Battery Power Limit Control Using Temperature-Adaptive Voltage Intervals
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Solution Overview
Problem
The existing voltage-segmented power limit method for battery management systems has low accuracy and provides inadequate protection due to high requirements for selecting voltage intervals and power limit coefficients, leading to inconsistent power limitation.
Innovation Solution
A method and system that adapt to voltage limited power intervals at different temperatures by calculating power limit coefficients in real time using cell voltage extreme values and voltage limited power intervals, improving power control accuracy and battery protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the voltage-segmented power limit method is used with fixed voltage intervals and power limit coefficients, then the power limit protection is simplified, but the power limit accuracy deteriorates and inconsistent power limitation occurs
Solution Approach 1:
The patent transforms the static fixed voltage interval method into a dynamic adaptive method. The voltage intervals and power limit coefficients are no longer fixed but dynamically adjusted based on real-time battery temperature data. The system automatically adapts the voltage limited power intervals according to temperature conditions, ensuring accurate power limitation across varying operating conditions without requiring complex manual configuration.
Solution Approach 2:
The patent changes the key parameters (voltage intervals and power limit coefficients) from fixed values to temperature-dependent variable values. By introducing temperature as a controlling parameter, the system automatically selects appropriate voltage intervals and power limit coefficients based on current temperature conditions, thereby improving power limit accuracy while maintaining system simplicity.
2Ease of operation
If the voltage-segmented power limit method is used with fixed power limit coefficients, then the control process is simplified, but the battery protection deteriorates due to overly limited or insufficient power limitation
Solution Approach 1:
The patent modifies the power limit coefficient from a fixed parameter to a temperature-adaptive parameter. The system automatically adjusts the power limit coefficient based on real-time temperature measurements, ensuring that the battery receives appropriate protection levels under different thermal conditions. This maintains ease of operation while significantly improving battery protection reliability.
Solution Approach 2:
The patent introduces a feedback mechanism where the system continuously monitors battery temperature and automatically adjusts the voltage intervals and power limit coefficients accordingly. This closed-loop control ensures that the battery protection adapts to changing conditions, preventing both overly limited and insufficient power limitation scenarios.
3Ease of manufacture
If the voltage intervals and power limit coefficients are manually selected, then the method is easier to implement, but the adaptability to different temperatures deteriorates
Solution Approach 1:
The patent enables the system to automatically select and adapt voltage intervals and power limit coefficients based on real-time temperature data without requiring manual intervention. The battery management system performs self-adjustment by monitoring temperature conditions and automatically configuring appropriate parameters, thereby achieving both ease of implementation and high temperature adaptability.
Solution Approach 2:
The patent transforms the manually-selected fixed parameters into automatically adjusted temperature-dependent parameters. The system changes the voltage interval boundaries and power limit coefficient values based on current temperature measurements, ensuring optimal adaptability across different temperature conditions while maintaining simple implementation through automated parameter selection.
Data Source
AI summary
A method and system for protecting a battery power limit, and a storage medium are disclosed. The method for protecting a battery power limit is applied to a vehicle with a battery management system. The method includes: acquiring temperature data, a state of charge, and a cell voltage extreme value of a battery, periodically; calculating a current maximum available power according to the temperature data and the state of charge; determining a power limit coefficient according to the cell voltage extreme value, and a voltage limited power interval corresponding to the temperature data; and obtaining an actual available power that the battery management system allows the vehicle to use according to the maximum available power and the power limit coefficient. According to the method, different temperature ranges can be adapted according to logic.