Battery Self-Heating Control Using Inverter Feedback to Prevent Sintering
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Solution Overview
Problem
Existing battery heating systems in electric vehicles fail to accurately control the self-heating process, leading to potential sintering issues and affecting the vehicle's performance and user experience.
Innovation Solution
A control method for a battery self-heating system that involves obtaining temperature information to determine if heating is required, controlling a switch module based on voltage or current information to enable or prohibit self-heating, and using a three-phase inverter to adjust the heating current's amplitude and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is heated in a cold environment to ensure normal operation, then the battery can charge and discharge normally, but inaccurate control of the self-heating process may cause sintering of switchgear
Solution Approach 1:
The control method continuously monitors temperature information of the battery pack and uses this feedback to dynamically adjust the self-heating control. The controller determines whether self-heating is needed based on real-time temperature data, and adjusts the switch module accordingly to prevent both overheating and sintering, ensuring reliable battery operation in cold environments.
Solution Approach 2:
The control method changes the working parameters of the battery by controlling the amplitude and frequency of the heating current through the three-phase inverter. By adjusting these parameters based on temperature feedback, the system achieves accurate temperature control that prevents switchgear sintering while ensuring normal battery operation.
2Productivity
If the switch module is controlled to close to enable self-heating, then heating efficiency improves, but risk of sintering increases without accurate control
Solution Approach 1:
The system uses temperature feedback to control the switch module's closing and opening. The controller monitors battery temperature and only closes the switch module when heating is actually needed, preventing unnecessary heating that could lead to sintering while maintaining high heating efficiency when required.
Solution Approach 2:
The control method implements periodic monitoring of temperature information and periodic adjustment of the switch module state. This periodic control ensures the switch module is closed only during periods when heating is needed and opened when temperature targets are reached, balancing heating efficiency with switchgear protection.
3Productivity
If the three-phase inverter adjusts heating current amplitude and frequency for self-heating, then charging and discharging efficiency improves, but control complexity increases
Solution Approach 1:
The three-phase inverter is designed to perform multiple functions: it can adjust both the amplitude and frequency of the heating current for optimized self-heating, while also serving as the power conversion device for the motor. This multi-functionality improves charging and discharging efficiency without requiring separate dedicated heating equipment, though control complexity increases.
Solution Approach 2:
The control system changes multiple parameters (amplitude and frequency) of the heating current to optimize self-heating performance. By dynamically adjusting these parameters based on temperature feedback, the system achieves improved charging and discharging efficiency while managing control complexity through systematic parameter management.
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
Ensures accurate battery self-heating operations, improving charging and discharging efficiency while preventing sintering issues.
Implementation Method 1
the three-phase inverter is controlled to enable/configure the first battery body and the second battery body to alternately charge and discharge, to achieve self-heating of the battery pack
Data Source
AI summary
A control method for a battery self-heating system including a three-phase motor, a battery pack, a three-phase inverter, and a switch circuit, includes: acquiring battery pack temperature information; when determined that the battery pack requires self-heating according to the battery pack temperature information, obtaining voltage information between a first end and a second end of the switch circuit; according to the voltage information between the first end and the second end of the switch circuit, controlling the switch circuit for self-heating of the battery pack; when it is determined that the battery pack does not require self-heating according to the battery pack temperature information, obtaining electric current information between the first end and the second end of the switch circuit; and according to the electric current information between the first end and the second end of the switch circuit, controlling the switch circuit to stop self-heating of the battery pack.