Battery Cell Stack Removal Strap for Compressed Pack Assemblies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for removing battery cells from a traction battery pack assembly, particularly those with enclosure structures that compress the cells, are inefficient and lack effective mechanisms for easy extraction and replacement.
Innovation Solution
A method involving the use of a cell stack removal strap that is sandwiched between the cell stack and the enclosure structure, allowing for the cell stack to be compressed and then pulled out perpendicular to its axis, facilitated by manufacturing equipment, with options for basket-configured straps for enhanced stability and force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If battery cells are compressed within an enclosure structure for stable operation, then structural stability and thermal management are improved, but cell removal and replacement become difficult and time-consuming
Solution Approach 1:
The invention introduces a removable strap as a separate component that segments the compression system from the battery cell. The strap can be independently removed without disturbing the enclosure structure, allowing cell extraction while maintaining structural stability during operation.
Solution Approach 2:
The strap is pre-installed around the battery cell before compression begins. This preliminary placement allows the compression force to be applied through the strap, and the same strap to later serve as the extraction mechanism, eliminating the need for separate removal tools or procedures.
2Quantity of substance
If battery cells are tightly compressed in the enclosure for efficient space utilization, then energy density is improved, but extraction and replacement operations become complex and time-consuming
Solution Approach 1:
The invention extracts the removal function from the compression structure itself and assigns it to a dedicated strap component. This allows the cell to be pulled out horizontally through the enclosure opening without requiring disassembly of the compression system or damage to the enclosure structure.
Solution Approach 2:
The strap serves as an intermediary component between the enclosure structure and the battery cell. It transmits compression force during operation and later serves as the extraction mechanism, enabling time-efficient removal without compromising the tight compression or structural integrity.
3Device complexity
If a simple compression structure is used for battery cells, then device complexity is reduced, but effective extraction mechanisms are lacking
Solution Approach 1:
The strap performs multiple functions: it applies compression force to the battery cell during operation, maintains structural integrity, and serves as the extraction mechanism during replacement. This multi-functionality eliminates the need for separate compression and extraction mechanisms, reducing overall device complexity while enabling effective cell removal.
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
Enables efficient and stable removal of battery cell stacks from the enclosure, facilitating service or replacement, while maintaining structural integrity and potentially enhancing thermal management through strap design.
Implementation Method 1
compressing a cell stack with an enclosure structure when the cell stack is received within a cell-receiving opening of the enclosure structure
Implementation Method 2
pulling a cell stack removal strap to withdrawn the cell stack from the cell-receiving opening of the enclosure structure
Data Source
AI summary
A battery pack cell stack removal method includes compressing a cell stack with an enclosure structure when the cell stack is received within a cell-receiving opening of the enclosure structure, and pulling a cell stack removal strap to withdrawn the cell stack from the cell-receiving opening of the enclosure structure.