Battery SOH Analysis via Temperature Increase Rate Comparison
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Solution Overview
Problem
Existing battery technologies face challenges in accurately analyzing the State of Health (SOH) and determining the reusability of batteries, especially as they degrade over multiple charge/discharge cycles, leading to increased heat generation and potential sudden failure.
Innovation Solution
A SOH analyzing apparatus and method that measures and compares temperature increase rates of a battery during discharge, using a reference temperature increase rate from a reference battery to determine the degree of degradation, allowing for classification of battery reusability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery capacity reduces below the threshold, then battery performance notably reduces and heat generation increases, but accurate SOH analysis becomes more difficult
Solution Approach 1:
The patent replaces electrical resistance-based SOH analysis with thermal field-based analysis. By measuring temperature changes during charge/discharge cycles and calculating temperature increase rates, the system determines SOH through thermal characteristics rather than electrical resistance, providing an alternative measurement approach that maintains accuracy as battery performance degrades
Solution Approach 2:
The patent changes the measurement parameter from electrical resistance to temperature. By monitoring temperature changes during charge/discharge cycles and calculating the temperature increase rate (dT/dt), the system obtains SOH information through thermal parameters that remain measurable even when electrical performance deteriorates significantly
2Ease of manufacture
If battery is used for ESS after conversion from EV, then cost is reduced, but sudden failure risk increases due to gas generation and electrolyte decomposition
Solution Approach 1:
The patent performs preliminary SOH analysis and safety assessment before reusing batteries in ESS. By measuring temperature characteristics during controlled charge/discharge cycles and calculating temperature increase rates, the system identifies batteries at risk of sudden failure before they are deployed, allowing for pre-screening and classification of reusable versus non-reusable batteries
Solution Approach 2:
The patent establishes a feedback mechanism where temperature measurements during charge/discharge cycles are continuously monitored and analyzed. The calculated temperature increase rates provide feedback on battery health status, enabling real-time assessment of battery stability and identification of degradation trends that may lead to sudden failure
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
Enables simple and accurate analysis of battery SOH by monitoring temperature changes, effectively classifying batteries for reuse or disposal, thereby extending battery life and reducing waste.
Implementation Method 1
as the number of charge/discharge cycles increases, capacity reduces. The capacity reduction may be caused by the degradation of the active material coated on the electrode, the side reaction of the electrolyte, the pore reduction of the separator, etc. When battery capacity reduces, resistance increases and electrical energy that is lost as heat increases.
Data Source
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AI summary
Disclosed is an apparatus and method capable of analyzing SOH of a battery, and an apparatus and method capable of diagnosing whether or not to reuse the battery. The battery SOH analyzing apparatus includes a memory unit configured to store reference temperature data according to DOD of a reference battery, or a reference temperature increase rate (K1) of a discharge last half with DOD of 50% or above, calculated therefrom; and a control unit. The control unit includes a measuring and recording unit configured to measure temperature data according to DOD while a battery in a full charge state is being discharged and store the measured temperature data in the memory unit; a calculating unit configured to calculate a temperature increase rate (K2) of the discharge last half with DOD of 50% or above from the temperature data according to DOD obtained by the measuring and recording unit; and a determining unit configured to determine a degree of degradation of the battery in comparison to the reference battery by comparing the reference temperature increase rate (K1) and the temperature increase rate (K2).