Battery Cooling Modes for Parked and Driving EV Thermal Loads
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Solution Overview
Problem
Conventional battery thermal management systems for electric vehicles fail to efficiently regulate lithium-ion battery temperatures during both active vehicle operation and passive parking conditions, particularly in extreme environments, leading to excessive energy consumption and temperature fluctuations.
Innovation Solution
A multi-mode cooling system that integrates a closed-circuit and open-circuit mode using three-way valves to control air circulation, incorporating evaporative cooling and dehumidification, allowing adaptive temperature regulation based on vehicle status and ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional active cooling mechanisms are used during parked conditions, then battery temperature can be maintained, but energy consumption increases significantly
Solution Approach 1:
The system dynamically switches between open-circuit and closed-circuit modes based on vehicle operation status. During parking, it operates in open-circuit mode using evaporative cooling with minimal energy consumption. During active driving, it transitions to closed-circuit mode for more aggressive cooling when needed
Solution Approach 2:
The evaporative cooler uses water evaporation to cool the battery during parked conditions without requiring significant external energy input. The system leverages natural evaporation processes and ambient air flow to maintain battery temperature passively
2Temperature
If liquid cooling systems are used for large capacity batteries, then cooling capability is improved, but system complexity and cost increase
Solution Approach 1:
The system uses evaporative cooling with air as the cooling medium instead of liquid cooling systems. This approach simplifies the thermal management system by eliminating pumps, radiators, and complex fluid circulation infrastructure while maintaining effective cooling capability
Solution Approach 2:
The system utilizes the phase transition of water from liquid to vapor during evaporation to absorb heat from the battery. This phase change process provides efficient cooling without requiring complex mechanical systems, simply needing water supply and air flow paths
3Use of energy by moving object
If evaporative cooling is used during active driving, then energy consumption is reduced, but cooling effectiveness decreases under high heat generation
Solution Approach 1:
The system dynamically adjusts its operation mode based on real-time conditions. During active driving with high heat generation, it can switch to closed-circuit mode or enhance evaporative cooling by increasing water flow to the evaporator, balancing energy consumption with cooling effectiveness
Solution Approach 2:
The system pre-cools the battery during parked conditions using evaporative cooling before active driving begins. This preliminary cooling reduces the initial thermal load, allowing the system to operate more efficiently during subsequent driving periods
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 maintains battery temperatures within operational ranges by reducing energy consumption and water usage, enhancing battery performance and lifespan through flexible cooling strategies.
Implementation Method 1
the evaporative cooler is configured to generate a first cool air
Implementation Method 2
the dehumidifier is configured to receive the first warm air and generate a second cool air
Data Source
AI summary
A multi-mode cooling system includes a first three-way valve, an evaporative cooler, a battery pack chamber with slots for battery main bodies, a second three-way valve, a dehumidifier, and a battery tab chamber with slots for battery tabs. The system operates in closed-circuit mode during vehicle operation, where cool air from the evaporative cooler flows through the battery pack chamber, dehumidifier, and battery tab chamber before returning to the evaporative cooler, creating a closed loop with water recycling. In open-circuit mode during vehicle parking, ambient air flows through the evaporative cooler and battery pack chamber before being discharged to the environment, providing energy-efficient cooling. The system maintains battery temperatures within operational ranges during both driving and parking, featuring a water level control system that maintains constant water levels in the dehumidifier without sensors or active control, and a shared thermal structure between the dehumidifier and evaporative cooler.