All-Solid-State Battery Case Structure for Cell Stack Insertion
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Solution Overview
Problem
The challenge of inserting a cell stack into a case is exacerbated by the use of an elastic sheet for volume compensation in all-solid-state batteries, which increases the cell stack's volume, making it difficult to fit within the case.
Innovation Solution
An all-solid-state battery design that includes a cell stack formed by stacking electrode plates with a solid electrolyte layer, an inner case formed by coupling first and second cases around the stack, a buffer tape attached to the inner case, and an outer case housing the inner case, with a cap plate connected to the outer case, and a buffer tape providing shock absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic sheet is inserted for volume compensation, then the anode plate volume change is absorbed, but the cell stack volume increases making insertion into the case difficult
Solution Approach 1:
The inner case is divided into a first case and a second case that are coupled together, creating a segmented structure that can accommodate the cell stack with reduced overall volume while maintaining the necessary buffer space for volume compensation
Solution Approach 2:
The cell stack is nested within the inner case, which is itself nested within the outer case, creating a multi-layer nested structure that optimizes space utilization and allows the cell stack to fit within the available volume
2Volume of moving object
If the cell stack volume is reduced to fit the case, then insertion becomes possible, but the ability to absorb volume changes during charging/discharging is compromised
Solution Approach 1:
The buffer tape is designed as a dynamic component that can expand and contract in response to volume changes in the cell stack during charging and discharging, providing adaptive volume compensation rather than a fixed rigid structure
Solution Approach 2:
The buffer tape changes its physical parameters (volume, shape) in response to the charging/discharging process, allowing it to absorb volume changes while maintaining a compact overall cell stack structure that fits within the case
3Ease of operation
If a compact design is used to fit the cell stack in the case, then insertion is facilitated, but protection against vibrations and shocks is reduced
Solution Approach 1:
The buffer tape is pre-installed between the inner case and outer case to provide cushioning protection before any vibrations or shocks occur, protecting the cell stack and electrode tabs from potential damage during handling and operation
Solution Approach 2:
The buffer tape acts as an intermediary layer between the inner case and outer case, absorbing and dissipating vibration and shock energy before it can reach the sensitive cell stack components, thereby protecting against harmful factors while maintaining compact dimensions
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 allows the cell stack to be accommodated within the outer case while absorbing vibrations and shocks, preventing damage to electrode tabs, and facilitating insertion.
Implementation Method 1
a buffer tape providing shock absorption
Data Source
AI summary
One embodiment provides an all-solid-state battery in which a cell stack can be inserted into a case.The all-solid-state battery includes a cell stack formed by stacking a first electrode plate, a solid electrolyte layer, and a second electrode plate, an inner case formed by coupling a first case (lower) and a second case with each other, each embedding both sides of the cell stack, a buffer tape attached to an outer surface of the inner case, an outer case embedding the inner case to which the buffer tape is attached, and a cap plate coupled to an opening of the outer case.