Integrating Bus-Bar Fastening and Exhaust in Battery Modules
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Solution Overview
Problem
Existing battery modules face challenges in protecting circuit components from temperature and chemical influences during degassing situations, particularly due to the complexity of assembly and design limitations in integrating bus-bar and exhaust functions.
Innovation Solution
A battery module design where the bus-bar fastening and exhaust portions are integrally formed, allowing for a more compact structure and mounting of a circuit portion on the holder to prevent exposure to temperature and chemical influences during degassing, using a holder made of plastic compound material with projections to control gas exhaust and prevent direct leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate bus-bar fastening structure and exhaust structure are used, then assembly flexibility is improved, but device complexity increases
Solution Approach 1:
The holder integrates both the bus-bar fastening portion and exhaust portion into a single component. The bus-bar fastening portion includes clamping structures to secure bus-bars, while the exhaust portion contains exhaust openings aligned with battery cell vents. This merging eliminates the need for separate fastening and exhaust components, reducing assembly steps and overall device complexity while maintaining functional flexibility.
2Ease of manufacture
If circuit portion is mounted directly on battery cells, then mounting simplicity is improved, but reliability deteriorates due to temperature and chemical influence
Solution Approach 1:
The holder serves as an intermediary component between the battery cells and the circuit portion. It positions the circuit portion above the battery cells while maintaining electrical connections through the bus-bar fastening portion. The holder's structure, including the exhaust portion with exhaust openings, protects the circuit portion from direct exposure to temperature and chemical influences during battery operation, particularly during degassing events, while still allowing simplified mounting.
3Productivity
If exhaust openings are provided directly on battery cells, then gas exhaust efficiency is improved, but harmful factors increase due to direct chemical influence on surrounding components
Solution Approach 1:
The exhaust portion of the holder acts as an intermediary structure between the battery cell vents and the external environment. The exhaust openings are positioned to receive gas directly from the battery cell vents, maintaining efficient exhaust flow. However, the holder's body shields surrounding components, particularly the circuit portion, from direct contact with the chemically active degassed materials, thus reducing harmful chemical influence while preserving exhaust efficiency.
Data Source
AI summary
A battery module includes a plurality of battery cells, a holder, and a bus-bar. The plurality of battery cells are arranged along one direction, and each of the plurality of battery cells includes a terminal and a vent at an upper surface. The holder is on the plurality of battery cells and has an opening through which the terminal is exposed. The bus-bar is has a portion in the opening of the holder and electrically couples adjacent ones of the plurality of battery cells. The holder includes a bus-bar fastening portion at an area corresponding to the terminal and an exhaust portion at an area corresponding to the vent. The bus-bar fastening portion and the exhaust portion are integrally formed.