Battery SOH Detection Using Open-Circuit Voltage Curve Comparison
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Solution Overview
Problem
Existing battery health detection methods are inadequate for accurately evaluating and monitoring the state of health of batteries in electric vehicles and energy storage systems, leading to reduced driving range, performance decline, extended charging times, and safety risks.
Innovation Solution
A battery detection system and method that calculates the state of health by measuring open-circuit voltage and comparing it with a parametric curve, using a computation circuit to determine the difference and adjust for temperature and power, employing a function to calculate the state of health based on these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery health detection methods are improved to accurately evaluate and monitor state of health, then system stability and service life are extended, but detection complexity and measurement precision requirements increase
Solution Approach 1:
The patent changes the detection parameter from direct measurement of battery internal resistance or capacity to measurement of open-circuit voltage characteristics. By monitoring voltage at different states of charge and comparing with reference curves, the system achieves reliable health assessment without complex measurement equipment, thus improving reliability while controlling device complexity
Solution Approach 2:
The patent replaces complex electrical measurement systems with a simpler voltage-based detection method. Instead of using multiple sensors and complex circuitry to measure internal resistance and capacity directly, the system uses open-circuit voltage measurements combined with algorithmic comparison to achieve the same detection goal, reducing device complexity while maintaining reliability
2Duration of action of stationary object
If battery health detection methods are improved to accurately evaluate and monitor state of health, then service life is extended, but measurement precision requirements increase
Solution Approach 1:
The patent implements feedback by continuously comparing the measured open-circuit voltage with reference curves that represent healthy battery characteristics. The system adjusts its assessment based on the deviation between actual and reference voltage profiles, enabling precise detection of degradation trends over time. This feedback mechanism allows accurate monitoring of service life without requiring overly complex measurements
Solution Approach 2:
The patent uses preliminary reference curves that are established beforehand to represent the expected voltage characteristics of a healthy battery at different states of charge. By having these reference profiles ready in advance, the system can quickly and precisely compare actual battery performance against expected behavior, achieving high measurement precision for service life assessment without complex real-time calculations
3Productivity
If battery degradation is detected early through accurate health monitoring, then preventive maintenance can be performed, but detection time and response speed requirements increase
Solution Approach 1:
The patent enables continuous monitoring of battery health by repeatedly measuring open-circuit voltage at different states of charge and continuously comparing with reference curves. This continuous detection action allows the system to identify degradation trends in real-time without interruption, providing timely warnings for preventive maintenance while maximizing energy utilization efficiency. The continuous nature of the measurement eliminates detection delays
Data Source
AI summary
The present invention provides a system and a method for detecting a battery. The system includes the battery and a computation circuit. The computation circuit is electrically connected to the battery and is configured to measure the battery's parameters during a discharge process, and generate a parametric curve. The computation circuit also measures the battery's open-circuit voltage and generates an open-circuit voltage curve based on the open-circuit voltage. The computation circuit calculates a difference between the parametric curve and the open-circuit voltage curve, and determines the battery's state of health based on this difference.