Battery Cell Equalization with Separated Sampling Periods
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Solution Overview
Problem
Existing battery equalization methods in electric vehicles suffer from inaccurate equalization duration calculations due to fluctuations in battery information during the equalization process, leading to poor equalization effects and potential damage to the battery.
Innovation Solution
A method and system that separates battery information collection and equalization into separate periods in a unit cycle, using a control module to determine a target equalization duration based on voltage values and a preset duty cycle, ensuring accurate collection and efficient equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If battery information is collected in real-time during equalization process, then continuous monitoring is achieved, but measurement precision deteriorates due to fluctuations in battery information during equalization
Solution Approach 1:
The patent divides the unit time into two distinct segments: an equalization period for performing equalization and a sampling period for collecting battery information. This segmentation prevents interference between equalization currents and information collection, ensuring measurement precision while maintaining equalization efficiency through dedicated time allocation for each function.
2Reliability
If equalization is performed continuously, then equalization effect is improved, but battery information accuracy deteriorates due to fluctuations during equalization process
Solution Approach 1:
The patent implements periodic action by alternating between equalization periods and sampling periods in a cyclic manner. During equalization periods, equalization currents are applied to improve equalization effect; during sampling periods, battery information is collected without interference. This periodic alternation ensures both reliable equalization and accurate measurement.
3Measurement precision
If sampling period is extended to improve information accuracy, then measurement precision is improved, but equalization duration is reduced
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the unit time duration and the proportion of equalization period versus sampling period based on battery state and equalization requirements. This allows optimization of both measurement precision and equalization duration by modifying temporal parameters to match operational needs.
Data Source
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AI summary
The present application relates to a battery equalization method and system, a vehicle, a storage medium, and an electronic device. The method includes: obtaining a voltage value of a to-be-equalized cell in a battery pack; obtaining a reference voltage value required for equalization; determining a target equalization duration of the to-be-equalized cell according to a voltage value of the to-be-equalized cell, the reference voltage value, and a preset equalization duty cycle, where the equalization duty cycle is a ratio of an equalization period in a unit cycle to the unit cycle, and the unit cycle includes the equalization period and a sampling period; and controlling equalization of the to-be-equalized cell in the equalization period in the unit cycle according to the target equalization duration. According to this method, sampling is separated from equalization in a unit cycle, thereby ensuring accuracy of collected battery information, making the calculated equalization duration relatively accurate, and improving equalization effects of the battery pack.