UPS Battery SOH Calculation via Controlled Charge Discharge
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Solution Overview
Problem
Conventional methods for calculating the State of Health (SOH) of UPS batteries are inaccurate, especially in lithium-ion batteries, due to difficulties in controlling charge/discharge in a floating charge state and the inability to perform tests in operational systems, leading to inefficient maintenance and premature battery replacement.
Innovation Solution
A method and system that control a switch to execute charge and discharge operations, measuring current, voltage, and temperature, and calculating SOH using the battery's capacity and State of Charge (SOC) changes, allowing for repeated charge/discharge cycles to accurately assess the battery's aging state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional SOH calculation methods are used for UPS batteries, then the calculation can be performed with existing systems, but the accuracy of SOH calculation is insufficient
Solution Approach 1:
The UPS battery system performs self-testing by automatically controlling charge and discharge cycles without requiring external maintenance personnel. The BMS controls the switch to execute charge/discharge operations and calculates SOH autonomously, enabling the system to service itself and eliminating the need for periodic manual inspections.
Solution Approach 2:
The system implements periodic charge and discharge operations at predetermined time intervals to continuously monitor battery aging. The BMS executes these cyclic operations automatically, measuring current, voltage, and temperature changes during each cycle to accumulate data for accurate SOH calculation over time.
2Ease of operation
If the first method (accumulating current after full charge) is used to calculate SOH, then the calculation can be performed, but it is difficult to perform tests in actual operating systems
Solution Approach 1:
The system dynamically adapts to the UPS operating state by implementing charge/discharge operations specifically in floating charge mode. The BMS monitors the UPS operational status and executes battery testing operations that are compatible with continuous power supply requirements, allowing accurate SOH measurement without disrupting normal UPS function.
Solution Approach 2:
The system changes operational parameters by controlling the switch to enable arbitrary charge and discharge cycles within the floating charge state. This allows the battery to undergo controlled capacity cycles while maintaining UPS output, transforming the static floating charge condition into a dynamic testing regime that preserves operational compatibility.
3Measurement precision
If DCIR measurement through full or sample inspections is used, then SOH can be checked, but it requires periodic investment of maintenance personnel and time
Solution Approach 1:
The UPS battery system performs self-testing by automatically controlling charge and discharge cycles without requiring external maintenance personnel. The BMS controls the switch to execute charge/discharge operations and calculates SOH autonomously, enabling the system to service itself and eliminating the need for periodic manual inspections.
Solution Approach 2:
The system continuously monitors battery health through repeated charge/discharge operations rather than relying on periodic manual inspections. The BMS executes these operations automatically over time, providing continuous SOH tracking that eliminates downtime and removes the need for maintenance personnel intervention.
4Reliability
If the UPS battery is kept in floating charge state, then the battery can be ready for power failure, but it is difficult to calculate SOH based on floating charge properties
Solution Approach 1:
The system dynamically adapts to the UPS operating state by implementing charge and discharge operations specifically in floating charge mode. The BMS monitors the UPS operational status and executes battery testing operations that are compatible with continuous power supply requirements, allowing accurate SOH measurement without disrupting normal UPS function.
Solution Approach 2:
The system performs preliminary charge and discharge operations to prepare the battery for accurate SOH measurement while maintaining floating charge state. By executing controlled capacity cycles before measurement, the system ensures the battery is properly conditioned for testing while remaining ready for potential power failure scenarios.
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 precise calculation of UPS battery SOH, improving maintenance efficiency and extending battery life by accurately determining the aging state through controlled charge/discharge operations.
Implementation Method 1
a charge/discharge execution operation for executing charge and discharge of the battery to measure a current, a voltage, and a temperature
Data Source
AI summary
The present disclosure relates to a UPS battery aging state calculation method and system, and more specifically, to an aging state calculation method and system of a UPS battery for accurately calculating an aging state (i.e., State of Health (SOH)) of the UPS battery itself by repeatedly executing the charge and self-discharge of the UPS battery through a switch.