Battery Pack Fastener Venting for Moisture Corrosion Prevention
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Solution Overview
Problem
Lithium secondary batteries are vulnerable to damage from moisture exposure, leading to fastening member corrosion and weakened coupling forces, which compromises the integrity and safety of the battery pack.
Innovation Solution
A battery pack design featuring a case with a drain hole in the side plate to expose the fastening member, a gasket for sealing, and a filter with air permeability to discharge moisture, ensuring effective moisture evaporation and improved sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a battery pack is designed to fit into a specific space with a predetermined receptacle configuration, then the battery pack can be properly installed and electrically connected, but the design flexibility and adaptability to different receptacle configurations are reduced
Solution Approach 1:
The battery pack is divided into modular components including a battery module, a housing with receptacles, and a cover assembly. The receptacles are segmented into different types (first receptacles for rigid tabs, second receptacles for flexible tabs) that can be independently configured. This segmentation allows the battery pack to accommodate different tab configurations without redesigning the entire structure.
Solution Approach 2:
The housing is designed with universal receptacle structures that can accommodate multiple types of battery tabs. The first receptacles can receive both rigid tabs and flexible tabs, while the second receptacles are specifically configured for flexible tabs. This multi-functional design allows a single battery pack structure to work with different battery module configurations, enhancing adaptability.
2Adaptability or versatility
If the battery pack structure is made rigid and fixed, then manufacturing and assembly are simplified, but the ability to accommodate different battery module configurations and tab types is reduced
Solution Approach 1:
The battery pack design incorporates flexible elements that allow dynamic adaptation to different configurations. The flexible tabs can be received in either first or second receptacles depending on the battery module type. The cover assembly can be positioned in different orientations (first position or second position) to accommodate different tab arrangements, providing manufacturing flexibility without requiring completely different tooling or processes.
3Reliability
If the battery pack uses a simple cover design, then manufacturing costs are reduced, but protection against foreign object insertion and electrical shorting is insufficient
Solution Approach 1:
The cover assembly is designed with preliminary protective features that prevent foreign object insertion before it can cause damage. The cover includes structured receptacles that only accept properly configured battery tabs, and the cover itself acts as a barrier that must be properly installed to allow electrical connections. This preliminary protection prevents foreign objects from reaching the electrical contacts and causing short circuits.
4Adaptability or versatility
If the battery pack is designed for specific tab orientations, then electrical connections are simplified, but adaptability to different battery chemistries and form factors is reduced
Solution Approach 1:
The receptacle system is designed with universal characteristics that allow it to accommodate different battery chemistries and form factors. The first receptacles can receive rigid tabs from various battery types, and the second receptacles are configured to receive flexible tabs from different battery configurations. This universal design allows the same battery pack housing to work with different battery modules without requiring changes to the receptacle structure.
Data Source
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AI summary
Disclosed is a battery pack. The battery pack includes a case configured to form an inner space and having a top plate and a side plate; a plurality of battery cells located inside the case; and a fastening member configured to penetrate the top plate and be inserted into the side plate, and the side plate has a drain hole that exposes the fastening member to the outside.