Multi-Pole Top Cover Assembly for High-Current Battery Cells
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Solution Overview
Problem
Conventional battery structural subassemblies have limited current-carrying ability and high internal resistance, leading to temperature rises and heat accumulation during charging and discharging, which can cause instability of the electrolyte and shrinkage of the separator, reducing the safety of the cell.
Innovation Solution
A top cover assembly is designed with a plurality of first and second poles arranged at intervals on the top cover, improving the overcurrent ability and temperature stability of the cells by enhancing the current output capacity and ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the capacity of energy storage batteries is increased, then the energy storage ability is improved, but the current-carrying ability of structural subassembly is insufficient leading to temperature rise and heat accumulation
Solution Approach 1:
The top cover is segmented into multiple poles (first poles and second poles) arranged in parallel, with each pole independently connected to tabs of the electrode assembly. This segmentation distributes the current across multiple pathways, reducing current density and heat generation in any single location, thereby solving the temperature rise problem associated with high-capacity batteries.
2Quantity of substance
If the capacity of energy storage batteries is increased, then the energy storage ability is improved, but the internal resistance of structural subassembly increases causing heat accumulation
Solution Approach 1:
Multiple poles are electrically merged through parallel connection to the electrode assembly tabs. This merging creates multiple parallel current pathways, effectively reducing the total internal resistance of the top cover assembly. The combined effect of multiple parallel conductors provides lower overall resistance, reducing energy loss and heat accumulation in high-capacity battery applications.
3Power
If multiple poles are arranged on the top cover, then the overcurrent ability is improved, but the device complexity increases
Solution Approach 1:
The top cover assembly serves multiple functions simultaneously: it provides structural support, acts as a current collector with multiple poles for high overcurrent ability, and facilitates thermal management through distributed pole arrangement. The same multi-pole structure that increases power capability also serves as the structural framework, avoiding the need for separate components and thus limiting the increase in overall device complexity.
Data Source
AI summary
A top cover assembly and a cell are disclosed by this disclosure. The top cover assembly includes: a top cover; a plurality of first poles arranged on the top cover at intervals along a first direction; a plurality of second poles arranged on the top cover at intervals along the first direction, at least one of the plurality of the first poles and at least one of the plurality of the second poles are arranged adjacent along the first direction; the plurality of the first poles and the plurality of the second poles are arranged at a same end of the top cover, or the plurality of the first poles are arranged near one end of the top cover, and the plurality of the second poles are arranged near the other end of the top cover.