Busbar Assembly Structure for Variable Cell Stack Compression
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Solution Overview
Problem
Existing electrical cell modules face issues with inconsistent stack lengths and terminal variations, leading to poor fit, increased manufacturing costs, and potential cell damage due to variable compression, as well as unreliable busbar connections.
Innovation Solution
A busbar assembly with a frame member and deformable busbar elements that accommodate varying stack lengths and terminal positions, ensuring consistent connection and compression across multiple cell stacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cell stacks are compressed to a fixed stack length to ensure accurate fit within the electrical cell module, then the fit accuracy is improved, but the compression force on cells becomes inconsistent leading to cell damage or suboptimal performance
Solution Approach 1:
The patent introduces a dynamic compression system where the compression force is applied at the module level rather than at the individual cell stack level. This allows the system to adapt to variations in cell thickness while maintaining consistent compression across all cells through a shared compression mechanism that distributes force uniformly.
Solution Approach 2:
The patent segments the compression function by separating the stack length accommodation from the compression force application. The frame structure accommodates length variations while the compression mechanism applies force independently, allowing each function to be optimized separately without compromising the other.
2Adaptability or versatility
If compressible spacers are used between cells to accommodate thickness tolerances, then the fit within the module is improved, but the variable compression creates inconsistent forces on cells increasing damage risk
Solution Approach 1:
The patent introduces a frame structure as an intermediary between the cell stacks and the compression mechanism. This frame acts as a mediator that distributes compression forces uniformly across all cell stacks, preventing localized over-compression while still accommodating thickness variations through the flexible frame design.
3Manufacturing precision
If cell grading is performed to pair minimum and maximum thickness cells, then the stack length consistency is improved, but manufacturing time and costs increase
Solution Approach 1:
The patent changes the approach from pre-sorting cells by thickness to a post-assembly solution where the frame structure accommodates thickness variations. This parameter change eliminates the need for time-consuming grading operations while maintaining stack length consistency through the flexible frame design.
4Adaptability or versatility
If the frame member distorts to adapt to dimensional tolerances, then the accommodation of variations is improved, but the busbar assembly reliability deteriorates
Solution Approach 1:
The patent segments the adaptation function by separating the frame's length accommodation capability from the busbar connection stability. The frame absorbs dimensional variations through its flexible design, while the busbar assembly maintains stable connections through dedicated mounting structures that are isolated from the frame's deformation.
Data Source
AI summary
A busbar assembly for an electrical cell module is disclosed having a pair of opposing module end plates supporting an adjacent pair of cell stacks. The assembly includes a frame member having first and second engaging means to cooperatingly mount the busbar assembly, in an assembled position, to the module end plates, and a receiving portion having a series of apertures, extending between upper and lower faces. The assembly includes a plurality of busbar elements, each having a first surface and an opposing second surface, wherein each aperture of the receiving portion receivingly engages at least one busbar element with its first surface oriented towards the lower face. Each aperture includes a support portion and a retaining protrusion to cooperatingly restrict relative movement of the busbar elements between the upper lower faces of the receiving portion as the assembly is mounted to the electrical cell module in the assembled position.