High-Voltage Battery Charge Control for Reduced Aging at Standstill
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Solution Overview
Problem
Electric vehicle batteries age significantly when kept at high state of charge for extended periods, particularly when the vehicle is stationary for an extended time without being moved, leading to premature degradation and increased costs.
Innovation Solution
A protective device with an electronic control unit that monitors and controls the battery state of charge via an external energy network, using a mobile terminal to predict the vehicle's usage by determining the user's distance from the vehicle, and reducing the state of charge to 80% when certain criteria are met, such as prolonged stationary time and distance threshold, with optional user approval or automatic adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery is kept at high state of charge for extended periods, then the vehicle is ready for immediate use, but the battery ages significantly and degradation increases
Solution Approach 1:
The patent implements dynamic state of charge adjustment based on predicted vehicle usage. The control unit continuously monitors user location data and automatically modifies the charging strategy: maintaining high SoC when vehicle is expected to be used soon, and reducing SoC to 80% when prolonged stationary period is predicted. This dynamic adaptation resolves the contradiction by making the battery management system flexible rather than static.
Solution Approach 2:
The system performs preliminary prediction of vehicle usage by analyzing user location data and calendar information before the actual charging decision. By predicting whether the vehicle will be used in the near future, the control unit can proactively adjust the state of charge to optimal levels, preventing unnecessary aging while ensuring readiness when needed.
2Duration of action of moving object
If the state of charge is reduced to 80% to reduce aging, then battery life is extended, but the vehicle range is limited
Solution Approach 1:
The patent dynamically adjusts the state of charge threshold based on predicted vehicle usage. When the system predicts the vehicle will be used soon (user nearby or calendar event scheduled), it maintains higher state of charge to ensure adequate range. When prolonged stationary period is predicted (user away for extended time), it reduces state of charge to 80% to minimize aging. This dynamic approach ensures range is only limited when actually needed.
Solution Approach 2:
The control unit changes the critical parameter (state of charge threshold) based on operating conditions. The threshold dynamically shifts between approximately 80% and higher values depending on predicted usage patterns, user location distance, and time factors. This parameter adaptation allows the system to optimize between battery life extension and range availability.
3Ease of operation
If the vehicle remains plugged in for a long time without being moved, then charging convenience is maintained, but the battery ages to an unnecessarily significant degree
Solution Approach 1:
The patent implements an autonomous battery management system that automatically monitors user location, predicts usage patterns, and adjusts state of charge without requiring manual user intervention. The control unit independently decides when to maintain high charging levels and when to limit state of charge to 80%, eliminating the need for users to manually program charging schedules or monitor battery status.
Solution Approach 2:
The system continuously receives feedback from user terminal location data and calendar information, processing this information to predict near-future vehicle usage. Based on this feedback loop, the control unit automatically adjusts charging behavior: maintaining high state of charge when usage is imminent, and reducing to 80% when prolonged stationary period is predicted, thus protecting battery life while preserving charging convenience.
Data Source
AI summary
A protective device for a high-voltage battery in an electrified motor vehicle including a charging connection, a terminal, and an electronic control unit. The electronic control unit is connected to an on-board function module configured to locate the motor vehicle and is wirelessly connected to a mobile terminal of a user of the vehicle. The terminal has a function module for locating the user. The electronic control unit is configured to receive data of the mobile terminal, which data represent at least a distance of the user from the motor vehicle when this distance is greater than a predefined limit value.