Intermittent Battery Temperature Control for EV External Charging
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Solution Overview
Problem
The service life of on-vehicle air conditioners is shortened when used for continuous battery cooling during external charging of electric vehicles, and extreme temperatures can lead to suboptimal battery performance.
Innovation Solution
A temperature control system that operates the on-vehicle air conditioner in an intermittent mode to manage battery temperature during external charging, using a controller to balance charging and temperature control, thereby extending the air conditioner's service life and maintaining battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the on-vehicle air conditioner is continuously operated to cool the battery during external charging, then the battery temperature is maintained at optimal levels, but the service life of the air conditioner is significantly shortened
Solution Approach 1:
The controller operates the air conditioner in an intermittent periodic manner during external charging, alternating between operation and standby states. This periodic operation maintains battery temperature within acceptable ranges while significantly reducing cumulative operating time, thereby extending the service life of the air conditioner components.
Solution Approach 2:
Instead of continuous operation, the air conditioner is operated partially during external charging. The controller determines appropriate operation intervals and durations based on battery temperature requirements, providing sufficient cooling only when necessary while avoiding excessive operation that would shorten component life.
2Temperature
If the on-vehicle air conditioner is continuously operated to heat the battery during external charging at low ambient temperatures, then the battery achieves desired input and output characteristics, but the service life of the air conditioner is significantly shortened
Solution Approach 1:
The controller operates the air conditioner in an intermittent periodic manner during external charging, alternating between operation and standby states. This periodic operation maintains battery temperature within acceptable ranges while significantly reducing cumulative operating time, thereby extending the service life of the air conditioner components.
Solution Approach 2:
Instead of continuous operation, the air conditioner is operated partially during external charging. The controller determines appropriate operation intervals and durations based on battery temperature requirements, providing sufficient heating only when necessary while avoiding excessive operation that would shorten component life.
3Reliability
If the on-vehicle air conditioner operates intermittently during external charging, then the service life of the air conditioner is extended, but continuous temperature control may be compromised
Solution Approach 1:
The controller continuously monitors battery temperature and uses this feedback to determine when to operate or stand by the air conditioner. This feedback-based control ensures that temperature stability requirements are met while optimizing operation intervals to extend air conditioner service life.
Solution Approach 2:
The air conditioner operation schedule is dynamically adjusted based on real-time battery temperature conditions, ambient temperature, and charging status. This dynamic control allows the system to maintain temperature stability when needed while reducing operation time to extend service life.
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 intermittent operation mode extends the service life of the on-vehicle air conditioner and ensures optimal battery temperature, maintaining performance and reliability during external charging without significantly reducing the air conditioner's lifespan.
Implementation Method 1
a heat exchanger is housed in the battery case, and the heat exchanger is connected to a heat exchange medium passage that connects the evaporator for cooling the vehicle interior with the compressor
Data Source
AI summary
A temperature control system includes an on-vehicle battery, on-vehicle air conditioner, and a controller. The on-vehicle battery is charged using an external power supply located outside of the vehicle. The on-vehicle air conditioner controls the temperature of the vehicle interior and the temperature of the on-vehicle battery. The controller operates the on-vehicle air conditioner in an intermittent operation mode so as to control the temperature of the on-vehicle battery, when the on-vehicle battery is charged using the external power supply.