Battery Module Communication Hole Design for Clogging Prevention
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Solution Overview
Problem
The communication holes in battery modules are prone to clogging, especially when a safety valve is provided, due to their configuration and the need for precise alignment and sealing, which can lead to issues with electrolyte injection and gas discharge.
Innovation Solution
The battery module design includes communication holes with an opening end on the outer surface that is longer than the internal space, featuring a tapered portion for smooth injection and fewer steps or corners, along with primary and secondary seals, and protrusions for easy positioning and attachment of the safety valve, reducing the likelihood of clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication hole length is made equal to the internal space length, then the sealing is improved, but the clogging risk increases
Solution Approach 1:
The communication hole is designed to extend beyond the internal space boundary in advance, creating a protruding opening end that prevents clogging before it can occur. This preliminary extension ensures that the hole maintains clearance from electrode edges throughout operation, addressing the clogging risk proactively while maintaining effective sealing.
2Ease of operation
If the communication hole has a tapered portion, then the electrolyte injection is facilitated, but the manufacturing complexity increases
Solution Approach 1:
The communication hole features a tapered portion only at the opening end where electrolyte injection occurs, while the remaining portion maintains a simple cylindrical shape. This localized tapering provides the necessary flow characteristics for easy electrolyte injection without unnecessarily complicating the overall hole structure or manufacturing process.
3Object-affected harmful factors
If the opening end length is extended beyond internal space, then the clogging is suppressed, but the sealing body size increases
Solution Approach 1:
The communication hole extends slightly beyond the internal space boundary at the opening end, providing just enough additional length to prevent clogging by maintaining clearance from electrode edges. This partial extension achieves the necessary clogging prevention without excessively increasing the overall sealing body dimensions.
Data Source
AI summary
A battery module includes an electrode laminate including a plurality of electrodes that are laminated, and a sealing body sealing a side surface of the electrode laminate. The sealing body is provided with a communication hole communicating an internal space between the electrodes adjacent in a laminating direction in the electrode laminate. The communication hole includes an opening end on an outer surface of the sealing body. A length of the opening end in the laminating direction is longer than a length of the internal space in the laminating direction.