Bi-polar Battery Electrode Segmentation for Short Circuit Prevention
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Solution Overview
Problem
Current bi-polar batteries face challenges in achieving high energy density due to low ion conductivity of solid electrolytes and the risk of short circuits from liquid electrolytes, which limits their practical application in large-scale energy storage systems.
Innovation Solution
A non-aqueous electrolyte battery design featuring bi-polar electrodes with non-aqueous electrolyte layers that prevent overlap between positive and negative active material layers, allowing for laminated structures that are spirally wound or divided to achieve high energy density and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a liquid electrolyte is used in a bi-polar battery, then ion conductivity is improved, but the risk of short circuit between electrode layers increases
Solution Approach 1:
The patent introduces a separator as an intermediary component between the positive and negative electrodes. This separator physically separates the liquid electrolyte layers, preventing direct contact between opposite polarity electrodes while still allowing ion transport through its porous structure, thus eliminating short circuit risk while maintaining high ion conductivity
Solution Approach 2:
The battery structure is segmented into distinct functional layers with separators positioned between electrode layers. This segmentation creates independent compartments for each electrode, allowing the use of liquid electrolyte for high ion conductivity while the separator segments prevent harmful direct contact between electrodes
2Object-affected harmful factors
If solid electrolyte is used in a bi-polar battery, then short circuit risk is reduced, but ion conductivity deteriorates
Solution Approach 1:
The separator acts as a mediator that enables the use of liquid electrolyte by providing physical separation. This intermediary structure allows the system to achieve both short circuit prevention (through physical separation) and high ion conductivity (through liquid electrolyte), resolving the contradiction between these two requirements
3Quantity of substance
If electrode areas are increased to achieve high energy density, then battery size increases, but the risk of liquid junction short circuit increases
Solution Approach 1:
The battery employs multiple separators that segment the electrode layers into independent compartments. This segmentation allows for increased electrode area and energy density while maintaining physical separation between opposite polarity electrodes, preventing liquid junction short circuits even in large-area configurations
Solution Approach 2:
Separators serve as intermediary barriers between enlarged electrode areas. These intermediaries enable the system to achieve high energy density through increased electrode surface area while simultaneously preventing harmful liquid junction short circuits by maintaining physical separation
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 achieves high energy density and low electrical resistance while preventing liquid junctions, facilitating the fabrication of compact bi-polar batteries with improved performance.
Implementation Method 1
a non-aqueous electrolyte layer isolating the positive-pole active material layer of one bi-polar electrode from the negative-pole active material layer of the other bi-polar electrode
Data Source
AI summary
A non-aqueous electrolyte battery includes bi-polar electrodes and non-aqueous electrolyte layers. Each electrode has a pyroelectric member and positive-pole and negative-pole active material layers on one and the other surfaces of the member. In the electrode, a position of the positive-pole layer does not overlap a position of the negative-pole layer in a thickness direction of the member. A laminated product in which the bi-polar electrodes are laminated with the electrolyte layers being interposed between the positive-pole and negative-pole active material layers on one and the other members is provided. The product has one of a first type electrode group in which the product is spirally wound and a second type electrode group in which the product is alternately bent, folded, and layered.