Battery Pack Sensing-Line Defect Detection by 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 utilize voltage deviation analysis to distinguish between temporary and permanent connection defects in sensing lines, activating temporary protection functions for temporary faults and permanent protection functions for persistent issues, thereby preventing unnecessary disposal of healthy battery packs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery management systems detect connection defects in sensing lines, then connection reliability is improved, but healthy battery packs are rendered unusable due to unnecessary permanent failure protection activation
Solution Approach 1:
The protection function is segmented into two distinct types: temporary protection function and permanent protection function. The BMS selectively activates the appropriate protection level based on the nature of the detected defect, allowing healthy battery packs to remain operational while still providing protection when necessary.
Solution Approach 2:
The system changes the parameter of protection duration from always permanent to variable (temporary or permanent) based on the defect characteristics. This parameter change allows the system to maintain high availability by using temporary protection for transient issues while reserving permanent protection for genuine failures.
2Reliability
If permanent failure protection function is activated for all connection defects, then safety is improved, but disposal costs increase due to unnecessary battery pack replacement
Solution Approach 1:
The protection function is divided into temporary and permanent categories, allowing the system to apply the appropriate level of protection based on the defect nature. This segmentation prevents unnecessary permanent protection activation for transient defects, reducing battery pack disposal.
Solution Approach 2:
The BMS continuously monitors sensing line connection status and provides feedback to determine whether to activate temporary or permanent protection. This feedback mechanism enables the system to distinguish between transient and persistent defects, activating permanent protection only when truly necessary.
3Measurement precision
If voltage deviation analysis is used to distinguish temporary and permanent defects, then measurement precision is improved, but system complexity increases
Solution Approach 1:
The battery management system uses its existing voltage measurement and calculation capabilities to perform defect analysis. The BMS leverages its built-in functions for measuring overall battery voltage and cell bank voltages, calculating voltage deviations without requiring external specialized equipment.
Solution Approach 2:
The system analyzes changes in voltage deviation parameters over time to distinguish between temporary and permanent defects. By monitoring how voltage deviation evolves, the BMS can identify defect patterns and determine the appropriate protection level without complex additional hardware.
Data Source
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.