Battery Pack Frame With Elastic Cell Stack Support for Swelling Control
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Solution Overview
Problem
Conventional pouch-type secondary battery packs face limitations in maximizing energy density and component simplification due to the need for separate fastening members and buffer pads to prevent cell swelling, which restricts the number of battery cells that can be mounted in a single module.
Innovation Solution
A battery pack design featuring a pack frame with integrated elastic support portions and a module fixing mechanism that presses the cell stack, eliminating the need for additional fastening members and minimizing buffer pads, allowing for a higher cell density by stabilizing the cell stack through elastic support and buffer units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fastening members (bolts) are used to fix battery modules to the battery pack, then the battery module is securely fixed, but the fastening space is increased and device complexity is worsened
Solution Approach 1:
The patent merges the fastening function into the battery pack case itself by forming protrusions that directly engage with recesses in the battery module housing. This eliminates the need for separate fastening members (bolts, screws, clips) while maintaining secure fixation. The case structure itself becomes the fastening mechanism, reducing component count and simplifying the overall assembly.
Solution Approach 2:
The battery pack case serves multiple functions: it provides structural enclosure, thermal management pathways, and mechanical fastening through its integrated protrusions. This multi-functionality eliminates the need for dedicated fastening components, reducing device complexity while maintaining reliable fixation of battery modules.
2Reliability
If multiple buffer pads are placed on battery cells to prevent swelling, then cell swelling is prevented, but the number of mountable battery cells in one module is reduced
Solution Approach 1:
The patent extracts the swelling prevention function from multiple distributed buffer pads and concentrates it into a single buffer member positioned at the rear of the battery module. This single buffer member engages with the protrusions on the case to provide uniform support and prevent cell swelling across all cells, thereby maximizing the number of cells that can be mounted in each module.
Solution Approach 2:
The single buffer member performs the swelling prevention function for all battery cells in the module simultaneously, rather than requiring individual buffer pads for each cell. This universal approach maintains reliability while maximizing cell density in the module.
3Quantity of substance
If more battery cells are mounted in one module, then energy density is maximized, but the space for buffer pads and fastening members is reduced
Solution Approach 1:
By merging the fastening function into the case structure itself through integrated protrusions, the patent eliminates the space that would otherwise be required for separate fastening members. This frees up volume that can be used to accommodate additional battery cells, thereby maximizing energy density.
Solution Approach 2:
The patent extracts the buffering function from multiple space-consuming buffer pads and consolidates it into a single compact buffer member at the module rear. This space extraction allows for increased cell density while maintaining adequate swelling prevention capability.
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
This design enables a simpler structure for mounting more battery cells in a single module, maximizing energy density while effectively suppressing cell swelling with reduced buffer pads, thus enhancing the overall efficiency and capacity of the battery pack.
Implementation Method 1
an elastic support portion coupled to the pack frame in a front-rear direction of the cell stack to press one or more of front and rear surfaces of the cell stack
Data Source
AI summary
A battery pack according to the present disclosure includes a pack frame; and at least one battery module provided inside the pack frame and including a cell stack and an elastic support portion coupled to the pack frame in a front-rear direction of the cell stack to press one or more of front and rear surfaces of the cell stack.