Solid-State Battery Cell Edge Cuts for Short-Circuit Prevention
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Solution Overview
Problem
Batteries using solid electrolytes face reliability issues due to the absence of a separator, leading to potential short circuits caused by dielectric breakdown at cut surfaces during manufacturing.
Innovation Solution
Incorporating striated recesses or protrusions on the side surfaces of battery cells that are inclined with respect to the thickness direction, which increases the distance between the positive and negative electrode layers, thereby reducing the risk of edge surface discharge and short circuits, and employing a cutting method where the cutting blade slides in the length direction to form these features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery cell is cut with a cutting blade perpendicular to the thickness direction, then the cutting process is simple, but the distance between positive and negative electrode layers at the cut surface is short, causing dielectric breakdown and short circuits
Solution Approach 1:
The patent changes the cutting approach from a single perpendicular cut to an inclined cut that introduces a dimensional angle component. By cutting at an inclination angle relative to the thickness direction, the cut surface creates a longer path distance between positive and negative electrode layers, effectively using dimensional transformation to prevent dielectric breakdown while maintaining cutting process feasibility
2Reliability
If insulation treatment is applied to the cut surface, then short circuits are prevented, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by designing the cutting process itself to create the protective effect. Instead of applying insulation treatment after cutting, the inclined cut geometry is created during the cutting process, which inherently increases the distance between electrodes and prevents dielectric breakdown. This eliminates the need for separate insulation treatment steps, thereby maintaining high manufacturing efficiency while ensuring quality stability
3Reliability
If the cutting blade slides in the length direction during cutting, then striated recesses or protrusions are formed that increase electrode distance, but the cutting equipment becomes more complex
Solution Approach 1:
The patent applies dynamics by making the cutting blade movable in the length direction during the cutting process. This dynamic movement creates the inclined cut surface with striated recesses or protrusions that increase the electrode distance. The cutting equipment includes a movable cutting blade that can slide along the length direction while cutting, transforming a static cutting process into a dynamic one to achieve the reliability improvement
Data Source
AI summary
A battery includes battery cells. A battery cell includes a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer. On a side surface of the battery cell, in a plan view of the side surface of the battery cell, striated cut marks which are inclined with respect to the thickness direction of the battery cell are provided.