Dynamic Battery Aging Control for Hybrid Vehicles
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Solution Overview
Problem
Existing methods for controlling the aging of high-voltage batteries in hybrid vehicles are inadequate, as they fail to effectively maintain the batteries' functionality throughout their intended service life due to factors like operating temperature, charging cycles, and thermal stress, leading to premature aging despite protective measures like voltage limitation and current control.
Innovation Solution
A method for open-loop or closed-loop control of operating parameters such as charging condition, power, and temperature, which monitors the battery's aging state and adjusts permissible limits to ensure the battery meets minimum criteria until the end of its target service life by comparing actual to target aging states, using internal resistance and capacity as indicators, and implementing strategies like reducing charging limits and power peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant or slightly dynamic limit values are defined for protecting the battery, then damage avoidance is improved, but the battery still ages within these limits due to thermal stress and charging/discharging cycles
Solution Approach 1:
The patent implements dynamic adaptation of operating parameter limits based on the actual aging state of the battery. Instead of using fixed limit values, the control device continuously adjusts permissible operating ranges (charging/discharging power, temperature limits, voltage limits) according to real-time aging indicators such as internal resistance and capacity. This dynamic approach allows the battery to operate closer to its actual capabilities at each moment, preventing premature aging while maximizing utilization within the target service life.
Solution Approach 2:
The patent employs a closed-loop feedback control system that continuously monitors aging indicators (internal resistance, capacity) and compares the actual aging state against a target aging state. Based on this comparison, the control device automatically adjusts operating parameter limits to keep the actual aging trajectory aligned with the target. This feedback mechanism enables real-time optimization of battery protection strategies, preventing both over-protection (which would reduce utilization) and under-protection (which would accelerate aging).
2Productivity
If the battery is utilized fully without restrictions, then productivity is improved, but the aging state deteriorates faster than expected
Solution Approach 1:
The system dynamically adjusts the permissible operating parameter ranges based on the real-time aging state rather than applying static restrictions. This allows the battery to be utilized more aggressively when its actual condition permits, while automatically reducing utilization when aging indicators suggest vulnerability. The dynamic optimization ensures maximum productivity extraction without compromising the target service life.
Solution Approach 2:
The patent changes the operating parameters (charging/discharging power limits, temperature thresholds, voltage limits) as functions of the measured aging indicators. By continuously updating these parameters based on internal resistance and capacity measurements, the system adapts the utilization strategy to match the battery's actual state, thereby maximizing productivity while preventing excessive aging.
3Reliability
If operating parameter ranges are restricted to prevent aging, then reliability is improved, but the usable capacity and power are reduced
Solution Approach 1:
The closed-loop feedback control continuously monitors the aging state and adjusts the permissible operating parameter ranges accordingly. This feedback mechanism ensures that restrictions are applied only when and where necessary to maintain reliability, rather than imposing blanket limitations. The system optimizes the balance between protection and utilization by adapting limits in real-time based on actual aging indicators.
Solution Approach 2:
The patent implements dynamic adjustment of operating parameter limits that respond to the battery's actual condition. When the aging state is within acceptable parameters, the system allows broader utilization of available capacity and power. When aging indicators suggest vulnerability, restrictions are dynamically applied. This dynamic approach maximizes the usable energy capacity while maintaining reliability throughout the target service life.
Data Source
AI summary
A method is provided for the open-loop or closed-loop control of at least one operating parameter of an electric energy accumulator influencing the aging state of the electric energy accumulator. The method determines the actual aging state of the electric energy accumulator, compares the actual aging state with a target aging state predefined for the momentary age of the energy accumulator, and restricts an operating parameter range permitted for the at least one operating parameter if the actual aging state is worse than the target aging state.