Battery Pack Heating Control via Motor Controller Feedback
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Solution Overview
Problem
Existing battery pack heating systems have low control accuracy due to the periodic on/off switching method used to heat batteries in low temperature environments, which can lead to inefficient heating and potential damage.
Innovation Solution
A control system and method for a battery pack heating system that includes a battery management system, a motor controller, and a vehicle controller, which cooperate to acquire state parameters, send heating requests, and control the inverter's switch modules to periodically charge and discharge the battery pack, improving control accuracy and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic on/off switching method is used to heat battery pack, then heating function is achieved, but control accuracy is low
Solution Approach 1:
The patent implements a feedback control mechanism where the control system continuously monitors the battery pack temperature and adjusts the heating control signal accordingly. The processor receives temperature information from detectors and dynamically modifies the switching control of bridge arm modules to maintain precise temperature control, resolving the low control accuracy issue of conventional periodic switching methods.
Solution Approach 2:
The patent transitions from static periodic switching to dynamic control by making the heating parameters adaptive. The control system dynamically adjusts switching frequency, duty cycle, and heating power based on real-time battery temperature, state of charge, and thermal conditions, enabling precise control while maintaining system simplicity through algorithmic optimization.
2Productivity
If alternating current is used to heat battery pack internally, then heating efficiency is improved, but risk of over-temperature and damage increases
Solution Approach 1:
The control system employs multiple temperature detectors positioned at different locations within the battery pack to continuously monitor thermal conditions. This feedback mechanism enables real-time detection of temperature anomalies and triggers protective actions such as reducing heating power or shutting down heating when over-temperature conditions are detected, thereby preventing thermal damage while maintaining efficient heating operation.
Solution Approach 2:
The patent implements protective measures in advance by setting predetermined temperature thresholds and safety margins. The control system prepares protective protocols before overheating occurs, including gradual power reduction strategies and emergency shutdown mechanisms, cushioning against potential thermal damage while allowing efficient heating to proceed within safe boundaries.
3Measurement precision
If motor controller is used to control inverter switch modules, then control precision is improved, but system complexity increases
Solution Approach 1:
The patent makes the motor controller perform multiple functions: it controls the inverter switch modules for heating operations, manages motor drive functions, and coordinates with the battery management system. By making the motor controller universal and multi-functional, the system achieves precise switching control without adding dedicated heating controllers, thereby improving control precision while avoiding increased overall system complexity.
Solution Approach 2:
The control functions for heating and motor operations are merged into a single motor controller unit. This consolidation integrates the switching control precision of motor control with heating management, reducing the number of separate controllers needed while maintaining high precision through unified control architecture and shared processing resources.
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 effectively heats the battery pack with improved control accuracy, ensuring safe operation and extending the battery's lifespan by precisely managing the heating process based on state parameters and preventing over-temperature conditions.
Implementation Method 1
control a target upper bridge arm switch module and a target lower bridge arm switch module to be periodically turned on or off, so as to heat the battery pack
Data Source
AI summary
The application provides a control system and method for a battery pack heating system. The control system includes: a battery management system configured to acquire a state parameter of a battery pack, and send heating request information to a vehicle controller when determining the state parameter of the battery pack meets a preset heating condition; a motor controller configured to send, to the vehicle controller, feedback information indicating that a motor of the battery pack heating system is in a non-operating state, when determining the motor is in the non-operating state, and control, in response to a first control signal, a target upper bridge arm switch module and a target lower bridge arm switch module to be periodically turned on or off; and the vehicle controller configured to send the first control signal to the motor controller in response to the heating request information and the feedback information.