Battery Preheating Circuit Using Motor and Bus Capacitor Switching
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Solution Overview
Problem
Existing battery pack preheating methods in vehicles are inefficient due to the difficulty in controlling separate motor driving and charging/discharging circuits, leading to reduced heating rates and current flow through the battery pack.
Innovation Solution
An energy conversion device with a motor controller, bus capacitor, first and second switch modules, and a motor, where the switch modules control the formation of separate motor driving and charging/discharging circuits to alternately perform discharging and charging processes, enhancing the heating efficiency of the battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the battery pack forms both charging/discharging circuit and motor driving circuit, then the circuit can be integrated, but the motor controller becomes difficult to control and heating rate decreases
Solution Approach 1:
The patent divides the circuit control into two independent modules: a first switch module for controlling charging/discharging circuits and a second switch module for controlling motor driving circuits. This segmentation allows the motor controller to independently manage each circuit function, resolving the control difficulty while maintaining circuit integration benefits.
2Use of energy by moving object
If large amount of current passes through bus capacitor during battery discharging, then energy transfer is efficient, but current through battery pack decreases and heating rate decreases severely
Solution Approach 1:
The patent introduces the bus capacitor as an intermediary energy storage component between the battery pack and the load. The capacitor absorbs current during battery discharging and releases it during motor operation, acting as a buffer that maintains high current flow through the battery pack for heating while enabling efficient energy transfer through the capacitor.
3Temperature
If battery pack is preheated rapidly, then low temperature performance is improved, but control of separate circuits becomes more difficult
Solution Approach 1:
The patent segments the control functions into dedicated switch modules: the first switch module handles charging/discharging operations for heating, while the second switch module handles motor driving. This segmentation simplifies control logic for each module, enabling rapid battery preheating without increasing overall control complexity.
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 solution allows for independent control of the motor driving and charging/discharging circuits, preventing significant current decrease through the battery pack and enhancing heating efficiency by ensuring the bus capacitor participates in the charging and discharging processes, thus improving the battery pack's temperature rise.
Implementation Method 1
a large amount of heat is generated inside and a temperature rises rapidly
Data Source
AI summary
The present disclosure relates to the technical field of vehicles, and provides a vehicle and an energy conversion device and a control method therefor. The energy conversion device includes a motor controller, a bus capacitor, a first switch module, a motor, and a second switch module. By controlling the first switch module and the second switch module to be turned on/off, a motor driving circuit can be formed by a battery pack, the first switch module, the bus capacitor, the motor controller, and the motor, and a charging and discharging circuit can be formed by the battery pack, the second switch module, the motor, the motor controller, and the bus capacitor.