facebook  twitter  linkedin  pinterest  tumblr
中文    ENGLISH
Service Hotline
+86-13510974563
Tel:86-755-28772795
Email: sales@halnziye.com
搜索
Search
About Us
联系我们
Check category
/
/
/
Innovations in thermal management systems for Electric Vehicles

Innovations in thermal management systems for Electric Vehicles

  • Categories:Events
  • Author:Tufan Mukhopadhyay
  • Origin:Internet
  • Time of issue:2020-06-28 15:08
  • Views:

(Summary description)Thermal Management of Electric Vehicle

Innovations in thermal management systems for Electric Vehicles

(Summary description)Thermal Management of Electric Vehicle

  • Categories:Events
  • Author:Tufan Mukhopadhyay
  • Origin:Internet
  • Time of issue:2020-06-28 15:08
  • Views:
Information
Electric vehicles (EVs) are rapidly emerging as a central part of a future greener and more economical transportation ecosystem. The  benefits of EVs include emission-free driving, cheaper maintenance, and enhanced energy security.
 
Today, EVs use large packs of Li-ion batteries due to their reasonable energy density, power density, and efficiency metrics. During the battery charge/discharge process, current flows within the cells; and depending on the internal resistance, different levels of heat can be generated (especially during rapid charging or extreme driving conditions). Although there is a significant development in the range per charge (up to 180 miles in 15 minutes in the Tesla Model 3), recharging the battery pack could take several hours to replenish fully.
 
Moreover, Li-ion batteries require an optimum temperature to perform efficiently without any internal and external thermal instability. Temperatures less than 5°C or more than 50°C can lead to significant battery degradation and thermal runaway. A publication in Energy Reports stated that the best operating temperature for Li-ion batteries is 25-40°C, with an internal temperature difference within 5°C. Therefore, a proper battery thermal management system (BTMS) is crucial.

Current innovations in liquid cooling systems:

Liquid coolants are typically mixtures of water and petroleum-based products (such as propylene glycol), which have higher heat capacity, low freezing points, and better thermal conductivity. Notably, extensive research on the direction of cooling with liquid coolant showed that tab cooling is more efficient and can extend the battery life by three times that of surface cooling. However, the engineering of tab cooling is complex.

The liquid cooling system can be direct or indirect. Indirect liquid cooling typically involves circulating a water-glycol mixture through tubing around the battery pack. Several current models (such as Tesla, Chevy Volt, BMW i-3 and i-8, Jaguar I-pace) use this system. The Tesla Model 3 uses a machine assembled tubing (also called “bandolero”), which has significant improvements over the previous models. Audi e-tron has a more sophisticated cooling system for maintaining an optimum battery temperature and cooling the motor parts. It uses 5.8 gallons of coolant circulating through a 40 meter tube in combination with a typical heat pump. The Chevy volt cooling system comprises rectangular aluminum cooling plates (containing coolant paths), which are stacked between the battery packs as shown in the animation below.

 

In the direct cooling system, the battery is in direct contact with the liquid coolant. Therefore, the coolant must be nonconducting to prevent any electrical hazard from the cell current flow. Although there are no EVs on the market that use the direct cooling system, innovative approaches are emerging rapidly with practical testing. XING Mobility has launched an immersion cooling technology by sinking the battery pack into a nonconducting liquid that has a high boiling point (3M Novec 7200 engineered fluid). Additionally, their research team is developing modular battery systems for different manufacturers.

Scan the QR code to read on your phone

+86-755-28772795
Add: 3-4/F Bld.D Hehengxing Sci&Tech Park,No.19 Minqing Road,Longhua
District,Shenzhen China
Fax:+86-755-28772796
Email:sales@halnziye.com

Copyright© Shenzhen Halnziye Electronics Co.,Ltd 粤ICP备09218394号 深圳市市场监督管理局企业主体身份公示 Powered by www.300.cn