Sodium-Sulfur Battery Charge Discharge Condition Calculation
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Solution Overview
Problem
Calculating a charge/discharge condition for sodium-sulfur batteries in real-time is challenging due to the numerous factors involved, such as state of charge, temperature, and deterioration state, requiring extensive calculations and making it difficult to provide operators with timely assistance in operating electrical energy storage devices.
Innovation Solution
A device with a memory mechanism and calculation mechanism that uses a lookup table to store and interpolate charge/discharge conditions based on state indicators, reducing the number of calculations needed to determine an appropriate charge/discharge condition for secondary batteries of high-temperature operation types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If numerous calculations are performed to determine charge/discharge condition considering state of charge, temperature, and deterioration state, then accuracy of charge/discharge condition is improved, but calculation time and complexity increase
Solution Approach 1:
The patent pre-calculates and stores charge/discharge conditions for various combinations of state of charge, temperature, and deterioration state in a lookup table during the design phase. This preliminary action allows the system to retrieve pre-computed results during operation instead of performing complex real-time calculations, thereby maintaining high accuracy while significantly reducing calculation time.
Solution Approach 2:
The patent segments the continuous parameters (state of charge, temperature, deterioration state) into discrete levels and creates a multi-dimensional lookup table structure. By dividing the parameter space into manageable segments, the system can efficiently store and retrieve charge/discharge conditions without requiring complex real-time computations across the entire continuous parameter space.
2Reliability
If numerous calculations are performed to determine charge/discharge condition, then reliability of battery operation is improved, but device complexity increases
Solution Approach 1:
The patent creates a simplified copy of the complex charge/discharge condition calculation model in the form of a lookup table. Instead of implementing the full complex calculation model in real-time, the system stores pre-computed results that replicate the behavior of the complex model, thereby maintaining reliability while reducing the complexity of the real-time calculation mechanism.
3Reliability
If charge power is reduced in the neighborhood of the last stage of charge due to sharply increased internal resistance, then battery safety is improved, but productivity decreases
Solution Approach 1:
The patent dynamically adjusts charge power based on the state of charge, temperature, and deterioration state by retrieving appropriate conditions from the lookup table. This dynamic adjustment allows the system to reduce charge power only when necessary (near the last stage of charge or under high temperature conditions) while maintaining high charging speeds during favorable conditions, thereby balancing safety and productivity.
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
Enables the calculation of a charge/discharge condition for secondary batteries with a significantly reduced number of calculations, facilitating real-time decision-making and operator assistance in managing electrical energy storage devices.
Implementation Method 1
performs interpolation in the two or more selected state indicators and the two or more extracted charge/discharge conditions
Implementation Method 2
a cell reaction which is an exothermic reaction proceeds in a sodium-sulfur battery when a sodium-sulfur battery discharges
Implementation Method 3
a cell reaction which is an endothermic reaction proceeds in a sodium-sulfur battery when a sodium-sulfur battery is charged
Implementation Method 4
Joule heat is generated due to internal resistance in a sodium-sulfur battery when a sodium-sulfur battery discharges and is charged
Data Source
AI summary
A charge/discharge condition adoptable in a secondary battery of high-temperature operation type is calculated by a small amount of calculations. A resource matrix includes a plurality of state indicators and a plurality of charge/discharge conditions. The resource matrix is referred to and two or more state indicators related to an input state indicator so as to satisfy a condition are selected from the plurality of state indicators. A charge/discharge condition corresponding to each of the two or more selected state indicators are extracted from the plurality of charge/discharge conditions, so that two or more charge/discharge conditions are extracted. Interpolation is performed in the two or more selected state indicators and the two or more extracted charge/discharge conditions, so that a charge/discharge condition adoptable in a secondary battery in a case where a state of the secondary battery is indicated by the input state indicator, is calculated.