According to foreign media reports, British M & I Materials, Warwick University School of Manufacturing Engineering (WMG) and Ricardo Consulting have jointly launched the i-CoBat project, which aims to develop and demonstrate new electric vehicle battery cooling technology, using M & I Materials ’degradable media Coolant MIVOLT, test the concept of immersion cooling battery pack.
As the automotive industry transitions to electrification, the high-capacity batteries used in electric vehicles face major challenges in thermal management. The operating temperature range of the battery is narrow. Once the temperature is exceeded, the performance and efficiency of the battery will decrease, and accelerated aging. In extreme cases, exceeding the upper operating limit may cause thermal runaway of the battery, catastrophic failure, and fire.
During fast charging, the heat generated by the battery is three times that of normal driving and charging. At present, electric vehicle battery packs usually use air cooling, or use water / glycol for cold plate cooling or use refrigerants. Using these thermal management systems will limit the charging speed and the number of fast charging. In order to increase the driving range, one possible solution is to increase the size of the battery pack, but this will significantly increase the cost.
The i-CoBat project, led by M & I Materials, is part of the British Government ’s Faraday Battery Challenge, which encourages the development of the latest electric vehicle battery technology. In the i-CoBat project, the researchers used M & I Materials' degradable medium coolant MIVOLT, whose chemical properties can make it a medium coolant and directly remove the heat from the surface of the cell. This is because MIVOLT dielectric liquid is not conductive and can directly contact the battery pack. Using MIVOLT for liquid immersion cooling, heat conduction can be started from the heat source, and no secondary indirect cooling system is needed, thus providing a simpler thermal management solution.
This innovation is expected to improve power output and battery life, speed up charging, and at the same time reduce costs and effectively solve the problem of mileage anxiety. David Greenwood, professor of advanced drive systems at the School of Manufacturing Engineering at Warwick University, said: "This is not just a matter of keeping the battery cool, but also optimizing the operating temperature."
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