Tech Features

The EVSE GMI circuit: Should the standards be changed?

Leviton’s Director of Engineering explains the EVSE GMI circuit and why he believes the standards should be changed. One of the many safety features integrated into EVSE is the ground monitor interrupter (GMI) circuit. The GMI circuit ensures that the ground path is connected from the vehicle chassis all the way to the electric service… Read more »

AutoLion Li-ion battery simulation software claims a unique modeling technology

Super modeling: EC Power’s AutoLion claims unique technology, reliable results and extraordinary savings in development time and cost With battery technology being one of the key bottlenecks slowing down the widespread adoption of electric vehicles, Pennsylvania’s growing startup EC Power proposes a tantalizing offer to battery developers: cut your product development cycle by around 20 percent, and… Read more »

Pushing the power limits: Fuji Electric on the new requirements of power electronics

With each passing model year, the requirements demanded of automotive power electronics increase. Market forces are pushing Insulated Gate Bipolar Transistor (IGBT) modules towards lighter, smaller, more powerful and more reliable technology. These switching devices are what power an EV or hybrid inverter, and with increasingly stringent emissions requirements, automakers are looking for more innovative… Read more »

Voltabox begins building Li-ion battery packs in Texas

Three Li-ion battery chemistries, the speed of its software and hardware systems configuration and the automotive legacy of Voltabox make this newly-landed American spin-off company a player in the realm of rechargeable batteries for public transit and heavy industrial vehicles. Austin, Texas is known for many things: music festivals, barbequed ribs, the Texas Longhorns, filmmaker… Read more »

Next-gen battery pack testing: AeroVironment launches the AV-900 EX

In the late 1980s, General Motors contracted with the California-based firm AeroVironment to develop the Impact electric concept car. It was the prototype that evolved into the infamous EV1 production car. While designing the Impact, AeroVironment needed the ability to test large-format battery packs for automotive applications. However, at that time, essentially no one else… Read more »

Simulation of battery pack cooling systems: measure twice, cut once

The experts at Mentor Graphics walk us through the simulation and analysis of a battery pack cooling system. In the business of battery pack design, one of the main considerations is cooling. The pack must have a uniform and stable temperature for the batteries to perform adequately during worst-case conditions. Even within a single cell,… Read more »

Freudenberg Group’s new line of Li-ion battery separators

The separator is a critical component of a battery. It provides a barrier between the anode and the cathode while enabling the exchange of ionic charge carriers from one side to the other. For over 40 years, the Freudenberg Group has been producing separators for nickel-based batteries, such as the nickel-metal hydride (NiMH) cells widely… Read more »

Membrane technology and the importance of venting EV electronics

Protecting a car’s sensitive electronics throughout its lifetime is a must, whether it’s a conventional ICE vehicle or an EV. However, the larger electronics in plug-in vehicles have more power, more heat and higher pressure differentials that present new technological challenges to OEMs and suppliers. Any power semiconductor inevitably generates heat while conducting current, due… Read more »

Impregnating motors with thermal management materials to reduce hot spots

A doctoral candidate plucks a thermal management material out of LORD Corporation’s voluminous catalog, and one Ph.D. later, the EV world may have an exciting new boon for the efficiency of electric motors. Anyone working within the corporate world has probably been battered with the word “synergy” to the point of it being rendered meaningless…. Read more »

A closer look at how batteries fail

A lot of research has been done to improve lithium-ion battery safety, cycle life and power output over a range of high and low temperatures, yet understanding the fundamental processes and degradation mechanisms in Li-ion batteries remains a challenge. To understand the degradation processes of lithium-ion batteries, it is important to understand how they operate…. Read more »