Electric Vehicle Battery Heating Circuit Isolation Switch
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Solution Overview
Problem
The existing electric vehicle running control systems face issues where the heating circuit interferes with the load capacitor, causing voltage fluctuations and preventing the heating circuit from functioning normally, especially in low temperature environments.
Innovation Solution
The system incorporates a switchgear and switch control module that disconnects the in-vehicle battery from the load capacitor when the heating circuit is active, allowing the heating circuit and load capacitor to operate independently, using a bidirectional switchgear and heating circuit control module to manage energy flow and polarity reversal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the heating circuit and load capacitor work simultaneously to provide heating and power supply, then the battery can maintain temperature and supply power, but the voltage fluctuates violently and the heating circuit cannot work normally
Solution Approach 1:
The patent divides the circuit into two independent operational modes using switch control: (1) heating mode where the heating circuit connects to the battery while the load capacitor disconnects, and (2) power supply mode where the load capacitor connects to the battery while the heating circuit disconnects. This segmentation eliminates the interference between heating and power supply functions that caused voltage fluctuations, while maintaining both functions through time-division multiplexing.
2Temperature
If the heating circuit is connected to the in-vehicle battery to heat the battery in low temperature, then the charging and discharging performance is improved, but the voltage fluctuates and the heating circuit may not work normally due to load capacitor interference
Solution Approach 1:
The patent uses a control module to detect battery temperature in advance and switch the circuit to heating mode before the battery temperature becomes critically low. The control module monitors battery parameters and proactively activates the heating circuit while disconnecting the load capacitor, preventing voltage fluctuations from occurring in the first place rather than reacting after problems arise.
3Stability of the object's composition
If the switchgear is controlled to disconnect the heating circuit from the load capacitor during heating, then the voltage stability is improved, but the circuit complexity increases
Solution Approach 1:
The patent employs a bidirectional switchgear that can operate in multiple modes: connecting the heating circuit to the battery, connecting the load capacitor to the battery, or disconnecting both. This universal switch component consolidates what would otherwise require multiple separate switches, reducing overall circuit complexity while achieving the necessary isolation between heating and power supply functions for voltage stability.
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 configuration prevents interference between the heating circuit and load capacitor, ensuring stable voltage and efficient battery heating, thereby prolonging battery life and maintaining performance in low temperature conditions.
Implementation Method 1
By controlling an energy to flow between the in-vehicle battery E and the heating circuit F so as to heat a damping element in the heating circuit F, the in-vehicle battery E is heated
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
An electric vehicle running control system is provided. The electric vehicle running control system comprises: a heating circuit (11); a load capacitor (C12); a switchgear (20) connected with the heating circuit (11) and the load capacitor (C12) respectively; and a switch control module (200) connected with the switchgear (20) for controlling the switchgear (20) to switch off when the heating circuit (11) is connected with an in-vehicle battery (5) to form a heating loop for heating the in-vehicle battery (5).