18650 3500mah battery

　　UK researches 18650 3500mah battery cooling technology to reduce battery fire risk

　　According to foreign media reports, the British company M&IMaterials, the School of Manufacturing Engineering (WMG) at the University of Warwick and Ricardo Consulting have jointly launched the i-CoBat project, aiming to develop and demonstrate new electric vehicle battery cooling technology, using M&IMaterials’ degradable dielectric coolant MIVOLT, testing immersion-cooled battery pack concept.

　　As the automotive industry transitions to electrification, the high-capacity batteries used in electric vehicles face major thermal management challenges. The operating temperature range of the battery is narrow. Once the limited temperature is exceeded, the performance and efficiency of the battery will decrease and the aging will be accelerated. In extreme cases, exceeding the operating upper limit may cause thermal runaway of the battery, resulting in catastrophic failure and possible fire.

　　During fast charging, the battery generates three times more heat than during normal driving and charging. Currently, electric vehicle battery packs usually use air cooling, or use water/glycol cold plate cooling or use refrigerants. Using these thermal management systems will limit the charging speed and number of fast charges. In order to improve the driving range, one possible way is to increase the size of the battery pack, but this will significantly increase the cost.

　　The i-CoBat project is led by M&I Materials and is part of the UK Government’s Faraday Battery Challenge, which encourages the development of the latest electric vehicle battery technology. In the i-CoBat project, researchers used MIVOLT, a biodegradable dielectric coolant from M&IMaterials, whose chemical properties allow it to act as a dielectric coolant, directly removing heat from the surface of the battery core. This is because the MIVOLT dielectric liquid is not conductive and can come into direct contact with the battery pack. Using MIVOLT for liquid immersion cooling enables heat conduction from the heat source, eliminating the need for a secondary indirect cooling system, thus providing a simpler thermal management solution.

　　This innovation is expected to increase power output and battery life, speed up charging, while reducing costs, and effectively solve the problem of range anxiety. David Greenwood, Professor of Advanced Drive Systems at the University of Warwick's School of Manufacturing Engineering, said: "It's not just a matter of keeping the battery cool, but optimizing the operating temperature."

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