Battery AC Heating Frequency Control to Prevent Lithium Plating
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Solution Overview
Problem
Power batteries face reduced discharge capacity and inability to charge in low-temperature environments, necessitating effective heating methods to maintain functionality.
Innovation Solution
A battery heating method that determines an optimal frequency for an alternating-current heating current based on polarization parameters and peak current to prevent amplitude exceeding the peak current, avoiding damage and lithium plating, using a heating circuit connected to the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high current is used for heating the battery, then heating efficiency is improved, but the amplitude may exceed the peak current capacity causing damage to heating circuit components
Solution Approach 1:
The patent applies dynamics by making the heating current frequency adjustable rather than fixed. The control device dynamically adjusts the frequency of the alternating current based on real-time battery polarization parameters (internal resistance and capacitance) to optimize heating efficiency while keeping the current amplitude within the peak current capacity of the heating circuit. This dynamic adjustment allows the system to achieve high heating efficiency without exceeding component limits.
2Speed
If high current is applied to heat the battery quickly, then heating speed is improved, but lithium plating may occur exceeding the equilibrium potential
Solution Approach 1:
The patent implements feedback control by continuously monitoring the battery's polarization parameters (internal resistance and capacitance) during the heating process. The control device uses this feedback information to adjust the frequency of the heating current in real-time, ensuring that the polarization voltage remains below the equilibrium potential of the lithium plating reaction. This feedback mechanism enables fast heating while preventing lithium plating by adapting the current characteristics to the battery's instantaneous state.
Solution Approach 2:
The patent applies parameter changes by modifying the frequency of the alternating current based on the battery's polarization characteristics. By changing the frequency parameter according to the measured internal resistance and capacitance values, the system optimizes the heating effect while controlling the polarization voltage to prevent lithium plating. This parameter adjustment allows the battery to be heated efficiently without causing harmful side reactions.
3Productivity
If alternating current frequency is not optimized, then heating efficiency is reduced, but determining optimal frequency requires complex calculations
Solution Approach 1:
The patent applies self-service by enabling the control device to automatically determine the optimal heating frequency based on real-time measurements of the battery's polarization parameters. The system performs the necessary calculations using the measured internal resistance and capacitance values along with the peak current capacity, and automatically adjusts the frequency without requiring external intervention or complex manual calculations. This self-service approach simplifies the operation while achieving optimal heating efficiency.
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
The method achieves high heating efficiency while ensuring safety by preventing lithium plating and damage to components, effectively warming power batteries in low-temperature conditions.
Implementation Method 1
the heating circuit is connected to a battery and is configured to output a heating current to the battery, and the heating current is configured to heat the battery
Data Source
AI summary
The present application provides a battery heating method, heating apparatus, and heating system, which can effectively heat a power battery, thereby achieving a high heating efficiency. The heating method is applied to a heating circuit, the heating circuit is connected to a battery and is configured to output a heating current to the battery, and the heating current is configured to heat the battery. The heating method comprises: acquiring polarization parameters of a battery; determining a frequency of the heating current according to the polarization parameters and a peak current of the heating circuit, so that the amplitude value of the heating current does not exceed the peak current; and controlling the heating circuit to output the heating current having the frequency to the battery.