Battery Cell Bend Inspection for Heat Dissipation Consistency
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Solution Overview
Problem
The existing methods for inspecting battery cells fail to effectively determine whether a battery cell is good or bad based on the bent degree of the W-shaped bend formed on one side surface, which affects heat dissipation and the uniform application of the polymer resin layer in battery modules.
Innovation Solution
A battery cell inspection device and system that includes a data obtaining unit for scanning one side surface of the battery cell, a bend value determining unit for calculating the bent degree at each point, and a deciding unit that determines whether the battery cell is good or bad based on the calculated bend values and representative values for each region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the bridge part is bent to bring receiving parts into contact, then the battery cell structure is formed, but a W-shaped bend is generated on the side surface causing excessive space and deteriorated heat dissipation
Solution Approach 1:
The patent applies preliminary action by pre-forming the pouch case with a bent bridge part structure before inserting the electrode assembly. The receiving parts are pre-positioned to contact each other through the bent bridge, which prevents excessive bending after assembly and reduces the W-shaped bend on the side surface, thereby improving heat dissipation while maintaining structural integrity.
2Shape
If the bridge part is bent to bring receiving parts into contact, then the battery cell structure is formed, but the bent degree varies causing inconsistent polymer resin application
Solution Approach 1:
The pouch case is pre-formed with a controlled bent bridge part structure before electrode assembly insertion. This preliminary shaping ensures that the receiving parts are pre-positioned to contact each other with consistent geometry, which standardizes the side surface profile and enables uniform polymer resin application across different battery cells, improving manufacturing precision.
3Measurement precision
If scan data is collected from the entire side surface, then complete bend information is obtained, but inspection time and processing complexity increase
Solution Approach 1:
The patent extracts and focuses inspection on the critical region where the W-shaped bend occurs on the side surface, rather than scanning the entire surface. By identifying and concentrating measurement resources on the specific area containing the bend defect, the system achieves accurate bend detection while significantly reducing inspection time and data processing complexity.
Data Source
AI summary
The present invention relates to a battery cell of a secondary battery, and more particularly, to a battery cell inspection device and system for deciding whether a battery cell is good or bad based on a bent degree of a bend formed on one side surface of the battery cell.