Battery Control Device Cell Disconnection Diagnosis
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Solution Overview
Problem
Rechargeable batteries with multiple cells face reliability issues due to disconnection of cells, which can lead to uneven charging currents and reduced performance, as existing onboard controllers lack the capability to diagnose disconnected cells.
Innovation Solution
A battery control device that assesses multicell battery health by obtaining measured and expected indicator values for parameters like voltage and internal resistance, generating alerts when discrepancies exceed predefined thresholds, indicating potential cell disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional onboard controllers are used to monitor battery health, then basic state of charge monitoring is achieved, but cell disconnection diagnosis capability is lost
Solution Approach 1:
The system implements feedback by continuously monitoring battery parameters (voltage, temperature, current) and comparing them against expected values to detect cell disconnection. The controller receives feedback from the battery pack and adjusts its diagnostic behavior based on detected anomalies, enabling reliable cell disconnection diagnosis through parameter comparison and threshold evaluation.
2Reliability
If cell disconnection is not detected, then battery continues operating, but remaining cells are subjected to excessive charging current
Solution Approach 1:
The system performs preliminary action by detecting cell disconnection through parameter monitoring before excessive charging current can damage the remaining cells. The controller proactively identifies cell disconnection by comparing measured parameters against expected values and generates alerts before the battery is charged, preventing harmful effects from occurring.
Solution Approach 2:
The system applies preliminary anti-action by preventing excessive charging current from reaching the battery through early detection of cell disconnection. The controller generates cell loss alerts that enable preventive measures to be taken before the harmful effect of overcharging occurs, counteracting the potential damage before it happens.
3Reliability
If battery parameters are monitored continuously, then cell disconnection is detected early, but energy consumption increases
Solution Approach 1:
The system applies partial action by monitoring only the specific battery parameters necessary for cell disconnection detection (voltage, temperature, current) rather than continuously monitoring all possible parameters. The controller performs diagnostic comparisons at appropriate intervals, achieving reliable early detection without the excessive energy consumption of continuous full-parameter monitoring.
Data Source
AI summary
A method of assessing multicell battery health in a battery control device includes: obtaining (i) a measured indicator value corresponding to an indicator battery parameter, and (ii) a measured first input value corresponding to a first input parameter; obtaining, based on the first input value, an expected indicator value corresponding to the indicator battery parameter; determining whether a difference between the measured indicator value and the expected indicator value exceeds a predefined cell loss threshold; and when the difference exceeds the predefined cell loss threshold, generating a cell loss alert.