Hybrid Battery Cell Enclosure With Venting and Rigid Support
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Solution Overview
Problem
Pouch cells in battery enclosures are prone to swelling due to gassing and lack a designated vent, requiring a support structure and posing risks near sharp edges, while traditional enclosures do not optimize space utilization and thermal management.
Innovation Solution
A hybrid battery cell enclosure featuring an aluminum alloy metal sheet bonded to a multi-layer aluminum laminate film, with a sealed cavity and a vent mechanism to manage pressure and temperature fluctuations, incorporating flange portions for support and a vent segment for gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a pouch cell uses a sealed flexible foil enclosure, then weight is reduced and flexibility is improved, but the cell swells due to gassing and lacks structural support
Solution Approach 1:
The patent applies composite materials by bonding an aluminum alloy metal sheet to a multi-layer aluminum laminate film. The metal sheet provides rigid structural support while the laminate film maintains flexibility and light weight. This composite construction resolves the contradiction by combining materials with complementary properties - the metal provides strength and the film provides flexibility and weight efficiency.
2Weight of moving object
If a pouch cell uses a sealed flexible foil enclosure, then the cell is lightweight, but it cannot provide a designated vent for gas release
Solution Approach 1:
The patent applies segmentation by creating a hybrid enclosure with distinct functional zones - a sealed portion for containment and a vent segment for gas release. The aluminum alloy metal sheet includes a vent segment that allows controlled gas release while the rest of the enclosure remains sealed. This segmented approach enables the lightweight enclosure to simultaneously provide both sealing and venting capabilities.
3Volume of moving object
If a pouch cell lacks rigid enclosure, then space utilization is improved, but the cell requires external support structure and cannot withstand sharp edges
Solution Approach 1:
The patent applies local quality by providing rigid protection only where needed - the aluminum alloy metal sheet provides structural support and protection against sharp edges at critical locations, while the multi-layer laminate film maintains flexibility in other areas for space utilization. This localized application of rigidity resolves the contradiction by providing protection where required without compromising overall flexibility and space efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid enclosure provides a flexible, lightweight structure with rigid support, allowing for efficient space utilization and safe gas release, enhancing battery performance and safety.
Implementation Method 1
the inner layer of the multi-layer aluminum laminate film is at least one of heat-sealed to the aluminum alloy metal sheet around the perimeter of the hybrid battery cell enclosure
Implementation Method 2
bonded to the aluminum alloy metal sheet around the perimeter of the hybrid battery cell enclosure by grafting of a triazine molecular layer therebetween
Data Source
AI summary
A battery cell including an anode layer, a cathode layer and a separator positioned between the anode layer and the cathode layer, the anode layer, the cathode layer and the separator positioned within a hybrid battery cell enclosure having an aluminum alloy metal sheet and a multi-layer aluminum laminate film, wherein, the multi-layer aluminum laminate film and the aluminum alloy metal sheet are bonded to one another around a perimeter of the hybrid battery cell enclosure defining a sealed cavity between the multi-layer aluminum laminate film and the aluminum alloy metal sheet and within the perimeter of the hybrid battery cell, the anode layer, the cathode layer, and the separator positioned within the sealed cavity.