Secondary Battery Evaluation via In-Use Voltage Response Analysis
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Solution Overview
Problem
Existing methods for evaluating the performance of secondary batteries, such as lithium-ion batteries, are limited in their ability to analyze battery characteristics in real-world conditions, particularly when the battery is connected to a load and undergoing repeated charging and discharging cycles.
Innovation Solution
A battery performance evaluation device and method that involves generating a current and inputting it into the secondary battery, recognizing the measured output voltage, and comparing it to a model output voltage to evaluate the battery's performance based on communication with the electronic apparatus or charger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AC impedance analysis method based on frequency response analysis is used to enhance internal resistance measurement, then measurement precision is improved, but device complexity increases due to requiring dedicated frequency response analyzer
Solution Approach 1:
The patent creates a virtual frequency response analyzer by implementing the frequency response analysis function as a software program on a general-purpose computer. Instead of using a dedicated physical instrument, the system copies the analytical capabilities of an FRA into a software application that processes voltage and current waveforms to calculate internal resistance characteristics through frequency spectrum analysis.
Solution Approach 2:
The patent replaces the mechanical/electronic dedicated frequency response analyzer instrument with a software-based computational system. The physical measurement device is substituted by a computer program that performs the same analytical function through digital signal processing, transforming hardware-dependent measurement into software-based calculation.
2Ease of operation
If basic voltage, current, and temperature measurement is used in practical operation, then ease of operation is improved, but measurement precision deteriorates due to inability to analyze battery characteristics in detail
Solution Approach 1:
The patent enables continuous performance evaluation by automatically performing frequency response analysis on voltage and current waveforms during normal charging and discharging operations. Instead of requiring separate measurement sessions, the system continuously monitors and analyzes the battery's dynamic response to load changes, maintaining useful action throughout the battery's operational lifecycle.
Solution Approach 2:
The patent implements feedback by using the measured voltage and current waveforms to calculate internal resistance characteristics, then using this information to evaluate battery performance and provide insights about battery health and state. The system feeds back detailed analytical results about battery characteristics based on the basic measurements already being taken during operation.
Data Source
AI summary
Provided is a device and the like capable of increasing the convenience in performance evaluation of a secondary battery. A battery performance evaluation device 100 evaluates the performance of a secondary battery 240 installed in an electronic apparatus 200 based on mutual communication between the electronic apparatus 200 and/or a charger 400, to which the electronic apparatus 200 is connected, and the battery performance evaluation device 100. Then, battery performance information Info(D) corresponding to the evaluation result is output to an output interface 204 of the electronic apparatus 200. Thus, a user can ascertain the performance evaluation result of the secondary battery 240 without the need to take the electronic apparatus 200 or the secondary battery 240 in a specialized institution or the like, thereby increasing the convenience for the user of the electronic apparatus 200.