Battery Pulsed Heating Parameters to Prevent Li Plating
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Solution Overview
Problem
Lithium-ion batteries perform poorly in low temperature environments, leading to energy loss, reduced life cycle, and safety risks due to increased impedance and potential Li plating during pulsed heating.
Innovation Solution
A method and system for determining optimal pulsed heating parameters by monitoring the anode's reference potential relative to a threshold, adjusting parameters to avoid Li plating, and recording suitable heating parameters to ensure battery safety and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pulsed heating current is applied to heat the battery in low temperature environment, then the battery temperature increases and performance improves, but Li plating may occur on the anode which adversely affects battery life and safety
Solution Approach 1:
The patent implements a feedback control mechanism by continuously monitoring the anode potential during pulsed heating and using this information to adjust heating parameters. The control unit receives real-time anode potential data and dynamically adjusts the pulsed heating current to maintain the anode potential above the Li plating threshold, thereby preventing Li plating while achieving effective heating.
Solution Approach 2:
The patent changes the heating parameters (current amplitude, pulse width, duty cycle) based on the monitored anode potential. When the anode potential approaches the Li plating threshold, the system adjusts these parameters to reduce heating intensity or modify the heating pattern, thus preventing Li plating while still achieving the desired temperature increase.
2Productivity
If higher heating parameters are used to achieve faster heating, then heating efficiency improves, but the risk of Li plating and battery damage increases
Solution Approach 1:
The patent employs dynamic adjustment of heating parameters based on real-time anode potential monitoring. Instead of using fixed high heating parameters, the system continuously adapts the heating intensity to the current battery state, allowing high heating efficiency when safe and reducing heating intensity when Li plating risk is detected.
Solution Approach 2:
The system uses feedback from anode potential monitoring to dynamically control heating parameters. The control unit adjusts the heating power in real-time based on the monitored potential, ensuring that heating efficiency is maximized only when the anode potential remains above the Li plating threshold.
3Device complexity
If traditional heating methods are used without monitoring anode potential, then the system complexity is low, but it is impossible to determine safe heating parameters that prevent Li plating
Solution Approach 1:
The patent introduces a reference electrode as an intermediary element to indirectly measure the anode potential. This reference electrode works together with the working electrode to provide real-time potential information without significantly complicating the overall system, enabling safe heating parameter determination through electrochemical measurement.
Solution Approach 2:
The patent replaces complex mechanical or thermal monitoring systems with an electrochemical measurement approach. By measuring the anode potential through electrochemical means (using reference and working electrodes), the system can determine safe heating parameters more directly and with less complexity than would be required by purely thermal or mechanical sensing methods.
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
Ensures pulsed heating parameters do not adversely affect battery life by preventing Li plating, thereby maintaining performance and safety.
Implementation Method 1
the battery can be effectively heated by the pulsed heating method prior to its working cycle
Implementation Method 2
obtaining the reference potential of the anode of the lithium-ion battery in real time in the positive and negative pulsed heating process, where the reference potential of the anode is the voltage difference between the anode of the lithium-ion battery and the reference electrode
Data Source
AI summary
The present application relates to a method and system for determining parameters of battery pulsed heating. The reference potential of the anode of the lithium-ion battery is obtained in real time in the positive and negative pulsed heating process under various heating parameters. The relationship between reference potential and threshold potential indicates whether Li plating has occurred to the lithium-ion battery. When the reference potential is smaller than the threshold potential, the first heating parameters are adjusted to avoid Li plating and improve battery life. By recording the heating parameters when the reference potential is greater than the threshold potential, it can be ensured that the pulsed heating parameters have no significant impact on the life of the battery.