Rechargeable Battery State Detection for Micro-Short Risk
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Solution Overview
Problem
Existing methods for determining the state of rechargeable batteries, particularly in detecting micro-short circuits, are inadequate as they rely on increased internal resistance linked to electrolyte solution depletion, failing to detect circuits prone to micro-short formation even when the solution is intact.
Innovation Solution
A method and device that measure electron transfer resistance by applying a voltage or current of higher frequency to the battery's electrode system, determining inter-electrode distance and electrolyte sufficiency through threshold comparisons, and assessing circuit voltage to accurately identify conforming battery modules and prevent micro-short circuit formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AC internal resistance measurement is used to detect micro-short circuits, then electrolyte solution depletion can be detected, but micro-short circuits formed without electrolyte depletion cannot be detected
Solution Approach 1:
The patent changes the measurement parameter from low-frequency AC internal resistance to high-frequency electron transfer resistance. By applying voltage or current with a frequency of 100 Hz or higher to the electrode system, the method measures electron transfer resistance which reflects inter-electrode distance changes, enabling detection of micro-short circuits that do not involve electrolyte depletion.
Solution Approach 2:
The patent introduces electron transfer resistance measurement as an intermediary indicator to detect micro-short circuit risks. Instead of directly measuring the micro-short circuit, it measures the electron transfer resistance of the electrode system, which changes in response to inter-electrode distance reduction, serving as an early warning indicator.
2Ease of manufacture
If only circuit voltage OCV measurement is used, then greatly decreased voltage can be detected, but early signs of micro-short circuit formation cannot be detected
Solution Approach 1:
The patent performs preliminary measurement of electron transfer resistance before micro-short circuits fully develop. By measuring the electron transfer resistance of the electrode system with high-frequency voltage or current, the method detects early signs of inter-electrode distance reduction, allowing preventive action before actual micro-short circuits form.
3Measurement precision
If high-frequency voltage or current is applied to measure electron transfer resistance, then inter-electrode distance can be assessed, but measurement complexity increases
Solution Approach 1:
The patent makes the measurement device universal by enabling it to perform multiple functions: measuring electron transfer resistance, assessing inter-electrode distance, and evaluating micro-short circuit risk all through a single high-frequency impedance measurement process, reducing the need for separate specialized devices.
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 enhances the accuracy of battery state determination, ensuring only high-quality modules are reused, thereby improving the reliability and longevity of reformed battery packs by detecting potential micro-short circuits before they occur.
Implementation Method 1
measuring an electron transfer resistance of a rechargeable battery by applying a voltage or current having a predetermined frequency of 100 Hz or higher to an electrode system of the rechargeable battery
Data Source
AI summary
A rechargeable battery state determination method determines whether a rechargeable battery is in a micro-short-circuit-prone state, which is a state that is highly likely to form a micro-short circuit. The rechargeable battery state determination method includes measuring an electron transfer resistance of the rechargeable battery by applying a voltage or current having a predetermined or higher frequency to an electrode system of the rechargeable battery, determining whether an inter-electrode distance is satisfactory based on a comparison of the measured electron transfer resistance of the rechargeable battery with a predetermined lower limit threshold value, in which the determining whether an inter-electrode distance is satisfactory including determining that the inter-electrode distance is satisfactory when the measured electron transfer resistance of the rechargeable battery is greater than or equal to the lower limit threshold value, and determining that the rechargeable battery is a conforming piece when the inter-electrode distance is satisfactory.