Phase Change Material For Battery Cooling

A phase change material pcm is a substance which releases absorbs sufficient energy at phase transition to provide useful heat cooling.

Phase change material for battery cooling. Battery thermal management phase change material battery thermal characteristics active cooling 1. However in a non phase change encapsulated thermal battery the temperature of the substance is changed without inducing a phase change. In this study passive cooling systems were constructed with a heat pipe and phase change material pcm and their performances were investigated with battery simulators. Introduction with high energy high power density and long lifespan features lithium ion batteries are widely adopted as the traction battery for battery electric bev fuel cell electric fcev and plug in hybrid phev electric.

But because of the heavy weight the system need to be optimized with a balance of the cooling capacity contributed by the active and passive cooling. An encapsulated thermal battery is physically similar to a phase change thermal battery in that it is a confined amount of physical material which is thermally heated or cooled to store or extract energy. A pcm is a substance that is good at absorbing large amounts of heat energy while melting from solid to liquid and then releasing the energy while freezing back into a solid. Different from previous work this design integrates phase change material heat pipe and spray cooling and can offer both heating and cooling services on demand for lithium ion battery.

The idea proposed by the authors was to analyze different pccs in terms of thermal performances. The hybrid system that integrates active cooling into phase change materials pcms expanded graphite eg shows great prospects for power battery thermal management. The phase transition may also be between non classical states of matter such as the conformity of crystals where the material goes. Thermal energy storage can be used to increase the cooling capacity of the power plant during these hot days while using the cold air at night to recharge the phase change material.

The chicago based firm allcell technologies thinks it may have a better solution. 14 was a small battery system build by schweitzer and al hallaj utilizing phase change component pcc material to surround commercial cylindrical 18 650 lithium ion cells. Despite being an advanced battery thermal management btm strategy the phase change material pcm cooling technology still suffers from the low thermal stability of the pcms in practical applications which leads to the leakage of the phase change ingredient shape change or even collapse concerns under high temperature. Generally the transition will be from one of the first two fundamental states of matter solid and liquid to the other.

The aim was to determine the effectiveness of the cooling system and to identify the optimal pcm beeswax or rubitherm rt 44 hc for a temperature range of 25 55 c.