Li-Ion Battery Health Monitoring via Cell Expansion Detection
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Solution Overview
Problem
Lithium ion batteries face challenges in determining the state of health (SOH) and preventing safety issues, such as thermal runaway and cell rupture, which makes them undesirable for large applications like UPS systems, despite their potential to replace lead acid batteries.
Innovation Solution
A safety apparatus for lithium ion battery modules that includes a health monitoring component to detect changes in battery cell shape, dimension, pressure, and force, transmitting signals to a safety protection component to disable the module operation, either by physical or electrical disconnection, and alerting for unhealthy conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium ion batteries are used to replace lead acid batteries, then energy density and lifecycle are improved, but safety problems and difficulty in determining state of health worsen
Solution Approach 1:
The patent implements preliminary safety actions by monitoring battery cell expansion before thermal runaway occurs. The system detects dimensional changes of individual cells using sensors (optical, capacitive, or inductive) and triggers protective measures such as isolating affected cells or shutting down the battery pack before dangerous conditions develop, thereby preventing safety incidents while maintaining high energy density
Solution Approach 2:
The patent establishes a feedback mechanism that continuously monitors battery cell health parameters including dimensional changes, voltage, and temperature. The system compares real-time measurements against threshold values and automatically adjusts battery operation or isolation strategies based on detected degradation patterns, enabling dynamic safety management that preserves the high energy density advantage of lithium ion batteries
2Duration of action of stationary object
If lithium ion batteries are used to replace lead acid batteries, then lifecycle is improved, but safety problems and difficulty in determining state of health worsen
Solution Approach 1:
The system performs preliminary detection of cell degradation through continuous monitoring of dimensional changes, voltage variations, and temperature patterns. By identifying aging cells before they become dangerous, the system can isolate problematic cells or reduce charging rates to extend the overall battery pack lifecycle while preventing safety incidents during extended operation
Solution Approach 2:
The patent implements a feedback-based lifecycle management system that tracks battery degradation over time. The system uses historical data from continuous monitoring to predict remaining useful life, adjust maintenance schedules, and modify operation parameters to extend battery lifespan while maintaining safety thresholds, thereby realizing both extended lifecycle and improved reliability
3Reliability
If battery cell expansion is monitored to detect degradation, then safety protection is improved, but device complexity increases
Solution Approach 1:
The patent uses intermediary sensors (optical, capacitive, or inductive) that indirectly measure cell dimensional changes without requiring direct physical contact with battery cells. These sensors act as mediators between the battery system and the monitoring electronics, simplifying the overall device architecture while enabling effective safety monitoring of cell expansion and degradation
Solution Approach 2:
The monitoring system is designed with multi-functional sensors and control circuits that can detect various degradation modes (expansion, contraction, swelling) using the same basic sensor platform. The control system integrates multiple safety functions including cell isolation, pack shutdown, and predictive maintenance planning within a single unified controller, reducing overall device complexity while comprehensive safety protection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents lithium ion battery module failures by enabling real-time monitoring and protection against degradation, reducing the risk of thermal runaway and ensuring safe operation, thereby making lithium ion batteries more suitable for large applications.
Implementation Method 1
The health monitoring component may further comprise an infrared sensor that is configured to detect displacement of the battery cell from expansion of the battery cell during degradation
Implementation Method 2
The health monitoring component may further comprise a pressure sensitive sensor that is configured to detect a change in pressure within an enclosure of the battery module from expansion of the battery cell during degradation
Data Source
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AI summary
One embodiment of safety apparatus for a lithium ion battery module comprises a health monitoring component configured to detect degradation of a battery cell within the lithium ion battery module and transmit an output signal; and a safety protection component configured to receive the output signal and at least disable operation of the lithium ion battery module.