Non-aqueous Battery Intermediate Layer Arc-Shaped Insulating Particles
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Solution Overview
Problem
Existing non-aqueous electrolyte secondary batteries face challenges in inhibiting short-circuit currents due to uneven packing of insulating and conductive particles in the intermediate layer, leading to regions with low electrical resistance and increased short-circuit currents.
Innovation Solution
The battery design incorporates an intermediate layer with hollow particles that break under compression, forming arc-shaped insulating particles with a biased distribution of conductive particles on the outer circumference, which inhibits the formation of low-resistance current pathways by ensuring dense packing and controlled conductive particle distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating particles are used in the intermediate layer, then short-circuit current is inhibited, but the compression rate cannot be increased due to the hardness of insulating particles
Solution Approach 1:
The patent changes the physical state parameter of insulating particles from solid to hollow structure. This parameter change allows the particles to be compressed more easily while maintaining their insulating function, thereby resolving the contradiction between achieving high compression rate and using hard insulating particles.
Solution Approach 2:
The patent creates a composite intermediate layer containing both hollow insulating particles and conductive particles. The hollow insulating particles provide compression capability and structural framework, while conductive particles fill spaces and provide electrical pathways. This composite structure resolves the contradiction by combining the advantages of both particle types.
2Reliability
If a low compression rate intermediate layer is formed, then insulating particles can be used, but uneven packing occurs leading to regions with low electrical resistance
Solution Approach 1:
By changing insulating particles from solid to hollow structure, the patent enables high compression rate achievement. This parameter change ensures uniform packing of particles in the intermediate layer, eliminating uneven regions that would create low-resistance pathways, thus resolving the contradiction between short-circuit inhibition and packing uniformity.
Solution Approach 2:
The patent creates a uniformly distributed composite structure where hollow insulating particles and conductive particles are evenly mixed throughout the intermediate layer. This local quality distribution ensures consistent electrical resistance properties across all regions, preventing localized low-resistance pathways while maintaining overall short-circuit inhibition capability.
3Use of energy by moving object
If more conductive particles are added to improve conductivity, then normal operation resistance decreases, but short-circuit current increases
Solution Approach 1:
The patent creates a non-uniform distribution of conductive particles within the composite intermediate layer. Conductive particles are strategically positioned to provide necessary electrical conductivity for normal battery operation while being constrained by the hollow insulating particle framework to prevent formation of continuous high-conductivity pathways that would enable short-circuit currents.
Solution Approach 2:
The composite structure combining hollow insulating particles with conductive particles allows the system to achieve optimal balance between conductivity and short-circuit inhibition. The insulating particles provide structural framework and short-circuit protection, while conductive particles fill interstices and provide necessary electrical pathways for normal operation.
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
This configuration effectively inhibits the increase of short-circuit currents while maintaining low resistance during normal battery operation, as demonstrated by the controlled distribution of conductive particles and the arc shape of insulating particles, enhancing the battery's safety and performance.
Implementation Method 1
Compression of the intermediate layer causes breakage of the hollow particles. Breakage of the hollow particles causes formation of insulating particles
Implementation Method 2
More conductive particles are present on an outer-circumference side of each arc shape than on an inner-circumference side of the arc shape
Data Source
AI summary
A non-aqueous electrolyte secondary battery includes at least an electrode composite material layer, an intermediate layer, and an electrode current collector. Intermediate layer is interposed between electrode composite material layer and electrode current collector. Intermediate layer contains at least insulating particles and conductive particles. Each insulating particle has an arc shape in a cross section of intermediate layer along a thickness direction. More conductive particles are present on an outer-circumference side of each arc shape than on an inner-circumference side of the arc shape.