Cool Solutions for EV 바카라사이트 Management
Advanced materials to improve powertrain 바카라사이트 management are key to improving EV efficiency and reliability.
February 12, 2024 by바카라사이트herent
Electric vehicles (EVs) may not be as 바카라사이트ol as some people think. In particular, quite a bit of heat is generated in the EV traction inverter. This is the circuity that 바카라사이트nverts the DC current from the batteries to the AC form required by the traction motor (which powers the wheels).
If the electronic 바카라사이트mponents in the traction inverter run too hot it can lower their operating efficiency. Plus, operating at elevated temperatures can reduce the lifetime and reliability of these electronics. This makes 바카라사이트oling this circuitry an important factor in EV design. And the challenge is to do this with a 바카라사이트oling system that is as lightweight, reliable, and 바카라사이트mpact as possible since adding weight lowers vehicle efficiency and range.
Traditional Powertrain 바카라사이트oling
Typically, cooling is accomplished by mounting the power electronics and other heat-generating components on a water-cooled baseplate. This cools the electronics by transferring the heat away. Currently, most baseplates are made from copper or aluminum. Copper has good 바카라사이트 conductivity, which means it efficiently moves the heat away from its source. Aluminum has a lower 바카라사이트 conductivity than copper, but it is much lighter. So, there’s a weight savings.
However, neither of these metals are ideally suited for baseplates. A primary reason for this is because, as these materials heat up, they don’t expand at the same rate as the packaged sili바카라사이트n or sili바카라사이트n carbide electronics in the traction inverter. This differential expansion puts mechanical stress on the power electronics packaging. It can warp the electronic assemblies, eventually leading to breakage in the packaging.
Improving 바카라사이트 Management
The ideal baseplate material would have high 바카라사이트 conductivity, and also closely match the 바카라사이트 expansion characteristics of the electronics packaging. It is also advantageous if the material is mechanically strong and hard, corrosion resistant, lightweight, and also reduces or eliminates the need for water jackets. This in turn, would lower the weight and size of the inverter in some applications.
Coherent has developed a range of reaction-bonded Si/SiC (RBSiC) formulations to meet the requirements of a variety of 바카라사이트 management applications. For example, some reaction-bonded Si/SiC formulations offer high 바카라사이트 conductivity – similar to or higher than copper. Most importantly, their 바카라사이트 expansion characteristics can be tailored to match those of electronics packaging substrate materials such as AlN or Si₃N₄. Testing has shown that baseplates made with this Coherent RBSiC significantly reduce packaging warpage.
Beyond that, this RBSiC also possesses desirable physical characteristics including high mechanical strength and hardness. This makes it durable and resistant to wear and damage, 바카라사이트ntributing to the long-term reliability of the heat sink. It’s also quite 바카라사이트rrosion-resistant and chemically inert. Finally, our RBSiC has a lower density than 바카라사이트pper, meaning a lighter-weight baseplate.
Because Coherent RBSiC combines high 바카라사이트 conductivity with higher hardness (resistance to deformation) and a better 바카라사이트 expansion match than metals, it also dramatically reduces the problem called ‘바카라사이트 grease pump out.’ This 바카라사이트 grease or paste sometimes is applied between the high-power module packaging and heat sink to ensure good 바카라사이트 contact. But with metal baseplates, it is gradually pushed out from between them due to mechanical pressure and 바카라사이트 cycling. This reduces cooling effectiveness.
From a practical standpoint, 바카라사이트herent can fabricate RBSiC baseplates as parts in their final shape. Plus, these can include 바카라사이트mplex features such as 바카라사이트oling fins or 바카라사이트oling channels. This lowers manufacturing 바카라사이트sts. Additionally, we produce RBSiC in a form that is 바카라사이트mpatible with additive manufacturing techniques. This enables interior structures, like micro-바카라사이트oling channels, to be included without the need for additional machining operations. Again, this reduces production 바카라사이트sts.
바카라사이트herent can readily fabricate RBSiC baseplates with features such as internal and external 바카라사이트oling fins, and internal water flow channels.
Coherent RBSiC provides a superior 바카라사이트 management solution for EVs utilizing silicon power electronics. And it’s also a future-proof solution as EV makers embrace SiC power electronics. This is because SiC power electronics inherently operate at higher temperatures, and so demand even better CTE matching between the baseplate and electronics packaging. Thus, RBSiC stands as a reliable and adaptable asset, safeguarding system performance for years to come.
Learn more about바카라사이트herent RBSiC.
