Lithium-Ion Battery Evaluation Using Lithium Precipitation State
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery evaluation systems fail to accurately assess the safety of lithium-ion batteries, as they do not consider critical safety-related indices such as lithium precipitation state, leading to potentially unsafe batteries receiving high evaluations.
Innovation Solution
A battery evaluation system that includes a battery monitoring unit to monitor the battery state and calculate the lithium precipitation amount, which is then used by an evaluation device to determine the safety of the storage battery based on this index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional battery evaluation systems are used, then the evaluation process is simple, but the safety assessment is inaccurate because critical safety indices like lithium precipitation state are not considered
Solution Approach 1:
The evaluation system is segmented into distinct functional modules: a monitoring unit that calculates lithium precipitation amounts based on voltage and temperature data, and an evaluation unit that integrates this safety index with other battery parameters. This segmentation allows the complex safety assessment to be broken down into manageable, specialized components that can be implemented systematically.
Solution Approach 2:
The system performs preliminary calculation of the lithium precipitation amount before the final safety evaluation. By pre-calculating this critical safety index from voltage and temperature measurements during battery operation, the system prepares safety data in advance, enabling more accurate and timely safety assessments without adding significant complexity to the overall evaluation process.
2Reliability
If lithium precipitation amount is calculated and considered in evaluation, then the safety determination becomes accurate, but the monitoring and evaluation process becomes more complex
Solution Approach 1:
The monitoring unit serves multiple functions: it calculates lithium precipitation amounts based on voltage and temperature data, and this same unit can potentially assess other battery states. By making the monitoring unit multi-functional, the system avoids adding separate dedicated devices for each measurement, thereby improving reliability without proportionally increasing system complexity.
Solution Approach 2:
The system uses existing battery operational data (voltage and temperature measurements already taken during normal operation) to calculate the lithium precipitation amount. Rather than requiring additional sensors or external measurement equipment, the system self-generates the safety index from data it already collects, improving reliability while minimizing added complexity.
Data Source
AI summary
The battery evaluation system is a system for evaluating a storage battery including a lithium-ion battery. The battery evaluation system includes a battery monitoring unit that monitors a battery state of the storage battery, and an evaluation device that acquires battery state information including a monitoring result of the battery state from the battery monitoring unit and evaluates the storage battery based on the battery state information. The battery monitoring unit calculates a lithium precipitation amount in the lithium-ion battery as one index indicating the battery state. The evaluation device determines safety of the storage battery based on the lithium precipitation amount.