Parallel Battery Cell Fault Detection During Discharge
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Solution Overview
Problem
In parallel connected battery systems, disconnection of a specific cell due to an open parallel connection line or a CID operation can lead to overcurrent flow in remaining cells, causing overloading, cell deterioration, and reduced battery performance and lifespan.
Innovation Solution
A method and system for detecting connection failure in parallel connected battery cells, involving reference data acquisition during CID operation or parallel connection line open conditions, real-time monitoring of discharge data, and comparison to detect cell disconnection due to CID operation or open parallel connection line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery cells are connected in parallel to increase power and capacity, then the battery can provide higher power for medium and large devices, but connection failure of a specific cell can cause overcurrent in remaining cells leading to overloading and cell deterioration
Solution Approach 1:
The patent implements a monitoring system that continuously measures voltage across each parallel-connected battery cell and compares it against reference voltage values. When a voltage deviation exceeding a predetermined threshold is detected, the system generates a warning signal to alert operators of potential connection failures. This feedback mechanism enables real-time detection of connection issues before they progress to overcurrent conditions and cell deterioration, resolving the contradiction by maintaining connection reliability while preserving the high power capability of parallel configurations.
2Reliability
If a CID operation or open parallel connection line causes cell disconnection, then the protection element operates to prevent overcharging, but overcurrent flows through remaining normal battery cells causing overloading
Solution Approach 1:
The patent establishes reference voltage values for each battery cell during normal operation before any failure occurs. These reference values serve as baseline data for detecting connection failures. When a CID operation or open connection occurs, the system compares current voltage measurements against these pre-established references and can detect the resulting voltage deviations that indicate cell disconnection. This preliminary establishment of reference data enables early detection of connection failures before overcurrent conditions develop, allowing protective actions to be taken that prevent overloading of remaining cells while maintaining the CID protection function.
3Reliability
If cell disconnection occurs due to open parallel connection line or CID operation, then the protection element cuts off current, but the remaining battery cells experience overcurrent flow leading to cell deterioration and reduced lifespan
Solution Approach 1:
The monitoring system continuously measures voltage across each parallel-connected battery cell and compares it against reference voltage values. When a voltage deviation exceeding a predetermined threshold is detected, the system generates a warning signal to alert operators of potential connection failures. This feedback mechanism enables real-time detection of connection issues before they progress to overcurrent conditions and cell deterioration, resolving the contradiction by maintaining connection reliability while preserving the high power capability of parallel configurations.
Solution Approach 2:
The system applies preliminary anti-action by establishing reference voltage values during normal operation before any failure occurs. These reference values serve as baseline data for detecting connection failures. When a CID operation or open connection occurs, the system compares current voltage measurements against these pre-established references and can detect the resulting voltage deviations that indicate cell disconnection. This preliminary establishment of reference data enables early detection of connection failures before overcurrent conditions develop, allowing protective actions to be taken that prevent overloading of remaining cells while maintaining the CID protection function.
Data Source
AI summary
Disclosed is a method and system for detecting connection failure of a parallel connection cell, and for a battery that is being discharged by the operation of an external device, by detecting whether there is a section matching the amount of change in the discharge voltage value when a cell connection failure condition occurs due to a pre-prepared current interruption device (CID) operation or an open parallel connection line from the change in the discharge voltage value of the battery being discharged.