Power Battery Health Monitoring with Expansion Force and Electrode Thickness Sensors
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Solution Overview
Problem
There is a lack of real-time intelligent monitoring solutions for the health state of power battery cells, leading to potential safety hazards due to issues like over-charging, over-discharging, short-circuiting, and overheating.
Innovation Solution
A power battery system equipped with an expansion force sensor and an electrode sheet sensor to collect expansion forces and thickness variations of electrode sheets, respectively, allowing for real-time health assessment and monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring methods are used for power battery cells, then the device complexity is low, but the measurement precision and reliability of health state monitoring are insufficient
Solution Approach 1:
The monitoring system is segmented into multiple specialized sensors: expansion force sensors positioned at different thickness positions of the cell, and electrode sheet sensors. Each sensor type measures a specific parameter (expansion force or thickness), dividing the complex health monitoring task into manageable measurement components that can be independently optimized and positioned strategically within the battery structure.
2Reliability
If multiple sensors are deployed to monitor different parameters of the cell, then the reliability of safety monitoring is improved, but the device complexity increases
Solution Approach 1:
Multiple sensor types (expansion force sensors and electrode sheet sensors) are merged into a unified monitoring system that collectively assesses cell health. The sensors are integrated at different thickness positions of the cell, combining their measurements to provide comprehensive safety monitoring that covers multiple failure modes simultaneously, thereby improving reliability while managing system complexity through coordinated integration.
3Loss of information
If real-time monitoring of expansion force and electrode sheet thickness is implemented, then the ability to detect abnormal states is improved, but the loss of energy for operation increases
Solution Approach 1:
The sensor system operates with minimal external energy input by leveraging the natural physical properties of the battery cell. Expansion force sensors and electrode sheet sensors passively detect changes in the cell structure during normal charging and discharging cycles, utilizing the cell's own operational states to generate measurable signals without requiring additional energy-intensive active probing or stimulation mechanisms.
Data Source
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AI summary
The present disclosure relates to a power battery, a health evaluation method and a health evaluation device thereof. The power battery includes a cell, an expansion force sensor and an electrode sheet sensor. The cell includes electrode sheets. The expansion force sensor is electrically connected to the cell, and is configured to collect expansion forces at different thickness positions of the cell, and assess a health state of the power battery according to the expansion forces. The electrode sheet sensor is electrically connected to the cell, and is configured to collect the thicknesses of the electrode sheets at different thickness positions of the cell, and assess the health state of the power battery according to the thicknesses of the electrode sheets.