All-Solid Battery Edge Folding to Protect Electrode Laminates
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Solution Overview
Problem
Existing methods for forming all-solid battery modules result in reduced volume energy density due to damage to the electrode laminate during the folding of circumferential edge portions, and reducing the pressing load to prevent damage complicates miniaturization efforts.
Innovation Solution
A battery manufacturing method and device that form a bent portion of the circumferential edge by folding extension portions outside the electrode laminate, using a clamp to grip the root portion and a pressing portion to fold the surplus portion, thereby preventing load transmission to the electrode laminate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the circumferential edge portion is folded to miniaturize the battery cell, then volume energy density is improved, but the electrode laminate is damaged due to load transmission
Solution Approach 1:
The patent introduces an intermediary structure (the specific folding configuration with extension portions) that mediates between the pressing force and the electrode laminate. The bent portion with extension portions extending beyond the laminate acts as a buffer zone that absorbs and redirects forces, preventing direct load transmission to the laminate while still achieving the miniaturization effect through folding.
Solution Approach 2:
The patent solves the problem by transitioning from a simple planar fold to a three-dimensional folded structure with extension portions that protrude in the thickness direction. This dimensional change allows the folding to occur in multiple directions and planes, distributing the mechanical stress away from the electrode laminate while maintaining the volume reduction benefit.
2Reliability
If the pressing load is reduced to prevent electrode laminate damage, then quality is improved, but miniaturization becomes difficult
Solution Approach 1:
The patent applies preliminary action by pre-forming the bent portion with extension portions before the final folding operation. This preliminary structure preparation ensures that when folding occurs, the extension portions are already positioned to absorb and redirect forces, allowing high pressing loads to be applied without damaging the electrode laminate, thus enabling effective miniaturization.
3Quantity of substance
If multiple folds are applied to further miniaturize the battery, then volume energy density is improved, but additional load is applied to the electrode laminate causing quality deterioration
Solution Approach 1:
The patent implements nested doll principle by creating a hierarchical folding structure where the bent portion with extension portions is nested within the overall battery cell structure. The extension portions of the first fold create a protective layer that absorbs subsequent folding operations, allowing multiple folds to be applied for greater miniaturization without progressively damaging the electrode laminate, as each fold's extension portions protect against the next fold's stress.
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
Improves the quality and efficiency of volume energy density by preventing damage to the electrode laminate and enabling efficient temperature adjustment, leading to enhanced battery performance and longer lifespan.
Implementation Method 1
a clamp portion (101) configured to grip a root portion (56) of the circumferential edge portion (52)
Implementation Method 2
a pressing portion (102) configured to press a surplus portion (50) of the circumferential edge portion (52)
Implementation Method 3
The circumferential edge portion is formed by overlapping the exterior bodies and heat welding them together
Data Source
AI summary
An all solid battery cell includes an electrode laminate, an exterior body, and a bent portion. The bent portion includes a first extension portion, a second extension portion folded from a tip portion of the first extension portion, and a third extension portion folded from a tip portion of the second extension portion. A length between the tip portion of the first extension portion and the tip portion of the second extension portion is greater than a thickness of the electrode laminate.