Threaded Cell Holder Assembly for Precise Battery Cell Venting
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Solution Overview
Problem
Existing battery packs face challenges in locating battery cells on the cell holder, controlling potting resin leakage into vent channels, and ensuring secure and reversible fastening during assembly.
Innovation Solution
A cell holder tray with integrated vent passages and threaded features allows battery cells to be threadedly joined, using threaded sleeves or inserts, which facilitate self-location and reversible fastening, preventing potting resin leakage into vent channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional non-threaded cell holder designs are used, then assembly is simpler, but cell location precision and fastening security deteriorate
Solution Approach 1:
The patent combines the cell holder tray, vent passages, and threaded fastening features into a single integrated component. The threaded features are molded directly into the cell holder tray, eliminating the need for separate fastening mechanisms while providing precise cell location and secure attachment.
Solution Approach 2:
The cell holder tray serves multiple functions simultaneously: it provides structural support, defines vent passages for gas flow, incorporates threaded features for cell attachment, and includes recesses for potting resin. This multi-functionality reduces the number of separate components needed.
2Reliability
If potting resin is applied generously for electrical isolation, then electrical isolation improves, but leakage into vent channels increases
Solution Approach 1:
The cell holder tray incorporates specific recesses or cavities designed to contain potting resin at localized areas around each cell. These recesses provide a defined space for the resin to fill, ensuring electrical isolation without allowing excess resin to leak into the vent channels.
3Ease of repair
If traditional fastening methods are used, then assembly is faster, but reversibility and servicing ease deteriorate
Solution Approach 1:
The threaded fastening system provides dynamic adjustability, allowing cells to be easily attached and detached multiple times. The threads enable reversible fastening that can be tightened or loosened as needed, facilitating both rapid assembly and easy servicing without permanent attachment.
4Reliability
If vent passages are kept open for gas flow, then venting function improves, but potting resin contamination increases
Solution Approach 1:
The venting system is segmented into separate functional zones: open vent passages for gas flow and recesses for potting resin containment. The recesses act as barriers that physically separate the potting material from the vent channels, allowing both functions to operate simultaneously without interference.
Data Source
AI summary
A rechargeable energy storage system includes a cell holder tray including a plurality of vent passages each aligned with a corresponding one of a plurality of threaded features. A plurality of battery cells are each threadedly joined to a respective one of the plurality of threaded features of the cell holder tray.