Pouch Battery Concave Steps Restrain Electrode Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pouch-shaped secondary batteries face safety issues due to internal short circuits caused by electrode assembly movement during external impacts, such as dropping, which can lead to thermal runaway and explosion, and have difficulties in easy installation and deformation of the battery case.
Innovation Solution
The battery case features concave steps at the inner upper end and opposite sides to securely hold the electrode assembly, preventing movement and short circuits, and facilitating easy installation and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the battery case is made simple and easy to deform, then manufacturing processability is improved, but the electrode assembly cannot be securely restrained during external impacts
Solution Approach 1:
The battery case is designed with localized concave steps at specific positions (inner upper end and inner opposite sides of the receiving part) rather than making the entire case complex. These localized structural features provide the necessary restraint function while keeping the rest of the case simple and easy to manufacture.
Solution Approach 2:
The concave steps are formed in advance during the battery case manufacturing process, creating pre-positioned restraint structures that automatically guide and secure the electrode assembly in the correct position before the battery is assembled or subjected to external impacts.
2Reliability
If the battery case is deformed to fit the electrode assembly tightly, then electrode assembly restraint is improved, but installation becomes difficult
Solution Approach 1:
Instead of deforming the entire battery case, only localized concave steps are formed at the inner upper end and inner opposite sides of the receiving part. These localized features provide restraint without requiring complex overall deformation of the case, thus maintaining ease of installation.
Solution Approach 2:
The restraint function is segmented into multiple discrete concave steps positioned at different locations within the receiving part. This segmentation allows the electrode assembly to be guided and restrained progressively as it is installed, rather than requiring forceful deformation of the entire case structure.
3Reliability
If concave steps are formed at the inner upper end and opposite sides of the receiving part, then electrode assembly movement is restrained, but manufacturing complexity increases
Solution Approach 1:
The concave steps are formed only at the specific locations where restraint is needed (inner upper end and inner opposite sides of the receiving part), rather than complexifying the entire battery case structure. This localized approach provides effective restraint while minimizing overall structural complexity.
Solution Approach 2:
The concave steps introduce curved surfaces into the otherwise simple battery case structure. These curved features are minimal and localized, providing the necessary restraint function through their geometric shape without significantly increasing manufacturing complexity.
Data Source
AI summary
Disclosed herein is a secondary battery including an electrode assembly, having pluralities of electrode tabs joined to electrode leads, mounted in a receiving part of a battery case, wherein the battery case has concave steps formed at the inner upper end of the receiving part thereof between electrode tab-electrode lead coupling portions (a cathode terminal portion and an anode terminal portion) of the electrode assembly and at the inner opposite sides of the receiving part thereof corresponding to the opposite sides of the electrode assembly such that the electrode assembly is in tight contact with the concave steps.