Deformable Battery Pressure Control for Uniform Cell Compression
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Solution Overview
Problem
Existing battery technologies face challenges in applying uniform pressure to electrochemical cells, particularly those with lithium metal electrodes, which can lead to dendrite formation and surface roughening, and managing pressure across multiple cells during cycling, resulting in uneven pressure distributions and potential safety hazards.
Innovation Solution
Incorporating a deformable solid, such as a piezoelectric array or electroactive polymer, that applies anisotropic forces normal to the electrode surface, allowing for dynamic pressure adjustments based on electrical potentials and sensor feedback to maintain uniform pressure distribution across electrochemical cells, even during dimensional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform pressure is applied to electrochemical cells with lithium metal electrodes, then dendrite formation and surface roughening are reduced, but device complexity increases due to the need for deformable solids and pressure control mechanisms
Solution Approach 1:
The patent changes the physical state and properties of the solid electrolyte interphase (SEI) layer by applying controlled pressure to transform it from a brittle, non-compliant layer to a more compliant, ductile layer that can accommodate volume changes during lithium deposition, thereby preventing dendrite formation without complex active control systems
Solution Approach 2:
The patent replaces complex active pressure control systems with passive mechanical pre-compression applied to the battery stack, using the structural framework and deformable solids to maintain uniform pressure distribution throughout cycling without requiring active sensors or actuators
2Stability of the object's composition
If pressure is applied to manage dimensional changes during cycling, then uniform pressure distribution is maintained, but the device complexity increases due to deformable solids and sensor feedback systems
Solution Approach 1:
The patent introduces deformable solids that can dynamically adjust their mechanical properties and geometry in response to applied pressure, allowing the battery structure to adapt to dimensional changes during cycling while maintaining uniform pressure distribution through passive mechanical compliance
Solution Approach 2:
The patent changes the mechanical compliance parameter of the battery structure by incorporating deformable solids that can alter their stiffness and shape under pressure, enabling the system to maintain stable pressure distribution without complex active control
3Reliability
If deformable solids are used to apply anisotropic forces, then performance and durability are enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses homogeneous deformable solid materials with uniform mechanical properties that can be consistently manufactured and integrated into the battery structure, ensuring reliable performance enhancement without requiring extreme manufacturing precision
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 approach enhances the performance and durability of electrochemical cells by reducing dendrite formation, improving current density, and maintaining consistent pressure across multiple cells, thereby extending battery lifespan and ensuring safety.
Implementation Method 1
the deformable solid includes a piezoelectric array
Implementation Method 2
the deformable solid includes a piezoelectric array and/or an electroactive polymer
Data Source
AI summary
Systems and methods for applying pressure to electrochemical devices are generally described. In some aspects, batteries including an electrochemical cell and an associated deformable solid are provided. The deformable solid may be configured to apply an anisotropic force (e.g., during cycling), which may improve the performance and/or durability of the electrochemical cell. In some instances (for example, in certain cases where the deformable solid includes a piezoelectric array and/or an electroactive polymer), the battery may be able to make dynamic adjustments to a pressure experienced by the electrochemical cell (e.g., based on signals from a pressure sensor). The systems and methods described herein can, in some instances, provide for relatively uniform pressure distributions across an electrochemical cell and/or throughout a stack of multiple electrochemical cells.