Secondary Battery State Detection Using Exponential Function Fitting
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Solution Overview
Problem
Existing secondary battery state detection methods cause battery capacity deterioration and require high-cost processing capabilities due to frequent pulse discharges and complex Fourier transformations.
Innovation Solution
A secondary battery state detecting device that performs pulse discharges, acquires voltage variations, and calculates parameters using exponential functions to reduce capacity deterioration and processing costs, allowing for accurate state detection based on resistance and capacity values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pulse discharges are executed to detect battery state, then detection accuracy is improved, but battery capacity deterioration increases
Solution Approach 1:
The patent applies partial action by executing only one pulse discharge instead of multiple discharges. The single pulse discharge with exponential function fitting provides sufficient detection accuracy while minimizing battery stress and capacity deterioration that would result from repeated discharge cycles.
Solution Approach 2:
The patent replaces the mechanical/electrical system of multiple physical discharge cycles with a mathematical processing system. By using exponential function fitting on voltage data from a single pulse discharge, the system achieves accurate battery state detection without the harmful effects of repeated mechanical discharging.
2Measurement precision
If Fourier transformation processing is used to analyze battery impedance, then detection accuracy is improved, but arithmetic cost and processing complexity increase
Solution Approach 1:
The patent extracts only the essential information needed for battery state detection from the impedance data. Instead of performing full Fourier transformation to obtain the complete impedance spectrum, the system extracts relevant parameters through exponential function fitting, eliminating unnecessary computational complexity while retaining detection accuracy.
Solution Approach 2:
The patent replaces the computationally expensive and complex Fourier transformation process with a simpler, lower-cost mathematical approach. The exponential function fitting requires minimal processing power and can be implemented on inexpensive hardware, making the system more accessible and cost-effective.
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 solution effectively decreases battery capacity deterioration and reduces arithmetic costs by using exponential function fitting and lower processing loads, enabling accurate state detection with less complex calculations.
Implementation Method 1
a secondary battery is subjected to a pulse discharge with a constant current
Implementation Method 2
calculating means for calculating a parameter of a predetermined function having time as a variable by fitting the variation of a voltage value acquired by the acquiring means using the predetermined function
Data Source
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AI summary
To provide a secondary battery state detecting device that decreases the deterioration in capacity of the secondary battery and is low in arithmetic cost. A secondary battery state detecting device that detects a state of a secondary battery includes discharge means (discharge circuit (15)) for subjecting the secondary battery (14) to a pulse discharge, acquiring means (controller (10)) for controlling the discharge means to subject the secondary battery to at least one pulse discharge, and acquiring a time variation of a voltage value at that time, calculating means (controller (10)) for calculating a parameter of a predetermined function having time as a variable by fitting the variation of the voltage value acquired by the acquiring means using the predetermined function, and detecting means (controller (10)) for detecting the state of the secondary battery on the basis of the parameter of the predetermined function calculated by the calculating means.