Reference Cell Anode Potential Control for Cold-Charge Lithium Plating
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Solution Overview
Problem
Lithium plating during charging in battery cells, especially at low temperatures, reduces charging capacity and poses safety risks, as existing technologies lack efficient methods to monitor and manage lithium plating in real-time across varying cell temperatures within a battery system.
Innovation Solution
Incorporating a reference battery cell with a reference electrode to measure the anode potential relative to a reference electrode, generating signals to adjust charging current and voltage based on predetermined threshold voltages, ensuring that the anode potential remains above a threshold to prevent lithium plating, with reference cells placed at cold spots within the battery pack to monitor temperature-dependent risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging current is increased to maximize charging power, then charging speed improves, but lithium plating occurs at low temperatures reducing safety and charging capacity
Solution Approach 1:
The patent implements a feedback control system where the anode potential is continuously monitored during charging. When the anode potential drops below a predetermined threshold (indicating risk of lithium plating), the charging current is automatically reduced. This closed-loop feedback mechanism enables dynamic adjustment of charging parameters to prevent lithium plating while maximizing charging power under normal conditions.
Solution Approach 2:
The patent changes the charging current parameter dynamically based on the measured anode potential. By adjusting the charging current in real-time according to the anode potential threshold, the system optimizes charging power while preventing lithium plating at low temperatures.
2Reliability
If charging current is reduced to prevent lithium plating, then safety improves, but charging power decreases
Solution Approach 1:
The patent employs dynamic charging current adjustment rather than static current limitation. The charging current is continuously adapted based on real-time anode potential measurements, allowing the system to operate at high power when safe and reduce power only when necessary to prevent lithium plating.
Solution Approach 2:
The charging current parameter is changed dynamically based on anode potential threshold comparisons. This enables the system to maintain high charging power under normal conditions while automatically reducing current only when the anode potential indicates lithium plating risk, thus minimizing impact on charging speed.
3Measurement precision
If reference battery cells are placed at cold spots to monitor temperature-dependent lithium plating risks, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by placing reference battery cells specifically at cold spots within the battery pack where lithium plating is most likely to occur. This targeted placement ensures accurate monitoring of the most critical regions without the need for comprehensive monitoring of all battery cells.
Solution Approach 2:
The reference battery cell acts as an intermediary sensor that indirectly monitors the thermal and electrochemical conditions of the battery pack. By measuring anode potential in reference cells positioned at cold spots, the system infers lithium plating risks in the entire pack without directly monitoring all cells.
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
This approach effectively limits lithium plating, maximizes charging power, and enhances safety by dynamically adjusting charging parameters based on real-time anode potential measurements, optimizing battery performance and extending cell life even at low temperatures.
Implementation Method 1
An electrolyte solution may be injected into the case in order to enable charging and discharging of the battery via an electrochemical reaction of the positive electrode, the negative electrode, and the electrolyte solution
Data Source
AI summary
A battery system includes a non-reference battery cell; a reference battery cell including a cathode, an anode, and a reference electrode; a potential measuring means configured to measure a reference potential of the anode relative to the reference electrode, of the reference battery cell, and to generate a signal corresponding to the reference potential; and a controlling means configured to receive the signal and to reduce, during a charging process of the battery system, a charging current applied to the battery system when the signal indicates that the reference potential is below a predetermined threshold voltage. The non-reference battery cell may be disposed at a first position in the battery system, and the reference battery cell may be disposed at a second position in the battery system, the second position being a position that has a lowest temperature, among the first and second positions, during the charging process.