EV Charging Control for Battery Cooling and Cabin Air Conditioning
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Solution Overview
Problem
The challenge of balancing the time required to charge a vehicle battery and the use of an air conditioning device without impairing vehicle convenience, particularly during rapid charging when the battery generates excessive heat and the air conditioning device competes for cooling resources.
Innovation Solution
A vehicle system that includes a battery, a cooling device with a heat exchange unit to distribute cooling capacity between battery cooling and air conditioning, and a control device that manages battery charging and air conditioning use, proposing restrictions and adjusting destination arrival times based on user input and weather information to optimize charging efficiency and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the air conditioning device operates during battery charging, then the comfort of the vehicle cabin is maintained, but the battery cooling performance is restricted and charging time increases
Solution Approach 1:
The system dynamically adjusts the operation state of the air conditioning device based on real-time battery temperature and charging progress. The control device can switch between different operating modes (full operation, restricted operation, or shutdown) to balance comfort and charging efficiency, making the system adaptable rather than static
Solution Approach 2:
The control device predicts the battery temperature rise during charging in advance and proactively restricts or shuts down the air conditioning device before the temperature becomes critical. This preliminary action prevents the contradiction from fully manifesting by preparing the system state ahead of time
2Ease of operation
If the air conditioning device operates during rapid charging, then the vehicle cabin remains comfortable, but the battery generates excessive heat and safety is compromised
Solution Approach 1:
The system applies preliminary anti-action by restricting the air conditioning device before the battery temperature reaches dangerous levels. The control device monitors charging current and battery temperature in real-time, and proactively reduces air conditioning operation to prevent excessive heat generation during rapid charging
Solution Approach 2:
The control device continuously monitors battery temperature and charging current, and uses this feedback to dynamically adjust the air conditioning device operation. When battery temperature approaches critical thresholds during rapid charging, the system automatically restricts or shuts down the air conditioning to maintain safety
3Adaptability or versatility
If the cooling capacity is shared between battery cooling and air conditioning, then both functions can operate simultaneously, but the cooling performance of each function is restricted
Solution Approach 1:
The system dynamically allocates cooling capacity between battery cooling and air conditioning based on real-time requirements. The control device adjusts the refrigerant flow distribution and compressor output to match the urgent cooling demands, ensuring optimal cooling performance for the higher-priority function at any given moment
Solution Approach 2:
The cooling system is segmented into separate controllable circuits for battery cooling and air conditioning, with independent flow control valves and heat exchangers. This segmentation allows the system to independently regulate cooling capacity to each function, enabling flexible allocation rather than forced sharing
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
Effectively balances battery charging time and air conditioning use by restricting air conditioning during critical charging periods, allowing users to prioritize comfort or speed based on their preferences, thereby enhancing overall vehicle convenience and efficiency.
Implementation Method 1
a heat exchange unit configured to exchange heat between a refrigerant of the battery cooling device and a refrigerant of the air conditioning device
Data Source
AI summary
A control device notifies a destination arrival time based on a required charging time in a state where the air conditioning device is operated when charging is included in a scheduled travel plan. Before the charging is executed, the control device makes a proposal for permission to restrict use of the air conditioning device during the charging. When the proposal is approved, the control device changes the destination arrival time based on a required charging time in a state where the use of the air conditioning device is restricted, and notifies the destination arrival time.