Cylindrical Cell Tab Segmentation for Infiltration and Gas Exhaust
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Solution Overview
Problem
Existing cylindrical cells face issues with electrolyte infiltration and gas exhaust due to high-density tabs caused by unprocessed flat surfaces, leading to reliability concerns.
Innovation Solution
The cylindrical cell design includes a first tab region with a specific ratio to the surrounding wall radius, allowing partial tab coverage and reducing weight, combined with a connecting piece for electrical connection, and a liquid injection hole for improved electrolyte infiltration and gas exhaust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire end surface of the electrode assembly is covered by the kneaded tab, then the tab provides complete electrical connection, but it causes difficulty in exhausting the cylindrical cell and poor electrolyte infiltration
Solution Approach 1:
The tab is segmented into a first tab and a second tab, where the first tab is positioned at the first end of the electrode assembly and the second tab is positioned at the second end. This segmentation allows the tabs to be distributed across different regions, preventing complete coverage of the end surface and creating channels for electrolyte infiltration and gas exhaust while maintaining electrical connection reliability.
Solution Approach 2:
Different regions of the electrode assembly are assigned different functions: the first tab region provides electrical connection at the first end, while the second tab region provides electrical connection at the second end. This local differentiation ensures that no single region is completely covered by tabs, allowing localized electrolyte infiltration and gas exhaust pathways to exist.
2Object-generated harmful factors
If the tab is processed with cutting and concentrated near the centerline, then electrolyte infiltration and gas exhaust are improved, but the electrical connection area is reduced
Solution Approach 1:
The electrical connection function is extended from a single-dimensional tab at one end to a two-dimensional distribution across both ends of the electrode assembly. By positioning tabs at both the first end and the second end, the electrical connection pathway is distributed across multiple dimensions, compensating for the reduced tab area at each individual end while maintaining overall connection reliability.
Data Source
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AI summary
The disclosure relates to a cylindrical cell including: a housing (1), having an end wall (11) and a surrounding wall (12) enclosing the end wall (11); an electrode pole (2), penetrating through the end wall (11) and being connected to the end wall (11) in an insulated manner; a electrode assembly (3), arranged in the housing (1), wherein the electrode assembly (3) includes a electrode assembly body (31) and a first tab (32), the first tab (32) is located at the first end of the electrode assembly body (31) facing the electrode pole (2), the orthographic projection of the first tab (32) on the first end of the electrode assembly body (31) is the first tab region (320), and the distance between any point on the outer boundary of the first tab region (320) and the inner side of the surrounding wall (12) is L1, a radius of the inner side of the surrounding wall (12) is R0, and the ratio of L1 to R0 ranges from 0.3 to 0.7.