Battery Current Collector Structure to Prevent Electrode Plate Peeling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary batteries face issues with poor electrochemistry performance and safety due to the peeling off of the film or powder of the electrode plate during assembly, caused by external forces applied during the bending of the current collecting member.
Innovation Solution
The secondary battery design includes a current collecting member with a connecting component and an adapting piece of different rigidities, where the connecting component is more easily deformed than the guiding section, reducing stress and deformation when bent, thus minimizing contact with the main body and preventing peeling of the electrode plate material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the current collecting member adopts an integrally formed structure with bend structure, then the structural strength is improved and welding reliability to the tab is increased, but the deformation of the guiding section toward the main body occurs during bending, causing peeling off of the film or powder of the electrode plate
Solution Approach 1:
The current collecting member is divided into two separate parts: the connecting component and the adapting piece. The adapting piece includes the guiding section with different rigidity, while the connecting component provides structural strength. This segmentation allows each part to perform its specific function without causing harm to the electrode plate.
Solution Approach 2:
The adapting piece is designed with local quality differentiation through its guiding section having different rigidity compared to other parts. This localized property change allows the guiding section to deform in a controlled manner during bending, reducing stress concentration and preventing peeling of the electrode plate material while maintaining overall structural integrity.
2Reliability
If the connecting component and adapting piece are separately provided and connected, then the deformation of the guiding section is reduced and electrochemistry performance is improved, but the device complexity increases
Solution Approach 1:
The current collecting member is segmented into separately provided connecting component and adapting piece that are connected together. This segmentation enables independent optimization of each component's properties - the adapting piece can be designed with specific rigidity characteristics to protect the electrode plate, while the connecting component maintains structural strength, thereby improving electrochemistry performance without excessive complexity.
Data Source
AI summary
The present application discloses a secondary battery, a battery module, and a device using the secondary battery as a power source. The secondary battery includes: a casing; an electrode assembly disposed in the casing; a cap assembly; and a current collecting member including an adapting piece and a connecting component provided separately and connected with each other; the adapting piece connected with the electrode terminal of the cap assembly and including a guiding section; the connecting component including a current collecting section to be connected with the guiding section and a tab connecting section to be connected with the electrode assembly; and the connecting component has a rigidity less than that of the guiding section, so that deformation of the guiding section toward the electrode assembly can be reduced when a portion of the connecting component connected with the electrode assembly is bent with respect to the length direction.