Battery Control Device for Low-Temperature Performance Recovery

Solution Overview

Problem

Secondary batteries, particularly lithium ion batteries, experience performance deterioration when used in low temperatures, making it difficult to recover their performance without replacement.

Innovation Solution

A control device and method that monitor the temperature of a power storage portion and adjust the discharge rate of a battery package, allowing for controlled discharging and recharging to prevent deterioration and recover performance in lithium ion secondary batteries even at low temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If secondary batteries are used in low temperatures, then the batteries can operate in cold environments, but the performance of the batteries deteriorates

Engineering Contradiction:

Improvetemperature rangeVSAvoidbattery performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The control device performs preliminary warming of the battery before discharge operations in cold environments. The control unit activates the warming function to raise the battery temperature to a predetermined threshold before allowing normal discharge, preventing performance deterioration caused by low temperature conditions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device dynamically adjusts the discharge rate based on real-time temperature monitoring. When the battery temperature is below the threshold, the control unit limits the discharge rate to a lower value; when temperature reaches the threshold, normal discharge rates are permitted, creating a dynamic adaptation to temperature conditions

Inventive Principle:

Principle #15Dynamics

2Reliability

If the battery is warmed before use in low temperatures, then performance deterioration is prevented, but the battery cannot recover performance after deterioration occurs

Engineering Contradiction:

Improveperformance preventionVSAvoidperformance recovery

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The control device performs preliminary warming of the battery before discharge operations in cold environments. The control unit activates the warming function to raise the battery temperature to a predetermined threshold before allowing normal discharge, preventing performance deterioration caused by low temperature conditions

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device enables performance recovery by executing a recovery protocol that involves repeated cycles of warming the battery to a threshold temperature and then discharging at a predetermined rate. This process can restore battery performance even after deterioration has occurred, allowing the battery to be reused without replacement

Inventive Principle:

Principle #34Discarding and recovering

3Power

If the battery discharges at high rates in cold temperatures, then power delivery is maintained, but performance deterioration accelerates

Engineering Contradiction:

Improvepower deliveryVSAvoidperformance stability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The control device dynamically adjusts the discharge rate based on real-time temperature monitoring. When the battery temperature is below the threshold, the control unit limits the discharge rate to a lower value; when temperature reaches the threshold, normal discharge rates are permitted, creating a dynamic adaptation to temperature conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control device continuously monitors battery temperature and uses this feedback to adjust discharge rate decisions. The control unit compares the current temperature against the predetermined threshold and automatically modifies the discharge rate accordingly, creating a closed-loop control system that prevents performance deterioration

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

The solution effectively improves and recovers the performance of lithium ion secondary batteries by managing discharge rates and temperatures, enabling their use in a wider temperature range without the need for replacement.

Implementation Method 1

a power storage portion (200)

Methodology Applied

Scientific EffectElectrochemical reactions: Redox Reactions

Data Source

PatentUS10056773B2Battery control device, control method, control system and electric vehicle

Publication Date: 2018.08.21 MURATA MFG CO LTD

AI summary

A battery package including a power storage portion; and a control device, where the control device determines if a first temperature of the power storage portion is higher than a predetermined temperature, and if the first temperature is higher than the predetermined temperature, discharges the power storage portion at a first discharge rate.