Battery Cell Balancing with Voltage Deviation Feedback
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Solution Overview
Problem
Existing battery cell balancing methods struggle to effectively monitor and verify the performance of cell balancing operations, leading to potential over-discharge or over-charge issues that can degrade battery packs and reduce their lifespan, and fail to detect abnormal situations post-balancing control.
Innovation Solution
A method and system for battery cell balancing that includes entry condition checking, detecting battery banks requiring balancing, recording and comparing voltage deviations before and after balancing, and generating notifications for failed balancing operations, ensuring that cell balancing is only terminated when voltage deviations are within a prescribed range, thereby improving reliability and enabling proactive measures for abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If typical cell balancing manners (first to third) are used to balance battery cells, then voltage differences between battery cells can be adjusted within a prescribed range, but it is difficult to check the balancing performance result and verify if balancing is truly achieved
Solution Approach 1:
The patent implements a feedback mechanism by recording the voltage deviation before balancing starts, performing the balancing operation, then recording the voltage deviation after balancing ends. The system compares the before and after voltage deviations to determine whether balancing was successfully achieved. This closed-loop feedback approach allows verification of balancing performance results, resolving the contradiction between achieving voltage balance and verifying balancing effectiveness.
2Productivity
If cell balancing is performed without monitoring abnormal situations, then the balancing process can be completed, but information about abnormal battery situations that may occur after balancing control cannot be detected
Solution Approach 1:
The patent records the voltage deviation before balancing starts as a reference value, then performs balancing operations. After balancing, it records the voltage deviation again and compares it with the pre-balancing reference. This preliminary recording of baseline data enables post-balancing verification and abnormality detection, allowing the system to identify when balancing fails or when abnormal situations occur after balancing control.
3Ease of operation
If voltage deviation is not monitored and compared before and after balancing, then the balancing process can proceed without complex monitoring, but it is impossible to determine whether balancing was successfully achieved
Solution Approach 1:
The system implements a straightforward feedback mechanism: record voltage deviation before balancing, perform balancing, record voltage deviation after balancing, and compare the two values. If the after-balancing voltage deviation is less than or equal to the before-balancing voltage deviation, balancing is considered successful. This simple comparison approach maintains ease of operation while enabling accurate balancing result verification.
Data Source
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AI summary
The present disclosure relates to a method and system for stabilizing a battery through cell balancing of a battery pack, and more particularly, to a method and system for performing battery cell balancing and determining a control situation through a feedback for the cell balancing, thereby improving reliability for the battery cell balancing and enabling a proactive measure for a battery abnormality