Real-Time BBU SOH Monitoring via Internal Impedance
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Solution Overview
Problem
Traditional Battery Management Systems (BMS) for Backup Battery Units (BBUs) face challenges in accurately determining the Status of Health (SOH) of batteries in real-time without interrupting normal system operations, often requiring cooler temperatures and deeper discharging, which can be restrictive and burdensome for storage system designs.
Innovation Solution
A BBU cell with monitoring circuitry comprising a MOSFET and resistor in series, connected to a master control unit, allows for real-time SOH determination by measuring open circuit voltage and output voltage, enabling direct measurement of internal battery impedance and calculating SOH without system intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional BMS methods are used to monitor battery health, then measurement precision can be achieved, but the system requires cooler temperatures and deeper discharging which disrupts normal operations and increases device complexity
Solution Approach 1:
The patent applies preliminary action by performing SOH measurement calculations in advance during normal operation cycles, using the relationship between voltage, current, and internal impedance that naturally occurs during battery discharge. This allows SOH to be determined before critical issues arise, without requiring special test conditions or disrupting normal system operations.
Solution Approach 2:
The battery management system performs self-service by using the battery's own operational characteristics (voltage drop, current, internal impedance) to determine its health status. The system leverages naturally occurring electrical parameters during normal discharge cycles rather than requiring external test equipment or specialized test procedures, enabling continuous monitoring without interrupting normal operations.
2Measurement precision
If traditional BMS methods are used, then SOH can be determined, but the measurement process interrupts normal system operations and requires deeper discharging
Solution Approach 1:
The patent ensures continuity of useful action by performing SOH measurements during normal battery discharge cycles without requiring separate test procedures. The system continuously monitors voltage, current, and calculates internal impedance in real-time during normal operation, eliminating the need to stop or interrupt normal system operations for health status determination.
Solution Approach 2:
The system performs preliminary calculations of internal impedance and SOH during normal operational cycles, using the voltage-current relationships that naturally occur during discharge. This preliminary determination of battery health status allows the system to maintain continuous operation without requiring post-measurement recovery or interruption periods.
3Reliability
If traditional BMS methods are used, then battery health can be monitored, but the system becomes more complex and burdensome for storage system designs
Solution Approach 1:
The patent applies universality by designing a multi-functional approach where the same voltage and current measurement circuitry used for normal power management also serves SOH monitoring purposes. The internal impedance calculation method is universally applicable across different battery types and operating conditions, eliminating the need for separate specialized monitoring hardware or complex test procedures.
Solution Approach 2:
The battery management system performs self-service by using the battery's own operational electrical characteristics (voltage drop, current, internal impedance) to determine its health status. This self-diagnostic capability eliminates the need for external test equipment, complex measurement circuits, or specialized monitoring hardware, thereby reducing overall system complexity while maintaining reliable health monitoring.
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 solution provides accurate, real-time SOH values for in-service BBUs without disrupting normal operations, overcoming traditional BMS constraints by allowing for minimal impact on platform design and enabling seamless integration with legacy systems.
Implementation Method 1
measuring an open circuit voltage of monitoring circuitry connected to a battery of the BBU. The monitoring circuitry comprising a MOSFET and a resistor connected in a series. The method also includes turning on the MOSFET connected in series to the resistor, measuring an output voltage of the BBU, and determining the SOH of the battery using the open circuit voltage and the output voltage of the BBU after the MOSFET has been enabled.
Data Source
AI summary
A Battery Backup (BBU) device, method, and system is disclosed. A BBU cell includes a battery with an internal impedance. The BBU cell includes monitoring circuitry connected to the battery for monitoring a Status of Health (SOH) of the battery. The monitoring circuitry includes a MOSFET and a resistor connected in series and a master control unit connected to the MOSFET for controlling the MOSFET and determining the SOH of the battery.