Primary Battery Cell Life Estimation Using Current and Temperature
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Solution Overview
Problem
Existing methods for determining the remaining life of lithium thionyl chloride electrochemical cells are inaccurate and do not account for specific application conditions, leading to false estimates or premature battery replacement.
Innovation Solution
A method for real-time determination of electrochemical cell service life that measures current and temperature, taking into account application-specific factors such as maximum and average current, cut-off voltage, background current, and temperature, using formulas and tables to calculate availability time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If voltage measurement and characteristic curve analysis are used to determine remaining life, then the method is simple to implement, but the accuracy is poor because no-load voltage is constant throughout battery life
Solution Approach 1:
The patent transitions from measuring voltage (which remains constant) to measuring temperature (which varies with usage conditions). By using temperature measurements combined with application-specific parameters like background current and self-discharge current, the method achieves accurate remaining life determination while maintaining operational simplicity through a straightforward calculation formula.
2Measurement precision
If fast data acquisition and precise state of passivation estimation are used, then the accuracy improves, but the device complexity and difficulty of implementation increase
Solution Approach 1:
The patent extracts the essential measurement requirement from complex voltage-response analysis and isolates it to a single temperature measurement. By removing the need for fast data acquisition and complex state of passivation estimation, the method achieves sufficient accuracy without the associated complexity, using only a temperature sensor and simple calculation.
Solution Approach 2:
The patent replaces expensive and complex measurement systems with a simple, low-cost temperature sensor and straightforward calculation formula. This approach uses minimal hardware (temperature sensor only) and computational resources while providing accurate remaining life determination, making the solution practical for widespread application.
3Ease of operation
If theoretical usage profiles are used for capacity calculation, then the method is simple, but the accuracy decreases when actual usage differs from expected usage
Solution Approach 1:
The patent incorporates application-specific parameters (background current, self-discharge current, cut-off voltage) that reflect actual usage conditions directly into the calculation formula. This feedback mechanism allows the system to adapt to real-world usage patterns rather than relying on theoretical profiles, maintaining both simplicity and accuracy across different application scenarios.
4Reliability
If coulometric method and calendar self-discharge calculation are used, then the method accounts for basic battery behavior, but it fails to account for application-specific characteristics
Solution Approach 1:
The patent introduces application-specific parameters (background current, self-discharge current, cut-off voltage) that are tailored to each specific application scenario. By localizing the calculation to account for application-specific characteristics rather than using universal theoretical models, the method achieves both reliability in basic capacity calculation and adaptability to different usage conditions.
Data Source
AI summary
The present invention relates to a method for determining the lifetime of an electrochemical element of a battery in real time as a function of a determined application, applicable in the field of primary type batteries. The method comprises: —a step (1) of measuring at least one intensity value (I) of the current provided by the electrochemical element and of measuring at least one temperature value (T) of the electrochemical element in the determined application; —a step (4) of computing total lifetime allowing the availability time of the electrochemical element to be computed on the basis of a determined initial time, as a function of the one or more current intensity value(s) (I) and of the one or more temperature values (T) measured during the measuring step (1), as a function of a determined value of the capacity of the electrochemical element, of the cut-off voltage of the determined application, and of the background current of the determined application.