature is unconditionally increased to a preset target temperature when charging at low temperature, then the charging efficiency is improved, but unnecessary energy consumption occurs and safety risks increase

Engineering Contradiction:

Improvecharging efficiencyVSAvoidunnecessary energy consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent changes the temperature parameter dynamically based on battery state and charging conditions. Instead of using a fixed target temperature, the system adjusts the temperature control parameters (target temperature, heating power) according to real-time battery temperature, state of charge, and charging current, thereby avoiding unnecessary energy consumption while maintaining charging efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback control mechanism where the temperature controller continuously monitors battery temperature, state of charge, and charging current, then adjusts the heating control accordingly. This closed-loop feedback system ensures temperature increase only when actually needed for charging efficiency, preventing unnecessary energy consumption

Inventive Principle:

Principle #23Feedback

2Productivity

If the battery temperature is unconditionally increased to a preset target temperature when charging at low temperature, then the charging efficiency is improved, but safety risks such as fire and explosion increase

Engineering Contradiction:

Improvecharging efficiencyVSAvoidsafety risks

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent dynamically adjusts temperature parameters based on real-time battery conditions including state of charge and temperature. By changing target temperature and heating power according to battery state, the system avoids excessive temperature increase that could lead to safety risks while maintaining adequate charging efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent transitions from static temperature control to dynamic temperature control. The temperature control strategy adapts in real-time based on battery temperature, state of charge, and charging current, making the system responsive to changing conditions and preventing unsafe temperature scenarios

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If the battery temperature is increased when not necessary, then charging at low temperature is facilitated, but the battery discharges energy unnecessarily

Engineering Contradiction:

Improvecharging capability at low temperatureVSAvoidbattery energy discharge

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The patent changes the temperature control parameters based on actual charging needs. By adjusting target temperature and heating activation thresholds according to battery state of charge and charging current, the system ensures temperature increase only when it actually improves charging capability, avoiding unnecessary battery energy discharge

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies partial heating action only when necessary rather than unconditional full heating. The temperature controller selectively activates heating based on whether the battery temperature actually limits charging current, applying just enough heat to enable efficient charging without excessive energy consumption

Inventive Principle:

Principle #16Partial or excessive action

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 that the battery temperature is only raised when necessary, improving charging efficiency and safety by preventing unnecessary energy consumption and potential safety hazards.

Implementation Method 1

when a heater rapidly applies heat in order to increase the temperature of the lithium polymer battery

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS10913361B2Battery temperature control system and method

Publication Date: 2021.02.09 HYUNDAI MOTOR CO LTD

AI summary

A battery temperature control system includes: a memory storing a maximum charging current map according to temperature of a battery for an electric vehicle, and an allowable current map according to a control pilot (CP) duty; and a temperature controller comparing a maximum charging current corresponding to a current temperature of the battery with an allowable current corresponding to a current CP duty to determine whether to increase the temperature of the battery.