EV Battery Energy Estimation With Abnormal Cell Compensation
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Solution Overview
Problem
Current energy management systems for electric vehicles do not accurately account for the impact of abnormal battery cells, leading to underestimation of remaining energy, which can result in the vehicle running out of charge before reaching the desired destination.
Innovation Solution
A supervisory computer system that monitors the state of charge, capacity, and resistance of both normal and abnormal battery subsystems, calculates a low integration bound value, and determines a global remaining energy value by summing the energy values of all subsystems, allowing for accurate energy consumption rate adjustments and navigation instructions to ensure the vehicle reaches its destination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current energy management systems calculate remaining energy assuming all battery cells are functioning properly, then the calculation is simple, but the remaining energy value is inaccurate and underestimated
Solution Approach 1:
The battery system is segmented into normal battery subsystems and abnormal battery subsystems. The supervisory computer identifies which subsystems are functioning properly and which contain abnormal cells, then calculates remaining energy values separately for each subsystem. This segmentation allows accurate accounting of the abnormal subsystem's lower charge state and its draw on normal subsystems, resolving the contradiction between simple calculation and accurate measurement.
2Reliability
If the abnormal battery cell continuously draws from normal battery subsystems, then the abnormal cell maintains its charge, but the overall remaining energy of the battery pack decreases
Solution Approach 1:
The supervisory computer continuously monitors the state of charge and capacity of each battery subsystem, including the abnormal one. It calculates the draw from the abnormal subsystem and feeds this information back into the remaining energy calculation. This feedback mechanism ensures that the system accurately accounts for the continuous energy transfer from normal to abnormal subsystems, providing reliable range information that reflects the actual energy loss.
3Measurement precision
If the vehicle has less remaining energy than communicated to the operator, then the energy management is conservative, but the operator may be stranded before reaching the destination
Solution Approach 1:
The supervisory computer performs preliminary identification of abnormal battery subsystems and calculates their impact on remaining energy before the operator needs this information. By proactively detecting abnormal cells and incorporating their effect into the remaining energy calculation, the system provides accurate range information in advance, preventing the harmful outcome of the operator being stranded due to inaccurate energy assessment.
Data Source
AI summary
A supervisory computer is used with an energy management system of an electric vehicle. The energy management system includes a battery system having a plurality of battery subsystems. One of the battery subsystems is an abnormal battery subsystem while the remaining battery subsystems are normal battery subsystems. The supervisory computer includes at least one processor and at least one non-transitory computer-readable medium. The processor monitors the remaining state of charge, capacity, and resistance of the battery system and monitor the remaining state of charge and capacity of the abnormal battery subsystem, calculate a low integration bound value, calculate a remaining energy value for all of the normal battery subsystems with respect to the low integration value, calculate a remaining energy value for the abnormal battery subsystem, and summate the remaining energy values of the normal and abnormal battery subsystems to determine a global remaining energy value for the battery system.