Battery State of Charge Control for Aging and Temperature
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Solution Overview
Problem
Vehicle batteries face challenges in maintaining optimal operating conditions due to temperature and aging effects, which impact their capacity and service life, especially in vehicles with high electrical demands and varying temperature conditions.
Innovation Solution
A method and device that dynamically adjust the battery's state of charge based on temperature and aging, using temperature-dependent and aging-dependent characteristic curves to set an optimal operating point, ensuring extended service life and optimal power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery operates at high power density to meet increasing electrical demands, then the power output is improved, but the battery service life deteriorates due to accelerated aging
Solution Approach 1:
The patent implements dynamic adjustment of the state of charge operating point based on real-time temperature and aging state measurements. The control device continuously adapts the optimal state of charge range according to changing battery conditions, transitioning from static to dynamic operation to resolve the contradiction between power output and service life
Solution Approach 2:
The patent changes the operating parameters (state of charge range) based on temperature and aging state. By adjusting the optimal state of charge range according to these parameters, the system optimizes the balance between power delivery capability and battery longevity under different operating conditions
2Power
If the battery capacity is increased to meet high electrical demands, then the power supply capability is improved, but the temperature-dependent performance deterioration worsens
Solution Approach 1:
The patent employs feedback control by continuously measuring temperature and aging state, then using this information to adjust the optimal state of charge range. This closed-loop feedback mechanism compensates for temperature-dependent performance losses and maintains optimal battery operation across varying thermal conditions
Solution Approach 2:
The system performs preliminary assessment of temperature and aging state to proactively adjust the operating point before significant performance degradation occurs. By anticipating temperature effects and aging impacts, the control device preemptively optimizes the state of charge range to maintain power supply capability
3Measurement precision
If complex current and voltage measurement methods are used to monitor battery condition, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent enables the battery system to self-monitor and self-optimize by using its own operational data (current, voltage, temperature) to determine its aging state and adjust its operating point. This self-service approach eliminates the need for complex external monitoring systems while maintaining high measurement precision
Data Source
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AI summary
The invention relates to a method for controlling the operating point (AP, AP1, AP2) of a battery (1), especially a lithium-ion battery, a nickel-metal hydride battery, a lithium-polymer battery. According to said method, the charging status (SoC1, SoC2) of the battery (1) is detected as a state variable determining the operating point (AP1, AP2) of the battery (1), the actual operating point (AP1, AP2) being adjusted by means of an associated setpoint value (SoCAP1, SoCAP2) for the charging status (SoC1, SoC2), which is continuously adapted in accordance with the temperature (T) and/or the aging condition (SoH).