Battery Electrode Monitoring for Lithium Plating and Overheating
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Solution Overview
Problem
Existing battery monitoring systems fail to effectively predict and prevent lithium plating and overheating conditions in lithium ion battery packs, which can lead to safety issues and reduced performance.
Innovation Solution
A vehicle battery monitoring system using equivalent circuit models for anodes, cathodes, and separators to determine voltage responses and heat generation, coupled with a vehicle control module that adjusts charging current and coolant supply based on these models to prevent lithium plating and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging current is increased to improve charging speed, then productivity is improved, but lithium plating and overheating conditions occur reducing reliability
Solution Approach 1:
The system performs preliminary monitoring of anode voltage, cathode voltage, and temperature before lithium plating or overheating conditions fully develop. By detecting voltage responses and heat generation in advance, the control module can proactively adjust charging current to prevent harmful conditions while maintaining high charging speeds.
Solution Approach 2:
The system continuously monitors battery parameters (anode voltage, cathode voltage, temperature) and uses this feedback to dynamically adjust charging current. The control module modifies charging current based on real-time voltage responses from equivalent circuit models and actual temperature measurements, creating a closed-loop control system that prevents lithium plating and overheating while maximizing charging speed.
2Reliability
If monitoring of individual components (anode, cathode, separator) is implemented to improve reliability, then device complexity increases
Solution Approach 1:
The control module serves multiple functions: it monitors anode voltage, cathode voltage, temperature, and controls charging current adjustment all through a single integrated unit. The equivalent circuit models for anode, cathode, and separator are processed by the same control module, reducing the need for separate dedicated monitoring systems for each component and thereby limiting the increase in device complexity.
Solution Approach 2:
The equivalent circuit models act as intermediaries between the physical battery components and the control module. Instead of directly complex sensor networks for each component, the system uses electrical equivalent circuit models (RC models) to represent and monitor the state of anode, cathode, and separator, simplifying the monitoring architecture while maintaining reliable detection of lithium plating and overheating conditions.
Data Source
AI summary
A vehicle battery monitoring system includes a drive unit including an electric motor to rotate wheels of a vehicle, at least one battery module configured to supply power to the electric motor, the at least one battery module including a cathode, an anode, and a separator between the anode and the cathode, a memory configured to store a cathode equivalent circuit model, an anode equivalent circuit model and a separator equivalent circuit model, and a vehicle control module configured to determine a cathode voltage response of the cathode using the cathode equivalent circuit model, determine an anode voltage response of the anode using the anode equivalent circuit model, determine a separator voltage response of the separator using the separator equivalent circuit model, and modify a charging current supplied to the at least one battery module based on the cathode voltage response, the anode voltage response, and the separator voltage response.