EV Battery Housing Structure for Two-Direction Pouch Cell Compression
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Solution Overview
Problem
Conventional battery designs for electric vehicles do not effectively compress battery cells, leading to suboptimal energy storage and potential expansion issues due to prestress in pouch cells.
Innovation Solution
A battery housing design featuring interconnected housing elements with adhesive bonding and U-shaped cross-sectional shapes allows for enhanced compression of battery cells in two directions, utilizing additional elements to ensure a secure and compact assembly, and incorporating curved side walls to mitigate expansion caused by prestress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional battery housing designs are used, then the structure is simple, but the battery cells cannot be effectively compressed
Solution Approach 1:
The housing is divided into multiple housing elements (first housing element, second housing element, third housing element) that can be separately assembled and connected. This segmentation allows the compression force to be applied effectively from multiple directions while maintaining manageable structural complexity through modular assembly
Solution Approach 2:
The housing elements are designed to overlap and nest within each other, with the first and second housing elements forming a U-shaped cross-section that can contain the third housing element. This nesting arrangement enables effective compression of battery cells while maintaining a compact overall structure
2Strength
If housing elements are connected with adhesive film, then the connection strength is improved, but the manufacturing process becomes more complex
Solution Approach 1:
Adhesive films are pre-applied to the housing elements before assembly, allowing the adhesive to partially cure and gain initial strength. This preliminary action ensures strong connections between housing elements while simplifying the final assembly process, as the adhesive is already in place rather than requiring complex joining operations during assembly
Solution Approach 2:
Adhesive films serve as an intermediary material between housing elements, providing a reliable bonding interface that distributes stresses and ensures strong connections. This intermediary approach simplifies the manufacturing process compared to mechanical fastening methods, as the adhesive film can be applied using standard coating techniques
3Quantity of substance
If pouch cells are compressed during assembly, then energy storage efficiency is improved, but expansion issues due to prestress occur
Solution Approach 1:
The housing elements are designed with different geometric properties to address local requirements: U-shaped cross-sections provide compression in two directions where needed, while curved side walls provide expansion resistance in specific areas. This local differentiation of structural properties enables effective compression for energy density while maintaining stability against prestress-induced expansion
Solution Approach 2:
Curved side walls are incorporated into the housing design to counteract the expansion forces generated by prestressed pouch cells. The curvature provides structural rigidity and resistance to the outward expansion pressure, maintaining the compressed state of the battery cells while preventing deformation or failure of the housing structure
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 design enables better compression and secure assembly of battery cells, improving energy storage efficiency and reducing expansion issues related to prestress, thereby enhancing the performance and reliability of electric vehicle batteries.
Implementation Method 1
an adhesive film can be arranged in the overlapping region between the two housing elements, via which adhesive film the housing elements are adhesively bonded to each other
Data Source
AI summary
A battery for a motor vehicle includes a plurality of battery cells and a housing. The battery cells are arranged within the housing and designed for storing energy and discharging electrical energy. The housing includes at least a first housing element and a second housing element. The first housing element and the second housing element are fixedly connected to each other. The first housing element and the second housing element each include a base surface and two lateral surfaces. The base surface is arranged between the lateral surfaces. A first distance by which the lateral surfaces extends away from the base surface is greater than a second distance by which the lateral surfaces are spaced apart from each other. The base surface and the lateral surfaces of the first housing element have the same dimensions as the base surface and the lateral surfaces of the second housing element.