Battery Tab Bend Structure to Prevent Multi-Tab Breakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The tabs in a multi-tab structure within a battery package are prone to breakage due to lack of cushioning and low degree of freedom, leading to safety failures during handling or use.
Innovation Solution
An electrochemical device is designed with a package, an electrode assembly, and a first adapter piece, where the electrode assembly includes a first tab group with bent sections that provide flexibility and cushioning, reducing stress on the electrode assembly during abnormal use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode terminal directly extends out of the package after being welded to tabs, then the multi-tab structure can improve fast-charge capability and reduce internal resistance, but the tabs are prone to breakage under stress due to lack of cushioning
Solution Approach 1:
The tab structure incorporates bent sections with curved geometries instead of straight rigid connections. The bent sections include first and second bent portions that form angular deviations from the original tab axis, creating a flexible S-shaped or zigzag configuration that can deform under stress without breaking
Solution Approach 2:
The tab structure transitions from a static rigid connection to a dynamic flexible connection. The bent sections allow the tab to change shape and absorb mechanical energy through deformation, enabling the structure to adapt to external forces during dropping, vibrating, or tugging events
2Device complexity
If the electrode terminal directly extends out of the package, then the structure is simple, but the tabs have low degree of freedom and are prone to fracture under stress
Solution Approach 1:
The tab structure incorporates bent sections with curved geometries instead of straight rigid connections. The bent sections include first and second bent portions that form angular deviations from the original tab axis, creating a flexible S-shaped or zigzag configuration that can deform under stress without breaking
Solution Approach 2:
The tab structure transitions from a static rigid connection to a dynamic flexible connection. The bent sections allow the tab to change shape and absorb mechanical energy through deformation, enabling the structure to adapt to external forces during dropping, vibrating, or tugging events
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
An electrochemical device (1) includes a package (10), an electrode assembly (20), and a first adapter piece (31). The electrode assembly (20) includes a first tab group (24). The first tab group (24) is electrically connected to the electrode assembly (20). The first tab group (24) is electrically connected to the first adapter piece (31) to form a first connecting portion (247). The first adapter piece (31) extends out of the package (10). A part that, in the first tab group (24), electrically connects the electrode assembly (20) and the first connecting portion (247), includes at least a first bent section (243) and a second bent section (244). The first bent section (243) and the second bent section (244) are bent in opposite directions.