Solid-State Battery Module Temperature Control for Stable SOC Operation

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Solution Overview

Problem

All solid-state battery modules face challenges in maintaining stable charge and discharge properties due to fluctuations in State of Charge (SOC) and temperature, which affect energy efficiency.

Innovation Solution

An all solid-state battery unit is designed with an alternating temperature unit and control unit that adjusts temperature based on SOC and temperature values, using a heater to stabilize charge and discharge properties by increasing surface pressure through thermal expansion materials, thereby minimizing internal resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the all solid-state battery module operates at varying State of Charge and temperature conditions, then the battery can be used in different environments, but the charge and discharge properties become unstable and energy efficiency decreases

Engineering Contradiction:

Improveoperating environment rangeVSAvoidcharge and discharge property stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The control unit changes the temperature parameter of the battery module by controlling the heater to maintain optimal charge and discharge properties. When SOC drops below the threshold or temperature is below the threshold, the heater is activated to raise the temperature, thereby stabilizing the electrochemical reactions and maintaining reliable performance across different operating conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The control unit continuously monitors the State of Charge and temperature of the battery module and adjusts the heater operation accordingly. This closed-loop feedback control ensures that the battery maintains stable charge and discharge properties by compensating for SOC depletion and temperature variations, resolving the contradiction between adaptability and reliability.

Inventive Principle:

Principle #23Feedback

2Quantity of substance

If the State of Charge of the all solid-state battery module is lowered to increase energy density, then the battery capacity is effectively increased, but the charge and discharge properties deteriorate and energy efficiency decreases

Engineering Contradiction:

Improvebattery capacityVSAvoidenergy efficiency

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

The control unit changes the temperature parameter by activating the heater when SOC drops below the threshold. This temperature increase compensates for the property deterioration caused by low SOC, maintaining stable charge and discharge characteristics and energy efficiency even when the battery operates at lower charge levels to maximize effective capacity.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If the temperature of the all solid-state battery module is increased to improve charge and discharge properties, then energy efficiency is improved, but additional energy is consumed for heating

Engineering Contradiction:

Improveenergy efficiencyVSAvoidheating energy consumption

Core Design Contradiction:

Use of energy by moving objectVSUse of energy by stationary object

Solution Approach 1:

The control unit uses feedback control to activate the heater only when SOC or temperature drops below the threshold, and stops heating when the threshold is reached. This prevents unnecessary energy consumption while ensuring energy efficiency is maintained only when needed, resolving the contradiction between energy efficiency improvement and heating energy consumption.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The heater operates periodically based on the threshold conditions rather than continuously. It is activated only when the SOC or temperature falls below the threshold and deactivated when the threshold is restored, thereby minimizing energy consumption while maintaining energy efficiency during critical operating periods.

Inventive Principle:

Principle #19Periodic 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 solution effectively stabilizes charge and discharge properties, improving energy efficiency by controlling temperature and load applied to the battery cells, ensuring optimal performance across varying SOC and temperature conditions.

Implementation Method 1

an alternating temperature unit configured to heat or cool the all solid-state battery module

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

a surface pressure increasing member composed of a thermal expandable materials may be formed to come in contact with the all solid-state battery cell

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS20230318069A1All solid-state battery unit

Publication Date: 2023.10.05 HONDA MOTOR CO LTD

AI summary

An all solid-state battery unit includes: an all solid-state battery module in which a plurality of all solid-state battery cells are laminated and; an alternating temperature unit configured to heat or cool the all solid-state battery module; a control unit configured to control the alternating temperature unit, wherein the control unit controls the alternating temperature unit depending on either or both of values of a State of Charge of the all solid-state battery module and a temperature of the all solid-state battery module.