Solid-State Battery Flowable Sealant for Moisture Protection
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Solution Overview
Problem
Solid-state lithium batteries with sulfide-based solid electrolyte membranes face degradation due to moisture ingress, and existing high-temperature curing resin sealants can crack when the power generation element expands or contracts, allowing moisture to enter and cause further degradation.
Innovation Solution
A solid-state battery design that uses a flowable, non-reactive sealant, such as hydrophobic liquids like liquid paraffin, to soak the power generation element, allowing for volume changes without cracking and preventing moisture ingress, while also incorporating features like internal pressure adjustment and agitation to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-temperature curing resin sealant is used to seal the power generation element, then moisture protection is improved, but crack resistance during volume change deteriorates
Solution Approach 1:
The patent changes the physical state of the sealant from solid (high-temperature curing resin) to liquid (flowable sealant). This parameter change allows the sealant to remain flexible and adapt to volume changes of the power generation element during charge/discharge cycles, preventing cracks while maintaining moisture protection.
Solution Approach 2:
The flowable sealant acts as an intermediary substance between the power generation element and the external environment. It provides moisture protection while accommodating volume changes, serving as a flexible barrier that neither rigidly constrains nor compromises the sealed element.
2Object-affected harmful factors
If rigid sealing structure is used to prevent moisture entry, then moisture protection is improved, but adaptability to volume change deteriorates
Solution Approach 1:
The patent employs a dynamic sealing approach where the flowable sealant can continuously adjust its shape and position in response to volume changes of the power generation element. Unlike static rigid structures, the liquid sealant dynamically adapts to maintain sealing effectiveness throughout operational cycles.
Solution Approach 2:
The patent utilizes hydraulic principles by employing a liquid (flowable sealant) as the sealing medium. The liquid properties enable the sealant to flow and conform to changing geometries of the power generation element, providing adaptive sealing that accommodates volume expansion and contraction.
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 prevents cracks and degradation of the sulfide-based solid electrolyte membrane by allowing the battery to flex with volume changes and maintaining a moisture-free environment, improving the battery's durability and power generation efficiency.
Implementation Method 1
a flowable sealant which is non-reactive with the sulfide-based solid electrolyte membrane, the power generation element being soaked in the flowable sealant... the flowable sealant may be a hydrophobic liquid
Data Source
AI summary
A solid-state battery has a power generation element (5) having a cathode layer (1), a sulfide-based solid electrolyte membrane (2), an anode layer (3) that are stacked in this order; a battery case (6) in which the power generation element is disposed; and a flowable sealant (7) provided in the battery case and being non-reactive with the sulfide-based solid electrolyte membrane, the power generation element being soaked in the flowable sealant.