Solid-State Battery Pressure Control for Interface Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid-state batteries face safety issues due to potential explosion and ignition from overcharging or temperature increases, and they suffer from high interfacial resistance that reduces ion conductivity and accelerates degradation, requiring a uniform pressurizing force to maintain interface integrity without causing damage.
Innovation Solution
A battery system with a pressurizing device that adjusts force based on surface pressure measurements using a load cell, comprising a pressurizing unit and servo-injector to supply or recollect operation fluid, ensuring constant pressure application to the battery module, thereby maintaining optimal interfacial resistance and preventing interface breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressing force is applied to reduce interfacial resistance, then ion conductivity is improved, but the battery interface may be destroyed and module structure damaged
Solution Approach 1:
The pressing force is made dynamic rather than static. The pressing device adjusts the pressing force in real-time based on battery state (charge level, temperature, swelling) to maintain optimal interfacial contact without exceeding damage thresholds. This resolves the contradiction by transitioning from a fixed high-pressure approach to an adaptive pressure control system.
Solution Approach 2:
The pressing force parameter is changed and optimized based on operating conditions. Different pressing forces are applied during charging, discharging, and idle states, and adjustments are made according to temperature and battery swelling. This parameter optimization allows maintaining good interfacial contact while preventing interface destruction.
2Reliability
If high pressing force is applied to maintain interface contact, then interfacial resistance is reduced, but excessive pressure damages the module and pack structure
Solution Approach 1:
A feedback control system is implemented where sensors monitor battery parameters (pressure, temperature, charge state) and the pressing device adjusts force accordingly. The system receives feedback from the battery state and modulates pressing force to maintain optimal contact without causing structural damage, resolving the contradiction through closed-loop control.
Solution Approach 2:
The pressing force adapts dynamically to battery swelling and charging state. As the battery expands during charging, the pressing device reduces force to avoid damage; during discharging when the battery contracts, pressing force is increased to maintain contact. This dynamic adaptation prevents both poor contact and structural damage.
3Stability of the object's composition
If uniform pressurizing force is applied to the battery module, then interface integrity is maintained, but the system complexity increases due to pressure distribution requirements
Solution Approach 1:
The pressing device is divided into multiple independent pressing units that can be individually controlled. Each unit applies pressure to a specific region of the battery module, allowing uniform overall pressure distribution while maintaining simple individual unit structures. This segmentation resolves the contradiction by distributing complexity across multiple simple components.
Solution Approach 2:
The pressing device structure is designed to serve multiple functions: applying uniform pressure, accommodating battery swelling, providing thermal management contact, and enabling modular assembly. This multi-functionality reduces overall system complexity by combining what would otherwise require separate systems into a single integrated device.
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 maintains optimal interfacial resistance and prevents interface breakage, ensuring stable battery performance and safety by adjusting pressurizing force according to surface pressure, thus addressing safety and performance issues in solid-state batteries.
Implementation Method 1
a load cell for measuring a surface pressure of the battery module
Implementation Method 2
a pressurizing device configured to adjust a pressurizing force applied to the battery module through an operation fluid flowing through a fluid line
Data Source
AI summary
A battery system may include a battery module including at least one battery cell, a load cell configured for measuring a surface pressure of the battery module, and a pressurizing device configured to adjust a pressurizing force applied to the battery module through an operation fluid flowing through a fluid line based on the surface pressure of the battery module measured by the load cell.