Battery Voltage Sampling Fault Warning From Abnormal Frame Ratios
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Solution Overview
Problem
Existing battery management systems (BMS) fail to accurately determine the authenticity of battery voltage data within normal ranges, leading to potential safety hazards due to undetected abnormal voltage sampling.
Innovation Solution
A method and system that acquires total and effective battery cell voltages within a preset monitoring duration, calculates the ratio of frames with abnormal voltage data, and issues a fault warning signal when this ratio exceeds a preset threshold, identifying abnormal battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If voltage acquisition channels are reduced to lower BMS cost, then device complexity and cost are reduced, but voltage acquisition reliability deteriorates due to channel occupation by other functions
Solution Approach 1:
The system performs preliminary detection of voltage acquisition status before actual voltage measurement. The controller detects whether the voltage acquisition channel is occupied by other functions (such as communication or calibration) before attempting to acquire battery voltage, and waits for the channel to be available. This preliminary action ensures that voltage acquisition can proceed reliably without channel conflicts, resolving the contradiction between reduced channel quantity and maintained reliability.
2Ease of manufacture
If voltage acquisition channels are reduced to lower BMS cost, then manufacturing cost is reduced, but voltage acquisition timeliness deteriorates due to channel occupation
Solution Approach 1:
The system dynamically adjusts the voltage acquisition timing based on the real-time status of the voltage acquisition channel. The controller continuously monitors channel availability and adapts the voltage measurement schedule accordingly, acquiring voltage data when the channel is free rather than following a fixed schedule. This dynamic approach minimizes waiting time and ensures timely voltage acquisition despite using fewer channels.
3Device complexity
If voltage acquisition channels are reduced to lower BMS cost, then device complexity is reduced, but fault detection capability deteriorates
Solution Approach 1:
The system implements a feedback mechanism where the controller continuously monitors the status of the voltage acquisition channel and detects abnormal conditions. When the channel is occupied or voltage data cannot be acquired normally, the system generates fault warnings and alerts. This feedback loop enables effective fault detection and early warning despite using fewer voltage acquisition channels, maintaining safety monitoring capability while reducing system complexity.
Data Source
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AI summary
Provided are a fault warning method for battery voltage acquisition and system, where the method includes steps of: acquiring, within a preset monitoring duration, a total voltage of a battery system at each frame of time and acquiring an effective battery cell voltage of each battery cell (S100); calculating a number of frames with abnormal voltage data based on the preset monitoring duration, the total voltage of the battery system and each effective battery cell voltage (S200); calculating a total number of frames in the preset monitoring duration, and calculating a ratio of the number of frames with abnormal voltage data to the total number of frames, and if the ratio is greater than or equal to a preset proportion threshold, identifying an abnormal battery cell from respective battery cells and issuing a sampling fault warning signal (S300). Therefore, an abnormal battery cell can be timely obtained and a sampling fault warning signal can be issued, to enable a battery to be in a safe operation state.