Battery Heating via Inverter Pulse Current and Motor Winding Energy
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Solution Overview
Problem
Existing battery heating methods in low temperature environments are inefficient, as the heat generated by motor loss is not sufficient to maintain the battery temperature within the required range for normal operation.
Innovation Solution
A battery heating system that utilizes the energy stored in the motor winding to output a pulse current to the battery through an inverter, forming a freewheeling loop to charge back energy and generate heat, thereby maintaining the battery temperature within the required range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If motor-generated heat is used to heat the battery, then the battery temperature can be maintained, but the heating effect is not obvious and the battery temperature is difficult to effectively maintain
Solution Approach 1:
The battery heating system utilizes the battery itself as the heat source through pulse current heating. The control device controls the inverter to output pulse currents to the battery, making the battery heat itself through internal resistance, thereby achieving efficient heating without relying on external motor-generated heat
Solution Approach 2:
The system changes the electrical parameters by outputting pulse currents with specific duty cycles and frequencies to the battery. By adjusting the pulse current parameters, the heating power is controlled to efficiently raise and maintain battery temperature within the optimal range
2Loss of energy
If pulse current is output to heat the battery, then heating efficiency is improved, but the motor operation may be affected
Solution Approach 1:
The control device outputs pulse currents to the battery in periodic intervals rather than continuously. During motor operation phases, pulse heating is suspended or reduced, while during idle or low-load phases, pulse heating is activated. This periodic action ensures motor operation stability while achieving effective battery heating over time
Solution Approach 2:
The system dynamically adjusts the pulse current output based on real-time motor operation status and battery temperature. When motor performance requirements are high, pulse heating is reduced or paused; when motor load is low or battery temperature is insufficient, pulse heating is enhanced, achieving dynamic balance between motor operation and battery heating
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 achieves high-efficiency heating of the battery by utilizing its own generated heat, ensuring its temperature remains within the operational range without affecting motor performance.
Implementation Method 1
the heat generated inside the battery itself... high-efficiency heating of the battery is achieved by utilizing heat generated inside the battery itself
Data Source
AI summary
A control method for a battery heating system. The battery heating system includes an inverter and a motor winding, and the inverter is connected to the motor winding and a battery. The control method includes acquiring a target voltage vector required for motor operation; and controlling, according to the target voltage vector, the motor winding to output a pulse current to the battery through the inverter.