Battery with Localized Binder Concentration for Bend Strain Management
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Solution Overview
Problem
Existing battery designs face challenges in achieving high energy density due to the adverse effects of binder concentrations on charge-discharge characteristics, particularly in bend portions where strain and internal stresses lead to degradation.
Innovation Solution
The battery design incorporates a layered structure with varying binder concentrations in different portions, where the linear portion has a lower binder concentration and the bend portion has a higher binder concentration, inhibiting energy density reduction from both binder and strain-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binder concentration is increased in the bend portion to inhibit strain-related degradation, then reliability is improved, but energy density is reduced
Solution Approach 1:
The patent applies different binder concentrations to different portions of the battery: the bend portion has a higher binder concentration (Cp2, Cn2, Ce2) to withstand strain and maintain reliability, while the linear portion has a lower binder concentration (Cp1, Cn1, Ce1) to maximize energy density. This local differentiation resolves the contradiction by optimizing each region for its specific functional requirements.
Solution Approach 2:
The battery is segmented into distinct portions (bend portion and linear portion) with independently optimized binder concentrations. The bend portion is separated as a special region requiring higher binder content for mechanical stability, while the linear portion is optimized for energy storage capacity, thus resolving the trade-off between reliability and energy density.
2Quantity of substance
If binder concentration is decreased in the linear portion to increase energy density, then energy density is improved, but charge-discharge characteristics deteriorate
Solution Approach 1:
The linear portion is designed with locally optimized lower binder concentration compared to the bend portion, allowing energy density to be maximized in regions where mechanical stress is minimal, while still maintaining adequate charge-discharge characteristics through the differentiated concentration gradient.
3Reliability
If uniform high binder concentration is used throughout the battery to ensure structural integrity, then reliability is improved, but energy density is significantly reduced
Solution Approach 1:
Instead of uniform binder concentration, the patent implements local quality differentiation where only the bend portion (which experiences mechanical stress) has high binder concentration for structural integrity, while the linear portion maintains lower binder concentration for energy density, thus resolving the contradiction through spatially differentiated material properties.
Solution Approach 2:
The battery structure is segmented into functional zones with different binder requirements. The bend portion is identified as a critical structural zone requiring high binder content, while the linear portion is optimized for energy storage with lower binder content, eliminating the need for uniformly high binder concentration throughout the entire battery.
Data Source
AI summary
A battery includes a first portion and a second portion, in which the first portion includes a first positive electrode layer, a first negative electrode layer, and a first solid electrolyte layer located between the first positive electrode layer and the first negative electrode layer, in which the second portion includes a second positive electrode layer, a second negative electrode layer, and a second solid electrolyte layer located between the second positive electrode layer and the second negative electrode layer, in which the first portion and the second portion are in contact with each other, the second portion is more sharply bent than the first portion, and at least one of Cp1<Cp2, Ce1<Ce2, and Cn1<Cn2 is satisfied.