Battery Electrolyte AC Heating for Low-Temperature Performance
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Solution Overview
Problem
Current battery technologies face significant performance degradation and charging limitations at low temperatures, particularly for lithium-ion and lithium-polymer batteries, which reduces their capacity and lifespan when operated in cold environments.
Innovation Solution
A high-frequency AC current system is used to directly heat the battery electrolyte, optimizing its temperature and maintaining performance without damaging the batteries, applicable to various battery types including lithium-ion, lithium-polymer, NiMH, lead-acid, and super-capacitors, even at temperatures as low as -54°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating methods (heaters, heating blankets, embedded heating elements) are used to heat batteries at low temperatures, then the battery temperature can be increased, but the system complexity increases and energy consumption increases
Solution Approach 1:
The battery itself serves as the heating element by utilizing its internal resistance to generate heat through controlled current flow. The method employs a self-regulating heating process where the battery's own electrical properties are exploited to warm the electrolyte, eliminating the need for external heating devices, blankets, or embedded heating elements. This self-service approach reduces system complexity while achieving effective heating at low temperatures.
2Temperature
If conventional heating methods are used to heat batteries, then the battery temperature can be increased, but energy consumption increases
Solution Approach 1:
The battery utilizes its own stored electrical energy and internal resistance to generate heat, rather than requiring external energy sources. The controlled current flow through the battery electrolyte converts electrical energy directly into thermal energy within the battery itself, achieving heating with minimal additional energy consumption beyond what is already present in the system.
3Loss of energy
If high frequency AC current is used to heat battery electrolyte, then heating efficiency is improved and energy consumption is reduced, but the frequency determination complexity increases
Solution Approach 1:
The system employs feedback mechanisms to monitor and determine the optimal frequency for AC current application. By measuring the battery's electrical characteristics and monitoring heating effectiveness, the system automatically adjusts the AC current frequency to maximize heating efficiency. This feedback-driven approach simplifies frequency determination by using real-time data from the battery itself rather than requiring complex pre-calculation or external measurement equipment.
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 method efficiently and safely heats batteries to their optimal operating temperature, extending their lifespan and maintaining performance in cold conditions, requiring no modifications to the batteries and using less energy than traditional heating methods, while ensuring uniform heating and minimizing heat loss.
Implementation Method 1
A high-frequency AC current system is used to directly heat the battery electrolyte
Data Source
AI summary
System for direct battery electrolyte and supercapacitor heating and temperature maintenance at low temperatures when coupled to a battery and/or supercapacitor having a core with an electrolyte having ions therein and having inputs, with one of the inputs having characteristics of a frequency-dependent resistor and inductor series coupled to a voltage source, the device including: at least one power storage and source couplable to the one input; and a controller configured to control the power storage and source to provide alternating between a positive input current and a negative input current at the one input, wherein the controller is configured to control the power storage and source to provide the alternating positive and negative input currents at a high-frequency configured to substantially maximize an internal heating effect of the ions within the electrolyte to generate heat and raise a temperature of the electrolyte.