Battery Bus Bar Open Circuit Detection via Voltage Threshold
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery systems lack an effective method to detect open circuit conditions in the bus bar between cell balancing circuits, which can lead to inefficiencies and potential damage.
Innovation Solution
A battery system that includes a microcontroller commanding transistors in cell balancing circuits to turn off, allowing an integrated circuit to measure voltage across the bus bar and determine if an open circuit condition exists by comparing the voltage value to a threshold, indicating an open circuit if it exceeds that value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cell balancing circuits are used to equalize battery cell voltages, then battery pack performance is improved, but the risk of open circuit conditions in the bus bar increases without detection capability
Solution Approach 1:
The system uses sense lines to continuously monitor voltage between battery cells and provides feedback to the controller. When an open circuit condition is detected through voltage threshold comparison, the controller receives feedback signals and can respond by disabling balancing circuits or activating backup pathways, thereby maintaining reliability while preserving productivity.
Solution Approach 2:
Sense lines act as intermediary elements that indirectly detect open circuit conditions by measuring voltage differences between battery cells. This intermediary measurement approach allows detection without directly monitoring the bus bar connection, enabling reliable fault detection while maintaining system productivity.
2Reliability
If voltage measurement is performed continuously to detect open circuit conditions, then detection reliability is improved, but energy consumption increases
Solution Approach 1:
The system performs voltage measurements periodically through balancing cycles rather than continuously. The controller enables balancing circuits at specific intervals to equalize cell voltages and simultaneously performs open circuit detection during these periodic operations, thereby maintaining detection reliability while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The system performs preliminary voltage measurements and comparisons during normal balancing operations before actual open circuit conditions develop into critical failures. By detecting voltage anomalies during routine balancing cycles, the system maintains high detection reliability without requiring additional continuous energy expenditure.
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 the detection of open circuit conditions in the bus bar, preventing inefficiencies and potential damage by accurately identifying when an open circuit occurs, allowing for timely intervention.
Implementation Method 1
an integrated circuit measures a first voltage between the second and third sense lines while the first and second cell balancing circuits are turned off
Data Source
AI summary
A battery system has a first cell balancing circuit and a second cell balancing circuit with a bus bar disposed therebetween. The battery system further includes an integrated circuit measuring a first voltage between two sense lines coupled to opposite ends of the bus bar while the first cell balancing circuit and a second cell balancing circuit are turned off, and determining a voltage value based on the first voltage. A microcontroller receives the voltage value and determines that an open circuit condition exists in the bus bar if the voltage value is greater than a threshold voltage value.