EV Battery Thermal Loop Filtration for Cross-Loop Contamination
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Solution Overview
Problem
Integrated thermal management systems for electric vehicles face contamination issues due to debris from one loop potentially contaminating another, especially in the narrow cooling channels of heat exchanger fins, which can affect the efficiency and longevity of battery thermal management.
Innovation Solution
A thermal management system with a filter located upstream of the battery thermal loop to filter debris from the motor and cabin loops, utilizing a high-pressure bypass filter with a filtration efficiency of 90% for a specific particle size and heat exchanger fins with restrictive flow passages for effective contamination protection, evaluated using ISO 16889 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is added upstream of the battery thermal loop to prevent contamination, then the reliability and cleanliness of the battery thermal management system is improved, but the device complexity and cost increase
Solution Approach 1:
The filter is positioned upstream of the battery thermal loop to perform preliminary filtration of coolant before it enters the battery heat exchanger. This preliminary action prevents contamination from reaching the narrow cooling channels, addressing the reliability concern while maintaining system integrity.
Solution Approach 2:
The thermal management system is segmented into multiple independent loops (battery loop, motor loop, cabin loop) with the filter strategically placed at the boundary. This segmentation allows the filter to protect the battery loop specifically without requiring complete system redesign, balancing complexity and reliability.
2Reliability
If the heat exchanger fins have restrictive flow passages for effective filtration, then the filtration efficiency is improved, but the heat transfer efficiency and coolant flow rate may deteriorate
Solution Approach 1:
The restrictive flow passages are implemented locally in the heat exchanger fins where filtration is most needed, rather than throughout the entire thermal management system. This localized approach provides effective filtration at the battery heat exchanger while maintaining adequate flow rates in other system components.
Solution Approach 2:
The filter acts as an intermediary component between the coolant source and the battery heat exchanger. It performs the filtration function that the restrictive passages would otherwise need to provide, allowing the heat exchanger fins to maintain their heat transfer optimization while still achieving effective contamination prevention.
3Adaptability or versatility
If multiple thermal circuits are integrated for thermal control of battery and vehicle systems, then the system versatility and thermal efficiency are improved, but the risk of cross-contamination between loops increases
Solution Approach 1:
The thermal management system is divided into separate thermal circuits (battery loop, motor loop, cabin loop) that are physically segmented but thermally connected where needed. This segmentation prevents cross-contamination while maintaining the versatility of integrated thermal management through strategic fluid communication between loops.
Solution Approach 2:
The filter serves as an intermediary barrier between different thermal loops, allowing thermal efficiency to be improved through integrated circuits while preventing harmful cross-contamination. The filter enables the system to achieve both versatility and protection from harmful factors.
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 prevents contamination of the battery thermal loop, maintaining the cleanliness of the coolant and heat exchanger fins, thereby ensuring efficient thermal regulation and extending the battery's useful life and electric range.
Implementation Method 1
A filter is located upstream of the battery thermal loop to filter debris from the motor and cabin loops
Implementation Method 2
A plurality of heat exchanger fins are located between each of the battery cells to provide a liquid coolant to regulate the battery temperature
Implementation Method 3
The heat exchanger fins provide a liquid coolant to regulate each of the battery cell temperatures
Data Source
AI summary
A thermal management system for an electric vehicle is provided. The thermal management system includes a thermal circuit for regulating a battery temperature. A filter is located upstream of the battery for filtering liquid coolant. The thermal management system also includes a second thermal circuit in fluid communication with the battery thermal circuit. The second thermal circuit provides thermal control to a vehicle system other than the battery. The battery thermal circuit includes a plurality of battery cells. Pluralities of heat exchanger fins are located between each of the battery cells to provide the coolant to regulate the battery temperature. The filter has a filtration transfer function based on a filter characteristic of the fins.