Non-aqueous Battery Solid Electrolyte Gas Generation for Overcharge Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face performance deterioration and ineffective overcharge protection due to the addition of gas generating agents, which can inhibit battery reactions and fail to reliably operate the electricity shut-off mechanism.
Innovation Solution
Incorporating a solid electrolyte layer in the positive or negative electrode mixture layers or terminals that produces gas when the battery voltage exceeds the maximum operating power, increasing internal pressure to activate the electricity shut-off mechanism without confining gas within the electrode layers, thus preventing performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas generating agent is added to the electrolytic solution to ensure reliable operation of the electricity shut-off mechanism during overcharging, then the electricity shut-off mechanism can be reliably operated, but battery performance such as input-output characteristics and energy density deteriorates
Solution Approach 1:
The gas generating function is segmented from the electrolytic solution and assigned to a specific solid electrolyte layer. This layer is formed only on unformed portions of the electrode current collector, separating the gas generation function from the battery reaction function, thereby eliminating performance deterioration while maintaining reliable shut-off mechanism operation.
Solution Approach 2:
The solid electrolyte layer with gas generating capability is applied locally only to unformed portions of the current collector, not the entire electrode surface. This localized application ensures gas generation occurs only where needed for shut-off mechanism operation, preventing interference with battery reactions in the formed portions.
2Device complexity
If a gas generating agent is added to the positive electrode mixture layer or negative electrode mixture layer, then the gas generating agent can be integrated into the electrode structure, but the generated gas is confined in the electrode mixture layer and fails to operate the electricity shut-off mechanism
Solution Approach 1:
The current collector surface is segmented into formed portions (for battery reaction) and unformed portions (for gas generation). The solid electrolyte layer is applied only to unformed portions, allowing gas to generate in open spaces where it can effectively increase internal pressure and operate the shut-off mechanism.
Solution Approach 2:
The unformed portion of the current collector acts as an intermediary structure that facilitates gas release from the electrode into the battery interior. By placing the solid electrolyte layer on this intermediary surface, gas can be generated and released without being confined within the dense electrode mixture layer.
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 allows for reliable operation of the electricity shut-off mechanism during overcharging without affecting battery performance, ensuring safe operation and maintaining energy density.
Implementation Method 1
the non-aqueous solvent and the like of the electrolytic solution are electrolyzed to generate gas
Data Source
AI summary
Provided is a non-aqueous electrolyte secondary battery capable of reliably operating an electricity shut-off mechanism at overcharging without deteriorating battery performance. The non-aqueous electrolyte secondary battery (1) includes, in a container (2): a positive electrode (41); in-container positive electrode terminals (21) and (23); a negative electrode (42); in-container negative electrode terminals (22) and (24); a non-aqueous electrolyte solution; and an electricity shut-off mechanism (68b) capable of shutting off energization with the outside of the container when the internal pressure of the container rises. A solid electrolyte layer that produces gas allowing the electricity shut-off mechanism (68b) to be operated is included in at least one member of a positive electrode mixture layer unformed portion (41b), a negative electrode mixture layer unformed portion (42b), the in-container positive electrode terminals (21) and (23), and the in-container negative electrode terminals (22) and (24).