Battery Pack Exhaust Passage for Pouch Cell Expansion Venting
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Solution Overview
Problem
Pouch-type lithium batteries can experience cell expansion leading to safety hazards if not controlled, as they generate gas and expand in volume over time, potentially resulting in explosions.
Innovation Solution
A battery pack design that includes a cover plate, cell module, second resin layer, and battery pack housing, with an insulation assembly at the second ends of cells forming an exhaust passage to alleviate expansion and enhance safety, reducing the need for excessive resin and lowering costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second resin layer is used to fix the cell module, then the cell module is securely fixed in the battery pack housing, but the dosage of resin increases and cost increases
Solution Approach 1:
The fixing system is segmented into multiple components: the first resin layer for initial bonding, the insulation assembly with bonding structures for localized reinforcement, and the second resin layer for final securing. This segmentation allows each component to perform its specific function efficiently, reducing the need for excessive resin while maintaining reliable fixing.
Solution Approach 2:
The insulation assembly acts as an intermediary component between the cell module and the battery pack housing. It provides bonding structures that facilitate secure attachment without requiring large amounts of resin, as the insulation assembly itself contributes to the bonding interface.
2Ease of manufacture
If the cell expansion is not controlled, then the battery can be manufactured simply, but safety hazards occur during use
Solution Approach 1:
The exhaust passage is pre-configured within the insulation assembly before the battery is put into service. This preliminary arrangement of the exhaust pathway ensures that gas generated during battery operation can be safely discharged, preventing cell rupture and safety hazards without complicating the manufacturing process.
Solution Approach 2:
The gas generated by cell expansion, which is a harmful factor, is converted into a manageable byproduct through the exhaust passage. The insulation assembly's through-hole and exhaust passage structure enable safe gas discharge, transforming the potential safety hazard into a controlled process that maintains battery safety.
3Reliability
If the second end of the cell is constrained, then the cell is securely fixed, but the accuracy of detecting expansion degree decreases
Solution Approach 1:
The fixing arrangement applies local quality by securing the cell at specific locations (first end and intermediate positions) while leaving the second end relatively free. The insulation assembly provides localized bonding structures that fix the cell without completely constraining it, allowing expansion detection at the second end to remain accurate while maintaining overall fixing reliability.
Data Source
AI summary
A battery pack is disclosed, including a cover plate, a cell module, a second resin layer, a battery pack housing, and an insulation assembly. The cell module is accommodated in the battery pack housing and fixed by the second resin layer. The cell module includes a plurality of cells. Each of the cells includes a first end and a second end disposed opposite to each other along a first direction. The insulation assembly is disposed at second ends of at least two of the cells. The insulation assembly and the second ends of the at least two cells form a first space. The first space communicates with a clearance between the at least two cells. The insulation assembly closes off one side of the first space. The insulation assembly and the first space form an exhaust passage. The exhaust passage communicates with an outside of the battery pack.