Bent Tab Couplings for Pouch Cells With Robust Current Collection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery cells, particularly prismatic cells, face challenges with mechanical robustness, thermal management, and ease of maintenance due to mechanical stress, overheating, and complex electrical coupling, which can lead to internal damage and reduced reliability.
Innovation Solution
Incorporation of a center post for mechanical support, a cooling configuration with coolant lines, a thermally conductive potting material for thermal management, a removable side for ease of maintenance, and innovative electrical coupling methods, including stacked electrical conductors and bent tab couplings, to enhance mechanical stability, thermal efficiency, and maintainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a center post is added for mechanical support, then mechanical robustness is improved, but device complexity increases
Solution Approach 1:
The battery cell structure is divided into segments with the center post acting as a separate structural element that divides the internal space. This segmentation provides mechanical support while maintaining manufacturability through modular assembly of the post with end plates and rod components.
Solution Approach 2:
The center post serves multiple functions simultaneously: it provides mechanical support to prevent swelling, acts as a structural anchor for the cooling configuration, and serves as a mounting point for electrical coupling components. This multi-functionality reduces the need for additional separate components.
2Temperature
If cooling configuration is added for thermal management, then temperature control is improved, but device complexity increases
Solution Approach 1:
The cooling configuration is merged with the center post structure, where coolant lines are integrated into the post assembly. This combining of cooling functionality with the existing mechanical support structure avoids adding separate cooling components and reduces overall device complexity.
Solution Approach 2:
Thermally conductive potting material is used as an intermediary substance that transfers heat from the energy units to the cooling structure. This material facilitates thermal management by conducting heat away from critical components without requiring direct thermal contact between all parts.
3Ease of manufacture
If electrical coupling methods are simplified, then ease of manufacture is improved, but reliability may worsen
Solution Approach 1:
Tabs are pre-bent to the required configuration before final assembly, and electrical conductors are pre-positioned and secured within the housing. This preliminary preparation of electrical components simplifies the final assembly process while ensuring proper alignment and secure connections that maintain reliability.
Solution Approach 2:
The bent tab couplings are designed to self-align and self-secure within the housing structure, where the bending action itself creates the electrical connection without requiring additional fastening operations. This self-service mechanism simplifies manufacturing while ensuring reliable electrical contact through the mechanical deformation of the tabs.
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 solutions provide enhanced mechanical protection, improved thermal management, and simplified maintenance, leading to increased reliability and efficiency of battery cells, suitable for various energy applications.
Implementation Method 1
a thermally conductive potting material for mechanical and thermal support of the battery cells
Data Source
AI summary
In accordance with some embodiments of the present disclosure, an apparatus includes a plurality of pouch energy units comprising a plurality of electrical tabs, each having bent end, and a current collector arranged across the plurality of pouch energy units. The current collector comprises a plurality of tines extending behind the bent ends; and each bent end is electrically coupled to a corresponding tine. In some embodiments, the plurality of electrical tabs each comprise a first end portion extending outward from a respective pouch energy unit and a second end portion comprising the bent end, and the bent end is approximately perpendicular to the first end portion. In some embodiments, the plurality of electrical tabs each comprises a middle portion between the first end portion and the second end portion, and the middle portion comprises a curve or one or more bends.