Battery Voltage Monitoring for Polarization-Based Deterioration Detection
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Solution Overview
Problem
Existing battery systems struggle to accurately estimate the presence or absence of high-rate deterioration in secondary batteries with non-aqueous electrolytes, leading to potential lithium deposition and local overcharging or overdischarging due to detection errors and the inability to distinguish between high-rate and wear deterioration.
Innovation Solution
A battery system that includes a voltage sensor and a processor to calculate an evaluation value based on the degree of polarization mitigation after charging or discharging, allowing for accurate estimation of high-rate deterioration by comparing voltage values before and after polarization elimination, thereby avoiding the accumulation of detection errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current sensor detection values are integrated to evaluate high-rate deterioration, then deterioration estimation is performed, but detection errors accumulate in the integrated value leading to non-negligible errors
Solution Approach 1:
The patent extracts only the voltage component for deterioration evaluation, eliminating the need to integrate current detection values. By measuring voltage at specific time points (immediately after charging/discharging and after polarization elimination), the system obtains deterioration information without accumulating detection errors from continuous current integration.
Solution Approach 2:
The patent introduces voltage as an intermediary measurement to indirectly assess deterioration. Instead of directly integrating current values, the system uses voltage changes (which reflect polarization mitigation) as a mediator to evaluate high-rate deterioration, thereby avoiding error accumulation in direct current integration.
2Measurement precision
If current integration method is used to evaluate high-rate deterioration, then deterioration can be assessed, but it cannot distinguish between high-rate deterioration and wear deterioration
Solution Approach 1:
The patent changes the measurement parameter from current integration to voltage measurement at specific time points. By measuring voltage immediately after charging/discharging and after polarization elimination, and using the change in voltage (polarization mitigation), the system captures characteristics specific to high-rate deterioration rather than general wear deterioration.
Solution Approach 2:
The patent employs periodic measurement at specific intervals: immediately after charging/discharging and after polarization elimination. This periodic voltage measurement approach captures the dynamic polarization mitigation process, which is characteristic of high-rate deterioration, rather than providing only cumulative wear information.
3Measurement precision
If voltage measurement is performed continuously, then accurate deterioration estimation is achieved, but energy consumption and system complexity increase
Solution Approach 1:
The patent performs voltage measurement periodically at specific time points (immediately after charging/discharging and after polarization elimination) rather than continuously. This periodic measurement approach maintains accurate deterioration estimation while significantly reducing energy consumption and system complexity compared to continuous monitoring.
Solution Approach 2:
The patent performs voltage measurement in advance at predetermined time points (immediately after charging/discharging and after polarization elimination). By measuring at these specific moments, the system obtains sufficient deterioration information without requiring continuous monitoring, thereby reducing energy consumption while maintaining accuracy.
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 precise estimation of high-rate deterioration, allowing for timely restriction of charging and discharging power to prevent further deterioration, thus avoiding lithium deposition and other issues.
Implementation Method 1
a voltage sensor detects a voltage value of the secondary battery
Implementation Method 2
calculating, in accordance with the voltage value, an evaluation value for evaluating a degree of polarization mitigation after charging or discharging of the secondary battery
Data Source
AI summary
A battery system is configured to estimate a presence or absence of deterioration of a battery. This deterioration is a phenomenon in which an internal resistance of the secondary battery increases due to uneven ion concentration in a non-aqueous electrolyte. The battery system includes a voltage sensor and an ECU. The voltage sensor detects a voltage value of the battery. The ECU is configured to perform a calculation process and an estimation process. The calculation process includes a process of calculating, in accordance with the voltage value, an evaluation value for evaluating a degree of polarization mitigation after charging or discharging of the battery. The estimation process includes a process of estimating the presence or absence of the deterioration in accordance with the evaluation value.