All Solid State Battery Cell Alignment Fixing Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In all solid state batteries, the difference in elasticity between anode and cathode active material layers can cause deformation and cracking of current collectors during production, and the arrangement of cells in series can lead to positional shifts, potentially resulting in short circuits, especially when high pressure is applied.
Innovation Solution
The implementation of a fixing portion, such as a tab and insulating portion arrangement, to securely position cells along the thickness direction, preventing shifts and potential short circuits by ensuring the tabs are fixed and insulated to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cells are arranged along the thickness direction to increase energy density, then the battery capacity is improved, but positional shifts occur during pressing causing short circuits
Solution Approach 1:
The patent applies preliminary action by forming protrusions on the current collector before assembling the battery cells. These protrusions are pre-positioned to engage with corresponding structures in adjacent cells, preventing positional shifts during the pressing process. This advance preparation ensures that when high pressure is applied to densify the battery, the cells remain properly aligned and cannot shift to cause short circuits between electrodes.
2Manufacturing precision
If high pressure is applied during production to densify layers, then the manufacturing precision is improved, but the current collector deforms and cracks occur in active material layers
Solution Approach 1:
The patent applies local quality by creating localized protrusions on specific regions of the current collector rather than uniformly thickening the entire collector. These localized structural enhancements provide targeted reinforcement at critical points where stress concentrates during pressing, allowing the current collector to withstand high pressing pressures without deformation or cracking, while maintaining overall manufacturing precision for layer densification.
Data Source
AI summary
An all solid state battery in which positional displacement of a plurality of cells arranged along a thickness direction can be prevented is provided. The all solid state battery includes a plurality of cells connected in series, wherein the all solid state battery includes a cell unit A and a cell unit B, a first current collector A in the cell A and a second current collector B in the cell B are arranged to face each other, the first current collector A includes a tab A, the second current collector B includes a tab B, and the tab A and the tab B are fixed by a fixing portion.