Battery Aging Level Determination via Steady OCV
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Solution Overview
Problem
Current methods for determining the aging level of lithium batteries are time-consuming, requiring either draining the battery or measuring internal resistance to assess available capacity or aging level.
Innovation Solution
A method involving multiple charging devices and obtaining devices to measure steady open-circuit voltages and stop-charge parameters of batteries, allowing for the determination of aging levels without draining the battery or measuring internal resistance, thereby reducing the time required for assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery is drained by a specific current to determine available capacity, then the aging level can be determined precisely, but the method consumes a lot of time
Solution Approach 1:
The patent performs preliminary charging of the battery to a predetermined voltage before measurement, and uses pre-established reference tables containing open-circuit voltage and internal resistance data for batteries at different aging levels. This preliminary preparation eliminates the need for time-consuming battery draining during actual aging level determination, resolving the contradiction between measurement precision and time consumption.
Solution Approach 2:
The patent replaces the mechanical/electrical process of draining the battery with a measurement-based approach. Instead of discharging the battery to determine capacity, the system measures open-circuit voltage and internal resistance, then uses these measurements to lookup aging level information from pre-established reference tables, significantly reducing time while maintaining precision.
2Measurement precision
If the internal resistance is measured to determine aging level, then the aging level can be determined, but it consumes a lot of time to acquire the relation of internal resistance and aging level
Solution Approach 1:
The patent pre-establishes reference tables containing the relationships between open-circuit voltage, internal resistance, and aging level for batteries at different aging states. These reference data are obtained in advance through controlled experiments and stored for quick lookup, eliminating the need to perform time-consuming measurements and calculations during actual aging level determination.
Solution Approach 2:
The patent creates reference tables that copy and store the characteristic relationships between electrical parameters (open-circuit voltage, internal resistance) and aging level. Instead of repeatedly measuring and analyzing these relationships, the system uses these pre-copied reference data to quickly determine aging level by comparing measured values against the stored reference information.
3Measurement precision
If steady open-circuit voltage measurements are taken at multiple stop-charge conditions, then accurate aging level comparison is enabled, but the charging process takes time
Solution Approach 1:
The patent takes measurements at multiple stop-charge conditions during the charging process, which provides redundant data points. This partial excessive action ensures that even if some measurements are less accurate, the overall aging level determination remains precise. The multiple measurements allow for better comparison and verification, resolving the contradiction between measurement accuracy and time consumption.
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 method enables the determination of battery aging levels in a more efficient manner, reducing the time needed for analysis and providing accurate comparisons between batteries without the need for extensive charging or resistance measurements.
Implementation Method 1
Lithium batteries are one of the most common energy storage devices
Implementation Method 2
An available capacity of the Lithium battery reduces along with increase of charging/discharging cycles
Data Source
AI summary
A method of determining an aging level of a battery includes utilizing a first charging device to charge a first battery; utilizing a second obtaining device to obtain a plurality of first steady open-circuit voltages (OCVs) of the first battery when a charging state of the first battery respectively reaches a plurality of first stop-charge conditions; utilizing a second charging device to charge a second battery; utilizing a third obtaining device to obtain a stop-charge parameter of the second battery and a second steady OCV of the second battery corresponding to the stop-charge parameter of the second battery; and utilizing an aging level determining device to determine an aging level of the second battery relative to the first battery according to the second steady OCV of the second battery and one of the first steady OCVs of the first battery corresponding to the stop-charge parameter of the second battery.