Electrochemical Storage Voltage Adaptation for Temperature Stability
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Solution Overview
Problem
High-performance electrochemical storage devices, such as supercapacitors and lithium-ion batteries, face limitations in operating temperature ranges, leading to electrolyte decomposition, reduced performance, and short lifetimes due to temperature-induced changes in power density and internal resistance.
Innovation Solution
A method that monitors temperature and adapts the voltage supplied by the device to counter changes in power density, maintaining constant power delivery across varying temperatures by adjusting the voltage window, either by increasing it at low temperatures or decreasing it at high temperatures, using the formula P=U^2/4Ri to calculate optimal voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the voltage is increased to maintain constant power density at high temperatures, then the power delivery is maintained, but the electrolyte decomposition accelerates and device lifetime decreases
Solution Approach 1:
The patent implements dynamic voltage adjustment based on real-time temperature monitoring. The control unit continuously adapts the voltage window according to the measured temperature, transitioning from static to dynamic operation. This resolves the contradiction by allowing high voltage at low temperatures for maximum power while reducing voltage at high temperatures to prevent electrolyte decomposition, thus maintaining both power delivery and device lifetime.
Solution Approach 2:
The patent changes the operating voltage parameter as a function of temperature. By establishing a temperature-dependent voltage window (e.g., 2.7V at low temperature, reduced to 2.3V at high temperature), the system optimizes power density while preventing harmful electrolyte decomposition at elevated temperatures, thereby resolving the power-lifetime trade-off.
2Reliability
If the voltage is decreased to prevent electrolyte decomposition at high temperatures, then the device lifetime is extended, but the power density decreases
Solution Approach 1:
The system dynamically adjusts voltage based on temperature conditions. During low-temperature operation, the full voltage window is utilized to maximize power density. During high-temperature operation, the voltage window is dynamically reduced to prevent electrolyte decomposition. This dynamic adaptation resolves the contradiction by providing high power when safe and protecting the device when necessary.
Solution Approach 2:
The control unit proactively reduces the voltage window before thermal runaway or severe electrolyte decomposition can occur. By monitoring temperature and preemptively adjusting voltage downward at high temperatures, the system prevents harmful effects while minimizing power loss, thus resolving the contradiction between lifetime extension and power maintenance.
3Adaptability or versatility
If the operating temperature range is expanded, then the application versatility is improved, but the electrolyte stability deteriorates due to decomposition at extreme temperatures
Solution Approach 1:
The patent implements dynamic voltage window adjustment that adapts to the actual temperature conditions. The control unit continuously monitors temperature and adjusts the maximum allowable voltage accordingly, enabling safe operation across an expanded temperature range from -40°C to +85°C while maintaining electrolyte stability through real-time parameter adaptation.
Solution Approach 2:
The system changes the operating voltage parameter as a function of temperature to maintain electrolyte stability across extreme temperature ranges. By establishing temperature-dependent voltage limits (higher voltage permitted at low temperatures, lower voltage at high temperatures), the patent enables broad temperature adaptability while preventing electrolyte decomposition, thus resolving the versatility-stability contradiction.
4Power
If the voltage window is increased to maximize power density, then the power delivery is improved, but the temperature-induced secondary reactions intensify causing electrolyte decomposition
Solution Approach 1:
The patent dynamically adjusts the voltage window size based on real-time temperature measurements. At low temperatures, the full voltage window is utilized to maximize power density. At high temperatures, the voltage window is dynamically reduced to prevent secondary reactions and electrolyte decomposition. This dynamic adaptation resolves the contradiction between maximizing power and preventing harmful effects.
Solution Approach 2:
The control unit implements feedback control by continuously monitoring temperature and adjusting the voltage window accordingly. The temperature measurement feeds back to the control algorithm, which then optimizes the voltage window to maximize power density while staying below the threshold for electrolyte decomposition, thus resolving the power-harmful effects contradiction.
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 enables high-performance electrochemical storage devices to maintain consistent power output and extend their service life across extreme temperatures, broadening their application fields by compensating for temperature-related power density changes and electrolyte degradation.
Implementation Method 1
electrochemical storage device to supply a voltage for a load
Implementation Method 2
monitoring the temperature of the high-performance electrochemical storage device
Implementation Method 3
adapting the voltage supplied by the high-performance electrochemical storage device as a function of a change in the monitored temperature thereof in a way that counters a change in the value of the power density
Data Source
AI summary
A method and system for adapting the voltage supplied by a high performance electrochemical storage device provide for: supplying a voltage for a load using a high-performance electrochemical storage device; monitoring the temperature of the high-performance electrochemical storage device; an adapting the voltage supplied by the high-performance electrochemical storage device as a function of a change in the monitored temperature thereof in a way that counters a change in the value of the power density of the high-performance electrochemical storage device attributable to the temperature change.