Pouch Solid-State Battery Reference Electrode for Accurate Voltage Sensing
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Solution Overview
Problem
All-solid-state batteries lack a reference electrode for accurate measurement of electrode reactions and voltage variations, leading to difficulties in analyzing cell performance due to varying design structures, especially in lithium secondary batteries using solid electrolytes.
Innovation Solution
A pouch-type all-solid-state battery design incorporating a reference electrode with a second current collector layer having a hole for the ion transfer layer to fill, ensuring a shorter ion transfer path and preventing damage to solid electrolyte layers, allowing for accurate potential measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference electrode is added to enable accurate voltage measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The reference electrode is nested within the pouch-type battery structure by forming a hole through the second current collector layer and filling it with ion transfer layer, allowing the reference electrode to be integrated into the existing battery architecture without requiring a completely separate cell design
Solution Approach 2:
The reference electrode is positioned in the thickness direction of the battery through the hole in the current collector layer, utilizing the vertical dimension to accommodate the additional electrode without significantly increasing the planar area or overall device complexity
2Measurement precision
If a hole is formed in the second current collector layer for reference electrode placement, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The hole in the current collector layer serves as a porous structure that allows the ion transfer layer to fill and establish ionic contact with the reference electrode, transforming the manufacturing challenge of precise hole formation into a functional advantage where the porous structure facilitates self-alignment through material filling
3Productivity
If the ion transfer layer fills the hole to create a shorter ion transfer path, then productivity is improved, but device complexity increases
Solution Approach 1:
The hole is pre-formed in the current collector layer before final assembly, and the ion transfer layer is positioned to fill this pre-prepared space, allowing the shorter ion transfer path to be achieved through advance preparation rather than complex post-assembly adjustments
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 design enables secure cell performance with specifications similar to actual batteries, providing stable and accurate voltage measurements of electrodes, preventing measurement errors and maintaining cell integrity.
Implementation Method 1
an ion transfer layer disposed on the second current collector layer... at least a portion of the ion transfer layer fills the hole
Implementation Method 2
a reference electrode disposed on the ion transfer layer... the reference electrode only measures a voltage without application of current thereto
Data Source
AI summary
A pouch type all-solid-state battery including a reference electrode is disclosed. In the all-solid-state battery, a potential variation of each electrode is accurately measured because the ion transfer path between the reference electrode and a positive electrode/negative electrode is short. Accordingly, the all-solid-state battery secures a desired cell performance while having battery specifications similar to actual battery specifications.