Lithium-Ion Cell Frame Sensors for Localized Deterioration Detection
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Solution Overview
Problem
Lithium ion batteries often malfunction locally, making it difficult to identify the faulty part, leading to unnecessary replacement of the entire battery.
Innovation Solution
Incorporating an electronic component, such as a sensor, within a frame member between the positive and negative current collectors to detect internal conditions, allowing for the identification of malfunctioning areas by measuring potential transitions and variations during recharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no electronic component is disposed in the frame member, then the device complexity is low, but the measurement precision of internal conditions is insufficient
Solution Approach 1:
A frame member is introduced as an intermediary structure between the positive and negative current collectors. This frame member serves as a carrier for electronic components (sensors) that detect internal conditions of the battery cell, enabling precise measurement without directly modifying the electrode structures.
Solution Approach 2:
The frame member performs multiple functions: it provides structural support within the cell, serves as a mounting platform for electronic sensors, and enables electrical connection between sensors and external monitoring systems. This multi-functionality reduces the need for separate components.
2Reliability
If the entire battery is replaced without identifying the malfunctioning part, then the reliability is maintained, but the loss of substance and loss of time increase
Solution Approach 1:
The battery system is segmented into monitorable units through the placement of multiple sensors at different positions within the cell. This segmentation enables identification of specific malfunctioning regions, allowing replacement of only the affected portions rather than the entire battery assembly.
Solution Approach 2:
Sensors continuously monitor internal conditions (potential, temperature) and provide feedback signals that indicate the health status of different cell regions. This feedback mechanism enables early detection of malfunctions and precise localization of problematic areas.
3Measurement precision
If multiple electronic components are disposed at different positions in the frame member, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Different sensor types are placed at specific positions within the cell based on local requirements. For example, potential sensors are positioned to detect voltage variations at critical locations, while temperature sensors are placed where thermal issues are most likely to occur. This localized sensor placement optimizes measurement precision without unnecessarily increasing complexity.
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
Enables accurate detection and specification of malfunctioning portions within the battery, facilitating targeted repairs and extending the battery's lifespan by allowing for the reuse of functional components.
Implementation Method 1
the electronic component disposed in the frame member is a sensor for measuring potential transition during a recharge
Implementation Method 2
the electronic component is a sensor which measures potential, and characterized by detecting a potential variation at different positions in the cell
Data Source
AI summary
A lithium ion battery including a cell formed by sequentially stacking a positive current collector, a positive active material layer, a separator, a negative active material layer, and a negative current collector, the lithium ion battery being characterized by including a frame member disposed between the positive current collector and the negative current collector to seal the positive active material layer, the separator, and the negative active material layer, the frame member having, disposed therein, an electronic component for detecting an internal condition of the cell.