Lithium Deposition Sensor for Battery Safety
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Solution Overview
Problem
Current lithium ion secondary battery systems face challenges in achieving high reliability due to non-uniform charging, which can lead to lithium deposition and thermal instability, increasing the risk of ignition and reducing battery safety.
Innovation Solution
A lithium ion secondary battery system with a lithium deposition sensor that includes an endotherm detector, capable of detecting endotherm during constant current charging, allowing for the determination of lithium deposition and adjustment of charging conditions to prevent deposition, thereby enhancing safety and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-uniform charging is proceeded while increasing charging rate, then productivity is improved, but reliability deteriorates due to lithium deposition and thermal instability
Solution Approach 1:
The patent employs endotherm detection during constant current charging to provide real-time feedback on lithium deposition conditions. When endotherm is detected, the system adjusts charging parameters to prevent lithium deposition, thereby maintaining reliability while enabling high-rate charging. This feedback mechanism resolves the contradiction by dynamically controlling the charging process based on actual battery state.
Solution Approach 2:
The patent changes charging parameters (current, voltage, time) based on endotherm detection results. By adjusting these parameters in response to detected endotherm, the system prevents lithium deposition while maintaining high charging rates, thus resolving the contradiction between productivity and reliability.
2Reliability
If endotherm detection is implemented to detect lithium deposition, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical or electrical sensing systems with endotherm detection. By measuring thermal effects (endotherm) during charging, the system detects lithium deposition with a relatively simple thermal sensing approach, thus improving reliability while minimizing the increase in device 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
The system effectively detects lithium deposition and adjusts charging parameters to prevent thermal instability, improving safety and reliability by reducing the risk of ignition and ensuring stable battery operation.
Implementation Method 1
endotherm occurs with lithium (Li) deposition, and this endotherm is detected
Data Source
AI summary
Provided is a lithium ion secondary battery system having excellent reliability.Provided is a lithium ion secondary battery system including, at least a lithium ion secondary battery including a positive electrode and a negative electrode, and a lithium deposition sensor. In this lithium ion secondary battery system, the lithium deposition sensor includes an endotherm detector, and the endotherm detector detects endotherm in a constant current charging range.