Battery Pack Sensing-Line Defect Detection via Voltage Deviation
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Solution Overview
Problem
Existing battery management systems inaccurately detect connection defects in sensing lines, leading to unnecessary activation of permanent failure protection functions, rendering healthy battery packs unusable and increasing disposal costs.
Innovation Solution
A method and system that calculates voltage deviations between cell banks and determines temporary or permanent connection defects in sensing lines, activating temporary or permanent protection functions accordingly to prevent false activations and ensure accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing battery management systems detect connection defects in sensing lines, then connection defects can be identified, but healthy battery packs are incorrectly rendered unusable due to inaccurate detection
Solution Approach 1:
The patent changes the detection parameter from simple voltage threshold comparison to voltage deviation analysis. By calculating the deviation between measured cell bank voltages and expected voltages (based on overall battery voltage distribution), the system achieves more accurate detection of actual connection defects while avoiding false positives that would incorrectly render healthy battery packs unusable.
2Reliability
If permanent failure protection function is activated upon detecting connection defects, then battery safety is improved, but false activations occur due to inaccurate detection leading to unnecessary disposal
Solution Approach 1:
The patent implements a feedback mechanism where the detected voltage deviations are continuously monitored and analyzed before triggering the permanent failure protection function. The system uses the calculated voltage deviations as feedback to verify actual connection defects, ensuring that the protection function is only activated when genuine defects are detected, thereby preventing false activations and unnecessary disposal of healthy battery packs.
Data Source
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AI summary
A method for detecting a connection defect in a sensing line includes measuring an overall voltage of a battery pack and a voltage of each of a plurality of cell banks included in the battery pack, calculating, based on the overall voltage and the voltage of each of the plurality of cell banks, a voltage deviation associated with each of the plurality of cell banks, and determining, based on the voltage deviation, one or more connection defects of at least one of a plurality of sensing lines associated with the plurality of cell banks.