Flexible Secondary Battery Electrolyte Ratio for Heat and Gas Suppression

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Solution Overview

Problem

Existing secondary batteries have insufficient battery characteristics, necessitating improvements to achieve better performance.

Innovation Solution

A secondary battery design featuring an exterior member with flexibility, housing a positive electrode, a negative electrode, and an electrolytic solution with a solvent composition of propyl acetate and propyl propionate, where the ratio of propyl acetate to the sum of both solvents is between 0.1 and 0.5.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If conventional electrolytic solutions are used, then battery operation is maintained, but heat generation and gas production occur during charge and discharge

Engineering Contradiction:

Improveheat generationVSAvoidbattery characteristics

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the electrolytic solution by using propyl acetate and propyl propionate in a specific ratio (0.1 to 0.5), which modifies the electrochemical properties to suppress heat generation and gas production while maintaining reliable battery operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite electrolytic solution system combining propyl acetate and propyl propionate esters, where the synergistic interaction between these two components achieves superior thermal and gaseous stability compared to single-component systems

Inventive Principle:

Principle #40Composite materials

2Object-generated harmful factors

If conventional electrolytic solutions are used, then battery operation is maintained, but gas production and swelling occur

Engineering Contradiction:

Improvegas productionVSAvoidbattery characteristics

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent modifies the electrolytic solution composition parameters by selecting specific ester compounds (propyl acetate and propyl propionate) with controlled ratios, which reduces gas generation during electrochemical reactions and prevents battery swelling while ensuring operational reliability

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If propyl acetate and propyl propionate are used in appropriate ratio, then heat generation is suppressed, but solvent composition must be precisely controlled

Engineering Contradiction:

Improveheat generationVSAvoidsolvent composition ratio

Core Design Contradiction:

Loss of energyVSManufacturing precision

Solution Approach 1:

The patent defines a specific parameter range (ratio of propyl acetate to total solvent between 0.1 and 0.5) that balances heat suppression performance with manufacturing feasibility, allowing sufficient tolerance for production while achieving the desired thermal management effect

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250183374A1Secondary battery

Publication Date: 2025.06.05 MURATA MFG CO LTD

AI summary

A secondary battery is provided and includes an exterior member having flexibility, and a positive electrode, a negative electrode, and an electrolytic solution that are housed in the exterior member. The electrolytic solution contains a solvent and an electrolyte salt, and the solvent contains propyl acetate and propyl propionate. The ratio of the content of propyl acetate in the solvent to the sum of the content of propyl acetate in the solvent and the content of propyl propionate in the solvent is 0.1 or more and 0.5 or less.