Battery Heating Loop Using Inverter-Motor AC Self-Heating
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Solution Overview
Problem
Existing heating systems for power batteries in electric vehicles are inefficient in low-temperature environments, leading to attenuated energy and power characteristics.
Innovation Solution
A heating system that includes an inverter, an alternating current motor, a first controller, and a connection line forming an alternating current self-heating loop, along with a heating device for thermoelectric conversion, to heat the power battery in two manners: self-heating through excitation current and external thermoelectric conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional heating systems are used for power batteries in low-temperature environments, then heating function is provided, but heating efficiency is low and energy and power characteristics are severely attenuated
Solution Approach 1:
The patent combines two heating methods into a unified heating system: AC self-heating (utilizing the motor and inverter to generate heat) and traditional resistive heating (using heating devices). The controller intelligently switches between or combines these methods based on temperature requirements, thereby improving overall heating efficiency while maintaining the ability to heat the battery in low-temperature environments
Solution Approach 2:
The system changes the heating parameters dynamically by using AC self-heating which can provide higher power output compared to traditional resistive heating. The controller adjusts the heating power and temperature parameters based on real-time battery temperature feedback, optimizing the heating process to improve efficiency while preventing overheating
2Power
If heating power is increased to improve energy and power characteristics, then heating effectiveness improves, but system complexity increases
Solution Approach 1:
The patent makes the motor and inverter serve dual purposes: driving the vehicle and providing heating function through AC self-heating. By utilizing existing components for multiple functions, the system achieves high heating power without significantly increasing overall system complexity, as the motor and inverter are already essential components of the electric vehicle
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 system achieves a more uniform heating effect for the power battery, improving its energy and power characteristics in low-temperature environments.
Implementation Method 1
at least one heating device is connected in the connection line, and the heating device is configured to heat the first battery core group and/or the second battery core group
Implementation Method 2
the first battery core group, the second battery core group, the inverter, the alternating current motor, and the connection line form an alternating current self-heating loop
Data Source
AI summary
A heating system for heating a battery, includes an inverter including three bridge arms, an alternating current motor, a first controller, and a connection line. A positive electrode of the battery connects to upper bridge arms of the inverter. A negative electrode of the battery connects to lower bridge arms of the inverter. Midpoints of the three bridge arms connects to head ends of three coils of the alternating current motor respectively. Tail ends of the three coils connects together as a neutral point. A first end of the connection line connects to the neutral point, and a second end of the connection line connects to the battery. The first controller inputs a drive signal to the inverter. The battery, the inverter, the alternating current motor, and the connection line form an alternating current self-heating loop. A heating device connects to the connection line, and heats the battery.