Elastic Pressing Plate Battery Module for Pouch Cell Swelling
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Solution Overview
Problem
Lithium-polymer pouch-type secondary battery cells experience swelling due to electrode expansion and gas generation, leading to reduced structural stability and energy density in battery modules, with existing solutions like compression pads and straps being inefficient or increasing component complexity.
Innovation Solution
A battery module design featuring a module housing with elastic pressing plates that compress pouch-type battery cells without external components, maintaining a pressurized state during assembly to minimize swelling and enhance energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If compression pads are inserted between secondary battery cells to suppress swelling, then the swelling phenomenon is reduced, but the space for accommodating battery cells is reduced and energy density per unit volume decreases
Solution Approach 1:
The pressing plates are integrated into the module housing structure itself, merging the compression function with the housing. This eliminates the need for separate compression pads between cells, as the housing directly provides the compressive force through its pressing plates that extend into the cell assembly.
Solution Approach 2:
The compression function is extracted from separate components (compression pads) and transferred to the module housing structure. The pressing plates are formed as integral parts of the housing, removing the need for additional compression components that would occupy valuable space.
2Stability of the object's composition
If straps are used to tighten the battery module to apply compression pressure, then the swelling phenomenon is suppressed, but the pressure is applied irregularly and the assembling process becomes more complex with increased components
Solution Approach 1:
The compression function is merged into the module housing structure through integrated pressing plates. This eliminates the need for separate straps and compression components, simplifying the overall assembly structure and reducing the number of parts required.
Solution Approach 2:
The module housing serves multiple functions: it provides structural containment for the cell assembly and simultaneously applies compression pressure through its integrated pressing plates. This multi-functionality eliminates the need for separate compression components and simplifies the overall design.
3Stability of the object's composition
If straps are used to tighten the battery module, then compression pressure is applied to suppress swelling, but additional assembly steps and components are required
Solution Approach 1:
The compression function is merged into the module housing structure through integrated pressing plates. This eliminates the need for separate straps and compression components, simplifying the overall assembly structure and reducing the number of parts required.
Solution Approach 2:
The module housing serves multiple functions: it provides structural containment for the cell assembly and simultaneously applies compression pressure through its integrated pressing plates. This multi-functionality eliminates the need for separate compression components and simplifies the overall design.
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 solution effectively suppresses volume expansion during charging and discharging, reduces manufacturing costs, and simplifies the assembly process by eliminating the need for separate compression components, while maintaining structural integrity and improving energy density.
Implementation Method 1
a first left pressing plate and a first right pressing plate having elasticity and extending upwards at both side edge regions of the lower plate
Implementation Method 2
the first left pressing plate and the first right pressing plate are elastically biased to press both side surfaces of the cell stack
Data Source
AI summary
A battery module includes a cell stack having pouch-type battery cells provided to stand side by side and stacked in a horizontal direction, and a module housing configured to accommodate the cell stack. The module housing includes a lower plate provided in a rectangular plate form to support the cell stack at a lower portion of the cell stack; and a first left pressing plate and a first right pressing plate having elasticity and extending upwards at both side edge regions of the lower plate, which are provided side by side, to form an acute angle with respect to a vertically upper direction so that a gap between the first left pressing plate and the first right pressing plate becomes narrowed upwards. The first left pressing plate and the first right pressing plate are elastically biased to press both side surfaces of the cell stack.