Pouch Cell Pressure Plate Linkage for Non-Uniform Expansion Control
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Solution Overview
Problem
Battery pouch cells in electric and hybrid vehicles experience pressure changes due to charging, discharging, and aging, which can impair charging and power storage capabilities.
Innovation Solution
A pressure management system comprising a pressure plate, a tilting assembly, a mechanical linkage, and a biasing system that adjusts to maintain constant pressure by translating expansion forces into reactive forces and balancing internal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple pressure plate is used to counteract battery cell expansion, then the structure is simple, but it cannot balance non-uniform expansion forces resulting in poor pressure control
Solution Approach 1:
The pressure management system divides the single pressure plate into multiple independent pressure plates, each equipped with its own mechanical linkage and biasing system. This segmentation allows each pressure plate to independently manage expansion forces at different locations, enabling effective control of non-uniform expansion while maintaining relatively simple individual components.
Solution Approach 2:
The mechanical linkage connects the pressure plate to a biasing system (spring), creating a dynamic force balance mechanism. The linkage translates and transmits forces between the expanding battery cell, the pressure plate, and the biasing system, allowing the system to adapt to varying expansion forces while maintaining controlled pressure.
2Device complexity
If the pressure plate is fixed in orientation, then the structure is simple, but it cannot adapt to non-uniform expansion forces
Solution Approach 1:
The pressure plate is made movable relative to the battery cell through the mechanical linkage system. This dynamic configuration allows the pressure plate to adjust its position and orientation in response to non-uniform expansion forces, with each pressure plate independently adapting to local expansion conditions while maintaining overall system simplicity.
3Reliability
If mechanical linkages translate expansion forces to reactive forces, then pressure control is improved, but the system complexity increases
Solution Approach 1:
The system uses multiple independent pressure management units, each consisting of a pressure plate, mechanical linkage, and biasing system. This segmentation distributes the complexity across multiple simple, identical modules rather than requiring a single complex centralized system, making the overall system more manageable and maintainable.
Solution Approach 2:
The mechanical linkage with biasing system automatically translates expansion forces into reactive forces without requiring external control systems. The system self-regulates pressure by utilizing the physical principles of force transmission and spring mechanics, eliminating the need for complex electronic controls or external intervention.
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 system effectively maintains constant pressure on battery cells, preventing damage from pressure fluctuations and ensuring consistent performance over the battery's lifetime.
Implementation Method 1
a biasing system including a biasing member configured to resist a lateral movement of the mechanical linkage. The biasing system is configured to apply a biasing force in a direction opposite a direction of the lateral movement, the biasing force causing the mechanical linkage to apply the reactive force as a selected proportion of the expansion force
Implementation Method 2
a mechanical linkage attached to the pressure plate, the mechanical linkage configured to move laterally in response to the expansion force and translate the expansion force to a reactive force that is opposed to the expansion force
Implementation Method 3
As such cells charge and discharge, and as such cells age, the pressure can change... expansion of the battery cell causes an expansion force to be applied to the pressure plate
Data Source
AI summary
A pressure management system includes a pressure plate configured to be disposed at an initial position relative to a battery cell in a housing, the initial position including a first orientation, a tilting assembly configured to allow the pressure plate to change from a first orientation to a second orientation based on the expansion force being non-uniform. The system includes a mechanical linkage attached to the pressure plate and configured to move laterally in response to the expansion force and translate the expansion force to a reactive force, and a biasing system including a biasing member configured to resist a lateral movement of the mechanical linkage. The biasing system is configured to apply a biasing force that causes the mechanical linkage to apply the reactive force, and based on the expansion force being non-uniform, is controllable to change the biasing force to balance an internal pressure of the cell.