Lithium Ion Battery Safety Evaluation via Voltage Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for evaluating the safety of lithium ion batteries, particularly their overcharging endurance ability, are inaccurate due to variations in structural designs and environmental conditions, making it difficult to compare temperature data from different batteries.
Innovation Solution
A method involving setting a reference voltage value based on the cathode active material, overcharging the battery while recording the maximum voltage before the first decrease, and comparing it to evaluate the safety of the lithium ion battery, which is not affected by structural designs or environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If temperature-based evaluation methods are used to assess lithium ion battery safety, then the evaluation process is simple, but the accuracy and comparability of results are poor due to structural and environmental variations
Solution Approach 1:
The patent changes the evaluation parameter from temperature to voltage. By using voltage as the key parameter to assess overcharging endurance, the method eliminates the influence of structural design and environmental temperature variations, achieving both simplicity and accuracy in safety evaluation.
2Productivity
If temperature data from different batteries are compared, then safety evaluation can be performed, but the results cannot be accurately compared due to different structural designs and environmental conditions
Solution Approach 1:
The patent changes the measurement parameter from temperature to voltage. Voltage is an intrinsic property that reflects the electrochemical state of the battery and is not affected by structural design or environmental conditions, enabling reliable comparison across different battery types and conditions.
3Difficulty of detecting and measuring
If temperature testing is performed on different locations of the battery, then thermal runaway detection is possible, but the results vary due to different heat dissipation speeds
Solution Approach 1:
The patent changes the detection parameter from temperature to voltage. Voltage monitoring provides consistent and reliable data regardless of measurement location, as it directly reflects the electrochemical state without being influenced by heat dissipation variations at different positions.
Data Source
AI summary
A method for testing a lithium ion battery is disclosed. An under-test lithium ion battery including a cathode active material is provided. A reference voltage value is set according to the cathode active material. The under-test lithium ion battery is over charged, while an actual voltage change of the under-test lithium ion battery is tested during the over charging. A maximum voltage value is recorded before a first decrease in the actual voltage change of the under-test lithium ion battery during the over charging. The maximum voltage value is compared with the reference voltage value. A method for evaluating a safety of a lithium ion battery is also disclosed.