Battery Pack Degassing Cover with Varying Rigidity
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Solution Overview
Problem
Battery packs used in vehicles generate harmful gases during charging and discharging, which can accumulate inside the vehicle, posing safety risks due to potential ignition or inhalation hazards.
Innovation Solution
A battery pack design featuring a degassing cover with varying rigidity, integrated with a bus bar cover and insulating member, allows for the controlled discharge of gases generated from battery cells, ensuring safe venting of harmful components outside the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid cover structure is used to protect battery cells, then structural strength and protection are improved, but harmful gases generated from battery cells cannot be effectively discharged, leading to gas accumulation and safety hazards
Solution Approach 1:
The cover structure is segmented into multiple functional zones: a rigid cover plate for structural strength, a flexible degassing cover for gas discharge, and a bus bar cover for electrical component protection. This segmentation allows each zone to perform its specific function optimally without compromising the overall structure.
Solution Approach 2:
Different regions of the cover structure have different rigidity properties. The cover plate maintains high rigidity for protection, while the degassing cover has lower rigidity to enable deformation and gas discharge. This local differentiation of material properties resolves the contradiction between overall structural strength and localized gas venting capability.
2Reliability
If a uniform rigid cover is used over battery cells, then protection is improved, but the complexity of the cover structure increases when adding degassing functionality
Solution Approach 1:
The degassing cover and bus bar cover are integrally formed as a single piece, combining multiple protective and functional elements into one component. This merging reduces the number of separate parts and assembly steps while maintaining comprehensive protection and degassing functionality.
Solution Approach 2:
The integrated cover structure serves multiple functions simultaneously: protecting battery cells and electrical components, enabling gas discharge, and providing structural support. This multi-functionality reduces the need for separate components, thereby simplifying the overall structure while improving reliability.
3Stability of the object's composition
If the degassing cover has high rigidity, then structural stability is improved, but the cavity cannot effectively receive and discharge harmful gases from battery vents
Solution Approach 1:
The degassing cover is designed with locally reduced rigidity in specific areas to create a deformable cavity that can expand to receive discharged gases. This local flexibility is confined to the gas reception zone, while the overall cover structure maintains sufficient stability through its integral connection to the rigid cover plate and bus bar cover.
Data Source
AI summary
A battery pack including at least one battery module including: a plurality of battery cells arranged in a direction, each of the battery cells including a vent; and a cover covering the plurality of battery cells and including a degassing cover covering the vents; and a cover plate on the degassing cover, at least a portion of the degassing cover having a rigidity less than a rigidity of the cover plate.