EV Battery Deterioration Diagnosis Under Inverter Failure Back-EMF
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Solution Overview
Problem
Electrically powered vehicles face rapid battery deterioration due to high currents generated by counter electromotive forces, which existing technologies fail to effectively diagnose and address, leading to potential battery damage and reduced performance.
Innovation Solution
An electrically powered vehicle equipped with a diagnosis device that determines rapid battery deterioration based on battery temperature and current input, or temperature and rate of change in voltage, using predefined maps to identify when replacement is necessary, thereby preventing further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective function such as cut-off of the main relay is activated to prevent high current damage, then battery safety is improved, but the high current may already have been applied to the battery causing rapid deterioration
Solution Approach 1:
The diagnosis device performs preliminary assessment of battery deterioration by analyzing temperature and current/voltage characteristics before the protective function is activated. This allows the system to identify rapid deterioration early in the process, enabling preventive measures to be taken before the main relay cut-off occurs, thus resolving the time delay between high current application and protective action activation
2Measurement precision
If existing technologies are used to detect abnormal conditions, then inverter and peripheral device abnormalities are detected, but rapid deterioration of the battery by counter electromotive force is not diagnosed
Solution Approach 1:
The diagnosis device implements a feedback mechanism that continuously monitors battery temperature and current/voltage characteristics, and uses this information to determine whether rapid deterioration has occurred. This feedback loop provides specific information about battery deterioration that was previously undetected by existing technologies, complementing the existing abnormal condition detection system
Solution Approach 2:
The diagnosis device acts as an intermediary between the existing abnormal condition detection system and the battery, analyzing temperature and electrical characteristics to provide information about rapid deterioration. This intermediary function bridges the gap between general abnormal condition detection and specific battery deterioration diagnosis
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
The solution effectively diagnoses rapid battery deterioration and prompts necessary replacements, ensuring the battery's health and preventing abrupt capacity loss or overheating, thus maintaining vehicle performance and safety.
Implementation Method 1
When a device that controls the MG is in an abnormal condition or fails, a counter electromotive force may be generated by an inductive voltage produced by the coil simultaneously with occurrence of the abnormal condition or the failure
Implementation Method 2
a battery, a motor generator driven with electric power stored in the battery
Data Source
AI summary
When a PCU (inverter) of an electrically powered vehicle fails, a first map where a temperature and a current of a battery are defined as parameters or a second map where a temperature and a rate of change in voltage of the battery are defined as parameters is used to determine whether or not rapid deterioration of the battery has occurred. When it is determined that the rapid deterioration of the battery has occurred, a battery replacement indicator is turned on.