Battery Cooling Control System for EV Thermal Management
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Solution Overview
Problem
Electric vehicles face challenges with battery overheating during high-capacity and high-speed charging, leading to reduced performance and extended charge times, which can cause congestion and power shortages, and existing cooling systems are inefficient and costly.
Innovation Solution
A battery cooling control system that determines the need for cooling based on charging status, real-time temperature, and state of charge, using a combined refrigerant flow path with the cabin air conditioning system to precool the battery before and during charging, optimizing cooling start times and avoiding unnecessary cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large capacity battery and high charge speed are applied, then the charging efficiency is improved, but the battery temperature rises excessively causing performance deterioration
Solution Approach 1:
The system performs preliminary cooling of the battery before charging begins by detecting charging execution information and determining cooling necessity in advance. The control device activates the cooling device during travel or stop periods before charging starts, pre-cooling the battery to prevent excessive temperature rise during high-speed charging operations.
2Temperature
If cooling is provided continuously to prevent battery overheating, then battery temperature is controlled, but system complexity and power consumption increase
Solution Approach 1:
The system dynamically adjusts cooling operations based on real-time conditions. The control device determines cooling necessity by evaluating charging execution information, battery temperature, and vehicle operation state (travel or stop). The cooling device operates only when necessary - during travel or stop periods before charging - rather than continuously, optimizing the balance between temperature control and system complexity.
Solution Approach 2:
The control device autonomously manages cooling operations by detecting charging execution information and battery temperature, determining whether cooling is necessary, and controlling the cooling device accordingly. The system serves itself by making intelligent decisions about when cooling is needed without requiring external intervention or complex manual control systems.
3Productivity
If cooling is provided continuously to maintain battery performance, then charge efficiency is maintained, but charge time is extended due to cooling overhead
Solution Approach 1:
The system performs cooling during travel or stop periods before charging begins, rather than during charging itself. By pre-cooling the battery in advance when the vehicle is traveling or stopped, the battery is ready for high-speed charging without excessive temperature rise, eliminating the need to interrupt or slow down charging for cooling purposes.
Solution Approach 2:
The cooling operation is integrated into periods when the vehicle is already traveling or stopped, making use of existing operational time. The cooling device operates during travel or stop periods, utilizing time that would otherwise be spent on non-charging activities, thereby maintaining continuous useful action without extending total charge time.
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 system efficiently controls battery temperature, extending battery life and reducing charge time while minimizing system complexity and power consumption.
Implementation Method 1
an inverter, a motor, and a plurality of batteries are stored inside one storage unit formed with a refrigerant circulation path, and the inverter, the motor, and the batteries are cooled by circulating a refrigerant in the refrigerant circulation path
Implementation Method 2
the inverter, the motor, and the plurality of batteries are cooled using an air conditioning refrigerant of the cabin air conditioning cooling system
Data Source
AI summary
There is provided a battery cooling control system capable of efficiently and effectively controlling the cooling of a battery. While an electric powered vehicle travels and/or stops, it is determined whether or not there is an indication of a battery being charged, and if it has been determined that there is the indication of charging being performed, it is determined whether or not there is a necessity for cooling the battery, and if it has been determined that there is the necessity for cooling the battery, the battery is cooled to a predetermined value during traveling. In addition, based on at least a state of charge of the battery and/or a driving range, it is determined whether or not there is an indication of charging being executed, and based on a real-time battery temperature, an increase in battery temperature caused by charging, and an upper limit value for a predetermined allowable battery temperature range, it is determined whether or not there is a necessity for cooling the battery.