Stacked Battery Electrolyte Layers for Voltage Consistency
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Solution Overview
Problem
Assembled batteries with stacked unit cells experience uneven temperature distribution during charge and discharge, leading to variations in resistance values and voltage among unit cells, which hinders uniform charge and discharge control.
Innovation Solution
The battery design incorporates electrolyte layers with varying particle densities, thicknesses, or materials along the stacking direction, with higher resistance at the central position to mitigate temperature-induced variations in output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all unit cells have the same structure, then manufacturing is simplified, but temperature-induced resistance variations cause voltage inconsistencies
Solution Approach 1:
The patent applies local quality by making the electrolyte layers have different resistance values based on their position in the stacking direction. Specifically, electrolyte layers at different heights have different thicknesses or particle densities, creating position-dependent resistance characteristics that compensate for temperature distribution variations throughout the battery stack.
Solution Approach 2:
The patent changes physical parameters of the electrolyte layers, specifically thickness and particle density, to achieve different resistance values at different positions. The electrolyte layer thickness or particle density is adjusted according to position, transforming a uniform structure into a non-uniform one that optimizes performance under temperature gradients.
2Device complexity
If electrolyte layers have uniform properties, then device complexity is reduced, but output variations occur due to temperature distribution
Solution Approach 1:
The patent implements local quality by assigning different resistance characteristics to electrolyte layers at different positions in the stacking direction. This is achieved by varying the thickness or particle density of electrolyte layers based on their vertical position, creating a non-uniform structure that compensates for temperature-induced output variations.
Solution Approach 2:
The patent applies preliminary anti-action by pre-configuring the electrolyte layers with different resistance values before the battery operates. This pre-established resistance gradient counteracts the temperature distribution effects that would otherwise cause output variations, effectively compensating for the problem before it occurs during battery operation.
3Reliability
If charge/discharge control is based on the lowest voltage unit cell, then overcharging is prevented, but overall battery utilization decreases
Solution Approach 1:
The patent applies local quality by creating position-dependent resistance characteristics in the electrolyte layers. This ensures that each unit cell has optimized resistance properties for its specific thermal environment, allowing all unit cells to operate within safe voltage ranges simultaneously and enabling full battery utilization without compromising safety.
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 approach ensures consistent voltage and input/output values across unit cells, allowing for uniform charge and discharge control and extended battery life by preventing overcharging or overdischarging.
Implementation Method 1
the electrolyte layer at the second position has a resistance value higher than a resistance value of the electrolyte layer at the first position
Implementation Method 2
the electrolyte layer at the second position may contain the group of particles at a density lower than that of the group of particles the electrolyte layer at the first position
Data Source
AI summary
In a stacked battery including a plurality of electrolyte layers having substantially the same resistance value, an uneven temperature distribution during charge and discharge changes the resistance values of solid electrolyte layers to cause variations in output among a plurality of unit cells in a stacking direction. A power storage device includes a plurality of electrolyte layers which are stacked with an electrode element interposed between them, wherein the plurality of electrolyte layers include an electrolyte layer provided at a first position in a stacking direction and an electrolyte layer provided at a second position different from the first position, heat radiation being lower at the second position than at the first position, and the electrolyte layer at the second position has a resistance value higher than that of the electrolyte layer at the first position.